BTCE28 - · PDF fileBTCE28 V SEMESTER B.TECH ... Q.6 Determine the shear stress in a 25...

BTCE28

V SEMESTER B.TECH EXAMINATION, JANUARY-2013

HYDROPOWER ENGINEERING

Time: 3 Hours Max. Marks: 75

GROUP A : Answer any three questions. (Question No. 1 is compulsory)

Q.1 Give classification of pumps. (05)

Q.2 A pelton wheel having a mean bucket diameter of 1.0 m is running at 1000

rpm. the net head on the pelton wheel is 700 m. If the side clearance angle is

15 and discharge through the nozzle is 0.1 m3/s, determine power available at

the nozzle-and hydraulic efficiency of the turbine. (10)

Q.3 What is a hydraulic turbine? How are hydraulic turbine classified? (10)

Q.4 The following data is available for a hydropower plant :

Available head = 130 m; Catchments area = efficiency = 220 sq. km; Annual

average rainfall = 150 cm; efficiency = 91% percolation and evaporation ,

losses = 18 %. Determine power developed in MW taking load factor as unity

(10)

Q.5 A jet of water impinges on a series of curved vanes at an angle of 30 to the

direction of motion of the vanes while entering and leaves the vanes

horizontally. The head under which the jet issues from the nozzle is 30 m, the

co-efficient of velocity for the nozzle is 0.9 and the diameter of the jet after

leaving the nozzle is 50 mm. the speed of the vane is 10 m/s and the relative

velocity of the water at outlet is 0.8 times the relative velocity at inlet.

i. The angle of vane tips at inlet.

ii. The power developed by the jet and

iii. The effieicnye of the system (10)

GROUP B : Answer any three questions. (Question No. 6 is compulsory)

Q.6 D.B Francis turbine & Kaplan turbine. (05)

Q.7 What is a unit hydrograph? What are the limitations to use U.H? (10)

Q.8 A valve is provided at the end of a cast iron pipe of dia 150 mm and Of

Thickness 10 mm. The water is flowing through the pipe, which Is Suddently

stopped by closing the valve, Find the maximum velocity Of Water, when the

rise of pressure due to sudden closure of valve is 196.2 N/cm2. Take k for

water as 19.62x104 N/cm

2. & for cast iron Pipe as 11.772x10

6 N/cm

2

calculate the circumferential stress & Longitudinal stress developed in the pipe

well. (10)

Q.9 What are the applications advantages & disadvantages of hydro-electric

Power plants. (10)

Q.10 A vertical shaft francis turbine runs at 420 r p m while the discharge is

15m3/sec. The Velocity and Pressure head at enterance of the runner are

10 m/s & 230 m resp. The elevation above the tail race is 5 m . The dia

of the runner is 2 m and the width at the inlet is 270 mm. The overall

& hydraulic efficiencies are 92 % & 98 % resp Calculate (10)

1. Total head across the turbine 2. Power output

GROUP C: All Questions are Compulsory.

Q.11 Fill in the blanks ( each question carry 2 marks)

(i) __________ will be formed if the net positive suction head requirement for the

pump is not satisfied.

(ii) Air vessels are used in a __________ to reduce acceleration head.

(iii) In impulse turbines the work is done by the change in the __________ of the

jet.

(iv) The number of buckets on the periphery of a Pelton wheel is given by ______

(v) __________ can work under any head.

Q.12 Multiple choice question. (Each question carry 2 marks)

(i) The maximum hydraulic efficiency of an impulse turbine is equal to

(a) 1

2

cos (b)

1

2

cos ( c)

1

2

Sin (d)

1

2

Sin

(ii) A Pelton wheel is an

(a) Axial flow impulse turbine (b) Inward flow impulse turbine

(c) Outward flow impulse turbine (d) All of these

(iii) The power produced by a reaction turbine is

(a) Directly proportional to H

(b) Inversely proportional to H

(c) Directly proportional to H

(d) Inversely proportional to H

(iv) In a Francis’ turbine runner, the number of blades are generally

(a) 2 to 4 (b) 4 to 8 ( c) 8 to 16 (d) 16 to 24

(v) In the casing of a centrifugal pump the kinetic energy of the water is

converted to

(a) Potential energy (b) Pressure energy

(c) Heat energy (d) All of these

Q.13 True or false (each question carry 1 marks).

