University of Pune, Online Examination System, Question Bank

Course

Id

Question If u=2yz+t2 ,v=x

2z-t,w=xy

2,find the acceleration along axat

point(2,1,2) direction at time t=1sec

A 30 m/s2

B 28.5 m/s2

C 15 m/s2

D 20.5 m/s2

Answer A

Marks 2

Unit IIID3

Id

Question Flow is represented by the stream function Ψ =xy. the velocity

components u and v are------and flow is --------

A U=x2,v=y

2 and rotational

B u=x, v=-y and flow is irrotational

C u=x, v=-y and flow is rotational

D none of these

Answer B

Marks 2

Unit IIID3

Id

Question The magnitude of the component of velocity at a point (1,1) for a

stream function ψ=x2-y2 is equal to

A 2

B 2√2

C 4

D 4√2

Answer B

Marks 2

Unit IIID3

Id

Question In a two dimensional incompressible steady flow around an airfoil

, the stream lines are 2cm apart at a great distance from the airfoil

, where the velocity is 30m/s . The velocity near the airfoil , where

the stream lines are 1.5cm apart , is

A 22.5 m/s

B 33 m/s

C 40 m/s

D 90 m/s

Answer C

Marks 2

Unit IIID3

Id

Question Stream function y = uy –vx represents

A free vortex motion

B uniform flow parallel to x axis

C uniform flow parallel to y axis

D uniform flow inclined to x axis

Answer D

Marks 2

Unit IIID3

Id

Question The circulation ſ around a circle of radius 2 units for the velocity

field u = 2x +3y and v = -2y is

A -6π units

B -12π units

C -18π units

D -24π units

Answer B

Marks 2

Unit IIID3

Id

Question The x component of velocity in a two dimensional incompressible

flow is given by u= 1.5x . At the point (x,y) =(1,0) , the y

component of velocity v=0 . The equation for the y component of

velocity is

A v=0

B v = 1.5y

C v= -1.5x

D v= -1.5 y

Answer D

Marks 2

Unit IIID3

Id

Question Given the x- component of the velocity u= 6xy-2x2 , the y-

component of the flow v is given by, so that the flow is

continuous.

A 6y2-4xy

B -6xy +2x2

C 5x2-2xy

D 4xy -3y2

Answer D

Marks 2

Unit IIID3

Id

Question Flow net is drawn for a two dimensional boundary. The velocity

of uniform flow at approach is 1.2m/s. The size of the square is

1.2cm side. The size of the square at another location in the

stream tube is 0.5cm. The velocity at this point is

A 1.44 m/s

B 2.4 m/s

C 2.88 m/s

D 3.4 m/s

Answer C

Marks 2

Unit IIID3

Id

Question The mean velocities at two ends of a stream tube 10cm apart are

2.5m/s and 3 m/s. The convectional tangential acceleration mid

way is

A zero

B 0.5 m/s2

C 13.75 m/s2

D not determinable

Answer C

Marks 2

Unit IIID3

Id

Question A velocity field is given as V= 2yi + 3x j where x and y are in

metres . The acceleration of the fluid particle at (x,y) = (1,1) in

the x direction is

A 0 m/s2

B 5. 0 m/s2

C 6. 0 m/s2

D 8.48 m/s2

Answer C

Marks 2

Unit IIID3

Id

Question A velocity field with no components in the y and z direction is

given by V= 6+2xy +t2. the acceleration along the x- direction at

a point (3,1,2) at time t=2 , is

A 8 units

B 16 units

C 20 units

D 36 units

Answer C

Marks 2

Unit IIID3 CHECK

Id

Question The velocity in m/s at a point in a two –dimensional flows is

given as V =2i+3j . The equation of the stream line passing

through the point is

A 3dx-2dy =0

B 2x+3y =0

C 3dx +2dy =0

D xy =6

Answer A

Marks 2

Unit IIIB/D3

Id

Question 3Consider the following statements

1 In a source , equipotential lines are circles

2.Flow net is a representation of 2 dimensional Irrotational flow

of incompressible fluid.

3 Boundaries act as a limiting equipotential lines in a flow net

4 In a uniform flow region, streamlines will be parallel and

equidistant. Of these statements

A 1,2 and 3 are correct

B 1,2 and 4 are correct

C 2,3 and 4 are correct

D 1,3 and 4 are correct

Answer B

Marks 2

Unit IIID3

Id

Question A stream function is given by ψ = 2x2y+ (x+1)y2 . The flow

rate across a line joining points A(3,0) and B(0,2)

A 0.4 units

B 1.1 units

C 4 units

D 5 units

Answer C

Marks 2

Unit IIID3 CHECK

Id

Question A steady three dimensional flow field is described by a velocity

vector as V = (2x2 +3y)I + (-2xy + 3y3 + 3yz)j + (-3z2/2 – 2xz

+9y2z)k . Magnitude of velocity at point (1,-2,1) is equal to

A 2.5 m/s

B 41.8

C 62.5

D 1784.25

Answer B

Marks 2

Unit IIID3 check

Id

Questio

n

Which one of the following velocity fields represents a possible

fluid flow?

A u = x; v = y

B u = xy; v = x2y

2

C u = x; v = - y

D u = x2; v= y

2

Answer C

Marks 2

Unit IIID3CHECK FOR REPEAT

Id

Question Velocity field in fluid V = 4x3i - 10 x

2y j + 2 tk. The acceleration

component in x-direction at (1, 1, 1) and t = 3 sec is,

A 78m/s2

B 98m/s2

C 28m/s2

D 48m/s2

Answer D

Marks 2

Unit IIID3

Id

Question The stream function for two dimensional flow is given by ψ =

2xy. The resultant velocity at a point P(2,3)

A 8.45 units /s

B 7.21 units /s

C 6.44 units /s

D 5.18 units /s

Answer B

Marks 2

Unit IIID3

Id

Question A stream function is given by Ψ = 2x2- y

3The velocity at (2,1) will

be,

A 6 m/s

B 8.54 m/s

C 17 m/s

D 8 m/s

Answer B

Marks 2

Unit III D3

Id

Question A flow filed is given V=xj.i+2yz.j-(yz+z2).The resulting type of

flow is

A rotational

B continuous

C unsteady

D laminar

Answer B

Marks 2

Unit III D3

Id

Question The flow net for a 2 dimensional flow past a circular gives a mesh

size of 2 cm in the region of uniform flow where the velocity is

20m/s. What is the velocity at a point where the mesh size is

1.5cm?

A 25.17 m/s

B 26.67m/s

C 30.55m/s

D 14.15m/s

Answer B

Marks 2

Unit III D3

Id

Question The stream function at a point 'p'is Ψ1 and Ψ2 at point 'q'what is

the discharge passing between these two points when t two points

are on 1.Same stream line,2.different stream lines

A Ψ1 =Ψ2 and Ψ1 -Ψ2

B Ψ1 =Ψ2 and zero

C Zero and Ψ1 +Ψ2

D Ψ1 +Ψ2 and Ψ1 -Ψ2

Answer A

Marks 2

Unit III D3

Id

Question Water flows through a straight uniform pipe in which the

discharge is reduced from 100 lps to zero in 10 seconds. If the

cross sectional area of pipe is 200sq-cm,find the acceleration and

its type.

A Tangential acceleration with a value of -0.5m/s2

B Uniform acceleration with a value of -0.1m/s2

C Normal acceleration with a value of 1.5m/s2

D Convective acceleration with a value of -0.5m/s2

Answer A

Marks 2

Unit III D3

Id

Question If the stream function in flow is given by Ψ=1.5 x2.What is the

nature of the flow represented by this function.

A Parallel to y axis in downward direction

B Parallel to Parallel to x axis

C Concentric circle

D Normal to y-axis in upward direction

Answer A

Marks 2

Unit III D3

Id

Question In a 3-D incompressible flow,the velocity components are

u=x2+z

2+5,and v= y

2+z

2-3,find the missing component so that it

satisfy continuity equation.

A w= -2(x+y)z + f(x,y,z)

B w=(y+z)x + f(x,y,z)

C w=-(x+y)+ f(x,y,z)

D w= 2x+y)z + f(x,y,z)

Answer A

Marks 2

Unit III D3

Id

Question The velocity along a streamline passing through origin is given by

V=2√x2+y

2 the velocity and acceleration at (4,3)

A 25 m/s &30m/s2

B 15 m/s &30m/s2

C 10 m/s &20m/s2

D 2.5 m/s &3.0m/s2

Answer C

Marks 2

Unit III D3

Id

Question A Stream function is given by Ψ=3x2+ 3y

2.Is the flow possible,if

so find the magnitude of the velocity.

A 15.25m/s

B 20.83m/s

C 21.63m/s

D 12.58m/s

Answer C

Marks 2

Unit III D3

Id 1

Question A diverges uniformly from 0.1m to 0,2m diameter over a length

of 1m.Determine the local and convective acceleration at the mid

section assuming a flow rate of 0.1m3/s

A 5 m/s2&22.25 m/s

2

B 0 & -42.76m/s2

C 0.5m/s2

D 0 &0.15 m/s2

Answer B

Marks 2

Unit III D 3

Id 2

Question Water flows through a pipe which diverges from 20cms from one

end to 40 cms at the other. If a constant discharge of 150 lps flows

through it find the velocity at both ends to maintain the discharge.

A 12.5 m/s&15.56m/s

B 1.83m/s&0.85m/s

C 2.83 m/s&1.5m/s

D 4.83 m/s &1.25m/s

Answer D

Marks 2

Unit III D 3

Id

Question The area of 2 long tapered duct decreases as A =0.5-0.2 x)where

x,is the distance in meters. At a given instant a discharge of

0.5m3/s is flowing in the duct and is found to increase at a rate of

0.2m3/s. The local acceleration at x=0 will be

A 1.4

B 1.0

C 0.4

D 0.667

Answer B

Marks 2

Unit III D 3

Id

Question A liquid flows downwards through a tapered vertical portion of a

pipe. At the entrance and exit of the pipe the static pressure are

equal. If for a vertical height 'h' velocity becomes 4 times the ratio

of 'h',the velocity head at the entrance will be

A 3

B 8

C 15

D 24

Answer C

Marks 2

Unit IVD3

Id

Question A stream function is give by(x 2- y

2) the potential function of the

flow will be

A 2xy + f(x)

B 2xy + constant

C 2(x2- y

2)

D 2Xy + f(y)

Answer B

Marks 2

Unit III D 3

Id

Question A Pitot-static tube is used to measure the velocity of water using a

differential gauge which contain manometric liquid of reative

density 1.4.The defection in gauge when water flows at avelocity

of 1.2m/s will be (assume coefficient of tube to be 1)

A 183.5mm

B 52.4mm

C 5.24mm

D 73.4mm

Answer B

Marks 2

Unit IVD

University of Pune, Online Examination System, Question Bank

Course

Id

Question The study of motion of fluid with forces which causes the flow

is known as

A fluid kinematics

B fluid dynamics

C fluid statics

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question In dynamics of fluid flow the flow mainly depends on the

A hydrostatic law

B Newton’s law

C conservation of energy

D Darcy’s law

Answer B

Marks 1

Unit IV-A4

Id

Question In fluid dynamics which of the following forces are

predominant

A pressure B gravity C viscous and surface tension D all the above Answer D Marks 1 Unit IV-A4

Id

Question The equation for Reynolds number is

A m.a = Fg + Fp + Fv

B m.a = Fg + Fp + Fv + Ft + Fc

C m.a = Fg + Fp + Fv + Ft + Fc + Fs

D m.a = Fg + Fp + Fv + Ft

Answer D

Marks 1

Unit IV-A4

Id

Question The equation for Euler’s number is

A m.a = Fg + Fp + Fv

B m.a = Fg + Fp + Fv + Ft + Fc

C m.a = Fg + Fp + Fv + Ft + Fc + Fs

D m.a = Fg + Fp

Answer D

Marks 1

Unit IV-A4

Id

Question The equation for Navier-stokes number is

A m.a = Fg + Fp + Fv

B m.a = Fg + Fp + Fv + Ft + Fc

C m.a = Fg + Fp + Fv + Ft + Fc + Fs

D m.a = Fg + Fp

Answer A

Marks 1

Unit IV-A4

Id

Question Rise or Fall of HGL in the direction of flow depends on …..

A change in velocity

B change in pressure

C change in temperature

D all of the above

Answer B

Marks 1

Unit IV-A4

Id

Question For real fluid the TEL is ……. With the direction of flow

A vertical

B curvilinear

C inclined

D none of the above

Answer C

Marks 1

Unit IV-A4

Id

Question For drawing HGL which of the following is attached to pipeline.

A barometer

B piezometer

C pressure gauge

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question Venturimeter consists of which components

A throat

B converging and diverging cone

C both of above a & b

D none of the above

Answer C

Marks 1

Unit IV-A4

Id

Question The diameter of the inlet section of venturimeter will be

A half of pipe diameter

B twice of pipe diameter C one-third of pipe diameter D same as that of pipe Answer D Marks 1 Unit IV-A4

Id Question The tapered portion from pipe to throat is known as A converging cone B diverging cone C throat D none of the above Answer A Marks 1 Unit IV-A4

Id

Question The maximum angle of converging cone is

A 6 0

B 200

C 100

D none of the above

Answer B

Marks 1

Unit IV-A4

Id Question The diameter of throat is generally taken as A half of pipe diameter B twice of pipe diameter C one-third of pipe diameter D same as that of pipe Answer A Marks 1 Unit IV-A4

Id

Question For venturimeter the angle of diverging cone is

A 6 0

B 200

C 100

D none of the above Answer A Marks 1 Unit IV-A4

Id

Question For venturimeter the length of the throat is ………. it’s diameter.

