Con. 54UU-U9. ~r-v' (REVISED COURS~)

(3 Hours)

~l"- I I jU

[Total Marks: 100

N.H.: (1) Question No.1 is compulsory.(2) Answer any four out of remaining six questions.(3) Assume any suitable data wherever required.

1. Answer any four of the following questions :-(i) State and prove with the help of a neat sketch Kcnnedy's theorcm of threc ccntrcs.

(ii) With thc help of a neat sketch explain any onc of the exact straight line mechanism.(iii) With thc hclp of a neat skctch explain law of gcaring.(iv) State and explain D' Alembert's principle with respect to kinetics of a rigid body.(v) State Grubler's criteria.Using the same, Dcdu,ceminimum number of links required

to form a mechanism.

20

2. (a) Fig. 1 shows the mechanism of a radial valve gear. Crank OA rotates uniformly at 14150 rpm and is pinned at A to rod AB. Point C is guided in the circular path withD as ccntre and DC as radius. Dimensions of the various links are :-

OA =150 mm ; AB = 550 mm; AC = 450 mm; DC = 500 mm; BE = 350 mm.Dctermine the velocity of the slider at E by :-

(i) Relative velocity method (ii) Instantaneous Centre method.

Q~~

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,.. '" -r--" ".. i ""-- - .... -5(~ -a..-(b) Dctcnnine moment ofInertia of a compound pendulum as shown in fig 2. The pendulum

consists of a disc suspendcd by a slender rod. Numcrical data regarding the pcndulumis given below :-

b=250mm; a=125mm; WI =0.225 kg; W2=IAkg.

6

3. (a) A rope drive transmits 100 kW at 225 rpm by ropes, each 25 mm diameter and 10density 6800 kg/m3.Maximumrope tension to be limited to 1500N and is designed for maximumpowerconditions, The angle of contact is 160° and coefficient of friction betwecn therope and the pulley is 0.2. Groove angle is 45°.Determine the diameter of pulley and number of ropes.

(b) The turning moment diagra'm of an engine consists of two isosceles triangles. 10Maximumheightof each trianglerepresentsturningmomentequal to 1000Nm, whilethe base of the triangle is from 8 = 0° to 180° and 8 =180° to 360°. If the engineruns at 200 rpm and if the total fluctuation of speed is not to exceed 3%, find-

(i) Indicated horse power of the engine and(ii) Moment of inertia of the flywheel.

[TURN OVER

4. (a) The following data relate to a pair of involute spur gears in mesh :-Teeth on pinion = 24Gear ratio = 2Pressure angle = 20°Module = 5 mm.Pitch velocity of pinion = 1.2 m/sec.

Determine the path of approach, path of recess and contact ratio, if the addendumis equal to one module.

(b) The driving shaft of a Hooke's joint has a uniform angular speed of 280 rpm.Detennine the pennissible angle between the axes of the shafts to pennit a maximumvariation of 8% of the mean speed.

12

8

5. (a) The following data relate to the connecting rod of a reciprocating engine :~Mass = 50 kg.Distance between bearing centres = 900 mm.Diameter of big end bearing = 100.mm.Diameter of small end bearing = 80 mm.Time of oscillationwhen the connectingrod is suspended from big end = 1.7'see.Time of oscillationwhenthe connectingrod is suspendedftom smallend = 1.85 sec.Determine :-

(i) The radius of gyration of the rod about an axis passing the centre of massperpendicular to the plane of oscillation.

(ii) The moment of inertia of the rod about the same axis and(iii) The dynamically equivalent systemofthe connecting rod comprising two

masses one at the small end bearing centre. .

(b) A machinewhich is fo rotate at approximately 400 rpm, is run by an engine',turning' 10at 1500 rpm, through a roller chain having a pitch of 15 mm. The number of teethon sprockets should be between 18 and 105.The linear velocity of chain drive is not to exceed 600m/min. Find the suitabletooth numbers for both the sprockets.

. 10

~

6. (a) Draw a neat sketch ofTchebicheff's mechanism and show that its links are in ratio 8of 1: 2.5 : 2.

(b) Draw any mechanism wherein we have to consider the Corioli's component of 12accelerationwhile drawing an accelerationdiagram. State its magnitude and directionwith proof. .'

~

7. (a) A 3kg uniform rod rotates in a vertical plane about B. The spring of constant' 12k = 300 N/m and unstretched length of 120 mm is attached to the rod. In positionshown, angular speed of the rod is 4 rad/sec. clockwise.Dctcrmine angular velocity of the rod after it has rotated through 90°.

