Ies mechanical-engineering-2010

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Se"Y\It'c..eo Exc..m.( ooh'cn J 2010

-a --"'1~0\Q .... ,""""" ~ .. ~ .. -... ----== •.•aineerint Suvice !!saminatioa. C

DO NOT OPEN THIS TEST BOOI(LET UNTIL YOU ARE ASKED TO DO SO

T..B.C. : Q-GUG-K-NFA Test Booklet Series

Serial .N~ ........ _ ..

_ oatri~i. TEST BOOKLET

MECHANICAL ENGINEERING PAPER I

Time Allowed : Two Hours : 200

INSTRUCTIONS 1. IMMEDIATELY AFTER THE COMMENCEMENT OF THE .L.t.t-:0..~ .... !-N~ ION, YOU SHOULD

CHECK THAT THIS TEST BOOKLET DOES NOT HA ~ PRINTED OR TORN

2.

3.

4.

5.

6. 7.

8.

·9. 10.

OR MISSING PAGES OR ITEMS ETC. IF SO, GET X CED BY A COMPLETE TEST BOOKLET .. ENCODE CLEARLY THE TEST BOOKLET SERI · BE IN THE APPROPRIATE PLACE IN THE AN You have to ·enter your Roll Number on the Test Booklet in the Box provided alongside. DO NOT write anything else on the Te Boo This Test Booklet contains 120 item (q estions). Each item comprises four responses (answers). You will select the respo.&se hie you want to mark on the Answer Sheet. ln case you feel that there is more h'Jn n ~orrect response, mark the response which you consider the best. In any case, cho se ¥ONE response for each item. You have to mark all your respo s ONLY on the separate Answer Sheet provided. See directions in the Answer S All items carry equal marks. ' ft. · . Before you proceed to mar i.n.h he Answer Sheet the response to various items in the Test Booklet, you have to fill in some particulars in the Answer Sheet as per instructions sent to you with your Admiss · n ~tificate.

After you hav · c ~ leted filling in all your respons.es on the Answer Sheet and the examination }1as a~ luCfed, you s~ould hand over to the Invigilator only the Answer Sheet. You are pe m1 ~d oo.; ake away w1th you the Test Booklet. · Sheets for h work are appended in the Test Booklet at the end. Penal ong answers :

TH?-RE ~IL J BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE IN THE OBJ ~TYPE QUESTION PAPERS. i--~~ere arc four alternatives for the answer to every question. For each question for which a wrong ~nswer has been given by the candidate, one-third (0•33) of the marks assigned to that question

will be deducted as penalty. (ii) If a candidate gives more than one answer, it will be treated as a wrong answer even if one of

the given answers happens to be correct and there will be same penalty as above to that question. (iii) If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty for

that question. ·

DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED TO DO SO

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1. · ':,.t'4 4.

6m

With reference to the above figure, the shape factor between 1 and 2 is

(a) 0·272

(b) 0·34

(c) 0·66

(d) data insufficient

2. A jet of oil with relative density 0·7 strikes normally a plate with a velocity of 10 m/s. The jet has an area of 0·03 m2. The force exerted'. on the plate by the jet is

(a) 210 N

(b) 2·1 kN

(c) 20·6 kN

(d) 206.N

3. answer using the code given belo

List I

A. Lubrication

B. Rise of sap in trees • pressure

C. 3. Viscc;>sity

D. 4. Surface tension

B c D

4 1 3

3 4 1 2

(c) 2 1 4 3

(d) 3 1 4 2

0-GUG-K-NFA ( 2- A l

Match List I with List II and select the correct· answer using the code given below

. the lists :

List I List II

A p

v

B. 2. Carnot cycle

p 3. Brayton

cycle

v

t::J D . p 4. Otto

cycle

v Code:

A B c D

(a) 4 2 3 1

(b) 1 2 3 4

(c) 4 3 2 1

(d) 1 3 2 4

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5. Consider the following statements regarding 7. Bernoulli's theorem for fluid flow

1.

. 2.

Conservation of energy_

Steady flow

3. Viscous flow

4. Incompressible flow.

Which of the above statements is/are correct?

(a) 1, 2 and 4 only

(b) 1 only

(c) 2, 3 and 4 only ·

(d) 1, 2, 3 and 4

8.

6. Match List I with List II and select the correct answer using the code given below the lists·:

Li.<it T List II

A ·steam

turbine

B. Subsonic diffuser

C. Supersonic nozzle

(b) 2

(c) 3

(d) 2

b-GUG-K-NFA

4

4

5

5

c 5

5

4

4

1. -·

2.

3.

D

3

3

1

3

9.

( 3- A

The parameters which determine the friction for turbulent flow in a rough pipe are

(a) Froude number and relative roughness

(b) Froude number and Mach number

(c) Reynolds number and roughness

(d) Mach number and relative ro

answer using the code gi\1 n

List I (Process index 'n '~

A.

B.

A

. (a} 3.

(b) 2

(c) 3

(d) 2

B

1

1

4

4

• T

c 4

4

1

1

·D

.2

3

2

3

s

relative

3

For designing air-conditioning ducts, equal friction method

(a) Ensures same velocity in the duct all through in all branches

(b) Ensures constant static pressure at all terminals in the duct

(c) Automatically reduces the air-velocity in the duct in the direction of flow

(d) Does all of the above

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10. An oil of kinematic viscosity 0·5 stoke is 14. flowing through a pipe of 5 em diameter. The flow through the pipe becomes critica:I at a velocity of

(a) 0·2 m/s

(b) 2 m/s

(c) 2·5 m/s

(d) 4 m/s

11 .. Which one of the following statements is not correct?

In a transient flow process

(a) The rates of inflow and outflow of mass are differ~nt

(b) The state of matter inside the control volume varies . with time

(c) There can be heat and work interactions across the control volume

(d) There is no accumulation of energy inside the control volume

12. Detonation in the S.I. engine becomes severe

13.

during

(a) Low load and high speed

(b) High load and high speed

(c) Low load and low speed

(d) High load and low speed

The head loss in a sudden exp 6 em diameter pipe to 12 terms of v~locity V 1 in pipe is

(a)

(d)

3 16

y2 9. _1

16 2g

•

15.

Q-GUG-K-NFA 4- A

Consider the following statements regarding

turbulent boundary layer on a flat plate

with zero pressure gradient :

1. The thickness of the boundary layer

increases approximately as the power of

the distance from the leading edge.

2. approximately inversely

the square root of

number.

Which of the correct ? • (a)

2 only

IS

Air (density 1·2 kg/m3 and kinematic

viscosity 15 centistqkes) flows over a flat

plate, at zero angle of incidence, at a

velocity of 20 ·m/s. If Reynolds number at

transition is taken as 2·5 .x 105, maximum

distance, from leading edge up to which the

boundary layer remains laminar, is

(a) 375 mm

(b) · 93·75 mm

(c) 187·5 mm

(d) 250 mm

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16.

17.

18. In similitude with gravity force, where equality of Froude number exists, the velocity

(Where SA and S8 are the specific gravities 19.

of the two fluids)

What is the absolute pressure at A measured by an open tube manometer as in the figure

above ? Assume atmospheric pressure as 103 kN/m2

.

(a) 78·5 kN/m2

(b) 180 kN/m2

(c) 1030 kN/m 2

(d) 103 kN/m2

The we1r of e fi.ead of water over nd the head due to

is 0·02 m, is given by

20.

ratio becomes ·

(a) 1·0

(b) (L )112 r

(c)

(d)

Where L = ratio of mode r

dimension.

The velocity potentia f - ction is given by an

xyS - x2 + x3y ·+ y2. The 3 3

t in x direction is

y3 2 - + 2x- x y 3 .