A half

B equal

C twice

D one-third

Answer B

Marks 1

Unit IV-A4

Id

Question For horizontal venturimeter the term ((P1 – P2)/ γ ) is called as

A venturi head

B pressure head

C velocity head

D piezometric head

Answer A

Marks 1

Unit IV-A4

Id

Question The flow in a venturimeter takes place from

A throat to divergent cone

B convergent cone to divergent cone C divergent cone to convergent cone D none of the above Answer B Marks 1 Unit IV-A4

Id

Question A flat circular plate with circular hole is known as ………….

A nozzle

B throat

C venacontracta

D orifice

Answer D

Marks 1

Unit IV-A4

Id

Question The centre hole of orifice plate is bevelled with the angle of ……

A 400 to 500

B 300 to 500

C 300 to 450

D 400 to 600

Answer C

Marks 1

Unit IV-A4

Id Question The diameter of orifice is ……. the diameter of pipe. A twice B same C half D none of the above Answer C Marks 1 Unit IV-A4

Id

Question In case of orifice meter the pressure difference is measured

between ….

A inlet and throat

B inlet and venacontracta

C venacontracta and outlet

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question The section of flow which converges to a minimum after it moves

out of orifice is known as

A orifice

B venture

C venacontracta

D notch

Answer C

Marks 1

Unit IV-A4

Id

Question The theoretical rate of flow is higher in

A venturimeter

B orifice meter

C both of the above

D none of the above

Answer A

Marks 1

Unit IV-A4

Id

Question Venturimeter is preferable for..

A measurement of flow in large pipes

B measurement of flow in smaller pipes

C Measurement of velocity in large pipes

D Measurement of Pressure in large pipes

Answer A

Marks 1

Unit IV-A4

Id

Question In …….. losses are more hence the value of co-efficient of

discharge is low.

A pitot-tube

B venturimeter

C orifice meter

D rotameter

Answer C

Marks 1

Unit IV-A4

Id

Question In order to calculate the velocity by pitot tube for a flowing

stream it is dipped……

A vertically

B horizontally

C inclined

D all the above

Answer A

Marks 1

Unit IV-A4

Id

Question . …….. is an opening having a closed perimeter in the walls or

bottom of a tank.

A throat

B orifice

C nozzle

D mouthpiece

Answer B

Marks 1

Unit IV-A4

Id

Question The shape of orifice is….

A circular

B rectangular

C triangular

D all of the above

Answer D

Marks 1

Unit IV-A4

Id

Question The size of orifice can be……

A small

B large

C A or B

D none of the above

Answer C

Marks 1

Unit IV-A4

Id

Question The nature of the edge of the orifice is ….

A bell mouthed

B sharp edged

C Flat edge

D All of above

Answer C

Marks 1

Unit IV-A4

Id

Question The condition of discharge of orifice is …

A free orifice

B fully submerged

C partially submerged

D all of the above

Answer D

Marks 1

Unit IV-A4

Id

Question The stream of liquid coming out of orifice is called as …

A venacontracta

B head of water

C jet

D nappe

Answer C

Marks 1

Unit IV-A4

Id

Questio

n

The Toricelli’s expression is represented as..

A V2 = Cc gxh)

B V2 = Cv gxh)

C V2 = Cd gxh)

D V2 = gxh)

Answer D

Marks 1

Unit IV-A4

Id

Question . ………. is an opening provided at the side of the tank such that

the liquid surface in the tank is below the top edge of the

opening.

A orifice

B notch

C weir

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question If the whole of the outlet side of an orifice is submerged under

liquid so that it discharges the jet of liquid into the liquid of same

type , it is known as …

A small orifice

B large orifice

C drowned orifice

D free orifice

Answer C

Marks 1

Unit IV-A4

Id

Question The bottom edge of the notch over which the liquid flows

through is called as,

A nappe

B crest

C trough

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question The distance of crest from the bottom of tank is known as…..

A crest

B crest height

C notch

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question The sheet of liquid flowing over the notch is called as

A nappe

B crest

C crest height

D all the above

Answer A

Marks 1

Unit IV-A4

Id

Question The shape of notch is

A rectangular

B triangular

C circular

D all the above

Answer D

Marks 1

Unit IV-A4

Id

Question ……. is defined as a definite volume fixed in space such that the

flow takes place into and out of this volume.

A control surface

B control volume

C specific volume

D none of the above

Answer B

Marks 1

Unit IV-A4

Id

Question Bernoulli's equation is applicable to

A Steady flow

B Unsteady flow

C Both steady and unsteady flow

D None of the above.

Answer A

Marks 1

Unit IV –A4

Id

Question Bernoulli's equation is applicable to

A Compressible flow

B In compressible flow

C Both compressible and incompressible flow

D None of the above.

Answer B

Marks 1

Unit IV –A4

Id

Question Bernoulli's equation for steady state, uniform flow, non-viscous

and incompressible flow is represented by

A (p/ρg)+ v2/2g +gz=C

B (p/ρg)+ v2/2g +z=C

C (p/ρ)+ v2/2g +z=C

D (p/ρg)+ v2/g +z=C

Answer B

Marks 1

Unit IV –A4

Id

Question Each term of Bernoulli's equation represents

A Energy (Nm/N)

B Energy (kW/kg)

C Energy (kgfm/kg)

D Energy(Nm/kg)

Answer A

Marks 1

Unit IV –A4

Id

Question In the Bernoulli's equation, it is assumed that the velocity at a

section is

A Uniform

B Non-uniform

C It decreases from the centre towards periphery

D None of the above.

Answer A

Marks 1

Unit IV –A4

Id

Question Bernoulli's equation takes into account

A Friction loss

B Loss due to change of direction

C All types of losses

D None of the above.

Answer D

Marks 1

Unit IV –A4

Id

Question Bernoulli's equation is applicable between any two points

A When flow is rotational and fluid is incompressible

B Irrotational flow of any type of fluid

C Steady rotational flow'of incompressible fluid

D Steady, irrotational flow of incompressible fluid

Answer D

Marks 1

Unit IV –A4

Id

Question Total head in a flow is the sum of

A Piezometric head and datum head

B Piezometric head and velocity head

C Piezometric head and pressure head

D Piezometric head, velocity head and datum head.

Answer B

Marks 1

Unit IV –A4

Id

Question In venturi-meter

A Length of convergent part is> length of divergent part

B Length of divergent part is> length of convergent part

C Length of convergent part = Length of divergent part.

D There is no restriction regarding lengths of convergent and

divergent parts.

Answer B

Marks 1

Unit IV –A4

Id

Question The function of vena contracta in orifice meter is to

A Create pressure difference between two section in flowing fluid

through the pipe line

B To allow for escape of entrapped air through the pipe line

C To make length of orificemeter small

D None of the above

Answer A

Marks 1

Unit IV –A4

Id

Question A Venturimeter is preferable to orifice meter, because

A It is cheaper

B It is more convenient

C Energy loss is less

D It is easy to assemble

Answer C

Marks 1

Unit IV –A4

Id

Question A pitot tube is used to measure

A Viscosity of the fluid

B Mass flow rate

C Velocity of the fluid'

D None of the above

Answer C

Marks 1

Unit IV –A4

Id

Question The coefficient of discharge (Cd) for orifice meter is

A Greater than Venturimeter

B Less than Venturimeter

C Equal to Venturimeter

D May be greater or less than, Venturimeter.

Answer B

Marks 1

Unit IV –A4

Id

Question The range of coefficient of discharge for Venturimeter is

A 0.64 to 0.68

B 0.7 to 0.8

C 0.8 to 0.9

D 0.96 to 0.98

Answer D

Marks 1

Unit IV –A4

Id

Question The general impulse-momentum principle can be applied if

A The flow is compressible or incompressible

B The fluid is real or ideal

C The energy losses are unknown

D All the above

Answer A

Marks 1

Unit IV –A4

Id

Question The equation ƩFx= ρQ (V2x - V1x) requires the following

assumption

A Flow is steady

B Velocity at both sections is uniform

C Flow is frictionless

D All of the above.

Answer D

Marks 1

Unit IV –A4

Id

Question For constant velocity distribution over a cross-section

A K.E. correction factor is unity

B Momentum correction factor is unity

C Both (a) and (b) are unity

D Both (a) and (b) are not unity.

Answer C

Marks 1

Unit IV –A4

Id

Question The kinetic energy correction factor α is given by

A {1/(A3V3)} ∫ v3dA

B 1/A ∫v3dA

C {1/(AV3)} ∫ v3dA

D {1/(AV3)} ∫ vdA

Answer C

Marks 1

Unit IV –A4

Id

Question The Euler's equation of motion

A is a statement of energy balance

B is a moment of momentum equation

C relates various forces with change In momentum

D is a preliminary step to derive the Bernoulli's equation.

Answer D

Marks 1

Unit IV –A4

Id

Question Bernoulli' s equation relates

A various forces with change in momentum

B torque to change in angular momentum

C various forms of energy

D various forces involved in fluid flow.

Answer C

Marks 1

Unit IV –A4

Id

Question The kinetic energy correction factor

A has units of velocity head

B applies to the continuity equation

C modifies the Bernoulli's constant in the energy equation

D accounts. for the non-uniform distribution of velocity across the

section

Answer D

Marks 1

Unit IV –A4

Id

Question The value of kinetic energy correction factor for laminar flow

through a circular pipe is approximately equal to

A 1.0

B 1.5

C 2.0

D 2.25

Answer C

Marks 1

Unit IV –A4

Id

Question The momentum correction factor is given by the relation:

A (1/A ) ∫( u/V)dA

B (1/A ) ∫( u/V) 2dA

C (1/A ) ∫( u/V) 3dA

D (1/A ) ∫( u/V) 4dA

Answer B

Marks 1

Unit IV –A4

Id

Question The value of momentum correction factor for laminar flow

through a circular pipe is approximately equal to:

A 0.75

B 0.87

C 1.02

D 1.33

Answer D

Marks 1

Unit IV –A4

Id

Question Which of the following equations is known as momentum

principle:

A F = d/dt(m 2v)

B F = dv/dt

C F = d/dt (mv)

D F = d/dt2 (mv)

Answer C

Marks 1

Unit IV –A4

Id

Question The Pizometric head is the summation of

A velocity head and pressure head

B pressure head and elevation head

C velocity head and elevation head

D none of the above.

Answer B

Marks 1

Unit IV –A4

Id

Question The total energy-line is always higher than the hydraulic gradient

line, the vertical distance between the two representing:

A the pressure head

B the piezometric head

C the velocity head

D none of the above.

Answer C

Marks 1

Unit IV –A4

Id

Question The Bernoulli's equation written in the form of p/w + V2/2g+z=

constant represents total energy per unit of certain quantity.

Identify this quantity from the choices given below

A energy per unit mass

B energy per unit weight

C energy per unit volume

D energy per unit specific weight

Answer B

Marks 1

Unit IV –A4

Id

Question The differential manometer connected to a Pitot static tube

used for measuring fluid velocity gives

A Dynamicpressure.

B total pressure

C static pressure

D Difference between total pressure and dynamic pressure.

Answer A

Marks 1

Unit IV A4

Id

Question The hydraulic gradient-line indicates the direction of which of

the following:

A Velocity head in flow direction

B Piezometric head in the direction of flow

C Total energy of flow in the direction

D None of the above.

Answer B

Marks 1

Unit IV –A4

Id

Question The momentum correction factor β is used in account for:

A change in direction of flow

B change in total energy

C non-uniform distribution of velocities at inlet and outlet sections

D change in mass rate of flow.

Answer C

Marks 1

Unit IV -A

Id

Question For a perfect incompressible liquid, flowing in a continuous

stream, the totalenergy of a particle remains the same, while

the particle moves from one point toanother This statement is

called

A Pascal's law

B Archimede's principle

C Continuity equation

D Bemoulli's equation

Answer D

Marks 1

Unit IV-A4

Id

Question When the venturimeter is inclined, then for a given flow it will

show ....reading.