(i) Overall capital expenditure for a hydropower station is low.

(ii) The process by which water is released to the atmosphere by the plants is

called evaporation.

(iii) Water wheels are suitable for low water heads.

(iv) The hydraulic efficiency of a 6 (six) reaction turbine is the ratio of work done

on the wheels to the head of water.

(v) The slip of a reciprocating pump is the difference of theoretical discharge and

actual discharge.

******

BTCE33


DESIGN OF RC STRUCTURE



Q.1 Design a circular overhead water tank of 200 kL capacity over a staging of 25

m. Assume suitable proportions and prepare detailed structural drawings. (05)

Q.2 Write a user friendly computer program to design torsion reinforcement in

rectangular and flanged beams, and plot the cross-sectional reinforcement

details on a graphic plotter. (10)

Q.3 An isolated T-beam has a 150 cm wide flange which is 10 cm thick. The web

is 25 cm. Determine effective width of the flange, if

(a) This beam is simply supported having 7 m effective span,

(b) This beam is continuous having 7 m effective span. (10)

Q.4 Design a clear water reservoir of 2000 kL capacity. It is square in plan and

completely under-ground. The depth of the tank should not be more than 6 m.

the net bearing capacity of the earth is 100 kN/m2 and depth of water table is

3m. Assume necessary data and prepare detailed drawings. (10)

Q.5 What are the different limit states of design? What are the merits of limit state

design philosophy over other design philosophies? (10)


Q.6 Determine the shear stress in a 25 × 50 cm rectangular section if the shear

force is 20 KN and torsional moment is 10 KN m at service loads. Assume

M20 mix and 0.75% tension reinforcement at an effective cover of 50 mm.

(05)

Q.7 Discuss the Salient features of working Stress method & Ultimate load

Method. (10)

Q.8 Design a short column under biaxial bending with the following data

Size of Column = 45 × 45 cm

Concrete grade = M15

Steel grade = Fe415

Factored load Pu = 1000 KN

Factored laod Mux = 75 KN m

Muy = 60 KN m

Moments due to minimum eccentricity are less than the values given

above Reinforcement is equally distributed on four sides. (10)

Q.9 Design a beam 40 cm × 60 cm subjected to an bending moment of 150 KN m,

twisting moment of 20 KN/m and a shear force of 100 KN at collapse. Use

M25 mix & Fe 415 grade steel. (10)

Q.10 Give the step by step procedure to design a Pile foundation. (10)


Q.11 Fill in the blanks (each question carries 2 marks)

(i) A ____________ is the extension of a combine footing for a row of

columns.

(ii) In reinforced concrete floors. Movement joints should be spaced at not

more than ________ meters apart in two directions at right angles.

(iii) ______________ joint is a movement joint with a deliberate

discontinuity but no initiate gap between the concrete on either side of

the joint.

(iv) Effective height of a column of a framed structure depends on the

_______ of the column and various beams framing into the columns at

its two ends.

(v) Shear force is present in beams where there is a change in __________

along the span.