(c) 3x2y + 2x - xy2

(d) x3y 2 + 2x2 - y2x

A refrigerated van has to be maintained at - 10°C, while ambient temperature is 32°C. Overall surface area of the van is 25 m2_ The walls of the van are of 16 mm plywood (k = 0-06 W/m.K) at inner surface and 12 mm of glass work (k = · 0·06 W/m.K). The capacity of the refrigerated van in tons of refrigeration will be

(a) 0·10 ton

(b) 0-35 ton

(c) 0·55. ton

(d) 0-65 ton

0 -GUG-K-NFA ( 5 -A

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21. The velocity potential in · a flow field is 25. • ~ = 2xy. The corresponding value of stream

function is

(a) (y2 - x 2) + constant

(b) . (x2 - y2) + constant

(c)

(d) 2(x- y) + constant

The stream function in a two-dimensional

flow field is given by \jl = x2 - y2. Then the magnitude of velodty at point (1, 1) is

(a) 2

(b) 2 .J2

(c) 4

(d) 8

22. As an index of comfort, the temperature of 26. In air-water vapour saturated air at which a person would

experience the same feeling of comfort as saturation temperat experienced in the actual unsaturated

onds to the

environment is called the (a)

(a) Comfort temperature

(b) Effective temperature

(c) Wet bulb temperature

(d) Soothing temperature

23. When moist air passes through a bed of si i

24.

gel, the

(a)

(b) Dry bulb temperature

(c) Specific humidity of a1

(d) tic~aturation

(c) \1' = x2y2, ~ = x2 + y2

(d) 'l' = x2 + y2, <jl = x~y2

0-GUG-K-NFA ( 6- A.)

(b)

he components of velocity u and v along X • and Y directions in a 2D flow problem of' an incompressible fluid are

1. u = x2 cos y; v = - 2x sin y

2. U = X + 2; V = 1 - y

3. u = xyt; v = x 3 - y2t/2

4. u = ln x + y; v = xy- y/x

Which of these will satisfy the continuity equation ?

{a) 1, 2 and 3 only

(b) 1, 2 and 4 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

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28. Moderator in a nuclear plant is used to 31.

(a) Protect against neutron and gamma rays

(b) Absorb excess neutrons ·

(c) Slow down the speed of fast' moving

neutrons

(d) Return the neutrons back into the core of

the reactor

29. A certain air has DBT of 35°C and DPT of

'rhe components of rotation for a three-dimensional flow field

~ A . A

V == (y2 + z2) i + (x2 + 1.2) j + (x2 + y2) k at

(1, 2, 3) are

(a) wx = -1 rad/s, w y = 2 radls, w = -1 radls z

(b) wx = -1 rad/s, wy == -1 radls, wz = 2 radls

(c) wx = -2 rad/s, w = -2.rad/s z .

(d) wx :::: 2 rad/s, wz = -1 rad/s

20°C, the corresponding saturation pressur~. 32. The higher calorific of fuel occurs when

of water being 5·628 kPa and 2·33 kPa + respectively. When the atmospheric pressure is assumed as 1·0132 bar, the specific humidity of air will . be

(a) 2·5 x 10-3

{b) 7·8 X 10-3

(c) 14·7 x 10-3

(dJ 25 x lo-3

30. The effects of superheatj evaporator and sub coo · the condenser, fo

work + (a)

"""'......_, ... perheating increases COP, but sub

cooling decreases COP

(d) Superheating decreases COP, but sub

cooling increases COP

(.a) m products of combustion is o the initial temperature of

resent in products of combustion is not ndensed to the initial temperature of

he fuel

Is not formed during combustion of a fuel

(d) Is formed during combustion of a fuel

33. The vapour compression refrigeration cycle is an inherently irreversible cycle, because

34.

(a) The compressor is non-ideal

(b) The evaporator is not frictionless

(c) The condensation process is not isothermal

(d) Of the use of expansion valve instead of an expansion engine

The Stoichiometric air-fuel ratio by volume for combustion of carbon monoxide in air is

(a) 1·19

(b) 2·38

(c) 2·45

(d) 4·76

0-GUG-K-NFA I 7 - A )

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35. A 50 em diameter spherical vessel 1s 38.

completely filled up with a liquid of specific gra~ity 0·8; the vessel and the liquid are

then rotated about the vertical axis,

without relative motion, at a rotational

speed of 20 rad/s. The points of maximum

pressure lie on a horizontal plane below the centre of sphere by

(a) 12·5 em

(b) 6·96 em

(c) 2·45 em

{d) 1·96 em

3~. Consider the following :

1. EGR

2. Increased compression ratio.

3. Thermal reactor m the exhaust 39• manifold.

4. Use of 5% lean mixture.

Which of these are used io emission from engine exhaust ?

(a) 1 only

(b) 1, 2 and 4 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

37. A •

between · the

3°C and 27°C. If one

Consider the following :

1. Catalytic converter.

2. Use of high compression ratio.

3. Oxidation catalyst m the

manifold.

4.

By which of these techniques, of nitrogen m the en · contro1led ?

(a) 1 only

(b) 2 and 4 only

(c)

(d)

•

exhaust

ffe he following statements :

~iezometer is used to measure small variation of pressure above or below ambient pressure.

2. Thixotropic .fluid exhibits decrease in viscosity with time.


(a). 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

minimum power required 40. The main object of Morse test is to find out te the refrigerator is

(b) 0'17 kW

(c) 0·9 kW

(d) 1·0 kW

0-GUG-K-NFA ( 8- A)

(a) Performance of a petrol engine

(b) Performance of a diesel engine

(c) Frictional power of a petrol engine

(d) Indicated power of a single cylinder diesel engine

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41. Which phenomena have the most adverse 45. effect on volumetric efficiency when engine works at high speeds ?

(a) F.low friction and choking

(b) Ram effect and choking

(c) Flow friction and charge heating

(d) Charge heating and back flow

42. In rocket propulsion, the oxygen for combustion of its fuel' is. taken from

43.

44.

(a) Surrounding air

(b) The rocket itself

(c) Compressed atmospheric air

(d) Surrounding air and compressed atmospheric air

A body will be in a stable equilibrium in a floating condition if

(a) 'fhe metacentre is below the gravity

(b) The metacentre is above the gravity

. (c) The metacentric height is zero

(d) The centre of buoyancy coi the centre of gravity

Consider the following : 0 1. Increased cetan num~er.

2. Increased co e ion ratio.

3.

4.

above factors reduce the diesel engine ?

(b) 2 a.nd 4 only

(c) 2, 3 and 4 only

(d) · 1, 2, 3 and 4

centre

physical

46.

47.

Q-GUG-K-NFA 1.9 - A )

Consider the following statements :

1. Increasing the metacentric height of a ship causes increase in the period of rolling.

2. The frequency of pitching can be reduced by adding more loads along the length of a ship below its centre of gravity.

·3. A ship has difl'erent meta rolling and pitching.

4. Stability can be improve the width and reduc·

Which of the above stat-e

(a) 1, 2, 3 and 4

(b) 1, 2 and 4 only

(c) ly + (d)

ollowing factors :

in

can be reduced by

Engine speed.

Compression ratio.

3. Degree of supercharge.

4. Injection advance.

Which of the· above statements is/are correct ?

(a) 1, 2, 3 and 4

(b) . 2 and? only

(c) 1, 3 and 4 only

(d) 2 only

An ideal refrigerator is operating between a condenser temperature of 37°C and an evaporator temperature of - 3°C. If the machine is fun'ctioning as a heat pump, its coefficient of performance will be

(a) 6·00

(b) 6·75

(c) 7·00

(d) 7·75

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48. Two radiating surfaces A1 = 6m2 and 51. A2 = 4 m2 have the shape factor F 1_2 = 0·1; the shape factor F 2_1 will be

(a) 0· 18

(b) 0·15

(c) 0·12

(d) 0·10

49. Consider the following statements regarding SI engine:

50.

1. Specific output . is higher .. than CI engine.

2. It cim burn leaner mixtures than CI engine.

3. For a given volumetric capacity, its power output is lesser th~n CI engine.

4. Its exhaust pollution is higher relative to CI engine.

Which of the above statements is/are correct ?