A maximum

B more

C less

D same

Answer D

Marks 1

Unit IV-A4

Id

Question The pressure of the liquid flowing through the divergent cone of

Venturimeter will ---- as compared to its converging cone _

A remains constant

B increases

C depends upon mass of liquid

D decreases

Answer B

Marks 1

Unit IV-A4

Id

Question The terms p/ρg is known as _

A pressure energy per unit weight

B kinetic energy per unit weight

C pressure energy

D none of the above

Answer A

Marks 1

Unit IV-A4

Id

Question The term Z is known as

A potential energy per unit weight

B potential energy

C pressure energy

D none of the above

Answer A

Marks 1

Unit IV-A4

Id

Question All terms of energy in Bernoulli's equation have dimension of

A length

B energy

C work

D mass

Answer A

Marks 1

Unit IV-A4

Id

Question The discharge through the Venturimeter is given by

A Cd √(a12-a2

2) √(2gh) /(a1a2)

B Cd (a1a2) √(2gh) /(√(a12-a2

2))

C Cd (a1-a2) √(2gh) / (a1+a2)

D Cd √(a1a2) √(2gh) /(a1+a2)

Answer B

Marks 1

Unit IV-A4

Id

Question The difference of pressure head (h) measured by a differential

manometer containing lighter liquid is-----where x = difference of

mercury level,Sm = specific gravity of mercury and So = specific

gravity of oil

A h=x(1-Sm/So)

B h=x(Sm/So-1)

C h=x(Sm-So))

D None of the above

Answer A

Marks 1

Unit IV-A4

Id

Question The rate of flow through a Venturimeter varies as

A H(1/2)

B H(3/2)

C H(5/2)

D H

Answer A

Marks 1

Unit IV-A4

Id

Question In order to measure the flow with a Venturimeter, it is installed

in a

A in any direction and in any location

B horizontal line

C vertical line

D inclined line with flow upwards

Answer A

Marks 1

Unit IV-A4

Id

Question A rotameter is used to measure

A velocity of fluids

B flow of fluids

C velocity of gases

D specific gravity of liquids

Answer B

Marks 1

Unit IV-A4

Id

Question The rate of flow through a orifice meter varies as

A H(1/2)

B H(3/2)

C H(5/2)

D H

Answer A

Marks 1

Unit IV-A4

Id

Question Cavitations is caused by

A Low pressure

B High velocity

C Low barometric pressure

D High pressure

Answer A

Marks 1

Unit IV-A4

Id

Question Pitot tube is used to measure the velocity head of

A Flowing fluid

B Still fluid

C Turbulent flow

D Laminar flow

Answer A

Marks 1

Unit IV-A4

Id

Question Separation of flow occurs due to reduction of pressure gradient

to

A The extent such that vapour formation starts

B Zero

C Negligibly low value

D None of the above

Answer C

Marks 1

Unit IV-A4

Id

Question The speed of the fluid is maximum in the Venturimeter at

A convergent duct

B divergent duct

C throat

D none of these

Answer C

Marks 1

Unit IV-A4

Id

Question Coefficient of resistance is defined as the ratio of _

A actual velocity of jet at vena contracta to the theoretical velocity.

-

B area of jet at vena contracta to the area of orifice

C actual discharge through an orifice to the theoretical discharge

D none of the above

Answer D

Marks 1

Unit IV-A4

Id

Question The ratio of actual discharge of a jet of water to its theoretical

discharge is known as _

A co-efficient of viscosity

B co-efficient of velocity

C co-efficient of contraction

D co-efficient of discharge

Answer D

Marks 1

Unit IV-A4

Id

Question The theoretical velocity of jet at venacontracta is---

A 2g H

B H√2g

C √2gH

D 2g √H

Answer C

Marks 1

Unit IV-A4

Id

Question The coefficient of velocity for an orifice is experimentally

measured as by (using usual notations),

A x/(2 √YH)

B 2x/(√YH)

C x/(√4YH)

D √ x2/8YH)

Answer A

Marks 2

Unit IV-A4

Id

Question The discharge through a wholly drowned orifice is given as ----

(Where,H1= Height of water (on the upstream side) above the

top

of the orifice

H2 = Height of the water (on the downstream side) above the

bottom of the orifice and

H = Difference between two water levels on either side of the on

either side of the orifice )

A Q = Cd. b H1 √2gH

B Q = Cd. b (H2-H1)√2g H

C Q = Cd. b H2 √2gH

D Q = Cd. b H√2gH

Answer B

Marks 1

Unit IV-A4

Id

Question An orifice is said to be large, if _

A the available head of liquid is less than 5 times the height of

orifice

B the size of orifice is large

C the velocity of flow is large

D the available head of liquid is more than 5 times the height of

orifice

Answer A

Marks 1

Unit IV-A4

Id

Question The coefficient of velocity is less than 1 because

A h, measured by pitot tube is theoretical

B Opening at start of pitot tube is very small

C Flow velocity is less

D None of the above

Answer A

Marks 1

Unit IV-A4

Id

Question The value of coefficient of discharge is .....the value of

coefficient of velocity for an orifice.

A same as

B more than

C less than

Answer C

Marks 1

Unit IV-A4

Id

Question Pizometric head is the addition of …………

A 2

2

p vz

g

B pz

C 2

2

vz

g

D 2

2

p v

g

Answer B

Mark 1

Unit IV-A4

Id

Question The distance between H.G.L. and T.E.L is shown by

…………head.

A Pressure

B Datum

C Velocity

D Total

Answer C

Mark 1

Unit IV-A4

Id

Question As per Bernoulli’s theorem, the sum of pressure head,

velocity head and datum head for ideal fluid…………

A Changes point to point

B Increase in the direction of flow

C Decrease in the direction of flow

D Remains constant

Answer D

Mark 1

Unit IV-A4

Id

Question As per Bernoulli’s theorem, the sum of pressure head,

velocity head and datum head for real fluid

A Increase in the direction of flow

B Decrease in the direction of flow

C Remains constant

D Zero

Answer B

Mark 1

Unit IV-A4

Id

Question The instrument which is not working on Bernoulli’s

theorem is………

A Venturimeter

B Rotameter

C Pitot tube

D U-Tube manometer

Answer D

Mark 1

Unit IV-A4

Id

Question The kinetic energy correction factor ( ) and

Momentum correction factor ( ) is included in the

Bernoulli’s equation to count the effect of …………

A Variation in the discharge

B Variation in the Velocity

C Variation in pressure

D Variation in viscosity

Answer B

Mark 1

Unit IV-A4

Id

Question To measure the pressure difference between throat

and converging cone in Venturimeter carrying

water……………… manometer is generally used.

A Simple U-Tube

B Inverted U-Tube

C U-Tube differential

D Pizometer

Answer C

Mark 1

Unit IV-A4

Id

Question The modified Bernoulli’s equation = Total head plus

……………

A Pressure head

B Velocity head

C Datum head

D Head loss

Answer D

Mark 1

Unit IV-A4

Id

Question The “throat” is the component part of ……………..

A Venturimeter

B Orifice

C Pitot tube

D Nozzle meter

Answer A

Mark 1

Unit IV-A4

Id

Question At vena contracta fluid jet is having …………diameter

than diameter of orifice.

A Less

B More

C Equal

D Half

Answer A

Mark 1

Unit IV-A4

Id

Question Mouthpiece is used to minimize the effect of

………………..

A Vena contracta

B Velocity of approach

C End contraction

D Variation of pressure

Answer A

Mark 1

Unit IV-A4

Id

Question To measure the discharge of river most suitable device will

be………….

A Notch

B Weir

C Venturiflume

D venturi meter

Answer B

Marks 1

Unit IV-A4

Id

Question A pipe of length more than double the diameter of orifice

fitted externally or internally to the orifice is called a

A Notch

B Weir

C Mouthpiece

D Nozzle

Answer D

Marks 1

Unit 1V-A4

Id

Question In an internal mouthpiece, if the jet after contraction does not

touch the sides of the mouthpiece, then the mouthpiece is said

to be

A Running full

B Running free

C Partially running full

D Partially running free

Answer B

Marks 1

Unit 1V-A4

Id

Question The value of coefficient of velocity for a sharp edged orifice

__________ with the head of water.

A Decreases

B Increases

C Depends on diameter of orifice

D Depends ontype of orifice

Answer B

Marks 1

Unit 1V-A4

Id

Question An orifice is said to be large, if

A The size of orifice is large

B The velocity of flow is large

C The available head of liquid is more than 5 times the height of

orifice

D The available head of liquid is less than 5 times the height of

orifice

Answer C

Marks 1

Unit 1V-A4

Id

Question When a liquid is flowing through a pipe with a velocity of V , the

total energy in the flowing fluid is

A Kinetic energy

B Potential energy

C Elevation energy

D All of above

Answer D

Marks 1

Unit 1V-A4

Id

Question When a liquid is flowing through a pipe, the velocity of the liquid

is

A Maximum at the centre and minimum near the walls

B Minimum at the centre and maximum near the walls

C Zero at the centre and maximum near the walls

D Maximum at the centre and zero near the walls

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

Which direction must a Pitot tube face in order to calculate the

speed of a fluid?

A Direction is not a criteria

B Normal to the flow only.

C Both normal to the flow and parallel to the flow.

D Parallel and facing flow

Answer D

Marks 1

Unit 1V-A4

Id

Question Which one of the following statements is true ?

A The value of kinetic energy correction factor for turbulent flow

lies between 1.03 to 1.06

B The value of kinetic energy correction factor for laminar flow is 2

C The practical value of kinetic energy correction factor for

turbulent flow is unity

D All the above.

Answer D

Marks 1

Unit 1V-A4

Id

Question The line joining the points to which the liquid rises in vertical

piezometer tubes fitted at different cross-sections of a conduit, is

known as

A Hydraulic gradient

B Piezometric line

C Hydraulic grade line

D All the above.

Answer D

Marks 1

Unit 1V-A4

Id

Question Flow of water in pipes of diameter more than 3 meters, can be

measured by

A Pitot tube

B Venturimeter

C Orifice plate

D Rotameter.

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

Hydraulic coefficient of an orifice means the coefficient of

A Velocity

B Contraction

C Resistance

D all the above.

Answer D

Marks 1

Unit 1V-A4

Id

Question A weir is used to measure the large water discharge rate from a

river or from an open channel. A weir is not of __________

shape.

A Circular

B Rectangular

C Triangular .

D Trapezoidal

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

With increase in the ratio of orifice diameter to pipe diameter in

case of an orificemeter, the overall pressure loss

A Decreases

B Increases

C Remains constant

D Increases linearly

Answer C

Marks 1

Unit 1V-A4

Id

Question The discharge formula Q = Cd 2gH x A is used for rectangular

A Small orifices only

B Large orifices only

C Small and large orifices only

D For all types of orifices.

Answer B

Marks 1

Unit 1V-A4

Id

Question Flow rate of high velocity flue gas discharged through a stack to

the atmosphere can be most conveniently measured by a

A Pitot tube

B Manometer

C Rotameter

D None of these

Answer A

Marks 1

Unit 1V-A4

Id

Question A rotameter works on the principle of __________ pressure

drop.

A Constant

B Variable

C Both (a) & (b)

D Neither (a) nor (b)

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

An orifice is an opening in a vessel with

A Closed perimeter of regular shape through which water flows

B The water level of the liquid on the up stream side is below the

top of the orifice

C Partially full flow

D Prolonged sides having length of 2 to 3 diameters of the opening

in thick wall.

Answer A

Marks 1

Unit 1V-A4

Id

Question Discharge through a totally submerged orifice, is directly

proportional to

A Difference in elevation of water surfaces

B Square root of the difference in elevation of water surface

C Square root of the opening

D Reciprocal of the area of the opening

Answer B

Marks 1

Unit 1V-A4

Id

Question Pick up the correct statement regarding convergent divergent

mouth piece from the following :

A It converges uptoVenacontracta and then diverges

B In this mouth piece there is no loss of energy due to sudden

enlargement

C .The coefficient of discharge is unity

D All the above.

Answer D

Marks 1

Unit 1V-A4

Id

Question Select the wrong statement pertaining to flow of an

incompressible fluid through a venturimeter.

A For frictionless flow, the fluid pressure entering the venturi

meter will be exactly equal to that leaving the venturimeter.

B Discharge of fluid through a venturimeter depends upon the

gage difference irrespective of the orientation of venturimeter.

C Venturimeter occupies less space than an orificemeter.

D Venturimeter incurs less power loss compared to an equivalent

orificemeter

Answer C

Marks 1

Unit 1V-A4

Id

Question In an inclined position, a Venturimeter records

A More reading

B Less reading

C Same reading

D None of these.

Answer C

Marks 1

Unit 1V-A4

Id

Question Which is not a variable head meter?

A Venturimeter

B Pitot tube

C Rotameter

D None of these

Answer C

Marks 1

Unit 1V-A4

Id

Question Vena-contracta pressure tapping is at a distance __________

from the position of an orificemeter fitted in a pipe of internal

diameter 'd'

A d

B 0.5 d

C 2d

D 4d

Answer B

Marks 1

Unit 1V-A4

Id

Questio

n

In case of a rotameter, the density of the float material is

__________ that of the liquid it replaces.

A More than

B Less than

C Equal to

D Either (a) or (b)

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

Which of the fluid forces are not considered in the Reynold's

equation of flow ?

A Viscous forces

B Turbulent forces

C Pressure forces

D Compressibility forces

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

Which of the following assumptions enables the Euler's equation

of motion to be integrated?

A The fluid is incompressible.

B The fluid is non-viscous.

C The flow is rotational and incompressible.

D Both a &b

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

Which is the most efficient and best for measuring very small flow

rate of gases ?

A Venturimeter

B Orifice meter

C Rotameter

D Flow nozzle

Answer C

Marks 1

Unit 1V-A4

Id

Questio

n

Which of the following is used for very accurate measurement of

flow of gas at low velocity ?

A Pitot tube

B Rotameter

C Segmental orificemeter

D Hot wire anemometer

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

The discharge over a right angled notch is (where H = Height of

liquid above the apex of notch)

A Cd 2g x H

B Cd 2g x H3/2

C Cd 2g x H2

D Cd 2g x H5/2xxxxxxxxxxxxcheck syllabus

Answer

Marks

Unit 1V-A4

Id

Questio

n

A weir is said to be broad crested weir, if the width of the crest of

the weir is __________ half the height of water above the weir

crest.

A equal to.

