1. The stress which a material fractures under large
number of reversal of stresses is called
(a)
Endurance limit
(b) Creep
(c) Ultimate strength
(d) Residual stress
2. Hartnell governor could be classified under
the head of
(a) Inertia type governor
(b) Pendulum type governor
(c)
Centrifugal type governor
(d) Dead weight type governor
3. Sensitivity of an isochronous governor is
(a) Zero (b) One
(c) Two (d) Infinity
4. How many links would the simplest cam
mechanism have ?
(a) 1 (b) 2
(c) 3 (d) 4
5. The kinetic energy of a flywheel having
moment of
inertia ‘I’ and angular speed
‘w’ is given by
(d) None of the above
6. The flywheel of moment of Inertia 9.8 kg.m2
Fluctuates
by 30 rpm for a fluctuation in energy of
1936 joules.
The mean speed of the
flywheel, in rpm is:
(a) 600
(b) 900
(c) 968 (d) 2940
7. Which of the following is
called antifriction bearing?
(a) Slide contact bearing
(b) Collar bearing
(c)
Rolling contact bearing
(d) all of the above
8. Whenever velocity ratio required is to be
very exact
between two shafts at very small distance, and
then
it is transmitted by
(a) Belts (b) Gears
(c) Leaves (d) Chain
9. In a slider crank chain used in
reciprocating steam
engine cross-head and guides from a
(a) Turning pair (b) Sliding pair
(c) Rolling pair (d) Spherical pair
10. The gear train in which the first and last
gear have
the same axis, is called a/an
(a) Epicycle gear train
(b)
Reverted gear train
(c) Simple gear train
(d) Compound gear train
11.The point, through which the whole weight of the body acts, irrespective of its position, is known as
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12. With the increase of slenderness ratio, the
compressive
strength of the column is
(a) Increased
(b)
Decreased
(c) Unchanged
(d) May increase or decrease
| 13. |
Which of the following is a scalar quantity?
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14. When a rectangular bar of length l, breadth
b and
thickness t is subjected to an axial pull of P,
the linear
strain is given by (where E = modulus of
elasticity)
(a) btE/P (b)
bt/PE
(c) P/btE
(d) PE/bt
15. A simply supported beam of span l carries a
distributed
load that varies linearly from zero at either
of the ends, to
w kg/m at the mid-span. The shear force will be
zero at
(a) Supported ends
(b) Mid
span
(c) A distance l/4 from either end
(d) Nowhere in the entire span
16. The variation of bending moment in a
simply-supported
beam carrying a
uniformly distributed load is
(a) Linear (b) Parabolic
(c) Hyperbolic (d)
None of the above
17. During adiabatic process, essentially
(a) Entropy remains constant
(b) Enthalpy remains constant
(c) No work transfer takes place
(d) No heat
transfer takes place
18. The product of tangential force acting on a
shaft and
its radius is known as
(a) Bending moment (b) Twisting moment
(c) Torsional rigidity (d) Flexural rigidity
19. Maximum shear stress obtained from Mohr’s
circle is
(a) Equal
to the radius of the Mohr’s circle
(b) Greater than the radius of the Mohr’s circle
(c) Less than the radius of the Mohr’s circle
(d) None of the above
20. An engine receives 278 kJ/s of heat at a
fixed
temperature of 2830C and rejects heat at the
rate of
208 kJ/s to a sink maintained at 50C. The cycle
on
which the engine works may be classified as
(a) Reversible
(b) Irreversible
(c) Impossible (d) Unpredictable
21. According to Kelvin Planck statement, a
perpetual
motion machine
(a) Of first kind is possible
(b) Of first kind is impossible
(c) Of
Second kind is impossible
(d) Of Second kind is possible
22. A certain engine at full load delivers 80
kW. It requires
20 kW to rotate it without load. The mechanical
efficiency at full load condition will be
(a) 60 % (b) 70 %
(c) 80 % (d) 90 %
23.The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as
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24. In a four-stroke cycle I.C. engine, the
minimum
temperature inside the engine cylinder occurs
at the
(a)
Beginning of suction stroke
(b) End of suction stroke
