INDIAN SPACE RESEARCH ORGANISATION
MECHANICAL ENGINEERING I
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10F'll
SET·D
1 The ultimate tensile strength and yield strength of most of the metals, when temperature falls
from 0 to -150°C wiII
Increase Decrease Remain same First increase and then decrease
2. "Troosite" is obtained when
Quenching steel during transformation
A fully hardened steel is finally drawn at about 677 0 C
Steel is rapidly quenched in oil
When alloy steels are rapidly quenched in water
3. Induction hardening is the process of
Hardening the core Uniform hardening
Selective Hardening surface for wear resistance
4. Heavy water is used in atomic power plants as
Fuel Source of energy Lubricant Moderator
5. Which one is not the purpose of heat treatment of steels?
Changing the composition of steel on the surface
Changing the percentage of carbon and Si in the bulk
Increasing or decreasing the grain size
Removing undesirable residual stresses
6. A cold chisel is made of
Mild steel Cast iron H.S.S. High carbon
7. A body which is permanently deformed is said to have undergone
Elastic deformation Limit of elastic deformation
Plastic deformation Uniform deformation
8. The defect responsible for the phenomena of slip, by which most metals deform plastically, is
known as
Fracture Twinning Dislocation Strain hardening
9. With a punch for which the maximum crushing stress is 4 times the maximum shearing stress
of the plate, the biggest hole that can be punched in the plate would be of diameter equal to
..!.. x Thickness of plate
4
Plate thickness
1
X Thickness of plate
2
2x plate thickness
10. For traction applications, the type of motor best suited is
Induction motor Synchronous motor DC shunt motor DC series motor
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INDIAN SPACE RESEARCH ORGANISATION
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_2008 MECHANICAL ENGINEERING I SET-D
11. On loading a ductile material in excess of a certain value, gradual increase in elongation occurs
with time. Such phenomenon is known as
Creep Fatigue Stress concentration None of the above
12. The failure OCcurs at a point in a member, when the maximum shear stress in a bi-axial stress
system reaches the shear stress at elastic limit in simple tension test, This is according to
Rankine's theory Guest's theory Lame's theory None of the above
13. The function of a washer is
To fill the axial gap
To absorb shocks and vibrations
To provide cushioning effect
To provide bearing area
14. Surface endurance limit of gear material depends on its
Surface hardli.ess Modulus of elasticity Elastic strength All of the above
15. A double strap butt joint is always in
Single shear Double shear Either single or double shear None ofthe above
16. 2x dy
If tan ,then is
I-x2 dx
2

I +x2
2

I-x
I

I+x 2
17. Rivets are made of
Soft material Hard material Ductile material Brittle material
18. The purpose of providing multiple collars on a flat collar pivot bearing is to
Increase frictional resistance
To establish self-sustaining bearing conditions
Distribute the frictional load because of limiting friction
Distribute the axial load because oflimiting bearing pressure on a collar
19. Angle of dwell of cam is defined as the angle
during which the follower returns to its initial position
of rotation ofthe cam for definite displacement ofthe follower
through which the cam rotates during the period in which the follower remains in the highest
position
moved by the cam from the instant the follower begins to rise, till it reaches its highest position
20. The supply of working fluid to the engine to suit the load conditions is controlled by
Meyer's expansion valve-- D-slide valve Governor Throttle valve
Mechanical I SET-D