P (!, C)4 y=J/s",,,,.r 'kJ ';-2-2.!>- I 'if

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(b) With help of neat sketches explain major differences between Davis steering gearand Ackerman steering gear. .

8

139 . 2nd Exm.09-Dl)-(A)se.~ N ) Rev (AI kI I Mec~

$Ub '. ~ ~~(REVISED COURSE)

{De..e- -C9

Con. 5683-09. SP-7733\/

(3 Hours) [ Total Marks: 100

N.S. (1) Question NO.1is compulsory.(2) Attempt any four questions out of remaining six questions.(3) Assume suitable data if necessary.

1. (a) Explain two transistor analogy of SCR.(b) Comparison of series and parallel inverter.(c) Realize the all Basic gates using NANDgates only.(d) State important characteristics of OP-AMP.

20

2. (a) With suitable wave form explain Dual Converter.(b) Explain various methods of commutation of SCR.

1010

3. (a) Explain Jone's Chopper.(b) Explain the circuit in which speed of fan is controlled by DIAC-TRIAC circuit.

1010

4. (a) Explain basic series inverter with voltage and current wave forms.(b) Explain the speed control of DC shunt motor using Thyristor technology.

1010

5. (a) Draw block diagram of OP-AMP and explain its use as integrator. 10(b) With neat circuitdiagram and wave form explain single phase full wave half controlled 10

bridge rectifier.

6. (a) With functional block diagram explain how 555 Timer used as a mono stable multi 10vibrator.

(b) Draw block diagram of 8085. Mention the types of register used. 10

7. Write short notes on the following :-(a) Demorgans Theorem(b) Logic Gates(c) Instrumentation Amplifier(d) Thyristor Ratings.

20

- ~'~f"''''''''~'I.)~VI ut-lr'J(./V( HI/< )! V~-v:J

./ S~:- ~cvL ~n.ev-U~. Jette~ - /Ii~ 0&> 03Con. 5243-09. ~~', - '2.-;~ c - 5::J 0

(REVISED COURSE)SP-7736

(3 Hours) [Total Marks: 100

N.S. : (1) Question NO.1 is compulsory and solve any four from questionNos. 2 to 7.

(2) Assume suitable data if necessary and state it clearly.(3) Use of Mollier chart and Steam table is permitted.

1. Discuss and explain the following (any four) :-(a) Heating values of fuel.(b) Advantages of compounding of steam turbine.(c) Important featurs of high pressure boiler.(d) Effect of multistaging in compressor and turbine in gas power cycle.(e) Effect of pressure ratio on work output and volumetric efficiency of

compressor.(f) Effect of air leakage in case of condensers.

20

2. (a) Define:-(i) Enthalpy of combustion.(ii) Calorific value at constant pressure and constant volumes.

(iii) Adiabatic combustion temperatrure.(iv) Actual air fuel ratio.

(b) One kg of liquid octane (CsH1s) is burnt completely with 50% excess air, in 12a constant volume container. Before combustion, both liquid octane and airare at 25°C and 1 atmospheric pressure. The combustion products are at1600 K at the end of combustion. Calculate the heat transfer per kg-moleof fuel.

Use the following data :-

4

(c) Discuss the effect of back pressure on the performance of CD nozzle. 4

3. (a) Define:(i) Free air delivered in compressor.

(ii) Isothermal efficiency of compressor.(iii) Volumetric efficiency of compressor.(iv) Adiabatic efficiency of compressor.

8

[ TURN OVER

Substance h (MJ/K mol)' h298 K(MJ/K mol) h1600 K(MJ/K mol)

CSH1s (Liquid) - 250 - -

°2 - 8.68 52.96

N2 - 8.67 50.57

H2O (gas) - 241.8 9.90 62.75

CO2 - 393.5 9.36 76.93I

Con. 5243-SP-7736-09. 2

(b) A single stage double acting air compressor is required to deliver 14 m3 of 12air per minute measured at 1.013 bar at 15°C. The delivery pressure is7 bar and the speed is 300 rpm.Take the clearance volume as 5% of the swept volume with the compres-sion and expansion index of n = 1.3. Calculate-

(i) Swept volume of the cylinder,(ii) The delivery temperature

(iii) Indicated power.

4. (a) Describe different types of condensers. 8(b) A steam generator evaporates 18,000 kg/h of steam 12.5 bar and a quality 12

of 0.97 from feed water at 105°C, when the coal is fired at 2040 kg/h. If thehigher calorific value of the coal is 27,400 kJ/kg.Find :---,

(i) The heat rate of boiler in kJ/h ;(ii) The equivalent evaporation;

(iii) The thermal efficiency."'"