(c) Beginning of exhaust stroke
(d) End of exhaust stroke
25. For testing of I.C. engine, dynamometer is
used to
find the
(a) Indicated power (b) Brake power
(c) Fuel power
(d) Friction power
26. The boiler accessory installed to recover
heat from
exhaust flue gas for feed water heating is
called
(a) Superheater (b) Economiser
(c) Air preheater (d) Reheater
27. Efficiency of diesel engine can be
increased by
(a) Decreasing the compression ratio
(b)
Decreasing the cut-off ratio
(c) Increasing the cut-off ratio
(d) Increasing the clearance volume
28. In a four-stroke cycle of an I.C. engine,
the operations
are, in sequence
(a)
Suction, compression, expansion and exhaust
(b) Suction, expansion, compression and exhaust
(c) Expansion, compression, Suction and exhaust
(d) Compression, Expansion, Suction and exhaust
29. The continuity equation
(a) Requires that newton’s second law to be valid
(b) Relates
mass rate of flow along a stream tube
(c) States that velocity at the boundary should be zero
(d) Relates rate of change of momentum
30. In an impulse reaction turbine, the
pressure drops
(a) Only in the nozzles
(b) Only in the moving blades
(c) Only in the fixed blades
(d) Both in
fixed and in moving blades
31. When starting a centrifugal pump, the
delivery valve
is kept
(a) Fully open (b) Fully closed
(c) Half open (d) Less than half open
32. Cavitation may occur in a fluid flow if
(a) Its enthalpy suddenly increases
(b) Its enthalpy suddenly decreases
(c) Its velocity suddenly reduces to zero
(d) Its
pressure reduces to the level of vapour
pressure
33. A device in which some portion of waste
heat of flue
gases is recovered to heat the air before it
passes into
the furnace for combustion purpose, is known as
(a) Superheater (b) Air preheater
(c) Reheater (d) Economiser
34. Which aspect is not valid for a fire tube
locomotive
boiler?
(a)
Externally fired (b) Horizontal
placement
(c) Multi-tubular (d)
Mobile unit
35. An ideal fluid
(a) Has no velocity
(b) Is compressive
(c) Obeys Newton’s law of velocity
(d) In both
incompressible and non-viscous
34.
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is
| a | g/2 |
| b | g/3 |
| c. | g/4 |
| d. | none of these |
37. For a body placed in water, the resultant
hydrostatic
force at its:
(a) center of gravity (b) Metacenter
(c) Center of pressure (d) Center of buoyancy
38. Flux used in brazing is
(a) Aluminium (b) Borax
(c) Zinc chloride (d) Calcium carbide
39. A Rota meter is used to measure
(a) Flow
rate of fluids
(b) Viscosity of fluids
(c) Density of fluids
(d) Rotational energy of fluids
40. In pressure welding, the
pressure required to
consummate the weld is
(a) Mechanical (b) Hydraulic
(c) Spring
(d) Air
41. Carburising heat treatment is used for
(a) Softening the metal
(b) Refining grain structure
(c)
Hardening outer surface
(d) Relieving internal stress
42. Molten steel is poured into water cooled
vertical
copper moulds is
(a) Centrifugal casting
(b)
Continuous casting
(c) Die casting
(d) Permanent mould casting
43. Cast iron steel pipes are produced by
(a) Slush casting
(b) Investment casting
(c) True
centrifugal casting
(d) Die casting
44. Weld spatter defect in welding is due to:
(a) Low voltage
(b) High voltage
(c) Too high welding current
(d) Too low
welding current
45. Tool signature comprises of
(a) 5 elements (b) 6 elements
(c) 7
elements (d) 8 elements
46. Single point thread cutting tool should
ideally have
(a) Positive rake angle (b) Negative rake angle
(c) Zero
rake angle (d) Normal rake angle
47. Investment casting uses pattern of
(a) Wax
(b) Clay
(c) Wood (d) Metal
48. The undercutting defect in welding is due
to
(a) Faulty electrode manipulation
(b) Faulty electrode usage
(c) Current
too high
(d) All of the above reasons
49. Crater wear is predominant in
(a) Carbon tool steel (b) Tungsten carbide tools
(c) H.S.S.
tools (d) Ceramic tools
50. Which of the following is not a casting defect?
(a) Scar (b)
Hot tear
(c) Hot cracking (d) Cold shut
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