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INDIAN SPACE RESEARCH ORGANISATION
MECHANICAL ENGINEERING I
Page:
30f"11
·SET-D
21. A pantograph is a device that reproduces a displacement
On the same scale On any scale On reduced scale On enlarged scale
22. In the case of gyroscopic effect, the planes of spin, gyroscopic couple and precession are
In same plane In different planes
Any two in perpendicular planes and third in Mutually perpendicular
different plane
23. Which of the following is a lower pair?
Piston and cylinder Cam and follower Belt drive Gear
24. Match List-I (measuring Devices) with List-II (Measuring parameter) and select the correct ans"
using the codes given below the lists
Device
A Pitot tube
B Micro-manometer
C Pipe bend meter
D Wall ressure ta
Parameter
1 Flow static pressure
2 Rate of flow (indirect)
3 Differential pressure
4 Flow staanation ressure
A
I
4
1
4
B
3
3
2
2
C
2
2
3
3
D
4
1
4
1
25. The following data pertain to a worker: base rate =Rs. 20 per hour
Time taken for completing the job hours
Standard time =3hours
Under Halsey plan the total earning of the worker is
Rs. 36.67 Rs.40.67 Rs.46.67 Rs.56.57
26. What is the correct sequence of the following parameters in order of their maximum to
minimum influence on tool life?
1. Feed rate
2. Depth of cut
3. Cutting speed
Select the correct answer using the codes given below

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INDIAN SPACE RESEARCH ORGANISATION
MECHANICAL ENGINEERING I
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40F 11
27. Given that cutting speed m/min, the return time to cutting time ratio is 1:2 the feed rate
0.3 mm/stroke, the clearance at each of cut 25 mm and that the plate Is fixed 700 mm side
along the direction oftool travel, the time required for finishing one flat surface of a plate of
size 700 x 300 mm in a shaper, will be
10 min 12.5 min 15 min 20 min
28. The least count of a metric vernier caliper having 25 divisions on vernier scale, matching with
24 divisions of main scale main scale divisions= 0.5 mm )is
0.005 mm 0.01 mm 0.02 mm 0.005mm
29. Standards to be used for reference purposes in laboratories and workshops are termed as
Primary standards Secondary standards Tertiary standards Working standards
30. For achieving a specific surface finish in single point turning the most important factor to be
controlled is
Depth of cut Cutting speed Feed Tool rake angle
31. Interchangeability can be achieved by
Standardisation Better process planning Simplification Better product planning
32. The centre and radius of the circle 3i)z 9 0 are
..
33. Enlarging an existingdrcular hole with rotating single point tool is called
Boring Drilling Reaming Internal turning
34. Plug gauges are used to
Measure the diameter of the workpieces
Measure the diameter of the holes in the workpieces
Check the diameter ofthe holes in the workpieces
Check the length of holes in the workpieces
35. Basic shaft and basic hole are those whose upper deviations and lower deviations respectively
are
Zero,Zero None ofthe above

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2008
INDIAN SPACE RESEARCH ORGANISATION
MECHANICAL ENGINEERING I
Page:
SET·D
36. The general equation of continuity for three-dimensional flow of a compressible fluid for steady
flow is (where ware components of velocity in x,y and z directions respectively)
au 8v aw
ax Oy az
au 8v aw
ax Oy az
au av ow 0
ax Oy az
ou av aw
ax Oy az
37. The density of air at 10° C and IMPa abs, in SI units is
1.231 12.31 118.4 65.0
38. In centrifugal pumps, maximum efficiency is obtained when the blades are
Straight Bent forward Bent backward radial
39. If the characteristics of a pump are as shown in fig. What
is represented by abscissa
Head
Discharge
RPM
Power
40. A rocket exists exhaust gases with p =0.5kg m3 out a 50 em diameter nozzle at a velocity of
1200 m/s The thrust, is
420 kN 280 kN 140 kN 90 kN
41. Which of the following pairs of velocity components u and v satisfy the continuity equation for
a two dimensional flow of an incompressible fluid?
u 2 3y V -3xy
u=Asinxy;v=-Asinxy
42. The flow of a fluid in a pipe takes place from
Higher level to lower level
Higher pressure to lower pressure
u
u ex; v
Small end to large end
Higher energy to lower energy
43. An aeroplane is flying at an height ofI4km where temperature is -450C. The speed of the
plane is corresponding to M=2. Find the speed of the plane if R=287J/kg K and r 1.4 .
2179km/h 3010 km/h J250km/h 3379km/h
Dl
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MECHANICAL ENGINEERING I
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44. Pipe branches to three pipes as
shown in the given figure. The areas
and corresponding velocities are as
given in the following table
The value ofV2 in cm per second will
be
Pipe Velocity Area
(em per second) (sq em)
I. 50 20
2. V2 10
3. 30 IS
4. 20 10
15 20 30 35
45. The pressure difference measured by a mercury oil differential manometer on the two sides of
the orifice meter gives a reading of 50 em of mercury. Determine the differential pressure head
in orifice. Take the specific gravity of oil as 0.9.
7.05 ill of oil 5.05 m of oil 4.75 m of oil 3.35 ill of oil
46. The transition Reynolds number for flow over a flat plate is 5 X 105
• What is the distance from
the leading edge at which transition will occur for flow of water with a uniform velocity of
(For water, the kinematic viscosity, v=0.858 X 10-6
1 m 0.43 m 43 m 103 ill
47. Pipes of lengths 11 ,12 etc and diameters dl d2 etc are connected in series. A single pipe of
length II +12 +13 ..... having same pressure loss as all pipes in series will have diameter eq ual
to