5. (a) A stage of turbine with Parson's blading delivers dry saturated steam at 2.7 12bar from fixed blade at 90 m/s. The mean blade height is 40 mm and themoving blade exit angle is 20°. The axial velocity of steam is 3/4th of theblade velocity at the mean radius.Steam is supplied to the stage at the rate of 9000 kg/h. Calculate:-

(i) The wheel speed in rpm(ii) The diagram power

(iii) The diagram efficiency(iv) Enthalpy drop in the stage.

(b) Classify different types of steam turbine.(c) Describe air motors.

44

6. (a) Describe boiler mountings and accessories. 8(b) The pressure ratio of an open cycle gas turbine power plant is 5.6. Air is 12

taken at 30°C and 1 bar. The compression is carried out in two stages withperfect intercooling in between. The maximum temperature of the cycle islimited to 700°C. Assuming that isentropic efficiency of each compressorstage as 85% and that of turbine as 90%, determine the power developedand efficiency of the power plant, if the air flow is 1.2 kg/so The mass offuel may be neglected and it may be assumed as Cp = 1.02 kJ/kg Kand V = 1.41.

"'"

7. Write notes on any four :-(a) Perfect intercooling in compressor(b) Differentiate between water tube and fire tube boiler.(c) Entropy changes for reacting mixtures.(d) Vacuum efficiency of compressors.(e) Condition for maximum efficiency in case of impulse turbine.(f) Applications of gas turbines.

20

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Can. 5950-09. (REVISED COURSE)

~: Q~ r5~ 00

SP-7739

(3 Hours) [ Total Marks: 100

N.S. (1) Question NO.1is compulsory.(2) Attempt any four questions out of remaining six questions.(3) Make suitable assumptions if required and justify the same.(4) Figures to the right indicate full marks.

1. (a) Derive one dimensional wave equation stating all conditions.(b) Obtain the half range Cosine series for f (x) =x in (0, 2).(c) A discrete random variable X has p.d.f. defined by -

I ~(X = xl I ~.~ l-k1 I 001 I 21k I 021 I

Obtain k, mean and variance.(d) The two regression lines are given by :-

20x - 9y - 107 =0 and 4x - 5y + 33 =0,Obtain - (i) Coefficient of correlation between x and y

(ii) Mean values of x and y.

555

32k

5

2. (a) Obtain complex form of Fourier series for the function -f (x) =e-x in (-1,1)

(b) A box contains a white and b black balls. C balls are drawn at random from thebox. Findthe expected value of numberof white balls drawn.

(c) The diameterof a semicircularplateof radiusa is kept at O°Cand temperatureatsemicircularboundaryis TOC.Findthe steadystate temperaturein the plate.

6

6

8

3. (a) Fit a Poisson distribution to the following data and test for goodness of fit :-

l~requencyI2~311:2 I :8 1135 I : I ~ I

(b) Obtain Fourier series for-

8

6

nf (x) = '2 + x ,

-n<x<O

n=--x

2

(c) Fit a second degree parabolic curve to the following data :-

I ~ I ~ I ~ I ; I : 1150 1161 I ~ 1180 I ~ 1

0 < x < n.

6

4. (a) Probability that an electronic component will fail in less than 1200 hrs of continuoususe is 0.25. Using normal approximation to Binomial distribution find the probabilitythat among 200 such components less than 45 will fail in less than 1200 hrs ofcontinuous use.

(b) A tightly stretched string with fixed end points x = 0 and x = I is initially in a position

given by y (x, 0) = Yosin3 ( nix). If it is released from rest from this position find

6

6

displacement y at any distance x from one end at any time t. [TURN OVER

179: 2nd Lxm.09-DLJ-(A)

:on. 5950-SP-7739-09. 2

(c) Obtain Fourier series for f(x) = x + X2; -1t ::; X ::; 1t and f(x + 21t) = f(x).

1t2 1 1 1Hence deduce that - = - + - + - + .........

6 12 22 32

au a2u

5. (a) Usingmethodof separationof variablessolve at= ax2U = 0 as t ~ 00 ; u = 0 when x = 0 and x = L.

(b) A random sample of 50 items has mean 6.2 and variance 10.24. Can it be regardedas drawn from a normal population with mean 5-4 at 5% level of significance?

(c) What is rank correlation? Determine the coefficient of rank correlation from thefollowing data :-

I ~ I ~ ~ I ~ ~ I ~: I ~: I ~~ I ~~ I

6. (a) Find Fourier integral representation off(x) = 1 _X2; -1 ::;x::; 1 and is zero otherwise.(b) Two independent samples of sizes 8 and 7 gave the following results :-

Is the difference between sample means significant?(c) Obtain two lines of regressionand coefficientof correlationfrom the followingdata :-

7. (a) Prove that the set of functions cos nx ; n = 1, 2, is orthogonal over (-1t, 1t).Hence construct corresponding orthonormal set.