B less than

C more than

D None of above

Answer C

Marks 1

Unit 1V-A4

Id

Questio

n

The discharge through a large rectangular orifice is given by

(where H1 = Height of the liquid above the top of the orifice, H2 =

Height of the liquid above the bottom of the orifice, b = Breadth of

the orifice, and Cd = Coefficient of discharge)

A Q = Cd x b2g(H2 - H1)

B Q = Cd x b2g(H21/2 - H11/2)

C Q = Cd x b2g(H23/2 - H13/2)

D Q = Cd x b2g(H22 - H12)

Answer C

Marks 1

Unit 1V-A4

Id

Questio

n

The maximum discharge over a broad crested weir is

A 0.384 Cd x L x H1/2

B 0.384 Cd x L x H3/2

C 1.71 Cd x L x H1/2

D 1.71 Cd x L x H3/2

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

The coefficient of discharge for an external mouthpiece is

A 0.375

B 0.5

C 0.707

D 0.855

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

In an external mouthpiece, the absolute pressure head at vena

contracta is __________ the atmospheric pressure head by an

amount equal to 0.89 times the height of the liquid, above the

vena contracta.

A 1V-A4

B More than

C Equal to

D None of the above

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

Which of the following statement is wrong?

A A flow whose streamline is represented by a curve, is called two

dimensional flow.

B The total energy of a liquid particle is the sum of potential energy,

kinetic energy and pressure energy.

C The length of divergent portion in a venturimeter is equal to the

convergent portion.

D A pitot tube is used to measure the velocity of flow at the required

point in a pipe.

Answer C

Marks 1

Unit 1V-A4

Id

Questio

n

The discharge over a triangular notch is

A inversely proportional to H3/2

B directly proportional to H3/2

C inversely proportional to H5/2

D directly proportional to H5/2

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

The discharge through an external mouthpiece is given by (where

a = Cross-sectional area of the mouthpiece, and H = Height of

liquid above the mouthpiece)

A 0.82 a√2gH

B 1.855 a√H2g

C 1.585 a√2gH

D 5.85 a√H2g

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

If a pitot tube is placed with its nose upstream, downstream or

sideways, the reading will be the same in every case.

A True

B False

C Depends on size of pitot tube

D Depends on viscosity of fluid

Answer B

Marks 1

Unit 1V-A4

Id

Question In area meter (e.g., rotameter), with increase in the fluid flow

rate, the

A Pressure drop increases linearly.

B Pressure drop is almost constant.

C Area through which fluid flows does not vary.

D None of these.

Answer B

Marks 1

Unit 1V-A4

Id

Question When an internal mouthpiece is running free, the discharge

through the mouthpiece is (where a = Area of mouthpiece, and

H = Height of liquid above the mouthpiece)

A 0.5 a√2gH

B 0.707 a√2gH

C 0.855 a√2gH

D a√2gH

Answer A

Marks 1

Unit 1V-A4

Id

Question Re-entrant or Borda's mouthpiece is an __________

mouthpiece.

A Internal .

B External

C Convergent

D Divergent

Answer A

Marks 1

Unit 1V-A4

Id

Question When the coefficient of discharge (Cd) is 0.623, then the general

equation for discharge over a rectangular weir is

A 1.84(L - 0.1nH)H3/2

B 1.84(L - nH)H2

C 1.84(L - 0.1nH)H5/2

D 1.84(L - nH)H3

Answer A

Marks 1

Unit 1V-A4

Id

Question The difference between the notch and weir is that the notch is

of bigger size and the weir is of a smaller size.

A Agree

B Disagree

C There is no difference

D Weir is used for river and notch for pipes

Answer B

Marks 1

Unit 1V-A4

Id

Question A weir is said to be narrow-crested weir, if the width of the crest

of the weir is __________ half the height of water above the weir

crest.

A equal to

B Less than

C more than

D None of above

Answer B

Marks 1

Unit 1V-A4

Id

Question The discharge through a wholly drowned orifice is given by

(where H1 = Height of water (on the upstream side) above the

top of the orifice, H2 = Height of water (on the downstream

side) above the bottom of the orifice, and H = Difference

between two water levels on either side of the orifice)

A Q = Cd x bH1 2gh

B Q = Cd x bH2 2gh

C Q = Cd x b ( H2 - H1 ) 2gh

D Q = Cd x bH 2gh

Answer C

Marks 1

Unit 1V-A4

Id

Question A notch is used to measure __________ of liquids.

A Pressure

B Discharge

C Velocity

D Volume

Answer B

Marks 1

Unit 1V-A4

Id

Question An opening in the side of a tank or vessel such that the liquid

surface with the tank is below the top edge of the opening, is

called

A Weir

B Notch

C Orifice

D None of these

Answer B

Marks 1

Unit 1V-A4

Id

Question The theoretical velocity of jet at vena contracta is (where H =

Head of water at vena contracta)

A √2gH

B H2g

C 2gH

D H/2g

Answer A

Marks 1

Unit 1V-A4

Id

Question In a convergent mouthpiece, the absolute pressure head at vena

contracta is the same as that of the atmosphere.

A True

B False

C Pressure cannot be measured

D None of above

Answer A

Marks 1

Unit 1V-A4

Id

Question The range of a particular Rotameter can be increased by

A Use of floats of different densities.

B No means.

C Increasing the diameter of the float.

D Decreasing the diameter of the float.

Answer A

Marks 1

Unit 1V-A4

Id

Question Out of the following flow measuring devices, which one incurs

the maximum installation cost as well as pressure loss ?

A Flow nozzle

B Venturimeter

C Rotameter

D Orificemeter

Answer B

Marks 1

Unit 1V-A4

Id

Question The discharge through a convergent mouthpiece is __________

the discharge through an internal mouthpiece of the same

diameter and head of water.

A Equal to

B One-half

C Three fourth

D Double

Answer D

Marks 1

Unit 1V-A4

Id

Question In an internal mouthpiece, if the jet after contraction expands

and fills up the whole mouthpiece, then the mouthpiece is said

to be running free.

A True

B Condition not applicable to mouthpiece

C False

D The type cannot be identified

Answer B

Marks 1

Unit 1V-A4

Id

Question An internal mouthpiece is said to be running __________ if the

length of the mouthpiece is more than three times the diameter

of the orifice.

A Free

B Partially

C Full

D Totally submerged

Answer C

Marks 1

Unit 1V-A4

Id

Question An orifice is always of circular shape

A True

B False

C Shape is not a criteria

D None of above

Answer B

Marks 1

Unit 1V-A4

Id

Question While applying the Bernoulli's equation = total head, the work

any section done on the flow system, if any

A Is added on the right side of the equation

B Is added on the left side of the equation

C Is ignored

D None of these.

Answer B

Marks 1

Unit 1V-A4

Id

Question A short tube mouthpiece will not run full at its outlet if the head

under which the orifice works, is

A Less than 12.2 m of the water

B More than 12.2 m of the water

C Equal of 12.2 m of water

D None of these.

Answer B

Marks 1

Unit 1V-A4

Id

Question Pick up the correct statement regarding Borda's mouth piece

running full from the following :

A Actual velocity at the out let is gH

B Theoretical velocity at the outlet is 2gH

C Coefficient of velocity is 1/2

D All the above.

Answer D

Marks 1

Unit 1V-A4

Id

Question The most serious disadvantage of an orificemeter is that

A It is not very accurate.

B It is very costly.

C Most of the pressure drop is not recoverable.

D It is very small

Answer C

Marks 1

Unit 1V-A4

Id

Question Which of the following relationship is valid for the equilibrium

position of the float in a rotameter ?(where, Df= Drag force on

the float Bf = Buoyant force on the float Wf = Weight of the

float)

A Df + Bf = Wf

B Df = Bf + Wf

C Df + Bf + Wf =0

D none of these

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

Though angle of deviation of liquid is more in internal mouth

piece, the contraction of the jet, is

A More in the internal mouth piece

B Less in the internal mouth piece

C Equal to external mouth piece

D None of these.

Answer A

Marks 1

Unit 1V-A4

Id

Questio

n

Water flows through a convergent mouthpiece of diameter 4 cm

at convergence under a head of 3 metres. If the maximum vacuum

pressure is 9 metres of water, the maximum diameter of

divergence, to aviod separation of flow, is

A 4 cm

B 6 cm

C 2 cm

D 23 cm.

Answer C

Marks 1

Unit 1V-A4

Id

Questio Venturimeter, orificemeter and nozzles are used to measure the

n fluid discharge from a pipeline. The average fluid velocity in a

pipeline can be measured by a/an

A Weir

B Hot wire anemometer

C Cup and vane anemometer

D None of these

Answer B

Marks 1

Unit 1V-A4

Id

Question If a pitot tube is placed with its nose facing downstream, the

liquid

A Does not rise in the tube

B Rises in the tube to a certain height

C Falls in the tube to a depth

D None of above

Answer C

Marks 1

Unit 1V-A4

Id

Question The discharge through an internal mouth piece is more if its

length is

A < diameter

B <diameter

C ≥ diameter

D none of these.

Answer C

Marks 1

Unit 1V-A4

Id

Question The Euler’s equation of motion

A is a statement of energy balance

B is a preliminary step to derive the Bernoullis equation

C statement of conservation of momentum for a real fluid

D statement of conservation of momentum for the flow of an

inviscid fluid

Answer D

Marks 1

Unit 1V-A4

Id

Questio

n

When no external energy is imposed , which of the following

statements would be true ?

1 Energy line always falls in the direction of flow

2 Hydraulic gradient line never rises in the direction of flow

3 Specific energy may increase or decrease in the direction of

flow

4 Energy line and hydraulic gradient line can cross each other

A 1 and 2

B 2 and 3

C 3 and 4

D 1 and 3

Answer A

Marks 1

Unit 1V-A4

Id

Question Least possible value of correction factor for

1 kinetic energy is zero

2. Kinetic energy is 1

3. momentum is zero

4. momentum is 1

The correct statements is

A 1 and 3

B 2 and 3

C 1 and 4

D 2 and 4

Answer D

Marks 1

Unit 1V-A4

Id

Question The derivation of momentum equation Fx = ρQ{(V2)x –(V1)x) is

based on certain assumptions

1. steady flow

2 .uniform flow

3 .velocity constant over the inlet and outlet cross sections

4 .irrotational flow

A 1,2

B 1,4

C 1 ,3

D 4,5

Answer C

Marks 1

Unit 1V-A4

Id

Question The change in moment of momentum of fluid due to flow along a

curved path results in

A a dynamic force which passes through the centre of curvature

B torque

C a change in pressure

D a change in kinetic energy of jet

Answer B

Marks 1

Unit 1V-A4

Id

Question In 1643 ,Torricelli experimentally demonstrated that the

velocity of jet flowing out of a small opening (called orifice )

depends ,on the head of liquid measured above the centre of

orifice. The Toricelli theorem gives the velocity of jet as

A √gh

B √2gh

C √(2gh/3)

D √3gh2/4)

Answer B

Marks 1

Unit 1V-A4

Id

Question The stagnation pressure is the sum of

A vacuum pressure and static pressure

B static pressure and dynamic pressure

C dynamic pressure and vacuum pressure

D absolute pressure and dynamic pressure

Answer B

Marks 1

Unit 1V-A4

Id

Question A liquid is capable of doing work by virtue of its sustained

pressure . It has units of kg-m /kg in MKS and N-m/N in SI , and

is represented by

A p/ρ

B ρp/γ

C p/γ

D p/z

Answer C

Marks 1

Unit 1V-A4

Id

Question The integration of the Eulers equation results in the Bernoulli’s

equation. The Bernoulli constants for points lying on the same

streamline and those which lie on other streamlines will have

the same value if the flow is

A incompressible

B steady

C irrotational

D uniform

Answer C

Marks 1

Unit 1V-A4

University of Pune, Online Examination System, Question Bank

Course

Id

Question For the two dimensional flow, the stream function is given by ψ =

2xy. The velocity at a point (3, 4) is

A 6 m/sec

B 8 m/sec

C 10 m/sec

D 12 m/sec

Answer C

Marks 1

Unit III –B

Id

Question The flow in a river during the period of heavy rainfall is :

A steady ,uniform, two-dimensional

B unsteady ,uniform, three-dimensional

C unsteady ,non-uniform and three –dimensional

D steady, non-uniform and three dimensional

Answer C

Marks 1

Unit III –B

Id

Question A water supply pipeline changes its alignment through a bend .

when the flow in the pipeline is increases by operating a valve ,

the flow in the bend is classified as

A unsteady, uniform flow

B unsteady ,non-uniform flow

C steady ,uniform flow

D steady, non-uniform flow

Answer B

Marks 1

Unit III-B3

Id

Question Which one of the following velocity fields represents a possible

fluid flow?

A u=x, v=y

B u=x2 , v = y2

C u= xy , v = x2y2

D u=x , v= -y

Answer D

Marks 2

Unit III-B3

Id74

Question Two flow patterns are represented by their stream functions

Ψ1 and Ψ2as 1 = x2+y

2and Ψ2= 2xy. If these two patterns are

superposed on one another , the resulting streamline pattern can

be represented by one of the following

A A family of parallel streamlines

B A family of circles

C A family of parabolas

D A family of hyperbolas

Answer D

Marks 1

Unit III-B3

Id

Question In a compressible flow, the area of flow, the velocity of flow and

the mass density are denoted by a,v and m respectively. At a

particular section, the differential form of the continuity equation

is

A da/a = dv/v +dm/m

B da/a = dv/v -dm/m

C da/a =- dv/v +dm/m

D da/a =- dv/v -dm/m

Answer D

Marks 2

Unit III-B3

Id

Question Consider the following parameters related to fluid flow

1 Vorticity

2 Velocity potential

3 Stream function

Among these , those which exist both in rotational flows and

Irrotational flows would include

A 1 and 2

B 2 and 3

C 1 and 3

D 1,2 and 3

Answer C

Marks 2

Unit III-B3

Id

Question An inert tracer is injected continuously from a point in an

unsteady flow field. The locus of locations of all the tracer

particles at an instance of time represents

A streamline

B Path line

C stream tube

D streak line

Answer D

Marks 2

Unit III-B3

Id

Question The rate of rotation of a fluid particle is given

A ωy = 0 , ωz = - y/2h

B ωy = 0 , ωz = y/2h

C ωy = y/h , ωz = y/h

D none of these

Answer A

Marks 2

Unit III-B3

Id

Question Which of the following conditions will be satisfied by steady

Irrotational flow?