48.


Let x have the density function
p 2 is
if X 1
. Then the probability
otherwise
68.75% 31.36% 95% 60.7%
49.lfthermal conductivity ofa material varies as temperature at the center ofa 10 em
thick wall of material will be
Average ofthe temperature at two ends ofthe wall
More than the average ofthe temperature at two ends ofthe wall
Less than the average ofthe temperature at two ends ofthe wall
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2008
INDIAN SPACE RESEARCH ORGANISATION
MECHANICAL ENGINEERING I
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SET-D
Depends on the range of temperature
50. What is the net radiant interchange per square meter for two very large plates at temperatures
800 K and 500 K respectively? (The emissivity of the hot and cold plates are 0.8 and 0.6
respectively. Stefan Boltzmann constant is 5.67*1O-sW/m2 K4

kW
10.26- 2 m
kW
1.026- 2 m
kW
102.m6-7-
kW
1026-7
51. A 10 kg solid at 100°C with a specific heat of 0:8kJ/kg.oC is immersed in. 40 kg of 20°C liquid
with a specific heat of 4.0 kJ/kg °C. Estimate the temperature after a long time if the container
is insulated?
52. spherical shaped vessel of 1.4 m outer diameter is 90 mm thick Find the rate of heat leakage,
if the temperature difference between the inner and outer surfaces is 220°C. Thermal
conductivity of the material ofthe sphere is 0.083 W/m K.
0.2 kW 0.5 kW 1.088 kW 1.6 kW
53. is equal to oV T aT p op v
Zero 1 Infinity
54.. A well insulated vessel containing air is heated to double the pressure and temperature 150% in
excess of initial. The amount of air that leaked is
20% 22.5% 25%
55. An unconstraint thin circular disc has a concentric hole in it. On heating the diameter of the
hole will
increase decrease Remain constant first increase then decrease
56. The specific heat of diatomic gas at constant pressure is given' by R universal gas constant
and M molecular weight of gas)
5 R

2M

2
7 R

2M
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INDIAN SPACE RESEARCH ORGANISATION
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57. The variation of temperature inside a wall is shown by three different
curves. In which case thermal conductivity least varies with
temperature T
l

A
B
C
Cannot be ascertained on the basis of information provided
58. Kinetic energy of the molecules in of absolute temperature is proportional to
T r T2 -Ji
59. Vhich type of heat exchanger an automobile radiator is?
Parallel flow type Counter t10w type Regenerator type Cross flow type
6O.Given that Nu=Nusselt number, Re= Reynolds number, Pr= Prandtl number, Sh= Sherwood
number, Sc Schmidt number and Or Grashoffnumber. The functional relationship for free
convective heat transfer is given as,
Nu Pr) Sh Or) Nu Pr) Sh Sc)
61. The quantity of heat required to change the temperature of 1 gm of ice from 6° C to SO Cis
known as
Latent heat of
freezing
Freezing heat Heat of vaporization Specific heat
62. The spectral energy distribution for a body at temperature Tis d
shown in figure. Now if the temperature of the body is increased
Am Will shift towards right
Am will shift towards left
The total energy emitted by the body will decrease
Am will remain the same but Em will increase Am Ie
63. When K is the thermal conductivity, r is the density and C p is the specific heat of a substance,
then thermal diffusivity is given by
K