(b) A die was thrown 132 times and following frequencies were obtained -

Test whether the die is unbiased.(c) Obtain all possible solutions of two dimensional heat equation for steady state

conditions using method of separation of variables.

\.,

8

6

6

8

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8

6

6

8 -

Sample 1 19 17 15 21 16 18 16 14

Sample 2 15 14 15 19 15 18 16

X 65 66 67 67 68. 69 70 72Y 67 68 65 66 72 72 69 71

Number obtained 1 2 3 4 5 6

Frequency 15 20 25 15 29 28

VT-II-09-93\.

- ~~ Irti(~rS"c ~ 1-:fL I~) (J,'K1 ( '9-e C--O g54~. r-oJ~~~ ~'N~. .

5598-09. (REVISED COURSE) SP-7742Con.

( 3 Hours) [ Total Marks: 100

N.B. : (1) Question NO.1 is compulsory.(2) Attempt any four questions out of remaining six questions.(3) Figures to the right indicate full marks.(4) Assume suitable data if required.

1. Write short notes on the following :-(a) Chip reduction coefficient(b) Types of cutting fluid(c) Cutting action of a broach(d) Chip formation(e) Locating Devices.

20

2. (a) A seamless tubing 35 mm outside diameter is turned orthogonally on a lathe.The following data available, rake angle 35° cutting speed 15 mlmin feed0.10 mmlrev, length of continuous chip in one revolution 50.72 mm cutting force200 kg feedforce 80 kg. Calculate coefficient of friction,shear plane angle, velocityof chip along tool face. and chip thickness.

(b) Prove that the strain in chip is minimum when the volume of the chip reduction 10coefficient is unity.

10

3. (a) Mildsteel workpices 200 long x 100 mm diameter are to be turned on a lathe 15using a feed of 0.15 mmlrev and depth of cut 2.50 mm. use of two types ofcarbide tool lifeviz.'brazed and throwaway carbide bits is possible in this case.The following relevant data are available. Compare the unit cost machiningattainable from the two types of tools and the minimum production time :-

Brazed Tool Clamped Tool

Purchase cost Rs. 1001- Tool tip cost Rs. 15/-

No of regrinds 10 Edge per tip 6

Grinding cost Rs. 2.50 Tool holder cost Rs. 350/- per tool edge

Tool changing time 5 min No of edges per holder700 Tool indexingtime 1 min

Idle time per component is 3,0 and (labour + machine + overhead) rate Rs. 25per hour. The tool equation for both is VTO'25 = 150.

(b) State the factors responsible for poor as well as good surface finish. 5

4. (a) Under what circumstanceswould you recommended the use of cutting fluids listedbelow :-

(i) Extreme pressure emulsion(ii) Chemical coolant

(iii) Liquid carbon dioxide(iv) Compressed air(v) Straight mineral oil.

(b) Explain types of rolling mills with neat sketch.

10

10

[TURN OVER

or-

Con. 5598-SP-7742-09. 2

5. (a) Discuss the effect of following factor on tool life :-(i) Tool geometry(ii) Coolant

(iii) Microstructure.

(b) List and explain the type of locators used in jig and fixtures with simple sketch. 10

10

6. (a) Show the difference between progressive compound and combination die on 10their constructional features.

(b) Describe the main considerations while heat treating a broach. 10

7. (a) Find the power in broaching a keyway in a cost steel pulley. The size of keyway 10is 10 mm width x 5 mm depth x 300 mm length. If broaching is performed at3 m/min and feeds for rough and finish broaching are respectively 0.10 mmltooth and 0,03 mm/tooth, determine the size of Broach.

(b) Give the function of each tool element. List the various tool angles and discuss 10their significance.

"'"'*********

~E.l~~/-siYW\ -1r! ArK! /~- '~S{J3

'-VT-II-09.122

Con. 5831-09. (REVISED COURSE) SP-7745

( 3 H0 urs ) [ Total Marks: 100

N.S.: (1) Question NO.1 is compulsory.(2) Attempt any four questions out of remaining six questions.(3) Illustrateanswers withneat sketches.(4) Figures to the right indicate full marks.

1. (a) What are point defects? Illustrate with neat sketches the various types of 10point defects.

(b) Drawfullylabelled Fe-Fe3C diagram indicatingcriticalpoints and temperatures. 10Write the three important transformations seen in the diagram.