(a) 1, 2, 3 and 4

(b) 2 only

(c) 2, 3 and 4 only

(d) 1 and 4 only

Consider the following statements1 eg Clen~ne:

1. CI engine knock increasing compressi

2. Thermal effici cy of a CI engirie is to a S~ngine.

3. specific output

4. use leaner' mixtures relative

(b) 2 and 4 only

(c) 1 and 4 only

(d) 1, 2, 3 and 4

0-GUG-K-NFA ( 10- A )

Consider the following statements related to the stability of floating bodies :

1. The . metacentrc should be above the centre of gravity of the floating body for stable equilibrium during smal.l oscillations.

2.

3.

4.

For a floating body, ·stability is not determined simply by the relative positions of centre of gravity n centre of buoyancy.

Large value metacentric height reduces the perinn•oA-...•To1l of the vessel.

. Which of ve~atements are correct?

(a)


1.

2.

3.

4.

P1 + Pa 2

~plp3

Intercooling is perfect.

Work in the. LP cylinder is twice the work in the HP cylinder.'

Which of the above statements are correct for maximum compression· efficiency in a 2-stage compressor ?

(a) . 1 and 3 only

(b) 2 and 3 only

(c) 2_ and 4 only

(d) 1, 3 and 4

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53.

54.

55.


1. Static pressure increases.

2. Stagnation pressure decreases,

3. Static temperature increases.

4 . Stagnation temperature decreases.

Which of the above statements are correct for change in properties across normal shock wave?

(a) 1 and 3 only

(b) 1, 2 and 4 only

(c) 1, 2 and 3 only

(d) 1, 2, 3 and 4


1. A small bubble of one. fluid immersed in another fluid has a spherical shape.

. 56. The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surfaces whose emissivity is 0·9 and maintained at 400 K and 300 K is

(a) 992 . (b) 812

(c) 567

(d) 464

57.

(c) 0·33

(d) 1·75

58.

•

the the

2. The droplets of a fluid move upward or downward in another fluid due to unbalance between gravitational and buoyant forces.

3. Droplets of bubbles attached to a surface can remain stationary in a gravitational fluid if the surface te exceeds buoyant forces.

4. Surface tension of a proportional to ~ts radius w force is proportionalto th radius.

Which of the above statem

(a)

(b)

(c)

(d)

1·2

(c) 2·2

(d) 9·26

•

pump works between of 277°C and 27°C. Its

59.

60.

Which of these are intensive properties?

(a) 1, 2 and 3 only

(b) 2 and 4 only

(c) 3 and 4 only

(d) 1, 2, 3 and 4

For film-wise condensation on · a vertical plane, the film thickness o and heat transfer coefficient h vary with distance x from the leading edge as

(a) S decreases, h increases

(b) Both S and h increase

(c) 8 increases, .h decreases

(d) Both S and h decrease

Molal specific heats of an ideal gas depend on

(a) Its pressure

(b) Its temperature

(c) Both its pressure and temperature

(d) The number of atoms in a· molecule

Q-GUG-K-NFA ( 11 - A )

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'.

61. Consider the following statements :

62.

63.

1. Mass transfer refers to mass in transit due to a species concentration gradie.nt

· in a mixture.

2. Must have a mixture of two or more species for mass transfer to occur.

3. The species concentrationgy:adient is the driving potential for mass transfer.

4. Mass transfer by diffusion is analogous to heat transfer by conduction.

Which of the above statements are correct ?

(a) 1, 2 and 3 only

(b) 1, 2 and 4 only

(c) 2, 3 an·d 4 only

(d) 1, 2, 3 and 4


1.

2.

3.

4 .

(a)

(b)

(c)

(d)

(a)

Temperature

Viscosity

Internal energy

Entropy

1, 2, 3 and 4

2 and 4 only

2 and 3 only

•

t o intersection of the buoyant force ........ _--. .... the gravitational force

oint of intersection of the buoyant force and the centre line -of the body

(d) : Centre of the ·volume of the displaced flu'id


1.

2,

3.

4.

(a)

(b)

(c)

(d )

Boiling of water from a heat source at tlie same boiling temperature.

Theoretical isotherm.al compression of a gas.

Theoretical polytropic process with heat atmosphere.

Diffusion of two ideal other at constant

compression rejection to

65. are o ·2 m diameter is immersed liquid of unit weight 800 N/m3

·<>'-1"'-n.c'-'edge just on the liquid surface. e th of centre of pressure on one· side,

su ea below the liquid surface, ~s

0·80 m

0·75 m

0·60 m

0·64 m

The following statements refer to axial flow compressors a·s compared to centrifugal com pressors :

1 . Can be designed for higher pressure ratios than centrifugal compressors.

2. Maximum efficiency higher than centrifugal compressors but in a narrow speed range.

3. More suitable for aviation gas turbines due to lower fronta1 area.

4. Lighter m mass than centrifugal compressors .

Which of the above statements are corre~t ?

· (a) .1 and 3 only

{b) 2 and 3 only

(c) 1, 2 and 3 only

(d) 1, 2, 3 and 4

0 -GUG-K-NFA ( 12 - A I

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67. Consider the following statements ! 70. A Carnot engine rejects 30% of absorbed heat to a sink at 30°C. The temperature of the heat source is

68.

69.

1. Slow heating of water from an electric heater.

2. ~seritropic expansion of air.

3. Evaporation of a liquid from a heat source at the evaporation,temperature.

4. Constant pressure heating of a gas by a

{a) 1oooc (b) 433°C

(c) 737°C

(d) 1010°C

constan~ temperature source. -71. If a fluid flows

Which of these processes is/are reversible ?

(a) 3 only

(b) 2 and 3 011ly

(c) 2 and 4 only

(d) 1, 2, 3 and 4

A curved surface has the shape of one-quadrant of a 3 m long 2 m diameter cylinder with two edges parallel to the axis. The curved surface is immersed in a stationary liquid of unit weight 10 kN/m3 such that one straight edge is on the liquid surfae and the other 1 m below the surface.

(b) 10·0 kNm

(c)

(d) •

unter-flow heat exchanger, profiles of the two fluids are

el and non-linear

{c) Linear but non-parallel

(d) Divergent from one another

72.

(a)

{b)

{c)

(d)

gJ. operates between temperature limi o 900 K and T2 and another between

ana 400 K. For both to be equally efficient, th value of T2 wHI be

700 K

{}?) 600 K

(c) 750 K

(d) 650 K

73. The tube of an inclined tube manometer has its upper end open to air and the lower end C<?nnected to a vertical cylinder trough having a diameter 4 times that of the tube. The slope of the. tube is 1 in 4 and specific gravity of manometer liquid is 0·72. The space above the liquid in the trough is connected to a gas chamber. When the movement of meruscus in the tube is 8 em, change in gas pressure, in height of water column, is

(a) 1·35 em .

(b) 1·44 Cpl

(c) 1·80 em

(d) 1·53 ern

0-GUG-K-NFA 13 - A )

- - -- -

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74.

75.

76.

Match List I with List II and select the correct. answer using the code given below the lists :

List I !.Jist II (Losses) (Parameters

re.~ponsible)

A. Leakage loss 1. Zero at design point

B. Friction loss 2. Proportional to head

C. Entrance loss 3. Proportional to half of relative velocity square

Code:·

A B c (a) 1 2 3

(b) '2 3 1

(c) 1. 3 2

{d) 2 1 3

In a heat exchanger, the hot liquid enters with a temperature of 180°C and leaves at 160°C. The cooling fluid enters at 30°C an leaves at ll0°C. The capacity ratio of the h exchanger is

(a)

(b)

(c)

(d)

(a)

(b)

0·25

0·40

0·50

0·55

ics states that

Two therm~d~ mi~ystems are always in thermal q · rium with each other

o systems not in thermal equilibrium a third system are also not in

thermal equilibrium with each other

(d) When two systems are in thermal equilibrium with a third system, .they are in thennal equilibrium with each other

77.

78.

80.

