1. A hydraulic press has a ram of 15 em diameter and plunger of 1.5 em. It is required to lift a mass of 1000kg. The force required on plunger is nearly equal to
lOON b) IOOON IOOOON ION
2. If the stream function is given by 3xy, then the velocity at a point will be
7.21 unit 18 unit 10.82 unit 54 unit
3. The correct sequence of the centrifugal pump components through which the fluid
flows is
Impeller, Suction pipe, Foot valve and strainer, Delivery pipe
Foot valve and strainer, Suction pipe, Impeller, Delivery pipe
Impeller, Suction pipe, Delivery pipe, Foot valve and strainer
Suction pipe, Delivery pipe, Impeller, F60t valve and strainer

4. The relation pV constant, where y is the ratio of the specific of ideal gas, is applicable to
Any adiabatic process Only reversible adiabatic process
Only irreversible adiabatic process Only isothermal process

5. Across a normal shock
static pressure and the static temperature rise entropy remains constant velocity and static pressure decrease density and temperature decrease
6. A necessary precaution in selection of pumps for parallel operations is that H-Q characteristics of both should be identical Both pumps should be centrifugal type
Both pumps should be identical
There should not be change from positive to negative slope in H-Q curve

7. A metallic cube of side 10 cm, density 6.8 gm/cc is floating in liquid mercury (density
13. with 5 cm height of cube exposed above the mercury level. Water (density 1 gm/cc) is filled over this, to submerge the cube fully. The new height of cube exposed above mercury level is
a)4.6em b)5.4 em c)5.0 em d)5.8 em
8. The pressure drop for a relatively low Reynolds number flow in a 600 mm, 30 m long pipeline is 70kPa. What is the wall shear stress?
a)0Pa b)1400 Pa c)700Pa d)350 Pa


INDIAN SPACE RESEARCH ORGANISATION Page: 2 OF 11

9. The radiative heat transfer rate per unit area between two plane parallel grey surfaces (emissivity 0.9) maintained at 400 K and 300 K is (Stefan Hottzman constant 5.67 xl 0 HI 11/1 2 K-l
1020 464 812 d) 567
10. At the eye tip of a centrifugal impeller, blade velocity is 200 mls while the uniform axial velocity the inlet is 150 m/s. If the sonic velocity is 300 mis, then the inlet Mach number of the flow will be
0.75 h) 0.66 0.90 0.83
II. The transition Reynolds number for flow over flat plate is 5*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 =0.86* 10.6 m
0.43 m 1 m c)43m d)103 m
12. For a reciprocating water pump having cylinder dia d and crank radius if HI isthe
. weight ofwater lifted, the coefficient of discharge is
. HI

2H1

ml-r . y71d 2r

13. Both free vortex and forced vortex can be expressed mathematically in terms of tangential velocity Vat the corresponding radius r. Choose the correct combinatio.n
Free vortex Forced vortex
Y X const. const.
y 2 X const. V X const.
y x const. V2 X const.
Vx I'=const. V X const.

14. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
Remain same Decrease Increase Increaseldecrease depending on depth ofimmersion
15; A single-stage impulse turbine with a diameter of 120 cm runs at 3000 rpm. If the blade speed ratio is 0.42, then, the inlet velocity Qf steam will be 79 m/s 188 m/s 450 m/s 900 m/s

"16. The critical point and triple point data for water are, Critical point ........... D
Tc Pc 22.1 Mpa, T r 0.0 PT 0.6 kPa
22,
QJ;
Indicate the phase change that will occur in following
Triple cases, en f pomt
I
0..
0.5 kPa is heated isobarically 06 R

Water vapour at 400°C is compressed isothermally
o 001°C 374'C
Temperature
along along CD along CD, along AB
along OD, along PR along RD, along OR

17.
The ratio of sp<.--cific heats ofa gas is 1.4 and the value of sp<.--cific at constant pressure is 7.0 wi/mole 0 C. The difference between specific heat at constant pressure and specific heat at constant volume will be (in call moleuC)

1.4 1.7 c)5.0 d) 2.0

18.
The coefficien't of linear expansion of a solid is L. The volume V of a cube of this solid on being heated by 10 C will change by