2. (a) Explainslip mechanism of plastic def~rmation. What is critical resolvedshear 10stress? Derive its expression for deformation by slip. .

(b) Define creep. Draw classical creep curve. Expain each step in detail. 10

3. (a) Define fracture. Explain brittle, ductile, creep and fatigue fracture. 10(b) What is recrystallizationannealing? Discussvarious stages of recrystallization 10

annealing in detail. What are the factors affecting it ?

4. (a) Discuss the following heat treatment processes :-(i) Normalising(ii) Tempering(Hi) Austempering.

(b) Discuss case hardening process of 'nitriding' in detail.

10

10

5. (a) Discuss hot and cold working theory. Explain their advantages, limitations 10and applications.

(b) Discuss the advantages of alloying elements. Explain the significance of 10any four alloying elements in plain carbon steel.

6. (a) Explain the following :- 10(i) Aluminium based alloys

(ii) Copper based alloys.(b) Define fatigue failure. Explain fatigue testing and interpretation of S-N curve. 10

7. Write short notes on any four of the following :-(a) Hardenability(b) High speed steels(c) Creep resistant materials(d) Atomic packing factor of BCC lattice(e) Induction hardening(f) Precipitation hardening.

20

*********

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~ono 5331-09°..:iirn-e : ~

IIt rh 1) &- 0 VC)0: rJ Q- 5 : :1-0

(OLD COURSE)(3 Hours)

u

SP-8232

[Total Marks: 100

N.B.:(1)(2)(3)(4)(5)

Question No.1 is compulsory.Attempt any four questions out of remaining six questions.Use of Mollier Chart and Steam Tables is permitted.Assumptions made should be clearly stated.Assume suitable data whenever required but justify the same.

,1. (a) Define and explain the following any four of the following :-(i) Boiler efficiency(ii) Degree of reaction of reaction turbine stage

(iii) Enthalpy of Formation.(iv) Free Air Delivered (FAD)(v) Higher and Lower Calorific Values (HCV & LCV)(vi) Enthalpy of combustion.(vii) Factor of equivalent evaporation.

(b) Explain the advantages of multistage compression. When will you preferand'select the use of multistage cC?mpressoragainst a single stage compressorin any application.

12

8

2. (a) Define adiabatic flame temperature. In which of the following air-fuel mix- 12tures the adiabatic flame temperature, will be maximum and why?

(i) Rich mixture(ii) Stoichiometric mixture(iii) Lean mixture.

Why the adiabatic flame temperature will be less than maximum for theremaining other two types of mixtures listed above?

, ExpJainyour answers with examples of combustion chemical reaction equationsfor the three cases for a hydrocarbon fuel, say, propane (C3Ha) with 80%theoretical air, 100% theoretical air and 250% theoretical air. ,

(b) Butane (C4H1Q)is burned with 90% theoretical air. Calculate the volume 8percentage of CO in the products and the air-fuel ratio. Assume nohydrocarbons in the products.

3. (a) What methods are used to improve the thermal efficiency of open cycle Gas 8Turbine plants? Explain with appropriate T-s and schematic diagrams, anyone method in details. "

(b) A gas turbine unit has a pressure ratio of 6:1 and maximum cycle temperature 12of 610°C. The isentropic efficiencies of the compressor and turbine are80% and 82% respectively. Calculate (i) the net power output of the plantwhen the air enters the compressor at 15°C, at theraJe of 16 kg./s. (ii) theback work ratio, and its significance.

Take Cpa = 1.005 kJ/kg K, 1a = 1-4

CPg = 1.11 kJ/kg K, 19 = 1.333

4. (a) Enlist the common types of steam turbines, classified on the basis of the 10action of the steam. In which type of the steam turbines listed by you above,compounding methods are used and why? '.State all the methods of comopounding, and explain anyone of them withneat diagrams.

(b) The velocity of steam exiting the nozzle of the impulse stage of a turbine is 10400 m/s. The blades operate close to the maximum blading efficiency. Thenozz~e angle is 20°. Considering equi-angular blades and neglecting blade

""

Con. 5331-SP-8232-09. 2

5. (a) Explain the terms perfect and imperfect intercooling with respect to a 10reciprocating compressor,with neat P-Vdiagrams. Why intercooling is employedin compressors?

(b) A single stage single acting air compresor delivers air at the rate of 100.6 kg/min, at 6 bar. The temperature and pressure at the end of suctionstroke of the compressor are 30°C and 1 bar. The bore and stroke of thecompressor are 100 mm and 150 mm respectively. The clearance is 3% ofthe swept volume. Assuming the index of compression and expansion tobe 1.3, find:

(i) Volumetric efficiency(ii) Power required if mechanical efficiency is 85%.(iii) Speed of the compressor (rpm).

