SSC JE, RRB JE, DMRC, GATE.
MECHANICAL ENGINEERING
THEORY OF MACHINES (TOM)
500+
QUESTION SERIES Part-2
IMPORTANT MCQ QUESTIONS WITH ANSWERS | REPEATED IN ALL EXAMS.
Q.51. The maximum or minimum value of the swaying couple is?
a. ± c.m.ω2.r
b. ± a(1 - c)m.ω2.r
c. ± a (1 - c)m.ω2.r
2
d. ± 2a(1 - c)m.ω2.r
Q.52. For an involute gear, the ratio of base circle radius and pitch circle
radius is equal to?
a. sin φ
b. cos φ
c. sec φ
d. cosec φ
Q.53. Which of the following is an open pair?
a. Ball and socket joint
b. Journal bearing
c. Lead screw and nut
d. Cam and follower
Q.54. The frictional torque transmitted in a flat pivot bearing with
assumption of uniform pressure is _____ as compared to uniform
wear.?
a. less
b. more
c. same
d. none
Q.55. A chain consisting of four links and four joints is called a kinematic
chain.?
a. Yes
b. No
Q.56. A reed type tachometer use the principle of?
a. longitudinal vibration
b. torsional vibration
c. transverse vibration
d. damped free vibration
Q.57. When the sleeve of a Porter governor moves upwards, the governor
speed?
a. increases
b. decreases
c. remains unaffected
d. first increases and then decreases
Q.58. The retardation of a flat faced follower when it has contact at the
apex of the nose of a circular arc cam, is given by (where OQ =
Distance between the centre of circular flank and centre of nose)?
a. ω2 x OQ
b. ω2 x OQ sin θ
c. ω2 x OQ cos θ
d. ω2 x OQ tan θ
Q.59. A thin circular disc is rolling with a uniform linear speed, along a
straight path on a plane surface. Which of the following statement is
correct in this regard ??
a. All points of the disc have the same velocity
b. The centre of the disc has zero acceleration
c. The centre of the disc has centrifugal acceleration
d. The point on the disc making contact with the plane surface has zero
acceleration
Q.60. The natural frequency of free transverse vibrations due to a point load
acting over a simply supported shaft is equal to (where δ = Static
deflection of a simply supported shaft due to the point load)?
a. b.
c. d.
Q.61. Which of the following statement is correct ?
a. The periodic time of a particle moving with simple harmonic motion is
the time taken by a particle for one complete oscillation.
b. The periodic time of a particle moving with simple harmonic motion is
directly proportional to its angular velocity.
c. The velocity of a particle moving with simple harmonic motion is zero at
the mean position.
d. None
Q.62. When the speed of the engine fluctuates continuously above and
below the mean speed, the governor is said to be?
a. stable.
b. unstable.
c. isochronous.
d. hunt
Q.63. When two pulleys of different diameters are connected by means of
an open belt, the angle of contact at the __________ pulley must be
taken into consideration?
a. smaller
b. larger
c. Equal to.
d. None
Q.64. The maximum frictional force, which comes into play, when an body
just begins to slide over the surface of the other body, is known as?
a. static friction
b. dynamic friction
c. limiting friction
d. coefficient of friction
Q.65. In a four stroke I.C. engine, the turning moment during the
compression stroke is?
a. positive throughout
b. negative throughout
c. positive during major portion of the stroke
d. negative during major portion of the stroke
Q.66. A body will begin to move down an inclined plane, if the angle of
inclination of the plane is______ the angle of friction.?
a. equal to
b. less than
c. greater than
d. none
Q.67. The fundamental equation for correct steering is (where φ and α =
Angle through which the axis of the outer wheel and inner wheel
turns respectively, c = Distance between the pivots of the front axles,
and d = Wheel base)?
a. sin φ + sin α = b/c
b. cos φ - sin α = c/b
c. cot φ - cot α = c/b
d. tan φ + cot α = b/c
Q.68. The height of a Watt's governor is?
a. directly proportional to speed
b. directly proportional to (speed)2
c. inversely proportional to speed
d. inversely proportional to (speed)2
Q.69. A rotor supported at A and B carries two masses as shown in the
below figure. The rotor is?
a. dynamically balanced
b. statically balanced
c. statically and dynamically balanced
d. not balanced
Q.70. For an isochronous Hartnell governor (where r1 and r2 = Maximum
and minimum radius of rotation of balls respectively, S1 and S2 =
Maximum and minimum force exerted on the sleeve respectively,
and M = Mass on the sleeve)?
a. b.
c. d
Q.71. Which of the following is a higher pair?
a. Belt and pulley b. Turning pair
c. Screw pair d. Sliding pair
Q.72. When the belt is stationary, it is subjected to some tension known as
initial tension. The value of this tension is equal to the?
a. tension in the tight side of the belt
b. tension in the slack side of the belt
c. sum of the tensions on the tight side and slack side of the belt
d. average tension of the tight side and slack side of the belt
Q.73. In a force-closed pair, the two elements of a pair are not held together
mechanically.?
a. Agree
b. Disagree
c. None
)
Q.74. Maximum fluctuation of energy in a flywheel is equal to (where I =
Mass moment of inertia of the flywheel, E = Maximum fluctuation of
energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular
speed = ?