Q-GUG-K-NFA { 14- A )

_____ _L_ _____________ -- - -

On h"eat transfer surface, fins are provided

(a) To increase temperature gradient so as to enhance heat transfer

(b) To increase turbulence in flow for enhancing heat transfer

(c) To increase surface area to promote the rate of heat transfer

(d) To decrease the pressure fluid

The .annular space betw~ vertical cylinders, of equ le, with an incompressibl liq d constant viscosity. The outer er · held fixed and the inner cylinder 1s slo y-rotated about its axis at a uniform tatio al speed. Assuming that Newton's law of viscosity holds good

(a)

isco ~ shear stress in liquid is uniform r<>s •the gap

e tangential velocity of liquid varies on-linearly across the gap

Viscous shear stress in liquid varies linearly across the gap

Fins are made as thin as possible to

(a) Reduce the total weight (b) Accommodate more number of fins (c) Increase the width for the same profile

area

(d) Improve flow of coolant around the fin

Consider the following statements regarding a reciprocating .air compressor :

1. The effect of clearance is to reduce the volumetric efficiency.

2. The clearance has no effect on work done per kg of air delivered.

3. The volumetric efficiency decreases with increasing pressure ratio.

Which of the above statements is/are correct ? (a) 1, 2 and 3

(b) 1 and 2 only (c) 2 and 3 only (d) 3 only

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I.

81. An inventor states that his new engine rejects 83.

to the sink 40% of heat absorbed from the

source while the source and sink

temperatures

respectively.

equivalent to

are

His

(a) Joule engine

(b) Stirling engirte

engine

(c) Impossible engine

(d) Carnot engine

IS therefore

84.

A closed system receives 60 k,J heat but its. internal energy decreases by 30 kJ.' Then

the work done by the system is

(a) 90 kJ

(b) 30 kJ

(c) -30 kJ

(d) -90 kJ

(a)

(b) • 82. A thin plane lamina, of area A and weight W, (c)

slides down a fixed plane inclined to the

vertical at an angle a.. and maintains a

uniform gap E from the surface of the plane,

the gap being filled with oil of constant

viscosity ~- The terminal velocity of the pla

15

(a)

(b)

E cos a

~WA

Ej.tW

A sin a..

0-GUG-K-NFA ( .15 - A )

ider the follo:wing statements :

or a velocity~compounded impulse steam . . turbine stage having two rows of moving blades ·

L

2.

The work done in each row of moving blades is equal.

The efficiency of a velocity-compounded stage is less than that of a pressure-compounded stage.

3. The velocity-compounded stage is often used in the first stage of a multistage impulse turbine.


{a) 1 an~!,_ 3 only.

(b) 2 only

(c). 2 and 3 only

(d) 1, 2 and 3

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86. Extended ·surfaces are used to increase the 89.

rate of heat transfer. When the convective heat transfer coefficient h = . mk, the addition of extended surface will

(a) Increase the rate of heat transfer .,

(b) Decrease the rate of heat transfer

(c) Not increase the rate of heat transfer

(d) Increase the rate of heat transfer when

the length of the fin is very large

87. Consider the following statements

For a fluidized bed boiler

1. There ~s less formation of NOx.

2. It can burn inferior grades of coal.

Which of correct ?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

In a .quiescent sea, density of water at free surface is Po and at a point much below the surface density is p. Neglecting variation in gravitational acceleration g and assuming· a constant value of bulk modulus K, the depth h of the point from the free surface is

(a) K (__!_ + _!_) g Po P

(b)

(c)

• (d)

e critical radius of insulation

will be less than

conduction heat l()SS

(b) Heat flux will decrease

(c) Added insulation will increase heat loss

(d) Added insulation will decrease heat loss

(d) Neither lnor 2 91. Consider the following statements :

88.

(c) Open system

well insulated of

(d) Non-flow diabatic system

0-GUG-K-NFA ( 16 - A

For a supercritical steam generator

1. It has no steam drum.

2. It has no circulation pump.

3. The phenomenon of boiling does not occur in it.


(a) 1, 2 and 3

(b) '1 and 2 only

(c) 2 and 3 only

(d) 3 on~y

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92. Pseudo plastic is a fluid for which 95. Specific speed of a turbomachine

·(a) Dynamic viscosity decreases as the rate of shear increases

(b) Newton's law of viscosity holds ~.ood

(c) Dynamic viscosity increases as the rate of shear increases

(d) Dynamic viscosity increases with the time for which shearing forces are applied 96.

93. A control volume is

(a) An isolated system

(b) A closed system but heat and work can cross the boundary

(c) A specific amount of mass in space

(d)

region

94. The time constant of a therm c

(a) tai~lOO% of initial 98.

(b)

{d) The minimum time taken to record a tempeniture reading

0-GUG-K-NFA ( 17 - A )

(a) Is the speed of a machine having unit dimensions

(b) Relates the shape rather than size of machine

(c) Remains the · same under different conditions of operations

(d) Depends only upon the which the machine operates

Isothermal compression engine is an example of

(a) Open system

(b)

(c)

t• 1c system

ith a movable boundary

Adhesion is more than cohesion

(b) Cohesion is more than adhesion

(c) Cohesion is equal to adhesion

(d) Adhesion and cohesion have no bearing with angle of contact

A closed thermodynamic system manifests when

(a) Matter is not allowed to cross the boundary but energy transfer occurs across the boundary

(b) There is transfer of both mass · and energy across the system boundaries

(c) There is only transfer of mass but no heat and work energy are transferred

(d) There is absolutely no interaction of the system with surroundings

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99. Consider the following statements regarding a Directions : Each of the next twenty (20) items draft tube used in water turbines : consists of two statements, one labelled as the

of 'Assertion (AF and the other as 'Reason (R)'. You are 1. It .reduces the discharge velocity water to minimize the loss of kinetic energy at the outlet.

2.

3.

It permits the turbine to be set above the tail race without any appreciable drop in available head.

It is used in both impulse and reaction type of water turbines.


{a) 1, 2 and 3

{b) 1 and 2 only

(c) 2 and 3 only

(d) 1 only

to examine these two statements carefully and select

the answers to ·these items using the codes given

below : •

Codes:

(a)

(b) Both A and

is not the c

(c)

ut R is true

The constant pressure lines are steeper than the constant

100. · volume lines for a perfect gas

Ll

on the T-S plane.

Reason (R) ': The specific heat at constant pressure is more than the specific heat at constant volume· for a perfect gas.

The equivalent thermal e auctivity of the 102. A,<;,<;ertion (A) : In a diesel engme knocking wall as shown in \he figqre above is decreases with reduced engine

(a)

0-GUG-K-NFA

speed.

Reason (R) : With increased engine speed, quantity of fuel injected during the delay period increases.

103. Assertion (A) : Rocket engines are used for space research.

( 18 - A ) ·

Reason (R) : They have high specific impulse.

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104. Assertion (A) : Lumped capacity analysis of unsteady heat conduct ion assumes a constant uniform temperature throughout' a solid body.

Reason (R) : The surface convection resistance 18 very large compared with the internal conduction resistance.

105. Assertion (AJ : In a practical vapour compression refrigerator, the vapour should leave the evaporator with a definite amount of superheat.

Reason (R) : It reduces the work done by the compressor.

106. Ass~rtion (A) : When a thin flat plate is held parallel to a fluid stream, both pressure drag as well as viscous drag will be negligible

Reason (R):

107. Assertion (A) :

to pressure negligible.

erature exceeds 4°C, but he cooled below 4°C it floats

a~ the top.

Ice forms at the top of a pond in winter while bottom fluid stays warmer at more than 4°C.

108.

109.

Assertion (A) ·:

Reason (R) :

Assertion (A) :

Reason (R) :

The important property for a

liquid to use it as manometric

fluid is its colour for Visibility.

Inclined manometers are used

to measure low pressures.

An air

re of the

Stability of a floating body is

determined by the relative

position of the centre of gravity

and the centre ofbu.oyancy.

Reason (R) : If metacentre of the floating

body is above the· centre of

gravity ·of the body, then the

floating body will be in stable

equilibriu.rri.

111. Assertion (A): A floating body .of spherical

shape shall always .be in

neutral equilibrium condition.

Reason (R) : For a spherical floating body

the centre of gravity is always

above the centre ofbuoyancy.

Q-GUG·K-NFA 19 - A )

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112. Assertion (A): In free cylindrical vortex about 116. Assertion (A): When a circular cylinder is a vertical axis, pressure placed normal to the direction increases with distance from of flow, drag force is essentially ax1s and this increase is a function of the Reynolds proportional to square of the number of the flow. radial distance.