6. (a) Classify any two of the following as Boiler mountings or accessories and 8explain with neat sketches.

(i) blow off cock(ii) Economiser(iii) Air preheater(iv) Fusible plug.

(b) A boiler plant consists of an economiser, a boiler and a superheater. Using 12exclusively steam table data. determine:

(i) Percentage of heat in coal utilised in economiser, boiler andsuperheater

(ii) Overall efficiency of the boiler plant, for the boiler plant data asgiven below: .

* Mass of water evaporated* Mass of coal burnt'* Lower calorific value of coal

* Pressure of steam at @oiler stop valve* Temperature of Feed Water entering the

economiser

* Temperature of Feed Water exiting theeconomiser

* Dryness fraction of steam leaving theboiler and entering the superheater

* Temp. of steam leaving the superheaterand at the same pressure as boiler stop

valve, . tsup = 260°C(Note: No assumptions to be made and allowed in this numerical)

-

=5940 kg/h= 675 kg/h= 31.6 MJ/kg= 14 bar

te1 = 32°C

te2 = 115°C

= 0.96~

7. Write short notes on any four of the following :-(a) Metastable expansion of steam and Wilson line(b) Effect of clearance on volumetric efficiency of compressors.(c) Boiler and steam generator(d) Advantages of high pressure boilers.(e) Surging and choking(f) Advantages and disadvantges of centrifugal compressors over axial flow

..,'. ,- .'. compressors.

20

-----

""'

:on. 5331-SP-8232-09. 2

5. (a) Explain the terms perfect and imperfect intercooling with respect to a 10reciprocating compressor, with neat P-V diagrams. Why intercooling is employedin compressors?

(b) A single stage single acting air compresor delivers air at the rate of 100.6 kg/min, at 6 bar. The temperature and pressure at the end of suctionstroke of the compressor are 30°C and,1 bar. The bore and stroke of thecompressor are 100 mm and 150 mm respectively. The clearance is 3% ofthe swept volume. Assuming the index of compression and expansion tobe 1.3, find:

(i) Volumetric efficiency(ii) Power required if mechanical efficiency is 85%.(iii) Speed of the compressor (rpm).

6. (a) Classify any two of the following as Boiler mountings or accessories and 8explain with neat sketches.

(i) blow off cock(ii) Economiser(iii) Air preheater(iv) ,Fusible plug.

(b) A boiler plant consists of an economiser, a boiler and a superheater. Using 12exclusively steam table data. determine:

(i) Percentage of heat in coal utilised in economiser, boiler andsuperheater

(ii) Overall efficiency of the boiler plant, for the boiler plant data asgiven below:

* Mass of water evaporated* Mass of coal burnt'* Lower calorific value of coal* Pressure of steam at soiler stop valve* Temperature of Feed Water entering the

economiser* Temperature of Feed Water exiting the

economiser* Dryness fraction of steam leaving the

boiler and entering the superheater* Temp. of steam leaving the superheater

and at the same pressure as boiler stop

valve, , tsup = 260°C(Note: No assumptions to be made and allowed in this numerical)

= 5940 kg/h= 675 kg/h= 31.6 MJ/kg= 14 bar

te1 = 32°C

te2 = 115°C

= 0.96

7. Write short notes on any four of the following :-(a) Metastable expansion of steam and Wilson line(b) Effect of clearance on volumetric efficiency of compressors.(c) Boiler and steam generator(d) Advantages of high pressure boilers.(e) Surging and choking ,

(f) Advantages and disadvantges of centrifugal compressors over axial flowcompressors.

20

."

'"

-----

Con. 5833-09.~'. ~ - Mt\~ oJ, .

(OLD COURSE) SP-8234

VT-II-09-123

( 3 Hours) [ Total Marks: 100

N.S.: (1) Question NO.1 is compulsory.(2) Attemptany four questions of the remainingsix questions.(3) Figures to the right indicate full marks.(4) Illustratewithneat sketches whenever required.

1. (a) Draw fully labelled iron-iron carbide (Fe-Fe3C) diagram indicating critical 10points and temperatures.

(b) Explainthe T-T-Tcurve and cc curve. Explainthe Austempering,Martempering 10and Ausforming of steel.

2. (a) What are linedefects? Illustrateand discuss the various types of line defects. 10Also explain their effect on the properties of materials.

(b) Discuss BCCunitcell. Determineit's atomic packingfactor. State slip system. 10

3. (a) Explain the Griffith'stheory of Brittlefracture and derive Griffith's Equation. 10What is Ductile-to-Brittletransition?

