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20th November 2014, 10:11 AM
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Re: DRDO CEPTAM Mechanical Engineering Question Papers

As you are looking for the DRDO CEPTAM Mechanical Engineering Question Papers so here I am providing you the same

1. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a mass of 1000kg. The force required on plunger is nearly equal to
a) 100N b) 1000N c) 10000N d) 1ON

Ans.
2. If the stream function is given by Ψ= 3xy, then the velocity at a point (2, 3) will be
a) 7.21 unit b) 18 unit c) 10.82 unit d) 54 unit

Ans.
3. The correct sequence of the centrifugal, pump components through which the fluid flows is
a) Impeller, Suction pipe, Foot valve and strainer, Delivery pipe
b) Foot valve and strainer, Suction pipe, Impeller, Delivery pipe
c) Impeller, Suction pipe, Delivery pipe, Foot valve and strainer
d) Suction pipe, Delivery pipe, Impeller, Foot valve and strainer

Ans.
4. The relation p = constant, where y is the ratio of the specific heats of ideal gas, is applicable to
a) Any adiabatic process b) Only reversible adiabatic process
c) Only irreversible adiabatic process d) Only isothermal process

Ans.
5. Across a normal shock
a) static pressure and the static temperature rise b) entropy remains constant
c) velocity and static pressure decrease d) density and temperature decrease

Ans.
6. A necessary precaution in selection of pumps for parallel operations is that
a) H-Q characteristics of both should be identical
b) Both pumps should be centrifugal type
c) Both pumps should be identical
d) There should not be change from positive to negative slope In H-Q curve

Ans.
7. A metallic cube of side 10 cm, density 6.8 gm/cc is floating in liquid mercury (density 13.6gm/cc), 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) 4.6 cm b) 5.4 cm c) 5.0 cm d) 5.8 cm

Ans.
8. The pressure drop for a relatively low Reynolds number flow in a 600 mm, 30 m long pipeline is 7OkPa. What is the wall shear stress?
a) 0 Pa b) 1400 Pa c) 700 Pa d) 350 Pa

Ans.

9. The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surfaces (emissivity 0.9) maintained at 400 K and 300 K is (Stefan Boltzmann constant σ = 5.67 x 10 W/m2k4)
a) 1020 b) 464 c) 812 d) 567

Ans.
10. At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. If the sonic velocity is 300 m/s, then the inlet Mach number of the flow will be
a) 0.75 b) 0.66 c) 0.90 d) 0.83