a. Iω(ω1 - ω2)
b. Iω2CS
c. 2ECS
d. All of these
)
Q.75. The coriolis component of acceleration acts?
a. along the sliding surface
b. perpendicular to the sliding surface
c. at 45° to the sliding surface
d. parallel to the sliding surface
)
Q.76. The module is the reciprocal of diametral pitch?
a. True
b. False
)
Q.77. If the controlling force line for a spring controlled governor when
produced intersects the Y-axis at the origin, then the governor is said
to be?
a. stable
b. Unstable
c. Isochronous
d. none of these
)
Q.78. In a reciprocating steam engine, when the crank has turned from
inner dead centre through an angle θ, the angular acceleration of the
connecting rod is given by?
a. b.
c. d.
Q.79. If the controlling force line for a spring controlled governor when
produced intersects the Y-axis above the origin, then the governor is
said to be unstable?
a. Right b. Wrong
)
Q.80. The product of the diametral pitch and module is equal to one.?
a. Correct b. Incorrect
)
Q.81. The inversion of a mechanism is?
a. changing of a higher pair to a lower pair
b. turning its upside down
c. obtained by fixing different links in a kinematic chain
d. obtained by reversing the input and output motion
Q.82. The coefficient of fluctuation of energy is the ratio of maximum
energy to the minimum energy.?
a. True
b. False
Q.83. When the nature of contact between the elements of a pair is such
that it can only slide relative to the other, the pair is known as a?
a. screw pair
b. spherical pair
c. turning pair
d. sliding pair
Q.84. The velocity of a particle moving with simple harmonic motion, at any
instant is given by (where ω = Displacement of the particle from mean
position)?
a.
b.
c.
d.
Q.85. The velocity of piston in a reciprocating steam engine is given by
(where ω = Angular velocity of crank, r = Radius of crank pin circle, θ
= Angle turned by crank from inner dead centre, and n = Ratio of
length of connecting rod to the radius of crank)?
a. b.
c. d.
Q.86. The primary unbalanced force is maximum _______ in one revolution
of the crank.?
a. twice b. four times
c. eight times d. sixteen times
Q.87. The instantaneous centres which vary with the configuration of
mechanism, are called?
a. permanent instantaneous centres
b. fixed instantaneous centres
c. neither fixed nor permanent instantaneous centres
d. none of the above
Q.88. The displacement of the reciprocating roller follower, when it has
contact with the straight flanks of the tangent cam, is given by
(where r1 = Minimum radius of the cam, r2 = Radius of the roller
follower, and θ = Angle turned by the cam from the beginning of the
follower displacement)?
a. (r1 - r2)(1 - cosθ)
b. (r1 + r2)(1 + cos θ)
c. (r1 - r2) (1 – cosθ/ cos θ)
d. (r1 + r2) (1 – cosθ/ cos θ)
Q.89. In considering friction of a V-thread, the virtual coefficient of friction
(μ1) is given by?
a. μ1 = μ sin β
b. μ1 = μ cos β
c. μ1 = μ / sin β
d. μ1 = μ / cos β
Q.90. The wear of bearing is proportional to velocity and pressure.?
a. yes
b. no
Q.91. In a shaper mechanism, the coriolis component of acceleration does
not exist?
a. True
b. False
Q.92. In a gear having involute teeth, the normal to the involute is a tangent
to the?
a. pitch circle
b. base circle
c. addendum circle
d. dedendum circle
Q.93. A body is said to be under forced vibrations, when?
a. there is a reduction in amplitude after every cycle of vibration
b. no external force acts on a body, after giving it an initial displacement
c. a body vibrates under the influence of external force
d. none of the above
Q.94. The natural frequency of free longitudinal vibrations is equal to
(where m = Mass of the body, s = Stiffness of the body, and δ = Static
deflection of the body)?
a. b.
c. d. any one of these
Q.95. The radius of a friction circle for a shaft rotating inside a bearing is
(where r = Radius of shaft, and tan φ = Coefficient of friction between
the shaft and bearing)?
a. r sin φ b. r cos φ
c. r tan φ d. (r/2) cos φ
Q.96. The maximum and minimum value of the tractive force is given by?
a. ± c.m x ω2.r b. ± 2 x c.m.ω2.r
c. ± 2(1 - c)m x ω2.r d. ± 2 x c.m x ω2.r
Q.97. In a turning moment diagram, the variations of energy above and
below the mean resisting torque line is called?
a. fluctuation of energy
b. maximum fluctuation of energy
c. coefficient of fluctuation of energy
d. none of these
Q.98. In a spring controlled governor, when the controlling force ______ as
the radius of rotation increases, it is said to be a stable governor?
a. remains constant
b. decreases
c. increases
d. none
Q.99. The distance between the centre of suspension and centre of
percussion is equal to the equivalent length of a simple pendulum.?
a. Agree
b. Disagree
Q.100. When the body is suspended at the point of suspension, its periodic
time and frequency will be __________ as compared to the body
suspended at the point of percussion.?
a. same
b. two times
c. Four times
d. none
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