1 ∂u/∂y+∂v/∂x =0

2 - ∂u/∂y+∂v/∂x =0

3 ∂u/∂x+∂v/∂y =0

select the correct answer using the codes given below codes

A 1 and 2

B 2 and 3

C 1 and 3

D 1,2 and 3

Answer B

Marks 2

Unit III-B3

Id

Question The relation that must hold for the flow to be Irrotational

A ∂u/∂ y –∂ v /∂ x = 0

B ∂ u/∂ x –∂ v /∂ y = 0

C ∂2u/∂ x

2+∂2

v /∂y2=0

D ∂u/∂ y +∂v /∂ x = 0

Answer A

Marks 2

Unit III-B3

Id

Question The following stream function ψ = x3/3 –x

2–xy

2+y

2 will represent

/satisfy

A rotational flow and Laplace equation

B Irrotational flow and Laplace equation

C Irrotational flow and equation of continuity

D Irrotational flow ,Laplace equation and equation of continuity

Answer D

Marks 2

Unit III-B3

Id

Question Consider the following statements

1.In Lagrangian method of describing the motion of fluid , an

observer concentrates on a point in the fluid system .

2. The components of acceleration of the fluid particle are v

∂v/∂s and ∂v/∂s

3. A particle moving in a curved path will always have a

normal acceleration v2/r towards the centre of the curved

path.

Which of these statements are

A 1,2 and 3

B 1 and 2

C 1 and 3

D 2 and 3

Answer D

Marks 2

Unit III-B3

Id

Question Acceleration in the normal direction to a stream line is represented

by (symbols have usual meanings)

A ∂Vn/∂t + Vs2/r

B ∂Vs/∂t + Vn2/r

C ∂Vn/∂t + ∂Vs /∂t

D ∂Vs/∂t + ∂Vs /∂ t

Answer A

Marks 2

Unit III-B3

Id

Question A two dimensional flow is described by velocity components u=

2x and v =-2y . The discharge between points (1,1) and (2,2 ) is

equal to

A 9 units

B 8 units

C 7 units

D 6 units

Answer A

Marks 2

Unit III-B3

Id

Question The pressure gradient in the direction of flow is equal to the

A shear gradient parallel to the direction of flow

B shear gradient normal to the direction of flow

C velocity gradient parallel to the direction of flow

D velocity gradient normal to the direction of flow

Answer B

Marks 2

Unit III-B3

Id

Question A velocity field with no components in the y and z directions is

given by, v = 6 + 2xy + t2The acceleration along the x-direction at

a point (3, 1,2) at time 2, is

A 36 units

B 8 units

C 16 units

D 46 units

Answer A

Marks 2

Unit III-B3

Id

Question Velocity field in fluid V = 4x3i - 10 x

2yj + 2 tk. The velocity of

particle at (2, 3, 1) and t = 2 sec. is,

A 124 m/s

B 12 m/s

C 24 m/s

D 111 m/s

Answer A

Marks 2

Unit III-B3

Id

Question The velocity potential function for 2D flow is Φ= x(2y -1). At

point P(1,1), the velocity is,

A √5 unit

B √15 unit

C √1.5 unit

D √2.5 unit

Answer A

Marks 2

Unit III-B3

Id

Question For 3D flow described V = (y2+ z

2)i + (x

2+ z2)j+ (x

2+ y

2) k. The

component of velocity in x direction at (1, 2, 3) is,

A 13 m/s

B 5 m/s

C 8 m/s

D 10 m/s

Answer A

Marks 2

Unit III-B3

Id

Question Velocity field in fluid V = 4x3i - 10 x

2y j + 2tk. The velocity of a

particle at (1, 1, 1)and t =1 sec is,

A 2√30

B 3√30

C √30

D 4√30

E None of the above

Answer A

Marks 2

Unit III-B3

Id

Question If u and v are the components of velocity in the x and y directions

of a flow given by, U = ax + by; V = cx + dy then the condition

to be satisfied is

A a + d = 0

B a + c = 0

C b + d = 0

D a + b + c + d = 0

Answer A

Marks 2

Unit III-B3

Id

Question A 30 cm diameter pipe carrying water 3 m/s changes to 20 cm

diameter. The velocity at 20 cm diameter end is, _

A 9 m/s

B 81m/s

C 3 m/s

D 6.75m/s

Answer D

Marks 2

Unit III-B3

Id

Question A velocity potential function = 3xy ,is the flow possible

A Yes

B No

C Can’t say

D Insufficient data

Answer A

Marks 2

Unit III-B3

Id

Question Select the relation that must hold if the two dimensional flow in

the x-y plane is Irrotational

A ∂v/∂x-∂u/∂y=0

B ∂w/∂y-∂v/∂z=0

C ∂u/∂z-∂w/∂x=0

D ∂v/∂y-∂u/∂x=0

Answer A

Marks 2

Unit III-B3

Id

Question Indicate the turbulent flow conditions amongst the following:

A rise of water in plants through roots

B flow of water through pipes

C flow of oil in measuring instruments

D movement of blood in the arteries of a human body

Answer B

Marks 2

Unit III-B3

Id

Question Which aspect is not true in the context of a flow-net?

A is applicable to Irrational fluid flow

B the bounding surface forms streamlines and the equipotential lines

intersect the boundaries at right angles

C spacing between streamlines as well as that between equipotential

lines is inversely proportional to local velocities

D for prescribed bounding surface, the flow net changes with

reversal in the flow direction.

Answer D

Marks 2

Unit III-B3

Id

Questio

n

The component of velocity u and v along x and y directions in a

2D incompressible fluid are

A u=x2cos y ; v=2x siny

B u= x+2; v=1-y

C u=xyt; v=x3– y

2t/2

D U= ln x+ y; v= xy – y/x

Answer A

Marks 2

Unit III-B3

Id

Question The head loss in case of hot water flow through a pipe compared

to cold water will be

A same

B more

C less

D More or less depending on temperature

Answer C

Marks 1

Unit III-B3

Id

Question For a flow through a horizontal pipe,the pressure gradient in the

flow direction is

A +ve

B 1

C zero

D -ve

Answer D

Marks 2

Unit III-B3

Id

Question The differential manometer connected to pitot static tube used for

measuring fluid velocity gives

A Static pressure

B Total pressure

C Dynamic pressure

D Difference between total and dynamic pressure

Answer C

Marks 2

Unit III-B3

Id

Question The realization of velocity potential in fluid flow indicates that

the

A Flow must be irrotational

B Circulation around any close curve must have a finite value

C Flow is rotational and and satisfy the contunity equation

D Vorticity must be non zero

Answer A

Marks 2

Unit III-B3

Id

Question In a 2-D flow in a x-y plane, if ∂u/∂y =∂v/∂x then fluid element

will undergo

A Translation only

B Translation and rotation

C Translation and deformation

D Rotation and deformation

Answer A

Marks 2

Unit III-B3

Id

Question If energy grade line and hydraulic grade lines are drawn for flow

through an inclined pipeline the following quantities can be

directly observed

A Static head

B Friction head

C Datum head

D Velocity head

Answer D

Marks 2

Unit III-B3

Id

Question Air flows through converging duct at 60 m/s and flows through a

0.5mx 0.5m rectangular duct, the rate of flow in m3/hr is

A 500 m3/hr

B 2500 m3/hr

C 54,000 m3/hr

D 65,000 m3/hr

Answer C

Marks 2

Unit III-B3

Id

Question For an steady flow of fluid which statement is correct

A Total acceleration = convective acceleration + local acceleration

B Total acceleration = convective acceleration

C Total acceleration = local acceleration

D Total acceleration = zero

Answer B

Marks 2

Unit III-B3

Id

Question The method of drawing flow net by graphical method

A Velocity potential lines are drawn first

B Streamlines are drawn first

C Velocity potential lines and stream lines are drawn

simultaneously

D None of the above

Answer B

Marks 2

Unit III-B3

Id

Question Path line can cross the stream line at right angles when flow is

A rotational

B Irrotational and unsteady

C Irrotational and steady

D Unsteady

Answer D

Marks 2

Unit III-B3

Id

Question The following are the practical examples of contunity equation

A For one dimensional flow-if mean velocity at one section is

known,the mean velocity at any other section can be found out

B For two dimensional flow-if any one velocity componenet is

known,its perpendicular component at that point can be computed

C Both A &B

D None of the above

Answer C

Marks 2

Unit III-B3

Id

Question The method of drawing flow net by graphical method

A Velocity potential lines are drawn first

B Streamlines are drawn first

C Velocity potential lines and stream lines are drawn

simultaneously

D None of the above

Answer B

Marks 2

Unit III-B3

University of Pune, Online Examination System, Question Bank

Course

Id

Question

The red lines shown indicates -----

A Stream line

B Streak line

C Path line

D None of the above

Answer D

Marks 1

Unit III-C3

Id

Question

The fig shows ----

A Stream tube which is a fluid mass bounded by a group of stream

lines.

B Pipe consisting of network of potential lines .

C Pipe consisting of network of path lines

D Non eof the above

Answer A

Marks 1

Unit III-C3

Id

Question

The figure shows

A Stream line

B Streak line

C Path line

D None of the above

Answer C

Marks 1

Unit III-C3

Id

Question

In the figure the line joining the points is called as

A Stream line

B Streak line

C Path line

D None of the above

Answer B

Marks 1

Unit III-C3

Id

Question

The flow through pipe shown in figure is a---

A One dimensional flow

B Two dimensional flow

C Three dimensional flow

D Four dimensional flow

Answer C

Marks 1

Unit III-C3

Id

Question The flow through pipe shown in figure is

A Laminar flow

B Turbulent flow

C Transitional flow

D None of the above

Answer A

Marks 1

Unit III-C3

Id

Question The flow through pipe shown in figure is

A Laminar flow

B Turbulent flow

C Transitional flow

D None of the above

Answer B

Marks 1

Unit III-C3

Id

Question

The path taken by smoke coming out of chimney shows ----lines

A Stream line

B Streak line

C Path line

D None of the above

Answer B

Marks 1

Unit III-C3

Id

Question In an experimental work to trace the mmion of fluid particles, a

coloured dye may be injected into theflowingfluid and the

resulting colouredfilament lines at a given location give -------

line

A Stream line

B Streak line

C Path line

D None of the above

Answer B

Marks 1

Unit III-C3

Id

Questio

n

The figure illustrates

A Pure or linear translation of fluid particles

B Linear motion with deformation fluid particles

C Rotational motion fluid particles

D Angular deformation fluid particles

Answer A

Marks 1

Unit III-C3

Id

Questio

n

The figure illustrates

A Pure or linear translation of fluid particles

B Linear motion with deformation fluid particles

C Rotational motion fluid particles

D Angular deformation fluid particles

Answer B

Marks 1

Unit III-C3

Id

Questio

n

The figure illustrates

A Pure or linear translation of fluid particles

B Linear motion with deformation fluid particles

C Rotational motion fluid particles

D Angular deformation fluid particles

Answer C

Marks 1

Unit III-C3

Id

Questio

n

The figure illustrates

A Pure or linear translation of fluid particles

B Linear motion with deformation fluid particles

C Rotational motion fluid particles

D Angular deformation fluid particles

Answer D

Marks 1

Unit III-C3

Id

Questio

n

The flow pattern represented in fig (a),(b) & (c) can be expressed

respectively as

A y=c, x=c & y= mx+c

B y=f(x), x=y2 & y= mx+c

C y=mx c,x=y2 & x= my+c

D y= 0,x=0 & y= x2

Answer A

Marks 1

Unit III-C3

Id

Question The flow pattern represented in fig (d) and (e) can be expressed

respectively as -

A y=c, y= mx+c

B y= f(x), x2+y

2 =c

C y=mx ,x=y2 & x= my+c

D y= x& y= x2

Answer B

Marks 1

Unit III-C3

Id

Question The figure shows 2 pipes of different size. Find the loss of

energy between section (1) &(2)

A 1.276 kg-m

B 1.00 kg-m

C 0,725 kg-m

D 0.15 kg-m

Answer C

Marks 1

Unit III-C3

Id

Question A pipe of cross sectional area 20 cm2 carrying flow at velocity of

50cm/s branches into 3 pipes of cross sectional area,10 cm2, 15

cm2&10 cm

2 respectively.

Find the velocity in pipe (2), if the velocity in pipe (3) &(4) are

30cm/s &20cm/s respectively.

A 15

B 29

C 30

D 35

Answer D

Marks 1

Unit III-C3

Id

Question Water flow through a pipeline consisting of four pipe of different

diameter at four section

As shown in fig.