(b) What is fatigue failure? Discuss fatigue testing and explain S-N curve for 10ferrous and non-ferrous metals.

4. (a) Definecreep. Drawand explainthe various stages of creep. Alsodiscuss 10the developmentof creep resisting materials.

(b) Discuss in detail Recrystallisationand factors affecting it. 10

5. (a) Discuss the principle, process and applications of -(i) Chromising(ii) Boron Diffusion.

(b) What do you understandbyAnnealingand Normalising?two heat treatements and differentiate between them.

10

Discuss these 10

- -~u_-------

6. (a) Discuss the effect of alloying elements in steels and development of alloy 10steels. Classify alloy steels.

(b) Draw neat and labelled microstructureof-(i) White Cast Iron

(ii) Low Carbon Steel(iii) Grey Cast Iron(iv) Eutectoid Steel.(v) High Speed Steel

10

7. Write short notes on any four of the following :-(a) Baushinger Effect(b) Heat Treatment for 18-4-1 Tool Steel(c) Solidification of Pure Metals(d) Sub-zero Treatment(e) Age Hardening

20

~:2ndExm.09-AM~. rd-v-.-cY-1 ~rO U \j~

Con. 5623-09. (OLD COURSE)

(3 Hours)

J-l-5 P-8240

[ Total Marks: 100

N.S.: (1)(2)(3)(4)(5)

Question NO.1 is compulsory.Attempt any four questions out of remaining questions.Illustrate your answer with neat sketches.Figures to the right indicatefull marks.Assume suitable data ifnecessary.

2.

1. Write short notes on any four of the following :-(a) Ultrasonic machining(b) Types of presses(c) Tool wear(d) Tooldynamometer(e) Parkinson gear tester(f) Template and plate type jig.

(a) An automatic lathe is to be used to machine brass component 75 mm long and 1050 mm diarheter using a depth of cut of 1.25 mm. Select the speed that minimisesthe machiningcost and calculatethe correspondingtool life.Also estimatethe cuttingspeed for minimum time of production. Assume that Labour and overhead rateRs. 5.00 per hour.Reconditioning cost of tool edge Rs. 0.25 per edgeLoading and unloading time of work piece 13 secondTool change time 5 min.Feed 0.2 mm/rev.Tool life relationship VTo.25= 300.

(b) Derive expression of Merchant's theory with Merchant circle diagram. Also write 10assumptions.

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3 (a) Write the difference between pull and push type broach. Also explain the various 10steps involved in the design of circular pull type broach.

(b) Draw the necessary views of twist drill and mark all the features on these views. 10Expl.ainthe effect of the following features on force and torque:

(i) Diameter of drill(ii) . Point angle

(iii) Chisel edge angle.

(a) Explain principles used for the design of jigs and fixtures.(b) Discuss the following :-

(i) Turning fixture(ii) Quick acting clamps.

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4.

6.

5. (a) Design and sketch a blanking die to produce 10000 pieces of diameter 28 mm 10and 2.5 mm thick. The material is having shear strength of 380 N/mm2.Assume suitable data if necessary.

(b) Sketch deep drawing setup. Explain various steps in drawing. Also explain the 10influence of the following parameters on the component produced.

(i) Dia radius(ii) Punch radius.

(a) Explain Taylor's principle of limit gauging. Explain design consideration in limit 10gauging.

(b) Explain the use and working of following measuring instruments :-(i) Angle deckor

(ii) Tool makers microscope.

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7. Attempt any four of the following :-(a) Gear shaping (d)tn\ T\lnt:>~ nf nt:>nninn nit:>~ {t:>\

20Requirements of tool dynamometernifft:>rt:>nf"'t:> ht:>hAlt:>t:>n lint:> ~t~nn~rn~ ~nn Ann

Con. 5949-09. (OLD COURSE)

(3 Hours)

SP-8243

[TotalMarks: 100

N.S.: (1) Question No.1 is compulsory.(2) Attempt any four questions out of remaining six questions.(3) Assume suitable data wherever required and justify the same.(4) Figures to the right indicate full marks.

1. (a) Find the solutions of one dimesional heat equation

au 2 a2u- = c-at ax2

(b) From the following table find f(-2.5)

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I f;) I ; I ~ I -~ 11: I(c) Obtain the complex form of Fourier series for f(x) = eax in (0, a)

(d) Evaluate the root of cosx - xex = 0 by bisection method in four steps.

2. (a) Solve au = 2 ~u + u by the method of separation of variables subject to theax ut

condition u(x, 0) = 6.e-3x.

(b) Compute the real root of x 10910x - 1.2 = 0 correct to three places of decimals 6using Newton-Raphson method.