Reason (R) : Tangential velocity is inversely proportional to radial distance and energy of a fluid element is conserved m a free cylindrical vortex.

Reason (R) : As Reynolds number is about

100 and above, eddies formed break away from either side in periodic fashio

113. Assertion (A): The velocity potential provides 117. Assertion (A) :

an alternative means of expressing velocity

components.

Reason (R) : The existence of velocity potential m a flow field ensures that the flow must be irrotational:

114. Assertion (A); A pitot tube works ~ principle of convert·

115.

Reason (R) : The velocity ecelerates

rest at the ,...,_..,""'"t at the tip .of

a fully developed 'laminar flow through a pipe, velocity distribution across any section is parabolic in shape.

he water tube boilers are comparatively cheaper in first cost than fire tube boilers.

Single stage impulse steam turbines are not used in practice.

Reason (R) : Single stage impulse steam


turbines have very low revolutions per minute.

The performance parameter 'Polytropic efficiency' is used for axial flow gas turbines and air compressors.

Reason (R) : Polytropic efficiency is dependent on the pressure ratio.

120. ·Assertion (A) : Before starting a centrifugal The shear stress distribution pump it is to be properly,

0 -GUG-K-NFA

from the centre line of the pipe primed. upto the pipe surface increases linearly.

( 20- A)

Reason (R) : Priming provides lubrication to the propeller shaft.

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SPACE FOR ROUGH WORK

I .

. '

0-GUG-K-NFA ( 21 - A )

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. SPACE FOR ROUGH WORK

0-GUG-K-NFA ( 22 - A )

. .

...._____ _________ ·-··-·- --·- J

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SPACE FOR ROUGH WORK

•

.• r:

0-GUG-K-NFA ( 23,... A)

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------~--

SPACE FOR ROUGH WORK ·

... . -

0-GUG-K-NF.A ( 24 - A )

•

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------ --------------~------------------------------------------~

DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED _TO DO SO

T.B.C. : Q-GUG-K-NFB Test Booklet Series

Serial 036741

TEST BOOKLET

MECHANICAL ENGINEERING PAPER II

Time Allowed: Two Hours : 200

1.

INSTRUCTIONS IMMEDIATELY AFTER THE COMMENCEMENT OF THEE~ · . N, YOU SI:IOULD CHECK THAT THIS TEST BOOKLET DOES NOT HAVE~ ~NPRINTED OR TORN OR MISSING PAGES OR ITEMS ETC. IF SO, GET ~~ED BY A COMPLETE TEST BOOKLET. ·

2. ENCODE CLEARLY THE TEST BOOKLET SERIE BE IN THE APPROPRIATE PLACE IN THE ANS

, ORDAS THE CASE MAY T.

3. You have to enter your Roll Number on the Test Booklet in the Box provided alongside. DO NOT write anything else on the Test

4.

5.

6. 7.

8.

9. 10.

This Test Booklet cm1tains 120 ite~~ue ~ns). Each item comprises four responses (answers). You will select the responl w b you want to mark on the Answer Sheet. In case you feel that there is more t lfan e orrect response, mark the response which you consider the best. In any case, choos ON. ONE response for each item. You have to mark all your response NLY on the separate Answer Sheet provided. Sec directions in the Answer Sh All items carry equal marks Before you proceed to,..R'lark · t Answer Sheet the response to various items in the Test Booklet, you have to ~1\~ in sgme particulars in the Answer Sheet as per instructions sent to you with your Adm~o Certificate. . After you have co~ ~ filling in all your responses on the Answer Sheet and the examination ha co de , you should hand over to the Inv:igilator only the Answer Sheet. You are per 'tte to . e away with you the Test Booklet. Sheets fo ro ork are appended in the Test Booklet at the end. Penalty

THE \ LL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE IN THE OBJE~ I TYPE QUESTION PAPERS. . (i) n \ e are four alter natives for the answer to every question. For each question ,for which a wrong

an ver has been given by the candidate, one-third (0·33) of the marks assigned to that question will be deducted as penalty.

(ii) If a candidate gives more than one answer, it will be treated as a wrong answer even if one of the given answers happens to be correct and there will be same penalty as above to that question.

(iii) If a question is left blank, i.e., no answer is given by the candidate, there will be no penalty for that question.

DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED TO DO SO

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I.

-2.

z

X

Miller indices (x, y, z) for the hatched plane in the above unit cel1 are represented as

(a) (1 0 0)

(b) (1 1 0)

(c) (1 l 1)

(d) (1 0 1)

AI 300N IB ~10m >I<

200N •c.

25m

g moment diagrams for shown in figure. It can be

A couple of 2000 Nm acts at C

{d) A uniformly distributed load is confined to portion BC only

3.

0-GUG-K-NFB 2 - A

1

Consider the following sta reference to the four bar mec in the figure above :

At the instant consider

1.

2.

3.

(a)

(b)

(c)

1

(d) Steel S

. ~~~F Alumimum J

~--~~--------~

-B

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- -----------------------~----------------------------------------------~----------.

5.

6.

logT

The above figure shows a typical relationship between tool life and cutting speed for different materials. Match the graphs for HSS, Carbide and ·ceramic tool materials and select the correct answer using the code given below the lists :

·Code:

HSS

(a) 1

(b) 3

(c) 1

(d) 3

+ Input

(c) . - 0·2 .

(d) 0·25

Carbide Ceramic

2 3

2 1 .

3 2

1 2

5

e o s the block diagram of trol syst.em having bounded

becomes unbounded if the

0-GUG-K-NFB l 3- A}

20 N/cm

The natural frequency of the

(a) 100 N is increased to

(b) Stiffness of spri

(c) Weight is .reduce

0

(d)

0' '

A.,

~----a

B

A point m two-dimensional stress state, is

subjected to biaxial stress as shown in the

above figure. The shear stress acting on tne ·

plane AB is

(a)' Zero

(b) (J

(c) cr cos2 e

(d) (J sine • cos e

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9.

10.

-------

Velocity of the follower

Cam angl~ ...,.._._.

The above figure shows the required velocity profile for a follower ofa cam during its rise. If the driving cam is rotating at a uniform velocity, the nature of displacement recommended for the fol1ower is

(a) Cycloidal

(b) Simple harmonic

(c) Parabolic

(d) Uniform

(c)

(d)

400

676

800

programme

11. Match List I with List II and select the correct answer using the code given below

the lists :

List I (Symbols for direction of lay)

A. =

B. X

C. ·I

D. R

B

4 2

3 .2

(c) 4 1

(d) 3 1

c

1

1

2

2

List II (Surface texture)

1.

3.~

4 .•.

D

3

4

3

4

12. The correct statement is

(a) Characteristic of any series of alloys cannot be found by phase diagram.

(b) Phase diagram does not give amount of phases which are a function of composition, temperature and pressure.

(c) The phase may be liquid or vapour with ordered crystal structure.

Phase diagram provides the information I .

on how rapidly equilibrium is reached. (d)

Q-GUG-K-NFB ( 4- A)

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13. If, D = annual demand for a material (units 17. per year). Q = quantity of material ordered at each

order point (units per order). C = cost of carrying one unit in inventory

.for one year (rupees per unit per -year}.

S == average cost of completing an order for a material (rupees per orde_r).

TSC = total annual stocking costs for a material (rupees per year).

Then, the economic order quantity (EOQ) is

Plastic material is used for the component which requires characteristics of

(a) Low density, machinability and hign strength

(b) Machinability, high strength and large plastic deformation

(c) High strength, large plastic deformation and low density

(d) Low density, machinability plastic deformation

(a) J2 ~s 18. In project. scheduling,

advantage over Gantt cha

14.

15.

16.