The correct sequence of section number in the decreasing order

of pressure is

A 3 1 4 2

B 1 3 2 4

C 1 3 4 2

D 3 1 2 4

Answer D

Marks 1

Unit III-C3

Id

Question A pipe flow system with flow direction is shown in fig.The

velocity and area of the pipes are as below

Pipe No 1 2 3 4

Area(cm2) 50 50 80 70

Velocity

cm/s

10 V2 5 5

Find the value of velocity V2

A 2.5 cm/s

B 5.0 cm/s

C 7.5 cm/s

D 10 cm/s

Answer B

Marks 1

Unit III-C3

Id

Question An elbow nozzle assembly shown in figure is in a horizontal

plane .The velocity of flow from nozzle is

A 4 m/s

B 16 m/s

C 24 m/s

D 30 m/s

Answer C

Marks 1

Unit III-C3

Id

Question The pipe cross section and fluid flow rate are shown in

figure. The velocity in pipe A, is

A 1.5m/s

B 3.0 m/s

C 15 m/s

D 30 m/s

Answer A

Marks 1

Unit III-C3

University of Pune, Online Examination System, Question Bank

Course

Id

Question A flow through a long pipe at varying rate is called __________

uniform flow.

A steady

B unsteady

C One dimensional flow

D Rotational flow

Answer B

Marks 1

Unit III-A3

Id

Question A flow in which each liquid particle has a definite path and their

paths do not cross each other, is called

A Steady flow

B Uniform flow.

C Streamline flow

D Turbulent flow

Answer C

Marks 1

Unit III-A3

Id

Question A stream line is

A The line of equal velocity in a flow

B The line along which the rate of pressure drop is uniform

C The line along the geometrical center of the flow

D Fixed in space in steady flow.

Answer D

Marks 1

Unit III-A3

Id

Question A flow whose streamline is represented by a curve, is called

A one-dimensional flow

B two-dimensional flow

C three-dimensional flow

D four-dimensional flow

Answer B

Marks 1

Unit III-A3

Id

Question The imaginary line drawn in the fluid in such a way that the

tangent to any point gives the direction of motion at that point, is

known as

A path line

B stream line

C steak line

D potential line

Answer B

Marks 1

Unit III-A3

Id

Question A flow in which each liquid particle do not have a definite path

and the paths of individual particles also cross each other, is

called turbulent flow.

A Agree

B Disagree

C Can’t say

D Insufficient data

Answer A

Marks 1

Unit III-A3

Id

Question If an incompressible liquid is continuously flowing through a

pipe, the quantity of liquid passing per second is different at

different sections.

A True

B False

C Can’t say

D In sufficient data

Answer B

Marks 1

Unit III-A3

Id

Question A flow through an expanding tube at constant rate is called

A steady uniform flow

B steady non-uniform flow

C unsteady uniform flow

D unsteady non-uniform flow

Answer B

Marks 1

Unit III-A3

Id

Question Flow occurring in a pipeline when a valve is being opened is

A Steady

B Unsteady

C Laminar

D Vortex

Answer B

Marks 1

Unit III-A3

Id

Question In steady flow of a fluid, the acceleration of any fluid particle is

A Constant

B Variable

C Zero

D Never zero

Answer C

Marks 1

Unit III-A3

Id

Question Two dimensional flow occurs when the

A Velocity is a f(x)

B Velocity is a f(x,y)

C Velocity is a f(x,y,t)

D Velocity is a f(x,y,z)

Answer B

Marks 1

Unit III-A3

Id

Question Separation of flow occurs due to reduction of pressure gradient to

A Zero

B Negligibly low value

C The extent such that vapour formation starts

D None of the above

Answer C

Marks 1

Unit III-A3

Id

Question Which of the following statements are true about the steady flow

of a fluid in a stream-tube?

A Mass flow is conserved.

B The speed increases if the cross-sectional area increases.

C The density must be constant.

D Bernoulli's equation is not applicable.

Answer A

Marks 1

Unit III-A3

Id

Question Two dimensional stream function

A Relates velocity and pressure.

B Is constant along a stream line.

C Is constant along an equipotential surface.

D None of these.

Answer B

Marks 1

Unit III-A3

Id

Question What causes convective acceleration in fluid flow ?

A Steep slope in flow

B Unsteady nature of flow

C Non-uniformity of flow

D Turbulence in flow

Answer C

Marks 1

Unit III-A3

Id

Question Velocity of flow is independent of temperature & pressure, when

the flow is

A Unsteady through unchanged cross-section.

B Steady through changing cross-section.

C Steady and the cross-section are unchanged.

D Unsteady and the cross-section is changed.

Answer C

Marks 1

Unit III-A3

Id

Question A fluid element has a velocity V = (-y2 .x)i + (2yx

2 ). j. The

motion at (x, y) = (l/2, 1) is a possible case of

A rotational

B Irrotational

C Irrotational and compressible

D Irrotational and incompressible

Answer B

Marks 1

Unit III-A3

Id

Question An equipotential line is __________ to the streamline at every

point.

A Normal

B Parallel

C Tangential

D None of these

Answer A

Marks 1

Unit III-A3

Id

Question Steady fluid flow occur when the derivative of flow variables

satisfy the following condition.

A ∂v/dt=0

B dv/dt=1

C dx/dt=0

D dt/ds=0

Answer A

Marks 1

Unit III-A3

Id

Question Unsteady non-uniform flow is represented by flow through an

A Long pipe at constant rate.

B Long pipe at decreasing rate

C Expanding tube at increasing rate.

D Expanding tube at constant rate.

Answer C

Marks 1

Unit III-A3

Id

Question Uniform fluid flow occurs, when the derivative of the flow

variables satisfy the following condition.

A ∂s/dt=0

B dv/dt=0

C dx/dt=0

D dt/ds=0

Answer A

Marks 1

Unit III-A3

Id

Question A flow through an expanding tube at constant rate is called

A Steady uniform flow

B Steady non-uniform flow

C Unsteady uniform flow

D Unsteady non-uniform flow

Answer B

Marks 1

Unit III-A3

Id

Question The continuity equation

A Expresses the relationship between work and energy

B Relates the momentum per unit volume between two points on a

stream line

C Relates mass rate of flow along a stream line

D Requires that Newton's second law of motion be satisfied at every

point in fluid.

Answer C

Marks 1

Unit III-A3

Id

Question If u, v, w are the components of the velocity V of a moving

particle, the equation represents

A One-dimensional flow

B Two dimensional flow

C Three dimensional flow

D None of these

Answer C

Marks 1

Unit III-A3

Id

Question A flow, in which the quantity of liquid flowing per second is

constant, is called __________ flow.

A Steady

B Streamline

C Turbulent

D Unsteady

Answer A

Marks 1

Unit III-A3

Id

Question For steady flow of a perfect fluid through a contracted section in a

horizontal tube, which of the following statements are true

A The mass flow rate is the same inside and outside the contracted

section.

B The pressure is higher inside the contracted section

C The fluid slows down as it passes through the contracted section

D None of the above

Answer A

Marks 1

Unit III-A3

Id

Question The resistance wire used in a hot wire anemometer for conducting

electrical current is made of

A Copper

B Tungsten

C Chromium

D Aluminum

Answer B

Marks 1

Unit III-A3

Id

Question A steady uniform flow is through

A A long pipe at decreasing rate

B A long pipe at constant rate

C An expanding tube at constant rate

D An expanding tube at increasing rate

Answer B

Marks 1

Unit III-A3

Id

Question Pick out the wrong statement about a streamline.

A It is always parallel to the main direction of the fluid flow

B It is a line across which there is no flow and it is equivalent to a

rigid boundary.

C Streamlines intersect at isolated point of zero velocity and infinite

velocity.

D The mass of fluid between any two streamlines can be considered

constant

Answer C

Marks 1

Unit III-A3

Id

Question Steady non-uniform flow is exemplified by flow through an

A Long pipe at constant rate.

B Expanding tube at increasing rate.

C Expanding tube at constant rate.

D None of above

Answer C

Marks 1

Unit III-A3

Id

Question If velocities of fluid particles vary from point to point in

magnitude and direction, as well as from instant to instant, the

flow is said to be

A Laminar

B Turbulent flow

C Uniform flow

D Non-uniform flow

Answer B

Marks 1

Unit III-A3

Id

Question What type of motion the fluid element undergoes, when it changes

from one position to another position, such that the angle between

the two sides changes in direction?

A Rotation

B Translation

C Linear deformation

D Angular deformation

Answer D

Marks 1

Unit III-A3

Id

Question Uniform flow is said to occur when

A Size and shape of the cross-section in a particular length remain

constant

B Size and shape of the cross-section change along a length

C Frictional loss in the particular length of the pipe will the more

than the drop in its elevation

D Frictional loss in the particular length of the pipe, will be less than

the drop in elevation.

Answer A

Marks 1

Unit III-A3

Id

Question In which type of fluid flow, the velocity of flow of fluid changes

from point to point in the fluid?

A Rotational

B Unsteady

C Turbulent

D Non-uniform

Answer D

Marks 1

Unit III-A3

Id

Question The continuity equation in ideal fluid flow states that

A Net rate of flow into any small volume must be zero.

B Energy is not constant along a streamline.

C There exists a velocity potential.

D None of above

Answer A

Marks 1

Unit III-A3

Id

Question Equation of continuity of flow is based on the principle of

conservation of

A Mass

B Momentum

C Force

D None of these.

Answer A

Marks 1

Unit III-A3

Id

Question In steady flow, which one of the following changes with time

A Velocity

B Pressure

C Density

D None of these.

Answer D

Marks 1

Unit III-A3

Id

Question 'Flow net' analysis cannot be applied to

A Region close to boundary where viscosity effects are predominant

B Sharp turns

C When flow is Turbulent

D Rotational flow

Answer A

Marks 1

Unit III-A3

Id

Question Pick up the correct statement from the following :

A In incompressible flow the density of a fluid remains constant

B In compressible flow, the density of a fluid changes from point to

point

C In uniform flow, the velocity of a fluid does not change with

respect to length of flow direction

D All the above.

Answer D

Marks 1

Unit III-A3

Id

Question The line traced by a single fluid particle as it moves over a period

of time is called __________ line.

A Stream

B Path

C Equipotential

D None of these

Answer B

Marks 1

Unit III-A3

Id

Question A stream tube is that, which has __________ cross-section

entirely bounded by stream lines.

A A circular

B Any convenient

C A small

D A large

Answer B

Marks 1

Unit III-A3

Id

Question Equation of continuity for 1-D flow is applicable when,

A Flow is steady

B Flow is one dimensional

C Velocity is not uniform over the cross-sections

D All the above.

Answer D

Marks 1

Unit III-A3

Id

Question The imaginary line drawn such that the tangents at its all points

indicate the direction of the velocity of the fluid particles at each

point, is called

A Path line

B Stream line

C Potential line

D Streak line.

Answer B

Marks 1

Unit III-A3

Id

Question One dimensional flow implies

A Steady uniform flow.

B Unsteady uniform flow.

C A flow which does not account for changes in transverse direction.

D None of above

Answer C

Marks 1

Unit III-A3

Id

Question In two dimensional flow the components of velocity are given by

u = ax; v = by. The stream lines will be

A Parabolic

B Circular

C Hyperbolic

D Elliptical.

Answer C

Marks 1

Unit III-A3

Id

Question The flow is called rotational if its velocity normal to the plane of

area is equal to

A Angular velocity vector

B Twice the angular velocity vector

C Thrice the angular velocity vector

D None of these.

Answer B

Marks 1

Unit III-A3

Id

Question The continuity equation in fluid mechanics utilizes the principle

of conservation of

A Momentum

B Mass

C Energy

D Both (b) & (c)

Answer B

Marks 1

Unit III-A3

Id

Question The flow of a liquid through tapering pipe at a constant rate is an

example of __________ flow.

A Steady uniform

B Steady non uniform

C Unsteady uniform

D Unsteady non uniform

Answer B

Marks 1

Unit III-A3

Id

Question A flow, whose streamline is represented by a straight line, is called

_________dimensional flow.

A One

B Two

C Three

D Four

Answer A

Marks 1

Unit III-A3

Id

Question Velocity at a certain point in case of streamline flow is

A Constant

B Independent of time

C Both (a) & (b)

D Neither (a) nor (b)

Answer C

Marks 1

Unit III-A3

Id

Question According to equation of continuity,

A w1a1 = w2a2

B w1v1 = w2v2

C a1v1 = a2v2

D a1/v1 = a2/v2

Answer C

Marks 1

Unit III-A3

Id

Question In frictional fluid flow, the quantity of fluid, is

A Constant along a streamline.

B Not constant along a streamline.

C Increased in the direction of flow.

D None of the above

Answer B

Marks 1

Unit III-A3

Id

Question The continuity equation

A Is independent of the compressibility of the fluid

B Is dependent upon the viscosity of the fluid.

C Represents the conservation of mass.

D None of these.

Answer C

Marks 1

Unit III-A3

Id

Question The flow of water through the hole in the bottom of a wash basin

is an example of

A Steady flow

B Uniform flow

C Free vortex

D Forced vortex

Answer C

Marks 1

Unit III-A3

Id

Question A flow in which the quantity of liquid flowing per second is not

constant, is called

A Streamline flow

B Turbulent flow

C Steady flow

D Unsteady flow

Answer D

Marks 1

Unit III-A3

Id

Question Streamline is a line in flow field,

A That is traced by all the fluid particles passing through a given

point.

B Along which a fluid particle travels.

C Such that at every point on it, the velocity is tangential to it.

D None of these.

Answer C

Marks 1

Unit III-A3

Id

Question Potential function is applicable only for __________ flow.

A Irrotational

B Turbulent

C Steady

D None of these

Answer A

Marks 1

Unit III-A3

Id

Question The property of steam function ψ is

A constant everywhere on any stream line

B The rate of change of ψ with distance in an arbitrary direction, is

proportional to the component of velocity normal to that direction

C The velocity vector may be found by differentiating the stream

function

D All the above.