VL
VL b) 3VL 3L


19. Two springs of equal length but having stiffness of 10 N/mm and 15 N/mm support a
mass of 2 tonnes in series. Find the frequency of vibration

-113Hz JIO Hz Jl5Hz J2Hz
2TC 2TC 2TC 2TC
20.
Ratio of pitch circle'diameter in millimeters to the number of teeth, is known as

Module Circular pitch Diametral pitch Clearance

21.
Two particles with masses in the ratio 1:4 are moving with equal kinetic energies. The magnitude of their linear momentums will conform to the ratio

J2 J2: 1 1:2

22.
Which of the following stresses are associated with the tightening of a nut on a stud?

1.
Tensile stresses due to stretching ofstud

2.
Bending stresses ofstud

3.
Transverse shear stresses across threads


4. Torsional shear stresses in threads due to frictional resistance
Select the correct answer using the codes given below:


23.
A flywheel weighs 981 kg and has a radius of!''Yration of tOO cm. It is given a spin of


a)1,2and3 b)1,2and4 c)1,3and4 d)2,3and4


IT
100 rpm about its axis. The whole is rotating about a vertical axis at 6 rad/sec. The gyroscopic couple experienced will be
2,000 kgm 19,620 kgm 20,000 kgm 1,962 kgm
24.
Determine the diameter of solid shaft which will transmit 90kw at 160 rpm, if the

shear stress in the shaft is limited to 60 N/mm2
50 mm b)60mm 77 mm .d) 70 mm


25.
A roller of weight W is rolled over the wooden block shown in the given figure. The pull requircd just to cause thc said motion is


W/2 .J3W W d)2W
26. For one-dimensional iscntropic flow in a diverging passage, ifthe initial static pressurc
is Ph and thc initial Mach number is thcn for the downstream flow M2< P2< PI M2> M I P2> PI M2 I P2> PI M2> Mj P2< PI
27. In a furnace made of bricks, Inside heat transfer coefficient =35 W/m2K Outside heat transfer coefficient =25 W/m2K
. Thermal conductivity ofbricks (15 cm thick) 0.15 W/mK
The overall heat transfer coefficient (in W/m2K) will be closer to the

Inside heat transfer coefficient Outside heat transfer coefficient Thermal conductivity ofbricks Heat transfer coefficient based on the thermal conductivity ofthe bricks alone.
28. Twosystemshavethesamewetbulbtemperatureof20°C. System'A'hasDrybulb temperature of25°C since it has a relative humidity of65%. System has a relative humidity of30%. What will be its dry bulb temperature
33°C 25°C 27°C d) 22°C
29. Four rods with different radii r and length l are connected to two reservoirs at different temperature. Which one of them will conduct most heat?
1 11
r 2cm l 2m r =lcm l =1m r =2cm
2 22



30. A 1000 kg vehicle iravelling at 80 mls impacts a plunger attached to a piston-cylinder arrangement. Ifall of the energy of the vehicle is absorbed by the 20 kg of liquid contained in the cylinder, what is the maximum tempenlture rise of the liquid'! (The specific heat of the liquid is 4.0 kJ/kg.oC)
5SIJC 40°C 4SoC d) 50°C
31.
Inter-molecular f()rces All of the above
32.
The centrifugal tension in belts Increase power transmission upto certain speed and then decreases Increases power transmission

Docs not affect power transmission
Reduces power transmission


33.
In nodular iron, graphite is in the form of Spheroids Nodular carbide Flakes Cementite

34.
Corrosion resistance of steel increases by addition of


Vanadium, aluminium Sulpher, phosphorus, lead Chromium and nickel Tugsten, molybdenum, vanadium, chromium
35.
Phenomenon of progressive extension of material with time at constant load is called Plasticity Creep Yield Breaking

36.
Rivets are made of Soft material Ductile material Hard material Brittle material

37.
Addition of copper to aluminium results in


Precipitation hardening system Corrosion resistance
Grain refinement High machinability

38. A Hooke's joint is used to connect two
Coplanar Nonparallel shafts Non coplanar Nonparallel shafts Coplanar Parallel shafts All the 3 above
Mechanical SET-A


Page:

INDIAN SPACE RESEARCH ORGANISATION

6 OF 11
--2009 MECHANICAL ENGINEERING -SET· A
39. In a hardness test, L is load in kg, is diameter of ball in mm and d is diameter of indentation in mm. Brinell Hardness Number is expressed by the e(luation
1. 21.
BIIN BIIN
nD(D f)2 _d2 f)2

. 1.
BIIN BIIN 21.