(b) 2DC s

(c) ~

(d)

(a)

(b)

(c)

(d)

2DS c

The cutting tool rna high temperature · (a)

(b)

(c)

(d)

· c project duration can be reduced hing

(a) One or more non-critical activities (b) One or more critical activities only (c) One or more dummy activities only (d) Activities having independent float

0-GUG-K-NFB ( 5 - A )

(a) show start an fin· r-of ·an activity

(b)

(c)

clearly

oxides of

Ground, sintered and palleted to make ready ceramics

(c) Ground, washed with acid, heated and cooled

(d) Ground, sintered, palleted and after calcining cooled in oxygen

\

Consider the following properties for plastics :

· 1. Become hard on heating.

2. Increasing plasticity.

3. Ability to deform with nse m temperature.

4. Long chain structure.

Which of these properties for plastics are correct?

(a) 1, 2, 3 and 4

(b) 3 and 4 only

(c) l and 4 only

(d) 2, 3 and 4 only

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21. Which of the following is not - the 24. In the moving average method of forecasting, the number of periods (AP) of data is dependent on the

characteristic of exponential smoothing method of forecasting?

(a) This represents a weighted average of the past observations.

(b) All observations are assigned equal weightage.

(a) Criteria of accuracy only

(b) Impulse response only

(c) Noise damping only

(d) Criteria of accuracy, impulse response and noise damping

(c) If smoothing coefficient is 1 then the latest forecast would be equal to 25. previous period actual demand.

Consider the following state composite materials :

(d) The technique is not simple as compared to moving average method.

22. In exponential smoothing method of forecasting, the forecast for higher values of the smo-othing constant

(a) will be more sensitive to forecast of the. previous period

(b) will be more sensitive to changing patterns in demand

(c) will not be affected by the the previous period

(d) will not be affected patterns in demand

23. Consider the following stat

The bearing characterist

1.

2.

3.

4. t of journal radius.

1 and 3 only

(c) 1 only

(d) 1, 2, 3 and 4

1. Material is composite, if fis ar oriented and c ntmuo .

2. Reinforced fi~ rass products are strong and light weight.

3. Cone te e~forced with steel rebar, b omes matrix.

steels are composite materials.

·-c!..\.of. e above statements are correct ?

i~ and 3 only

2, 3 and 4 only

1, 2 and 4 only

1, 2, 3 and 4

Some high speed steels have cobalt (Co) added to them in amounts ranging from 2% to 15%, since this element improves the ·

(a) Cutting efficiency, especially at high temperature

(b) Depth hardening ability of the HSS tool

(c) Red hardness of the HSS tool

(d) Grain structure of the HSS tool

27. A dealer for washing machines forecasts the demand at the rate of 600 units per month, for the next four months. The actual demand is found to be 500, 680, 800 and 900 units .. The mean absolute deviation (MAD) and the BIAS are found to be

(a) 170 and - 1.20

(b) - 120 and 170

(c) 340 and - 240

(d) - 240 and 340

0-GUG-K-NFB 16-A)

~--------------------------------- -

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28. Value engineering is necessary to be used 31.

when fo1lowing symptoms are indicated

1. New product designs are to be introduced.

2 . The firm is unable to meet delivery date.

3. Rate of return on investment goes down.


(a) 1, 2 and 3

(b) 2 only

(c) 1 and 3 only

(d) 2 and 3 only

29. The relationship between the shear angle <l>,

the friction angle p and cutting rake angle

a is given as

(a) 213 + <1> - a "" C

(b) 2<1> + p - a "" C

(c) 2a + 13 - <1> = C

• 30. mainly used in

(c) Ductility

(d) Weldability

0-GUG-K-NFB ( 7 -A l

•

. ZN In journal bearing design, th e factor - is

p

called the 'Bearing characteristics number'

where Z = absolute viscosity of the lubricant,

N = speed of journal in rpm and p = bearing

pressure on the projected bearing area. The

value of ZN corresponding to the p .

amount of fi·iction is calle

·modulus 'K'. For hydrody

the bearing, ZN should p

(a) Larger than K

(b)

(c)

· er the following statements :

od dynamic performance is usually difficult

to achieve in robots which contain a rotary

base because

1. Position, speed and acceleration of the other joints cause variations in the reflected torque and moment of inertia.

2. The moment of inertia reflected at the base depends upon the weight of ~he object being carried .

3. The moment of inertia reflected at the base also depends upon the distance between the base axis and the manipulated object.


(a) 1, 2 and 3

(b) 2 and 3 only

(c) 1 only

(d) 1 and 3 only

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33. The ratio of the core of a rectangular 36.

section to the area of the rectangular section when used as a short column is

(a)

(b)

(c)

(d)

1

9

. 1

36

1

18

1

24

34. In relation to product . flexibility and

production volume achieved in computer

35.

control1ed manufacturing systems, the 37. flexible manufacturing system has

(a) High flexibility in types of product but low volume of production

(b) Moderate product flexibility moderate production volume

(c) Low product flexibility production volume

(d) Extremely low product low production volu~e

ouble the speed of the workpiece

(d) 65 to 75 times the speed of the workpiece

38.

0-GUG-K-NFB ( 8 -.A)

Match List I with List II and select the correct answer using the code given below the lists :

A.

B.

C.

D.

List I List II (Quenching (Structure

media) produced)

Water

Oil

Air

Furnace coal

1. Coarse pearlite

2. Martensite

3.

·4.

Code:

A

(a) 1

(b) 2

(c) 1

(d) 2

B

3

3

2

1

these is/are used. as quenching media in case of Alloy steels?

(a) 1, 2 and 3 only

(b) 2, 3 and 4 only

(c) 1 and 4 only

(d) 4 only

The linear programming is optimization problems which fol1owing conditions :

used satisfy

for the

· 1. . Objective function expressed as a linear function of variables.

2. · Resources are unlimited.

3. The decision variables are inter-related and non~negative.


(a) 1, 2 and 3

(b) 2 and 3 only

(c) 1 only

(d) 1 and 3 only

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39. Consider the following statements : 41. Consider the following statements :

1. For the application of optimality test in case, of transportation model, the number of allocations should be equal to m + n, where m is the number of rows and n is the number of columns of the matrix.

2. T~ansportation problem is a special case of a linear programming problem.

3. In case of assignment problem the first step is to make a square matrix by adding a dummy row or a dummy column.

Which of the above statements .is/are correct ?

(a) 1, 2 and 3

(b) 1 and 2 only

(c) 2 and 3 only

(d) 2 only

40. Match List I with List II and select the correct answer using the code given below the lists : 42.

List I List II (Type (Manufacturing) of work)

A. High rate production of worm gears and worm wheel

B. Generating . internal gears and cluster gears

3- 1

(c) 2 4

(d) 3 4

1. Gear shavi

4. Gear shaping

c D 4 3

4 2

1 3

1 2

43.

0-GUG-K-NFB { 9 - A )

Helical gears may be designed in applications where gears are to be mounted on

1. Non-parallel shafts.

2. Parallel shafts.

3. Intersecting shafts.

4. Non-parallel shafts.

Which of the

(c)

(d)

and

• ducing both i1,1ternal and external eads, ~the method used is

chasing with multiple-rib chasers

(b) Thread milling with n:mltiple"thread cutters

(c) Thread tapping with taps

(d) Die threading with self-opening die heads

In turning a solid round bar, if the travel of the cutting tool in the direction of feed motion .is 1000 rom, rotational speed of the workpiece is 500 rpm, and rate of feed is 0·2 mm/revolution, then the machining time will be

(a) · 10 seconds ·

(b) 100 seconds

(c) 5 minutes

(d) 10 minutes

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44. - 47. In the Kendall's notation for repre~enting

queuing models the first position represents

The effect of centering errot when the tool is

set above the center line as shown in the figure results effectively in

1.

2.

3.

4.

Increase in rake angle.

Reduction in rake angle.

Increase in clearance angle.

Reduction in clearance angle.

Which of these statements is/are correct?

(a) 1 only

(b) 1 and 4 only

(c) 2 and 4 only·

(d) 1, 2, 3 and 4

45. If the princl.pal stresses and maximu shearing stresses are of equal numerical valu at a point in a stressed body, the st , o~

stress can be termed as

(a) Isotropic

(b) Uniaxial

(c) Pure shear

(d)

46. Consider the follow g statements :

In an ~rthogona i le-toint metal cutting,

(a) Probability law for the arrival

(b) Probability law for the service

(c) Number of channels

(d) Capacity of the system

48. · Consider the following

annealing process :

1.