r.Cp
K.Cp
r
r.Cp
K.r

p


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MECHANICAL ENGINEERING I
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64. The determinant of the matrix
0 1
°l 00
o 1
-42
is
-68
65. A thin copper wire at 300° is suddenly immersed in water at 30°C. It cools down to 150°C in 70
seconds. It is then reheated to the initial temperature of 300°C and suddenly exposed to air at
30°C where it cools down to 150°C in 200 This difference in cooling time is due to
Larger specific heat of water
Smaller heat transfer coefficient in water
Larger heat transfer coet1icient in water
None ofthe above
66. A heavy block of mass m is slowly placed on a conveyer belt moving with speed v. If coefficient
of friction between block and the belt is JL, the block 'will slide on the belt through distance
v

J-lg

J-lg
67. A car moving with speed u can be stopped in minimum distance x when "brakes are applied. If
the speed becomes n times, the minimum distance over which the car can be stopped would take
the value
x

n
nx
x

n 2
68. Speed of particle executing simple harmonic motion with amplitude a is half of the maximum
speed. At that instant, displacement of the particle is
a

2
.J3 a
2
2a
-13 3.fia
69. Two blocks with masses M and
m are in contact with each other
and are resting on a horizontal
frictionless floor. When horizontal
force is applied to the heavier, the
blocks accelerate to the right. The
force between the two blocks are

m
MF
m
F M
m
mF

M
mF

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SET D

70. A stone of mass m at the end of a string of length I is whirled in a vertical circle at a constant
speed. The tension in the string will be maximum when the stone is
At the top of the circle
Quarter-way down from the top
Half-way down from the top
At the bottom ofthe circle
71. Ratio of the radii of the planets PI and P2 is k and ratio of the accelerations due to gravity on
them is s. Ratio of escape velocities from them will be
ks l If
72. Couple M is applied at C on a simply supported beam AB.
The maximum shear on AC will be
Zero
2M

3

M3
A
M 0f 8
.A A i 2m I im I "I
D3 _d3

8D2
A
Ptl 8
. I .
I P
P/2L P.c/2L
D2 _d2

P
D 2 +d2

8D
0
73. A short column of external diameter D and internal diameter is subjected to a load with
an eccentricity causing zero stress at an extreme fiber. Then the value of must be
D2 +d2

87rD
74. A beam AB is hinge-supported at its ends and is
loaded by couple P.c. as shown in the figure. The
magnitude of shearing force at a section x of the
beam is
75. There are two bars of equal length and equal volume and same material, one having stepped
diameters and other having uniform diameter. If maximum stress produced in both bars is
same, then stored energy will be
More in stepped diameter shaft
Equal in both
More in uniform diameter shaft
Depend on other factors
76. The given figure shows the shear force
diagram for the beam ABeD.
Bending moment in the portion Be of
the beam A 8
Is a non-zero constant
Varies linearly from B to C
Is zero
Varies parabolically from B to C

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MECHANICAL ENGINEERING I
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IloF'11
77. y and rxy are the rectangular stress components at a point. The radius of l-lohr's circle is


78. For the case of a slender column of length L'and flexural rigidity EI built iii at its base and free
at the top, the Eulers critical buckling load is
1[2 EI

2
Jr
2 EI
4L2
79. When a beam is subjected to a transverse shearing force, the shear stress in the upper fibers
will be
Maximum Minimum Zero Depends on other data
80. Angle made by 2i 3j 4k with the
cos-1

z-axis is S.in -l(fi49 tan-II
..
.-Jm