40.
Circumferential longitudimll strains in the cylindrical boiler under internal steam pressure are 1 and £2 rcspectively. Change in thc volume of the boilcr cylinder pcr unit volume will be

41.
An overhung beam ABC of length 4m is supported at Aand B 3m apart. It is loaded with VDL of 5 along its entire length. Find the value of load at C such that the reactions at A and B are equal and opposite.




P=IO kN P=30 kN P=20 kN P=25 kN
42. Iftwo gears have moment of inertias as II and 12 respectively and mesh with a speed ratio OJ2 OJI then equivalent moment of inertia of both gears referred to first" one
""
is

nIl +12

43. A uniform circular ring of mass M and radius r is rotating with an angular speed OJ about an axis passing through its center and perpendicular to the plane of the ring. Two identical beads, each of mass somehow get attached at two diametrically opposite points. The rotational speed of the ring will become
OJM OJM 20JM
OJ
M+2m M+m M+2m
44. An electric lift is moving downward with an acceleration of g/3. the vertical force .between a passenger in the lift and its floor is equal to
3/4 ofthe passenger's weight 2/3ofthe passenger's weight Passenger's weight 4/3ofthe passenger's weight
INDIAN SPACE RESEARCH ORGANISATION Page: 7 OF 11

45.
A body of mass 10kg moving with a velocity of 1 m/s is acted upon by a force of50 N for two seconds. The final velocity of the body is

22m/sec 1m/sec .J2j m/sec 11m/sec

46.
. Proof resilience may be defined as


Max. strain energy that can be stored Work done in straining the material
in a material per unit volume Max. strain energy that can be stored in a Max. load which can be applied to a material under c1a<;tic condition .. member
47. A plane intersects the co-ordinate axes atx= 1/2. What is the Miller
index of this plane'?
d)
48. Relationship between modulus of elasticity modulus of rigidity G and Poisson's ratio j.l is
G=E E=G
49. A bar of Length area A and Young's modulus E is subjected to a pulling force P. The strain energy stored in the bar is
2 2 L 2
.p
PL2 PL d) p L

2AE
AE 2El AE
50. What is the expression for crippling load for a column of length with one end fixed . and other end free?
P =Jr2 El/4L2 P Jr2 El/L2 P =2Jr2 El/L

51. A Mohr's circle reduces to a point when the body is subjected to
Pure shear Uniaxial stress only Equal opposite axial stresses on two mutually perpendicular planes, the planes being
free ofshear. Equal axial stresses are on two mutually perpendicular planes, the planes being free of shear.
52. Power screws are used to convert
Linear motion to None ofthese Botha& b Rotary motion into rotary motion translatory motion




-.. INDIAN SPACE RESEARCH ORGANISATION Page: 8 OF 11

53. Following gases are used in tungsten inert gas welding
a)CO2and 112 b)Argonandneon c)Argonandhelium d))Heliumandneon
54. The force required to punch 25 mm hole in a mild steel plate 10 mm thick, when ultimate shcar stress of the platc is 500 N/mm 2 will be nearly
78kN 393kN 98kN d) 158kN
55. One-half length of 50mm diameter steel rod is solid while the remaining half is hollow having a bore of 5 mm. The rod is subjected to equal and opposite torque at its ends. If the maximum shear stress in solid portion is the maximum shear stress in the hollow portion is:
15 4
a.) -r r
16 3 15

56. Two metal phltes of thickness width joined by a fillet weld of 45° as shown in fig. When subjected to a pulling force the stress induced in the weld will be

F FF.Sin45
2F

wt 'wtSin45 wt wt
57. Ring rolling is used
To decrease the thickness and increase diameter To increase the thickness of a ring For producing a seamless tube For producing large cylinder
58.
A bar of 20mm dia is tested in tension. It is observed that when a load of 38KN is applied the extension measured over a gauge length of200mm is O.12mm and contraction in diameter is 0.0036mm. Find the Poisson's ratio