6

(c) Find Fourier cosine integral for 8

fix) = f~ x2Hence evaluate

0::; x::; 1

x>1

00

f(x cosx - sinx

)x

d3 cos - Xx 2a

3. (a) Find Fourier series of f(x) given by

{n x 0 < x < 1

f(x) -0 1<x <2

6

(b) Evaluate the integral

5.2

I = f loge x dx using4

(i) Trapezoidal rule(ii) Simpson's three eighth rule

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(c) A tightly stretched string with fixed end points x = 0 and x = I in the shape definedby y = k x (T- x) where k is a constant is released from this position of rest. Find

2 2

y(x,t), theverticaldisplacementif a r = C2a ~.at ax

8

./Con. 5949-SP-8243-09. 2

4. (a) Solve the system of equations2x + 3y + 4z = 11, x + 5y + 7z = 153x + 11y + 13z = 25 by Gauss - Jorden method.

(b) Find the half-range cosine series of f(x) given by f(x) = x(7t- x), 0 < x < 7t.

00 1 4

Hence show that I 4 = ~o'1 n

(c) Find the first and second derivatives of f(x) at x = 15 from the following data - 8

6

6

5. (a) The bounding diameter of semi-circular plate of radius 1° cm is kept at O°Candthe temperature along the boundary is given by

6

u(10, 8) = 50,81t

0<8< 2

1t

u(10, 8) = 50 (7t- 8) 2 < 8 < 7t

Find the steady state temperature function u(r, e).

(b) Find Fourierseries of f(x) = IsinxI for -7t < X < 7t.

(c) A rod of length [has its ends A and B kept at ooe and 100°C respectively untilsteady state condition prevails.Temperature at the end A is raised to 25°C andthat of the end B is reduced to 75°C and kept so, find the temperature distributionu(x, t).

2 1 26. (a) Prove that (i) Il = 1+ 4 8

(ii) IlD = sinh(h D).

~

6

8

6

2

(b) Solve the heat flow equation aau = k.a ~ subject to the conditions -t ax6

(i) u is finite when t -) 00

au(ii) ax = 0 when x = 0 for all values of t

(iii) u = 0 when x = Itor all t.

(iv) u = Uowhen t = ° for ° < x < 1 and Uois constant.

~

(c) Solve ddY = 1+ y2 with initial conditions y(O)= ° by Taylor's method. Obtain y asx .a series in power of x. Find the approximate values of y for x = 0.2, 0.4.

8

7. (a) Using Lagrange interpolation formula prove that

Y"o = ~ (y 1 + y-1) - ~ [~ (y3 - Y1) - ~ (y -1 - Y-3)]

6

(b) Define orthogonal functions, prove that the set of functions

{

XX X

}e-2, (1-x)e -2, (2 - 4x + x2)e -2 are orthonormal over (0, (0)

6

x 15 17 19 21 23 25

f(x) 3.873 4.123 4.359 4.583 4.796 5.000

S.E, S-e;vY\.-~ I D1~ IArKT

c5U-k' - C 'C fY)(

(OLD COURSE)

DeL- ocr

'..17: Oct.09-AM(c)Con. 5837-09. SP-8300

(3 Hours) [ Total Marks: 100

N.S.: (1)(2)(3)(4)

Question No.1 is compulsory.Attempt any four questions out of remaining six questions.Figures to the right indicates full marks.Answer to sub-questions of an individualquestion should be written togetherand one below the other.

1. (a) What do you understand by delegation? What are the difficultiesof managers and 10subordinates in delegation of authority?

(b) What are the principles and features of scientific management of Taylor? 10

2. (a)(b)(c)

Describe the objectives of economic planning. 5State Merits and Demerits of Monopoly. 5What do you know by Human Resource Development? Explain its importance and 10its necessity.

'""

3. (a) Describe various sources of public revenue.(b) Discuss the objectives and process of quality control in detail.

1010

4. (a) Explain the advantages of decentralization. Why some organisations resist 10decentralisation ?

(b) Define money and explain its functions and importance. 10

5. (a) Explainmultiplecredit expansion process. ' 10(b) What is demand? Explain the law of demand. Are there any exceptions to this 10

law?

6. (a) What is marketing research? Explainits advantages and limitations. 10(b) ExplainMaslow'sneed hierarchy.Compare itwithHerzberg'smaintenance motivation 10

theory.'"

7. Write short notes on any four of the following :-(a) Project Management(b) Drawback of Indian banking system(c) InventoryControl(d) Importance of study of economics(e) Decision making process(f) Advantages of Production Planning and Control.

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