Q.12 Multiple choice question. (Each question carries 2 marks)

(i) The limiting valves of the depth of neutral axis Xm for different grades of

steel? (5)

(a) 0.002 y/Es 0.876

0.0035

Xmd

Xm

(b) 0.002 0.8756y/Es

0.0035

dXm

Xm

(c) 0.002 y/Es 0.876

0.0035

Xmd

Xm

(d) 0.002 y/Es 0.876

0.0035

Xmd

Xm

(ii) The moment of resistance is calculated by the following equation. (10)

(a) x = b 36.0

At 86.0

ck

y (b) x =

b 36.0

At 87.0

ck

y

(c) x= b 40.0

At 87.0

ck

y (d) x =

b 36.0

At 87.0

ck

y

(iii) Minimum tension reinforcement should not be less them that given by the

following. (10)

(a) y

0.85

bwd

Ao (b)

bw

0.85

bwd

Ao

(c) y

0.85

bwd

Ao (d)

0.85

y

bwd

Ao

(iv) Percent of tension steel p is equal to (10)

(a) b

At100 (b)

bd

At100

(c) bd

At

100 (d)

bd

At

(v) The wall is of plain concrete and provides stability of its weight.

(a) Gravity (b) Cantilever

(c) Butress (d) Conterfort

Q.13 True or false (each question carries 1 mark).

(i) Upto four stories, brick walls may be relied upon to resist successfully

earthquake or wind forces acting on the building with load bearing or filler

walls .

(ii) The base slab supports the wall and rests on soil .

(iii) Retaining walls and always designed to retain saturated earth fill.

(iv) Reinforced concrete walls in buildings are required to carry vertical loads s

well as lateral loads.

(v) A doubly reinforced concrete section is reinforced in both compression and

tension regions.

******

BTCE34


FOUNDATION ENGINEERING

Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory)

Q.1 Write a type of samplers. (05)

Q.2 A vane, 10 cm long and 8 cm in diameter, was pressed into soft clay at the

bottom of a bore hole. Torque was applied and gradually increased 45 N-m

when failure took place. Subsequently the vane rotated rapidly so as to

completely remould the soil. The remoulded soil was sheared at a torque of

18 N-m. Calculate the chohesion of the clay in the natural and remoulded

states and also the value of sensitivity. (10)

Q.3 A retaining wall 5 metres high with a sloping back at 10 to the vertical

supports a choesionless backfill rising from the crest at an angle of 5 with the

horizontal. The backfill weighs 19 kN/m3 and carries a uniformly distributed

load of 5 kN/m2. The angle of shearing resistance of the backfillis 30 and the

angle of wall friction is 30 . Find by Rebhann’s graphical method the total

active pressure per metre. (10) (10)

Q.4 During a consolidation test, a sample of fully saturated clay, 2.0 cm thick is

consolidated under a pressure increment of 200 kN/m2. When equilibrium is

reached, the sample thickness gets reduced to 1.78 cm. the pressure is then

removed and the sample is allowed to expand and take water. The final

thickness is observed as 1.95 cm and final water content is 25% , if G = 2.72,

find voids ratio before and after consolidation. Also find mv over the range o

pressure applied. (10) (10)

Q.5 A field pumping-out test has the following data: (10)

i. Diameter of the well = 20 cm

ii. Thickness of confined aquifer = 30 m

iii. Radius of circle of influence = 350 m

iv. Drawdown during the test = 5 m

Pump discharge = 0.08 cumecs (10)


Q.6 Explain one dimensional consolidation. (05)

Q.7 Two clay specimens A and B of thickness 2cm & 3cm, have equilibrium voids

ratio 0.68 and 0.72 resp. under a pressure of 200Kn/m2. If the equilibrium

voids ratio of the two soils reduced to 400Kn/m2. Find the ratio of the co-

efficient of permeability of the two specimens. The time required by the

specimen A to reach 40 percent degree of consolidation is ¼ of that required

by specimen B for reaching 40% degree of consolidation. (10)

Q.8 Explain Direct shear test. (10)

Q.9 A 6m high vertical wall supports a saturated, cohesive backfill (Ø = 0). With

horizontal surface. The top 3m of the back fills weighs 18KN/m3 & has

apparent cohesion of 18kn/m2. The bulk unit weight & apparent cohesion of

the bottom 3m of the backfill are 20kn/m3 & 24 kn/m

2 resp. What is the likely

depth of tension cracks behind the wall? If tension cracks develops, what will

be the total active pressure? Draw the pressure distribution diagram. (10)

Q.10 State various methods of the soil explorations and describe boring methods in

details. (10)



(i) Well foundation comes under the category of ________ foundation.