Answer D

Marks 1

Unit III-A3

Id

Question A three dimensional flow is one in which

A The flow region has a width ,depth and length

B The velocity vector is inclined such that it can be resolved into

three mutually perpendicular directions

C The fluid moves in straight paths parallel to the main direction of

flow

D The velocity distribution over parallel planes is identical

throughout the flow region

Answer B

Marks 1

Unit III-A3

Id

Question A stream tube is one

A which is bounded by a closed surface containing the streamlines

B which has constant area throughout its length so that the velocity

remains constant

C in which the flow cannot cross the bounding surface

D Both A and C

Answer D

Marks 1

Unit III-A3

Id

Question Normal acceleration in fluid flow situations exists only when

A the streamlines are straight and parallel

B the flow is two dimensional

C the streamlines are curved

D the flow is unsteady

Answer C

Marks 1

Unit III-A3

Id

Question Irrational flow is characterized as the one in which

A the fluid flows along a straight path

B the fluid does not rotate as it moves along

C the net rotation of fluid particles about their mass centres remains

zero

D the streamlines of flow are curved and closely spaced

Answer C

Marks 1

Unit III-A3

Id

Question The existence of velocity potential in fluid flow indicates that

A the flow must be Irrotational

B the flow is rotational and satisfies the continuity equation

C the vorticity must be zero

D All of above

Answer C

Marks 1

Unit III-A3

Id

Question The concept of stream function which is based on the principle of

continuity and is applicable to

A three-dimensional flow

B Two-dimensional flow only

C Uniform flow cases only

D For all types of flow

Answer B

Marks 1

Unit III-A3

Id

Question Streamlines in fluid flow are

A Equipotential lines along which the velocity potential Φ= constant

B Lines along which the stream function Ψ = constant

C Lines along which the vorticity is zero

D None of above

Answer B

Marks 1

Unit III-A3

Id

Question A flownet is a graphical representation of streamlines and

equipotential lines such that

A These lines indicate the direction and magnitude of velocity

vector

B These lines intersect each other orthogonally forming curvilinear

squares

C These lines intersect each other at various different angles forming

irregular shaped nets

D The velocity potential Φ increases in the direction of flow.

Answer B

Marks 1

Unit III-A3

Id

Question Streamline, pathline and streakline are identical when

A The flow is uniform

B The flow is steady

C The flow is unsteady

D The flow is neither steady nor uniform

Answer B

Marks 1

Unit III-A3

Id

Question The mass acceleration is zero for a

A steady flow

B steady and uniform flow

C unsteady and uniform flow

D unsteady and non-uniform flow

Answer B

Marks 1

Unit III-A3

Id

Question A control volume implies

A an isolated system

B a closed system

C a specific mass in a fluid flow

D a fixed region in space

Answer D

Marks 1

Unit III-A3

Id

Question If an incompressible liquid is continuously flowing through a pipe,

the quantity of liquid passing per second is different at different

sections.

A True

B False

C Depends on pipe size

D Can't say

Answer B

Marks 1

Unit III-A3

Id

Question In a steady flow of a fluid , the total acceleration of any fluid

particle

A can be zero

B is never zero

C is always zero

D is independent of coordinates

Answer A

Marks 1

Unit III-A3

Id

Question For an irrotational flow, the equation 0

2

2

2

2

yx

is given by...

A Cauchy-Riemann

B Reynold

C Laplace

D Bernoulli.

Answer C

Marks 1

Unit III-A3

Id

Question A fluid particle may possess the displacement of…

A translation

B rotation

C distortion

D all the above.

Answer D

Marks 1

Unit III-A3

Id

Question If u, v, w are the components of the velocity v of a moving

particle, the equation

u v w

dx dy dz represents…

A one dimensional flow

B two dimensional flow

C three dimensional flow

D none of these.

Answer C

Marks 1

Unit III-A3

Id

Question ... used to describe the motion of fluid.

A Eulerian method

B Langrangian method

C both (a) and (b)

D none of these.

Answer C

Marks 1

Unit III-A3

Id

Question ... is branch of fluid mechanics which deals with the study of

velocity and acceleration of the particles of fluid in motion and

their distribution in space without considering any force or energy.

A Fluid Dynamics

B Fluid Kinematics

C Fluid Statics

D none of these.

Answer B

Marks 1

Unit III-A3

Id

Question An observer sitting on the bank of a river and studying the

movement of fluid particle or floating body is a example of …

A Eulerian method

B Langrangian method

C both (a) and (b)

D none of these.

Answer A

Marks 1

Unit III-A3

Id

Question An observer sitting in moving boat and studying the flow is a

example of …

A Eulerian method

B Langrangian method

C both (a) and (b)

D none of these.

Answer B

Marks 1

Unit III-A3

Id

Question The shortcomings of the Langrangian method to describe the

motion of fluid are…

A Cumbersome and Complex

B Equation of motion are very difficult to solve

C The motion of fluid is hard to understand

D All of the above.

Answer D

Marks 1

Unit III-A3

Id

Question Out of the following which method is used exclusively in fluid

mechanics to describe the motion of fluid, especially because of

its mathematical simplicity?

A both (b) and (c)

B Langrangian method

C Eulerian method

D none of these.

Answer C

Marks 1

Unit III-A3

Id

Question The acceleration of fluid particle consists of …..

A both (b) and (c)

B connective acceleration

C local acceleration

D none of these.

Answer A

Marks 1

Unit III-A3

Id

Question The equation of continuity expressed in the form of Cartesian

coordinates is…..

A () () ()0

u v w

t x y z

B () () ()0

u v w

t x y z

C () () ()0

u v w

t x y z

D none of the above.

Answer A

Marks 1

Unit III-A3

Id

Question …..is scalar function of space and time such that its negative

derivative w.r.t. any direction gives the fluid velocity in that

direction.

A Φ

B Ψ

C both (a) and (b)

D none of the above.

Answer A

Marks 1

Unit III-A3

Id

Question Any function Φ satisfies the … equation is a possible irrotational

flow (potential flow) case since the continuity is satisfied.

A Euler’s

B Bernoulli’s

C Newton’s

D Laplace.

Answer D

Marks 1

Unit III-A3

Id

Question Which of the following equation represents the possible case of an

irrotational flow?

A 2 2

xy yx

B 2 2

xy yx

C 2 2

0xy yx

D both (a) and (b).

Answer A

Marks 1

Unit III-A3

Id

Question The mathematical expression ( ) 1u v

v u shows that...

A stream lines and equipotential lines do not meet orthogonally

B stream lines and equipotential lines meet orthogonally

C both (a) and (b)

D None of the above.

Answer B

Marks 1

Unit III-A3

Id

Question Which of the following method is used to draw the Flow net?

A Analytical method

B Electrical analogy method

C Graphical method

D All the above.

Answer D

Marks 1

Unit III-A3

Id

Question The flow through a irrigation canal is a example of ….

A Steady flow

B Unsteady flow

C Uniform flow

D Non-uniform.

Answer A

Marks 1

Unit III-A3

Id

Question The flow around a uniform diameter pipe-bend or canal bend is a

example of ….

A Steady flow

B Unsteady flow

C Uniform flow

D Non-uniform.

Answer D

Marks 1

Unit III-A3

Id

Question The flow in pipe where average flow parameters are considered

for analysis” is a example of ….

A One dimensional flow

B Three dimensional flow

C Both (a) and (b)

D Two dimensional flow.

Answer A

Marks 1

Unit III-A3

Id

Question The flow between parallel plate of infinite extent is a example of

….

A One dimensional flow

B Three dimensional flow

C Both (a) and (b)

D Two dimensional flow.

Answer D

Marks 1

Unit III-A3

Id

Question The flow in the main stream of a wide river is a example of ….

A One dimensional flow

B Three dimensional flow

C Both (a) and (b)

D Two dimensional flow.

Answer D

Marks 1

Unit III-A3

Id

Question The flow near the solid boundaries is a example of ….

A rotational

B irrotational

C Uniform

D Two dimensional flow.

Answer A

Marks 1

Unit III-A3

Id

Question The motion of liquid in a rotating tank is a example of ….

A Two dimensional flow

B irrotational flow

C Uniform flow

D rotational flow

Answer D

Marks 1

Unit III-A3

Id

Question The flow above drain hole of a stationary tank or a wash basin is a

example of ...

A Two dimensional flow

B irrotational flow

C Uniform flow

D rotational flow

Answer B

Marks 1

Unit III-A3

Id

Question Ground water flow is a example of ….

A Two dimensional flow

B Uniform flow

C Rotational flow

D Laminar flow.

Answer D

Marks 1

Unit III-A3

Id

Question Flow in natural streams, artificial channel, water supply pipes,

sewer are the example of…

A Turbulent flow

B Uniform flow

C Rotational flow

D Laminar flow.

Answer A

Marks 1

Unit III-A3

Id

Question In experimental work often a colour or dye or some other

substance (such as smoke in case of gases) is injected into the

flowing fluid, in order to trace the motion of the fluid particles.

The resulting trail of colour is known as a …

A Stream line

B Stream tube

C Path line

D Streak line.

Answer D

Marks 1

Unit III-A3

Id

Question To study the basic principles of fluid flow; a definite volume with

fixed boundary shape is chosen in space along the fluid flow

passage, this volume is known as….

A Stream volume

B Control volume

C Proper volume

D Streak volume.

Answer B

Marks 1

Unit III-A3

Id

Question If the fluid particles move in straight lines and all the line are

parallel to thesurface, the flow is called

A steady

B uniform

C compressible

D laminar

Answer D

Marks 1

Unit III-A3

Id

Question If the velocity in a fluid flow changes with respect to length of

direction of flow, it is called

A unsteady flow

B compressible flow

C irrotational flow

D none of the above

Answer D

Marks 1

Unit III-A3

Id

Question Irrotational flow means

A fluid does not rotate while moving.

B fluid moves in straight lines.

C net rotation of fluid particles about their mass centres is zero.

D none of the above.

Answer C

Marks 1

Unit III-A3

Id

Question If the Reynolds number of the flow is less than 2000, the flow is

said to be

A Laminar flow

B Transit

C Turbulent flow

D none of these

Answer A

Marks 1

Unit III-A3

Id

Question The acceleration of a fluid particle in the direction of x is given by

_

A ax=u ∂u/∂x+ v∂v/∂y + w∂w/∂z+∂u/∂t

B ax=u ∂u/∂x+ v∂u/∂y + w∂u/∂z+∂u/∂t

C ax=u ∂u/∂x+ u∂u/∂y + u∂u/∂z+∂u/∂t

D None of the above

Answer B

Marks 1

Unit III-A3

Id

Question The convective acceleration of fluid in the x-direction is given by

A u ∂u/∂x+ v∂u/∂y + w∂u/∂z

B u ∂u/∂x+ v∂v/∂y + w∂w/∂z

C u ∂u/∂x+ u∂v/∂y + w∂w/∂z

D ∂u/∂t+ ∂v/∂t + ∂w/∂t

Answer D

Marks 1

Unit III-A3

Id

Question ΔΨ between two stream lines represents

A head

B pressure

C velocity

D discharge

Answer D

Marks 1

Unit III-A3

Id

Question Stream lines and equipontential lines _

A form meshes of perfect squares

B are orthogonal wherever they meet

C can be determined mathematically for all boundary conditions

D can be drawn graphically for viscous flow around any boundary

Answer B

Marks 1

Unit III-A3

Id

Question If Ψ = x2- y

2 is the stream function in a 2D flow field, the

magnitude of resultant at point (2, 3) is,

A √52 unit

B √15 unit

C √5 unit

D √125 unit

Answer A

Marks 1

Unit III-A3

Id

Question A grid obtained by drawing a series of streamlines Ψ and

equipotential lines Φ is known as

A Stream line

B Path line

C Streak line

D Flow net

Answer D

Marks 1

Unit III-A3

Id

Question For a Irrotational flow, the velocity potential lines and the

streamlines are always

A coplanar

B inclined to the horizontal.

C parallel to each other

D orthogonal to each other

Answer A

Marks 1

Unit III-A3

Id

Question Stream lines and path lines always coincide in case of

A laminar flow

B uniform flow

C turbulent flow

D steady flow

Answer D

Marks 1

Unit III-A3

Id

Question Consider the flowing statements.

For a two-dimensional potential flow

1. Laplace equation for stream function must

be satisfied

2. Laplace equation for potential function

must be satisfied

3. Streamlines and equipotential lines are

perpendicular

4. Stream function and potential function

and not interchangeable.

Which of these statements are correct ?

A 1 and 4

B 2 and 4

C 1, 2 and 3

D 2, 3 and 4.

Answer C

Marks 1

Unit III-A3

Id

Question For a two-dimensional fluid element in x-y plane, the rotational

component is given as _

A ωz=1/2(∂v/∂x-∂u/∂y)

B ωz=1/2(∂u/∂x-∂v/∂y)

C ωz=1/2(∂u/∂x+∂v/∂y)

D ωz=1/2(∂v/∂x+∂u/∂y)

Answer A

Marks 1

Unit III-A3

Id

Question Circulation is defined as

A line integral of tangential component of velocity about a closed

path.

B line integral of velocity about any path

C integral of tangential component of velocity about a path

D line integral of velocity about a closed path

Answer A

Marks 1

Unit III-A3

Id

Question The flow to be steady is that

A the velocity does not change from place to place.