59.
A perfect frame has N joints. The number of members should not be less than


0.2 b) 0.3 0.25 0.33
2N-1 b) 2N-2 2N-3 2N-5
60. A cantilever beam of rectangular cross section is subjected to load at free end. Ifthe depth of the beam is doubled and load is halved, deflection of the free end as compared to original will be
c)2 d)1/16




61. The kinematic planar chain shown in

the given figure is a
I I
Structure Mcchanism with 2 dcgrcc offrccdom Mechanism with I dcgrcc of fi'ccdom Mechanism with morc than 2 degrcc of freedom
62. The machining process in which the work piece is dissolved into electrolyte solution is called
Electro-chemical machining Ultrasonic machining
Electro-discharge machining Laser machining

63. In the metal forming process, the stresses encountered are
Greater than yield strength but less than ultimate strenbrth
Less than yield strength of the material
Greater than the ultimate strength of the material
Less than the elastic limit
64. A grinding wheel is specified as 49 A 26 36 M 7 V 24. The number 36 stands for
Structure Grade Grit size Bond
65. In a fluid machinery, the relationship between saturation temperature and pressure decides the process of
Flow separation Cavitation Turbulent mixing Water hammer
66. Anodising is
A process ofcoating ofzinc by hot dipping A zinc diffusion process A process used for making thin phosphate An oxidizing process used for aluminium coatings on steel to act as a base or primer and magnesium articles for enamels and paints
67. The process layout is best suited where
Automation is employed Mass production is envisaged A few number ofnon-standardized units Machines are arranged according to are to be produced sequence ofoperation
Mechanical


68. The blank size of the gear of3 mm module and 40 number of teeth is
a) 120mm b)123mm c)126mm d)129mm
69. 7 white, red and 9 hlack balls. Two balls are drawn at random. The
probability that both the halls will be black is
I 12 59


II7777 77

70. Match list (Machining Process) with, list -II (Associated medium) and select the correct answer using the codes given below the lists
List (Machining Process) List -II (Associated Medium) Ultrasonic machining Kerosene EDM Abrasive slurry ECM Vacuum EBM Salt solutioll
A B C D
..,
a)2 1 4

...,
b)2
...,

c)4
4 2
71. The rake angle of a cutting tool is shear angle 45° and cutting velocity 35 m/min. What is the velocity of chip along the tool face?
25.3 m/min 27.3 m/min 28.5 m/min 23.5 m/min
72. The value of the determinant given below is
1
l+a 1
1 I-b
11 l+c
-abc abc 1 d) 0
73. The locus of the point Z satisfying the condition arg Z TC is
Z+1 3
x2 y2
x 2+y2 -2.J3y


74. In a simple micrometer with screw pitch 0.5 mm and divisions on thimble 50, the
reading corresponding to 5 divisions on barrel and 12 divisions on thimble is 2.620 mm 2.512 mm 5.120 mm 5.012 mm
75. ltis required to cut screw threads of2mm pitch on a lathe. The lead screw has a pitch
-of 6 mm. Ifthe spindle speed is 60 rpm, then the speed of the lead screw will be 10 rpm 20 rpm 120 rpm 180rpm
76. If 1 ...., au. 2 au.
u=.og(tanx+tany ,tlen +S1I1 y-IS
ax ay
1 2 d)
77. The value of for which the equations 2/L.x -3y 3x -2y 0 and 4x 2 0 arc consistent is
3 or 6 b)1or3 c)2or6 d)2or3


78.
If and PI P;I =5. Ie] the angle between ci and h is

79.
The image of the point in the plane 2x z is 2

80.
Find a particular integral of the differential equation 2 -4D+3)y=sin3xcos2x



_1(IOcos5x -11sin5x)+_1_(sinx-2cosx)
20 884

_1_(IOcos5x-llsin5x)+_1(sinx+2cosx)
884 20

_1(10cos5x-llsin5x)+_1_(sinx+ 2cosx)
884

_1_(lOcos5x+11sin5x)+_1(sin x 2cosx)
884 20

Mechanical

m