(ii) Bulk density is the ratio of _______ of soil per unit.

(iii) The line within a dam section below which these are positive hydrostatic

pressure in the dam is called as _______ line.

(iii) Gravels is classified as ________ soil.

(iv) The total head at any point in the soil mass consists of three heads they are

________, ________, ________.


(i) Foundations for building on sandy soil must have depth for at least

(a) 0.1m (b) 0.5m (c) 0.8 to 1m (d) to 5m.

(ii) The value obtained for a soil sample from a shear test is known as:

(a) Angle of repose (b) Horizontal plane

(c) Angle of internal friction (d) Angle of shearing resistance.

(iii) Specific gravity is ratio of

(a) w/ s (b) s/ w (c) Vs /Vr (d) sub/ sat

(iv) Consolidation is a process of

(a) Air removal (b) Volume reduction

(c) Voids removal (d) Voids & Air removal.

(v) Optimum moisture content is the moisture content at which

(a) Settlement is maximum (b) Permeability is more

(c) Dry density is maximum (d) Shear strength is less.


(i) Vane shear test is used to determine the undrained shear strength of cohesion

soil.

(ii) The failure of a pile foundation is due to local shear

(iii) The C and parameters of soil are unique for that soil.

(iv) Isobar is a curve of soil is continued basically of cohesion or adhesion

between the surface of the paricles.

(v) Compaction can be achieved by rolling, tamping or vibration.

******

BTCE35 V SEMESTER B.TECH EXAMINATION, JANUARY-2013

RIVER ENGINEERING



Q.1 What are the types of tracers? Estate their properties. (05)

Q.2 Describe the slope area method of measurement of flood discharge in stream.

(10)

Q.3 Explain briefly Clark’s method in development of IUH. (10)

Q.4 Write short note on (10)

(a) Electromagnetic method

(b) Ultrasonic method

Q.5 Describe use of the mass curve to estimate the storage requirement of a

reservoir to meet a demand pettern. What are the limitation of flow mass

curve. (10)


Q.6 Describe the various structural methods adopted for control of floods. (05)

Q.7 Explain the rational method of computing the peak discharge of a

small catchment. Where is it commonly used and what are tits merits and

demerits. (10)

Q.8 Describe briefly the moving boat method of stream flow measurement. (10)

Q.9 List the factors affecting the seasonal and annual runoff of a catchment.

Describe briefly the interactions of the factors listed by you. (10)

Q.10 The storage evaluation-discharge characteristics of a reservoir is as follows :

(10)

Elevation (m) 100.00 100.50 101.00

Discharge (m3/s) 12 18 25

Storage (103 x m

3) 400 450 550



(i) Unique hydrograph is hydrograph showing a rainfall excess of ________.

(ii) Time of concentration tc for a small catchment is given by ________.

(iii) Runoff coefficient is a parameter having ________ unit.

(iv) Aridity index AI is defined as ________.

(v) Double mass curve is a method used for measuring the _______ of a rain

gauge station.


(i) Gumble property method is used for estimating

(a) Peak flood (b) Rainfall

(c) evaporation (d) Infiltration.

(ii) Standard project flood is a flood which has a relation of

(a) SPF is > PMP (b) SPF = PMP (c) SPF < PMP (d) PMP < SPF

(iii) Station year method is a method used for estimating the rainfall of an

area which are considered to be:

(a) Meterologicaly same (b) Meterologicaly different.

(c) Hydrologicaly same (d) Hydrologicaly different

(iv) Isohyets are the lines joining the places having:

(a) Same rainfall (b) same infiltration

(c) Same evaporation (d) none

(v) Isobars are places having;

(a) Same atmospheric pressure (b) same temperature

(c) Same rainfall (d) none


(i) Iylish method is a method used for peak flood

(ii) Envelop method is a method is applicable all over the world.