11. The transition Reynolds number for flow over a 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 1 m/s? (For water. the
kinematic viscosity, v = 0.86* 10-6 m2/s)
a) 0.43m b) 1m c)43m d)103m Ans.
12. For a reciprocating water pump having cylinder dia d and crank
radius r, if W is the weight of water lifted, the coefficient of discharge is
a) 2 b) 2 2 c) 2 d) 2 Ans. 13. Both free vortex and forced vortex can be expressed mathematically
in terms of tangential velocity V at the corresponding radius r. Choose
the correct combination
Free vortex Forced vortex
a) V r xconst. Vr= const. b)V2x r = const. V = r x const. c)V x r = const. V2= r x const. d) V x r= const. V =r x const. Ans.
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
a)Remain same b)Decrease c) Increase d) Increase/decrease depending on depth of immersion Ans.
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 of steam
will be
a) 79m/s b) 188m/s c) 450m/s d) 900m/s
Ans. 16. The critical point and triple point data for water are, Tc = 374°C, Pc =
22.1 Mpa, TT = 0.01°C. PT = 0.6 kPa Indicate the phase change that will
occur in following cases,
(i) ice at 0.5 kPa is heated isobarically
(ii) Water vapour at 400°C is compressed isothermally
a)(i)alongAB. (ii) alongCD b)(i)alongCD.(ii)along AB c) (i) alongOD.(ii) along PR d) (i) along RD.(ii)alongOR Ans.
17. The ratio of specific heats of a gas is 1.4 and the value of specific heat
at constant pressure is 7.0 cal/mole° C. The difference between specific
heat at constant pressure and specific heat at constant volume will be (in
cal/mole° C)
a) 1.4 b) 1.7 c) 5.0 d) 2.0 Ans.
18. The coefficient of linear expansion of a solid is L. The volume V of a
cube of this solid on being heated by 1° C will change by a)VL b)3VL c)3L d)VL/3
Ans. 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
a)12 √3Hz b)12 √10Hz c)12 √15Hz d)12 √2Hz Ans. 20. Ratio of pitch circle diameter in millimeters to the number of teeth, is
known as
a) Module b) Circular pitch c) Diametral pitch d) Clearance Ans.
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
a)1:8 b) 1 :√2 c) √2:1 d)1:2 Ans.
22. Which of the following stresses are associated with the tightening of
a nut on a stud?
1. Tensile stresses due to stretching of stud
2. Bending stresses of stud
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:
a) 1,2 and 3 b) 1,2and 4 c) 1,3 and 4 d) 2,3 and 4 Ans. 23. A flywheel weighs kg and has a radius of gyration of 100 cm. It is
given a spin of 100 rpm about its horizontal axis. The whole assembly is
rotating about a vertical axis at 6 rad/sec. The gyroscopic couple
experienced will be
a)2,000 kgm b) 19,620 kgm c)20,000kgm d) 1,962kgm Ans.
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
a)50mm b)6Omm c)77mm d)7Omm Ans.
25. A roller of weight W is rolled over the wooden block shown in the
given figure. The pull required just to cause the said motion is
a) W/2 b)√3W c) W d) 2 W Ans.
26. For one-dimensional isentropic flow in. a diverging passage, if the
initial static pressure is P1, and the initial Mach number is M1 (M1 <1),
then for the downstream flow
a) M2< M1; P2<p1 b)M2>M1; P2>p1 c)M2<M1; P2>p1 d)M2>M1; P2<p1 Ans.
27. In a furnace made of bricks,
Inside heat transfer coefficient 35 W/m2K
Outside heat transfer coefficient =25 W/m2K
Thermal conductivity of bricks (15 cm thick) = 0.15 W/mK
The overall heat transfer coefficient (in W/m2K) will be closer to the
a)Insideheat transfer coefficient b) Outside heat transfer coefficient c) Thermal conductivity of bricks d) Heat transfer coefficient based on the thermal conductivityof the bricks alone. Ans.
28. Two systems have the same wet bulb temperature of 200 C. System ‘A’
has Dry bulb temperature of 25°C since it has a relative humidity of 65%.
System ‘B’ has a relative humidity of 30%. What will be its dry bulb
temperature
a) 33°C b) 25°C c)27°C d) 22°C Ans.
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?
a)r=2cm&l=2m b)r=lcm&l=1m c)r=2cm&l=½m d)r=½cm&l= ½m Ans. 30. A 1000 kg vehicle travelling at 80 m/s impacts a plunger attached to
a piston-cylinder arrangement. If all of the energy of the vehicle is
absorbed by the 20 kg of liquid contained in the cylinder, what is the
maximum temperature rise of the liquid? (The specific heat of the liquid
(I is 4.0 kJ/kg.°C) a)55°C b) 40°C c)45°C d)50°C Ans. 31. In the Van der Waal’s gas equation (ƿ+ )(v – b) = RT to constant ‘a’
is introduced to compensate for
a) Reductioninspecific volume b) Inter-molecular forces c) Reduction in specific heat d) All of the above Ans.
32. The centrifugal tension in belts
a) Increase power transmission upto certain speed and then decreases b) Increases power transmission c) Does not affectpowertransmission d) Reduces power transmission
Ans. 33. In nodular iron, graphite is in the form of a) Spheroids b) Nodular carbide c) Flakes d) Cementite Ans. 34. Corrosion resistance of steel increases by addition of a) Vanadium, aluminium b) Sulpher, phosphorus, lead c) Chromium and nickel d) Tugsten, molybdenum, vanadium, chromium Ans. 35. Phenomenon of progressive extension of material with time at
constant load is called a) Plasticity b) Creep c) Yield d) Breaking Ans. 36. Rivets are made of a) Soft material b) Ductile material c) Hard material d) Brittle material Ans. 37. Addition of copper to aluminium results in a) Precipitation hardening system b) Corrosion resistance c) Grain refinement d) High machinability Ans.
38. A Hooke’s joint is used to connect two
a) Coplanar & Nonparallel shafts b) Non coplanar & Nonparallel shafts c) Coplanar & Parallelshafts d) All the 3 above Ans. 39. In a hardness test, L is load in kg, D is diameter of ball in mm and d is
diameter of indentation in mm. Brincll Hardness Number is expressed
by the equation a) BIIN = ( − 2− 2 b)BIIN = 2 ( − 2− 2
c) BIIN = ( − 2− 2 d)BIIN = 2 ( − 2− 2 Ans.

40. Circumferential anti longitudinal strains in the cylindrical boiler
under internal steam pressure arc Є1 and Є2 respectively. Change in the
volume of the boiler cylinder per unit volume will be
a) Є12Є2



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