2.

below upper ·critical

can be done in heat treating

cee, by heating it, keeping the metal

it and turning off furnace till it cools

o room temperature.

Uniform grain structure is resulted.

Which of these statements are correct ?

(a) 1, 2. and 3 only

(b) 2, 3 and 4 only

(c) 1, 3 and 4 only

(d) 1, 2, 3 and 4

as the side- 't · dge angle is increased, 49. Weldability of ferritic stainless steel used in automotive exhaust system is improved by

selecting stainless steel electrode having low content of

1.

2.

these statements are correct ?

1 and 2 only· .

(c) 2 and 3 only

(d) 1, 2 and 3

0 -GUG-K-NFB { 10- A )

(a) Carbon

(b) Nitrogen

(c) Chromium

(d) Carbon and Nitrogen

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50. · In assignment problem for variable xij :

1. x .. = 1 or 0 IJ

2.

3.

n

I j=l

n

I i=l

x .. = 1 IJ

x .. ;:: 1 IJ

Which of these are correct ?

(a) 1, 2 and 3

(b) 2 and 3 only

{c) 1 and 2 only

(d) 1 and 3 only

0


52.

Use of functions

1. Helps to avoid . repeating a set of statements many times.

2. Enhances the logical clarity of program.

3. Makes the debugging task easier.

Which of the above statements correct ?

{a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

s + 1

{c) s - 1

(d) 1 - s

•• c ion of a closed loop

is equal to 1 - ..!:. . If s

forward

53. The hardness of lathe bed ma terial should

be measured by

54.

56.

(a) Rockwell tester

(b) BrineH hardness tester

(c) Shore Scleroscope

(d) Vickers hardness tester

Consider the following parts : ~ 1.• Grinding wheel 0 2. Brake lining

3. Self-lubricating bear.

Which of the by powder

(a)

1 and 2 only

Pearlite phase m an iron-carbide phase diagram is

(a) Eutectic phase

(b) Hypoeutectic mixture

(c) Eutectoidal mixture

(d) Hypereutectic phase

The purpose of getchar ( ) function in C

language is to

(a) Write a single character at a time

(b) Read a single character at a time

(c) Copy a single character at a time

(d) Delete a single character at a time

0-GUG-K-NFB ( 11 ...,. A )

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57. The equation of motion for a single degree of 61. freedom system with viscous damping is


1. Crystal structure 16x + 5x + 4x = 0. The damping ratio of the system is

(a)

(b)

(c)

{d)

5 64

5

16

5

4J2 2

5

58. The efficiency of a power screw is a function of

59.

60.

1.

2.

Screw geometry.

Coefficient of friction.

3. Load on the screw.

Which of these are correct ?

(a) 1, 2 and 3

(b) 1 and 2 only

(c) 2 and 3 only

(d) 1 and 3 only

(a) Decreases

(b)

(c)

(d)

e total

~ro a ility law that determines the t ions of fraction defective is

(b) Nonnal

(c) Binomial

(d) Exponential

62.

2. Relative size

3. Chemical affinity

4. Valency

Which of these factors govern relative solubility of two metals in each -- er in the solid state ?

(a) 1, 2 and 3 only

(b) 2, 3 and 4 only

(c) :t, 2 and 4 on

(d) 1, 2, 3 and 4

• nt printf ("%d", (a++)); of C nguage will print

An error message

Tool life is affected mainly with

(a) Feed

(b) Depth of cut

(c) Coolant

(d) Cutt;ing speed

64. In a 4-cylinder 4-stroke inline IC engine the angle between two successive cranks should be 180°. But this rule is violated for cranks 2 and 3 (i.e. inner cranks) and the angle is made 0°. This is done to achieve primary force

(a) and secondary force balancing

(b) ,and secondary couple balancing

(c) primary and secondary couple balancing

(d) secondary force and primary couple balancing

0-GUG-K-NFB 12 - A )

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It is wedged shape. 1.

.2. Its width 1s tapered but thickness is uniform.

3. It is subjected to tensile force.

Which of these characteristics of a ·cotter are correct?

(a) 1 and 3 only

(b) 1 and 2 only

. (c) 2 and 3 only

(d) I, 2 and 3

66. Which one of the following statements is' not correct for the TQC ?

(a) It is about the product quality and quality of all business processes.

(b) It is restricted to product quality.

(c) It utilizes quality circles.

(d) It utilizes zero defect programmes.


Alloying elements are added to

1.

2.

Improve hardness an

Corrosion and

• 3. ity and

4.

(c) 1, 2 and 4 only

(d) 1, 2, 3 and 4

resistance

68. The lead time m material requirements planning is the time between

69.

(a) Floating the tender and rece1vmg the quotations from the vendor

(b) Floating the tender and piacing the purchase order to the vendor

(c) Floating the tender and material from the vendor

(d)

(a)

(b)

(c)

•

the

' e output of the gjven program fragment is

Char * S1 == "Makeover'';

Char * S2 == ''Take";

* s2 = * 81; Printf (''%S", 8 2);

(a) Makeover Take

(b) Make

(c) Makeover

(d) Error

71. Surface imperfections which separate two orientations that are mirror image of one another is called

(a) Stacking fault

(b) Grain boundary

(c) Tilt boundary

(d) Twinned boundary

O·GUG-K·NFB ( 13 - A l

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72. In an inert gas welding process, the commonly 76. used gas is

(a) Hydrogen

(b) Oxygen ·

(c) Helium or Argon

(d) Krypton

The following information is added in updating·the inventory status file in MRP :

(a) Disbursement of inventory

(b) Scrap reported for material

(c) Order release

(d) Material received

73. An allotropic material has 77. In arc welding, the arc length s

to ·

(a) Fixed structure at all temperatures

(b) Atoms distributed in random pattern

(c) Different crystal structures at different temperatures

(d) Fixed structure but random atom 78

_ distribution

74. If the ratio of the length of a connecting rod to the crank radius increases then

(a) Primary unbalanced forces decrease

(b) Primary unbalanced forces increase

(c) Secondary unbalanced forces de r se

(d) Secondary unbalanced fore

75. Consider the following :

In a flow chart, terminal

(a)

{b)

(c) 1·5 times the

(d)

Both the material and the safety stock

The following is the general policy for A class items in ABC analysis :

1. Very strict control.

2. Frequent review of their consumption.

3. Safety stock kept.


(a) 1 only

(b) 1 and 2 only

(c) 2 only

(d) 1, 2 and 3

80. If the speed of the engine varies between 390 and 410 rpm in a cycle of operation, the coefficient of fluctuation of speed will be

(b) 2, 3 and 4 only

(c) 1, 2 and 4 only

(d) 1, 2, 3 and 4

0-GUG-K-NFB

(a) 0·01

(b) 0·02

(c) 0·04

(d) 0·05

( 14- A )

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81. Consider the following statements : 84. Consider the followiqg. statements :

82.

83.

. MRP constitutes a set of techniques that use

1. Bill of material.

2. Inventory data ..

3. Master production schedule.


(a) 1, 2:and 3

{b) 1 and 3 only

(c) 2 and 3 only

(d) 1 only

The ratio between Oxygen and Acetylene

gases for neutral ~arne in gas welding is

(a) 2 : 1

(b) 1 : 2

{c) 1 : 1

(d) 4 : 1

Consider the following statements regardi welded joints :

1. It is a pennanent type ofjoint.

2.

vessel construction.

3. It is free

stresses.

4.

5.

(b) 2, 3 and 4 only

(c) 1, 2, 3, 4 and 5

(d) 1, 2 and 5 only

85.

0 -GUG-K-Ni=B ( 15 - A )

The speed imbalance between meJDory access and CPU operation can be reduced by

1. Memory interleaving.

2. Reducing the size of memory.

3. Cache memory.

Which of the above statements is/are co

(a) 1 only

(b) 2 only

(c) 1 and'3 only

(d) 1, 2 and 3

Consider the ollowing_ a vantages of shell mould castin •

1.