B the velocity changes at a point with respect to time.

C the velocity is constant at a point with respect to time

D none of the above

Answer C

Marks 1

Unit III-A3

Id

Question The rate of increase of velocity with respect to time at a given

point in a flow field is called

A material acceleration

B convective acceleration

C local acceleration

D none of these

Answer C

Marks 1

Unit III-A3

Id

Question The flow will be uniform if

A the velocity is constant at a point with respect to time.

B the velocity changes at a point with respect to time.

C none of the above.

D the velocity is constant in the flow field with respect to space

Answer D

Marks 1

Unit III-A3

Id

Question If the density of a fluid is constant from point to point in a flow

region, it is called

A incompressible flow

B steady flow

C uniform flow

D rotational flow

Answer A

Marks 1

Unit III-A3

Id

Question If the fluid particles move in a hapzard or zig-zag way, the flow

is called _

A turbulent

B unsteady

C non-uniform

D incompressible

Answer A

Marks 1

Unit III-A3

Id

Question The flow of blood in small veins is an example of

A Laminar flow

B Turbulent flow

C Transitional

D none of these

Answer A

Marks 1

Unit III-A3

Id

Question A flow whose streamline is represented by a curve, is called _

A two-dimensional flow

B one dimensional flow

C three dimensional flow

D four dimensional flow

Answer A

Marks 1

Unit III-A3

Id

Question The existence of velocity potential in fluid flow indicates that the

A circulation around any closed curve must have a finite value

B flow is rotational and satisfies the continuity equation

C vorticity must be non-zero.

D flow must be Irrotational

Answer D

Marks 1

Unit III-A3

Id

Question The local acceleration in the direction of x is given by

A ∂u/∂t

B u (∂u/∂x)

C u (∂u/∂x+∂u/∂t)

D None of the above

Answer A

Marks 1

Unit III-A3

Id

Question The rate of increase of velocity with respect to changes in the

position of fluid particle in a flow field is called _

A convective acceleration

B local acceleration

C material acceleration

D none of these

Answer A

Marks 1

Unit III-A3

Id

Question The general form of expression for the continuity equation in a

Cartesian coordinate system for incompressible or compressible 3-

D flow is given by _

A ∂ρ/∂t+ ∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =0

B ∂ρ/∂t+ ∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =1

C ∂u/∂x+∂v/∂y +∂w/∂z =0

D ∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =0

Answer A

Marks 1

Unit III-A3

Id

Question Vorticity in the z-direction is given by,

A 2(∂v/∂x-∂u/∂y)

B (∂u/∂x-∂v/∂y)

C (∂u/∂x+∂v/∂y)

D (∂v/∂x+∂u/∂y)

Answer A

Marks 1

Unit III-A3

Id

Question The velocity components in x and y directions in terms of

velocity potential Φ are

A u= - ∂Φ/∂x, v= - ∂Φ/∂y

B u= ∂Φ/∂x, v= - ∂Φ/∂y

C u= ∂Φ/∂y, v= ∂Φ/∂x

D u= - ∂Φ/∂x v= ∂Φ/∂y

Answer A

Marks 1

Unit III-A3

Id

Question The velocity components in x and y directions in terms of stream

function Ψ are

A u= - ∂Ψ/∂y, v= ∂Ψ/∂x

B u= ∂Ψ/∂x, v= ∂Ψ/∂y

C u= ∂Ψ/∂y, v= ∂Ψ/∂x

D u=- ∂Ψ/∂x, v= ∂Ψ/∂y

Answer A

Marks 1

Unit III-A3

Id

Question Which of the following statement is false for two-dimensional

flow field ?

A If Φ exists, Ψ will also exist

B If Ψ exists, Φ will also exist

C If Φ exists the flow will be rotational

D If Ψ exists flow will be either rotational or irrotational.

Answer D

Marks 1

Unit III-A3

Id

Question The relation ∂2Φ/∂x

2+∂

2Φ/∂y

2=0 for an irrotational flow is

referred to as

A Euler's equation

B Laplace equation

C Reynolds equation

D Cauchy-Reimann's equation.

Answer B

Marks 1

Unit III-A3

Id

Question Select the correct statement about equipotential line

A has a constant dynamic pressure

B connects the mid points of a flow cross section

C exists in case of rotational flows

D lies orthogonal to streamlines for the flow pattern

Answer D

Marks 1

Unit III-A3

Id

Question If a stream function exists for a flow field and it satisfies the

Laplace equation, then

A flow is rotational

B continuity equation is satisfied and the flow is Irrotational

C Flow is Irrotational but does not necessarily represent a possible

flow field

D the function represents a possible flow field but does not

necessarily satisfy condition for irrotational motion.

Answer B

Marks 1

Unit III-A3

Id

Question Which is not true in the context of velocity potential function ?

A is defined as the integral of the tangential velocity component

along a closed contour

B exists for irrotational motion of fluids whether compressible or

incompressible

C satisfies the Laplace equation

D lines of constant velocity potential

Answer A

Marks 1

Unit III-A3

Id

Question During motion, a fluid element is stated to undergo a change in

angle between adjacent sides when it moves from one position to

another. The type of motion is called

A linear deformation

B angular deformation

C rotation

D Circulatory motion.

Answer B

Marks 1

Unit III-A3

Id

Question Identify the statements pertaining to laminar flow

(1) fluid particles exhibit a regular pattern of flow

(2) fluid flows through a narrow passage

(3) momentum transfer is on macroscopic level

(4) the injection of smoke or dye fills the pipe

A 1 & 2

B 2

C 1

D 1 & 4

Answer A

Marks 1

Unit III-A3

Id

Question For an irrotational motion

A the fluid elements do not undergo a circular motion

B the velocity is constant at every point in the flow field

C the fluid particles do not rotate about their mass centres while

moving along a streamline

D the fluid elements do not experience any shear.

Answer C

Marks 1

Unit III-A3

Id

Question Flow is rotational if the

A fluid element undergoes 'linear deformation

B fluid element undergoes angular deformation

C fluid element undergoes net rotation in a plane about an axis

normal to the plane

D flow takes place in a circular path.

Answer C

Marks 1

Unit III-A3

Id

Question During the opening of a valve, the flow is

A laminar

B unsteady

C uniform

D rotational.

Answer B

Marks 1

Unit III-A3

Id

Question Mark the wrong statement:

A streamlines cannot start or end anywhere except at the interface or

infinity

B streamline spacing varies directly as the flow velocity

C streamlines can meet at a stagnation point where the velocity is

zero

D the flow is only possible in direction of falling velocity potential

Answer B

Marks 1

Unit III-A3

Id

Question For a two-dimensional flow field, the equation of a streamline is

given as

A u/dx=dy/v

B du/dx= dv/ dy/=0

C dy/u= dx/v

D dx/u= dy/v

Answer D

Marks 1

Unit III-A3

Id

Question The flow-net analysis can be used to determine

A quantity of seepage and upward lift press

B the efficient boundary shapes, for which the flow does not

separate.

C the velocity and pressure distribution for given boundaries of

flow (provided the velocity distribution and pressure at any

reference section are known).

D all of the above.

Answer D

Marks 1

Unit III-A3

Id

Question If velocity potential Φ satisfies the Laplace’s equation, it

represents the possible ..... flow.

A unsteady, compressible, rotational

B steady, compressible, irrotational

C unsteady, incompressible, rotational

D Steady, incompressible, irrotational.

Answer D

Marks 1

Unit III-A3

Id

Question ---------is defined as a scalar function of space and time such that

its negative derivative with respect to any direction gives the fluid

velocity in that direction.

A potential function

B Stream function

C Circulation

D Vorticity.

Answer A

Marks 1

Unit III-A3

Id

Question The motion is described as when the components of rotation or

vorticity are zero throughout certain point of the fluid.

A rotational

B irrotational

C either of the above

D None of the above

Answer B

Marks 1

Unit III-A3

Id

Question The concept of stream function which is based on the principle of

continuity is applicable to

A rotational flow only

B two-dimensional flow only

C three-dimensional flow

D uniform flow only.

Answer B

Marks 1

Unit III-A3

Id

Question -----is defined mathematically as the line integral of the tangential

velocity about a closed path (contour).

A circulation

B vorticity

C either of the above

D none of the above.

Answer A

Marks 1

Unit III-A3

Id

Question In a fluid-flow the stream lines are lines

A along which the vorticity is zero

B along which the stream function Ψ=constant

C which are parallel to the equipotential lines

D which exist in irrotational flow only.

Answer B

Marks 1

Unit III-A3

Id

Question . ...... is a curve which gives an instantaneous picture of the

location of the fluid particles which have passed through a given

point.

A Path line

B Stream line

C Streak line

D None of the above.

Answer C

Marks 1

Unit III-A3

Id

Question If the Reynolds number is more than 4000, the flow in a pipe is

A laminar flow

B turbulent flow

C transition flow

D none of the above.

Answer B

Marks 1

Unit III-A3

Id

Question High velocity flow in a conduit of large size is known as

A laminar flow

B turbulent flow

C either of the above

D none of the above

Answer B

Marks 1

Unit III-A3

Id

Question If the flow is Irrotational as well as steady it is known as

A non-uniform flow

B one-dimensional flow

C potential flow

D none of the above.

Answer C

Marks 1

Unit III-A3

Id

Question The flow in a pipe whose valve is being opened or closed

gradually is an example of

A steady flow

B unsteady flow

C rotational flow

D compressible flow.

Answer B

Marks 1

Unit III-A3

Id

Question Continuity equation for compressible fluid states that

A discharge at any section is constant

B discharge is different at different section

C density is constant at all sections along the flow

D none of the above.

Answer B

Marks 1

Unit III-A3

Id

Question When a highly viscous fluid flows at a slow velocity, the flow

becomes

A Laminar

B turbulent

C uniform

D steady.

Answer A

Marks 1

Unit III-A3

Id

Question A continuity equation for two-dimensional compressible flow is

given by

A (∂u/∂x)+(∂v/∂y)=0

B ∂/∂x(ρu)+ ∂/∂y(ρv)=0

C u∂u/∂y+v∂v/∂y=0

D U(∂ρ/∂x)+v(∂ρ/∂y)=0

Answer B

Marks 1

Unit III-A3

Id

Question A continuity equation given as ∂u/∂x+∂v/∂y+∂w/∂z=0

A is valid for steady flow whether the flow is compressible or

incompressible

B is not valid for incompressible, unsteady flow

C is valid for steady& incompressible flow

D is valid for ideal fluid flow only.

Answer C

Marks 1

Unit III-A3

Id

Question A flow has diverging straight stream lines. If the flow is steady,

the flow

A is uniform with local acceleration

B has convective tangential acceleration

C has convective normal acceleration

D has both convective normal and tangential accelerations.

Answer B

Marks 1

Unit III-A3

Id

Question The contraction area for flow through orifice in a tank depends on

A Shape of orifice

B Size of orifice

C Head in tank

D All of above

Answer D

Marks 1

Unit III-A3

Id

Question The discharge through an orifice fitted in tank can be increased

by

A Fitting a short length of pipe outside

B Sharpening edge of orifice

C Fitting a long pipe to the outside

D Fitting a long pipe to the inside

Answer A

Marks 1

Unit III-A3

Id

Question The path of jet discharging from bottom opening in a tank full of

water will be

A Horizontal straight line

B Linearly downwards

C Approximately hyperbola

D Parabola with its vertex at opening

Answer D

Marks 1

Unit III-A3

Id

Question In a pipe larger than 25mm,carrying water, the laminar flow,

A Very often exist

B Generally exist

C Rarely exist

D unpredictable

Answer C

Marks 1

Unit III-A3

Id

Question Flow of fluid of fluid in a pipe takes place from

A Higher level to lower level

B Higher pressure to lower pressure

C Higher energy to lower energy

D None of the above

Answer C

Marks 1

Unit III-A3

Id

Question Vorticity is given by

A Two time of rotation

B 1.5 times of rotation

C 3 times of rotation

D Equal to rotation

Answer A

Marks 1

Unit III-A3

Id

Question Study of fluid motion with the forces causing the flow is known

as

A Kinematics of fluid flow

B Dynamics flow

C Statics of flow

D Kinematics of fluid flow

Answer B

Marks 1

Unit III-A3

Id

Question Cipolleti weir is a trapezoidal weir having side slopes of

A 1 horizontal to 2 vertical

B 4 horizontal to 1 vertical

C 1 horizontal to 4 vertical

D 1 horizontal to 3 vertical

Answer C

Marks 1

Unit III-A3

Id

Questio

n

Francis formula for a rectangular weir for two end contraction is

given by

A Q= 1.84( L -0.2 x 2H) H5/2

B Q= 1.84 ( L -02H) H 3/2

C Q= 1.84 ( L -0.2 H)H 5/2

D None of the above

Answer B

Marks 1

Unit III-A3

Id

Question Irrotational flow means

A Fluid does not rotate while flowing

B Fluid moves in straight lines

C Net rotation of fluid particles about their mass centers is zero

D None of the above

Answer C

Marks 1

Unit III-A3

Id

Question For irrotational flow the velocity potential lines and stream lines

are always

A Parallel to each other

B coplanar

C Orthogonal to each other

D Inclined to horizontal

Answer B

Marks 1

Unit III-A3

Id

Question Irrotational flow occurs when

A Flow takes place in duct of uniform cross section at constant

mass flow rate

B Streamlines are curved

C There is no net rotation of fluid element about its mass center

D Fluid element does not undergo any change in shape or size

Answer C

Marks 1

Unit III-A3