(iii) ‘S’ curve hydrograph is a hydrograph which shows unique excessrainfall.

(iv) Acityl alcohol is a compound used to reduce the evaporation rate.

(v) hydrograph is a curve which gives discharges Vs time.

******

BTCE37,BTME37


OPERATION RESEARCH



Q.1 Discuss the significance and scope of OR in modern management. (05)

Q.2 What is travelling sales man model. (10)

Q.3 Explain esquecing problem in proper details. (10)

Q.4 What is assignment problem? Give two areas of its application. (10)

Q.5 State the assumption made in sequencing? (10)


Q.6 Explain the primal-dual relationship. (05)

Q.7 Describe the transportation problem with its general mathematical

formulation. (10)

Q.8 Write a short note on degeneracy in transportation problem. (10)

Q.9 What is assignment problem? Give two areas of its application. (10)

Q.10 What purpose is served by including dummy activities in network diagram?

(10)



(i) Operation Research introduce __________ into decision analysis.

(ii) In queuing theory __________ distribution is denoted by M.

(iii) North West Corner Method is used for __________ problem

(iv) CPM stands for __________.

(v) __________ is an event oriented technique.


(i) Queuing theory is associated with

(a) Inventory (b) Sales

(c) sales (d) production

(ii) The expected time is given by

(a) te = (t0 + 4tm + tp) / 6 (b) te = (4t0 + tm + tp) / 6

(c) te = (t0 + tm + 4tp) / 6 (d) te = (to + tm + tp)

(iii) Optimization can be applied to

(a) Linear programming (b) Transportation

(c) Assignment (d) Routing

(iv) Recorder Level is given by

(a) Lead time demand + safety stock (b) EOQ + Lead Time demand

(c) Safety stock + EOQ (d) None of the above

(v) Hungarian method is used for

(a) LPP (b) Material handling

(c) Assignment Problem (d) Queuing problem


(i) Stock may be positive, zero or negative.

(ii) CPM is an event oriented technique.

(iii) Vogel’s Approximation Method is used for Transportation Problem.

(iv) PERT is activity oriented

(v) If the behaviours of the system depends on the time it is said to be in steady

state.

******

BTCE38P-I

V SEMESTER B TECH IN CIVIL ENGINEERING

EXAMINATION JANUARY-2013

DESIGN OF RC STRUCTURES I

Time: 1 hours (5X5=25)

PART - A

Instructions: 1) ANSWER ALL QUESTIONS.

1. What are the different limit states of design? What are the merits of limit state design

philosophy over other design philosophies?

2. Find the moment of resistance of a beam 25 cm by 50 cm deep if it is reinforced with

2-12 mm bars in compression zone and 4-20 mm bars in tension zone, each at an

effective cover of 40 mm.

3. Explain flat slab system and grid slab system.

4. A T-beam of a roof is 75 cm deep upto centre of tension steel and has 140 cm

effective flange width. Its flange is 10 cm thick and web i9s 30 cm wide. Determine

the area of tension steel required to resist a moment of 100 kN safely. Assume M20

mix and HSD bars.

5. Design a circular column to carry an axial load of 1500 kN using

(i) lateral ties,

(ii) helical reinforcement. Use M25 mix and Fe 415 steel.

BTCE39P-II

V SEMESTER B TECH IN CIVIL ENGINEERING

EXAMINATION JANUARY-2013

FOUNDATION ENGINEERING

Time:1 hours (5X5=25)

PART - A

Instructions: 1) ANSWER ALL QUESTIONS.

1. Explain Soil as three phase system.

2. What is Specific Gravity & Density Index?

3. What are the factors affecting Compaction?

4. What are the modes of occurrence of water in soil?

5. What is mean by head gradient and potential?

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