2.

1, 2 and 3 only

2, 3 and 4 only .

(c) 1, 2 and 4 only

(d) 1, 2, 3 and 4

ES = 5 ES = 10

LS =5 LS = 15

ES = 18 ES!: 28

LS = 23 LS = 33

Consider the 3 activities of a- CPM network as shown above. Earliest .,_ and latest occurrence times of these events are given on the nodes. The total float on activity 20- 30 is

(a) 0

(b) 2

. (c) 3

(d) 5

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87. Iron-ca rbon equilibrium diagram

(a) correlates the microstructure and

properties of steel and cast iron

(b) indicates the phase changes occurring during heating and cooling

· (c) is made by plotting carbon percentage

along X-axis and temperature along

Y-axis

(d) All of the above

88. A shaft transmits 1000 kW of power ·at 100 rad/s. Then the torque transmitted in kNm is

(a) 0·1

(b) 1·0

(c) .10·0

(d) 100·0

89. During ·the ob, the r eprese11tative time, and allowances are observe

120% and Hl~\ of standard time respectively. T rna time and .standard

respectively

'(d) 0 ·7 and 0·8

90. Match List I with List II and select the correct answer using the code given below the lists :

List I List II

A. Point of 1. Strain energy inflection

B. Shearing strain

c. Section modulus

D. Modulus of resilience

Code: • c D

·2 4

4

3

2

2

2

3

3

1

4

. 1

In PERT and CPM network the dummy activity

(a) consumes time

(b) consumes resources .

(c) is used to preserve the logic

(d) is a real activity

92. For a proper design and longer gear fife

{a) Wear load must be more than dynamic load

(b) Wear load must be less than dynamic loa"d

(c) Dynamic load must be more than endu.rance strength

. . (d) · Wear 'load must be less than endurance

strength

0 -GUG-K-NFB ( 16 A l

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93: In a multiple-disc clutch, the axial intensity of 98. pressure is not to exceed 0·2 MPa. The inner radius of the discs is 100 mm and is half the outer radius. The axial force per pair of contact sw-faces in N is

(a) 2000 n

(b) 3000 n

(c) 4000 n

(d) 6000 1[

94. Metallic powders can be produced by

(a) Atomization

(b) Pulverization

(c) Electro-deposition. process

(d) All of the above

95. If the probability of an acceptance of a 1% 99. defective lot is 0·95, then AOQ is

(a) 0·01

(b) 0·10

(c) 0·0095

{d) 0·095

96. The leaning basic variable in simplex method is the basic variable that (a) has the lowest value (b) has the largest coefficient in

row

(c) has the smallest coefficient i row

Consider the following. statements

1. Resource limitations must be known.

2. Relationship of variables must be known.

Which of these statements must be satisfied to deal with the graphical techniques of linear programming effectively ?

(a)

(b)

(c)

(d)

1 only

2 only

Neither 1 nor 2 G are preferred over

bearings m some

be carried at

Higher loads are to be carr~d at relatively low speed

(d) They are available 'off the shelf in the market

(d) goes to zero first as variable is increased

100. Which one of the following statements 1s

not correct ?

97.

f the above statements is/are correct ?

1 and 2 only

2 and 3 only (c) 1 only

(d) 1, 2 and 3

0-GUG-K-NFB I 17- A)

(a) PERT is probabilistic whereas CPM is

deterministic.

(b) In PERT slack on various events is

calculated whereas in CPM floats are

calculated.

(c) Critical path in a network is the path on

which events have no slack.

(d) More than four dummy activities cannot

be used in a PERT network.

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Directions : Each of the next twenty (20) items 104. Assertion (A) : Most of the materials exist in

· consists of two statements, one labelled g,s the single crystal. 1

'Assertion (A)' and the other as 'Reason (R)'. You are

to examine these two statements carefully and select

the answers to these items using the codes given

below:

Reason (R) : Sugar is

material.

a single crystal

105. Assertion (A) : Polycrystalline material is Codes:

(a) Both A and R are individually true and R is the correct explanation of A

(b) Both A and R are individually true but R is not the correct ~xplanation of A

(c) A is true but R is false

(d) A is false but R is true

101. Assertion (A): In damped vibration there is

decrease m amplitude of

vibration during

successive cycle.

Reason (R) : Damping force is

to the amplitude.


Reason (R) :

Reason (R) : Crystals

respect to

ea

Natura crystals

· ntain defects.

always

affect colour

and can make a crystal a

valuable gem.

ssertion (A) : Plastic deformation IS a

function of applied stress,

temperature and strain rate.

Reason (R)' : Plastic deformation is

accompanied by changes in

both the internal and external

state ofthe material.

Sh · ar strenb'th of cast iron in + 108. Assertion (A) : In the high energy rate ~Q1I1Jll~1ess10n is more than half

A plane state of stress always

results in a plane state of

strain.

Reason (R) : A uniaxial state of stress

results in a three-dimensional

state of strain.

0-GUG-K-NFB ( 18 - A }

forming method, the explosive

forming has proved to be an

excellent method of utilizing

energy at high rate and

utili7.es .both the high

explosives and low explosives.

R eason (R) : The gas pressure and rat e of

detonation can be controlled

for both types of explosives.

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109. Assertion (A) : Pickling and washing of rolled 113. Assertion (AJ : It is generally difficult to weld

Reason {R) :

rods is carried out before wire

drawing.

They lubricate the surface to

reduce friction while drawing

wires.

110. Assertion (A): The investment casting is used

for precision parts such as

turbine plates, sewing

machines etc.

Reason (R) : The investment castings have

a good surface finish and are

exact reproductions of the

master pattern.

111. Assertion (A): Oxidizing flame is used in gas

welding to join medium carbon

steels having high meltin

Reason (R) :

point.

produces

temperature

neutral d reducing flame. • IS always

for Carbon-

Carbon arc is stable in straight

polarity.

Reason (R) :

Aluminium parts by normal

arc welding process.

Hard and brittle

Aluminium-oxide film lS

formed at the welded joints.

114. A.<Jsertion (A):

Reason (R) :

115.

Reason (R) :

torque.

e similar to number

ys provided on a

rcumference of the shaft.

In design of friction clutches

the torque transmission

capacity is predicted from the

condition of uniform rate of

wear of friction plate. ·

With the use of hard materials

for the friction lining these is

always perfect geometrical fit

between two surfaces and

hence pressure distribution

over the contact zone is not

uniform.

116. Assertion (A) : A state of plane strain always

results in plane stress

conditions.

Reason (R) : A thin sheet of metal stretched

in its own plane results m

plane strain conditions.

Q-GUG-K-NFB ( 19 - A l

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117. Assertion (A): Climb or down milling 119. Assertion (A) : Inert gas and bare electrode operation · ensures smoother instead of flux coated electrode operation of the machine tool is used in the case of automatic and longer tool life as TIG and MIG welding compared to the conventional processes.

Reason (R) :

up milling operation.

In climb or down milling operation, the rotational motion of the cutter as well as the feed motion of the work-piece are in. the same direction, and the depth of cut is maximum at the entry point as the cutter engages the work-piece.

118. Assertion (A) : Longitudinal cutting motion of the tool and cross-wise feed motion of the job generates flat surfaces in planing process.

Reason (R) : Jobs used in planing machines are generally long and he , compared to shaping.

Reason (R) : Better protection is provided by a cloud of inert gas than the cover created by the-flux.

120. Assertion (A) : Indirect

Reason (R) : a Clressing enables ased computation m

<Z'igl) level languages.

fl}G

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0-GUG-K-NFB ( 21 - A )

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SPACE FOR . . . ' . K . . . ROUGH WOR

' . . ' .

. · .. · · · . ~ .. . · .· . . .uo .

. · . · .. ··. e,·

. . ~· .

' .

' . . . '

. '

0-GUG-K-NFB ( 22- A)

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SPACE FOR :R : OUGH WORK

. . CJ .

. cJo· · ~f'lj

. 0~ . ' '

·~

. Q-GUG-K-NFB l 23 - A)

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0-GUG-K-NFB ( 24 - A )

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