Theory of Machines Quiz | Theory of Machines MCQs with Answers

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Questions
101 Angle of ascent of cam is defined as the angle
A during which the follower returns to its initial position
B of rotation of the cam for a definite displacement of the follower
C through which the cam rotates during the period in which the follower remains in highest position
D moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Answer: moved by the cam from the instant the follower begins to rise, till it reaches its highest position
102 Angle of dwell of cam is defined as the angle
A during which the follower returns to its initial position
B of rotation of the cam for definite dis¬placement of the follower
C through which the cam rotates during the period in which the follower remains in the highest position
D moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Answer: through which the cam rotates during the period in which the follower remains in the highest position
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103 Angle of action of cam is defined as the angle
A during which the follower returns to its initial position
B of rotation of the cam for a definite displacement of the follower
C through which the cam rotates during the period in which the follower remains in the highest position
D moved by the cam from beginning of ascent to the termination of descent.

Answer: moved by the cam from beginning of ascent to the termination of descent.
104 Angle of descent of cam is defined as the angle
A during which the follower returns to its initial position
B of rotation of the cam for a definite displacement of the follower
C through which the cam rotates during the period in which the follower remains in the highest position
D moved by the cam from beginning of ascent to the termination of descent.

Answer: during which the follower returns to its initial position
105 Cam angle is defined as the angle
A during which the follower returns to its initial position
B of rotation of the cam for a definite displacement of the follower
C moved by the cam from the instant the follower begins to rise, till it reaches its highest position
D moved by the can from beginning of i ascent to the termination of descent.

Answer: of rotation of the cam for a definite displacement of the follower
106 For the same lift and same angle of ascent, a smaller base circle will give
A a small value of pressure angle
B a large value of pressure angle
C there is no such relation with pressure angle
D something else

Answer: a large value of pressure angle
107 The maximum value of the pressure angle in case of cam is kept as
A 10°
B 14°
C 20°
D 30°

Answer: Idling
108 Cylindrical cams can be classified as
A circular
B tangent
C reciprocating
D none of the above.

Answer: none of the above.
109 Cam size depends upon
A base circle
B pitch circle
C prime circle
D outer circle

Answer: base circle
110 The pressure angle of a cam depends upon
A offset between centre lines of cam and follower
B lift of follower
C angle of ascent
D all of the above

Answer: all of the above
111 A circle passing through the pitch point with its center at the center of cam axis is known as
A pitch circle
B base circle
C prime circle
D outer circle

Answer: prime circle
112 Klein’s construction is useful to determine
A velocity of various parts
B acceleration of various parts
C displacement of various parts
D angular acceleration of various parts

Answer: acceleration of various parts
113 Klein’s construction can be used when
A crank has a uniform angular velocity
B crank has non-uniform velocity
C crank has uniform angular acceleration
D crank has uniform angular velocity and angular acceleration

Answer: crank has a uniform angular velocity
114 The sense of Corioli’s component is such that it
A leads the sliding velocity vector by 90°
B lags the sliding velocity vector by 90°
C is along the sliding velocity vector
D leads the sliding velocity vector by 180°

Answer: leads the sliding velocity vector by 90°
115 Corioli’s component acts
A perpendicular to sliding surfaces
B along sliding surfaces
C somewhere in between above two
D unpredictable

Answer: perpendicular to sliding surfaces
116 The number of centers in a crank driven slider crank mechanism are
A 0
B 2
C 4
D 6

Answer: 2
117 Klein’s construction can be used to determine acceleration of various parts when the crank is at
A inner dead centre
B outer dead centre
C right angles to the link of the stroke
D all of the above

Answer: all of the above
118 Corioli’s component is encountered in
A quick return mechanism of shaper
B four bar chain mechanism
C slider crank mechanism
D all of the above

Answer: quick return mechanism of shaper
119 The magnitude of tangential acceleration is equal to
A velocity2 x crank radius
B velocityvcrankradius
C (velocity/crankradius)
D velocity x crank radius2

Answer: velocityvcrankradius
120 In a shaper mechanism, the Corioli’s component of acceleration will
A not exist
B exist
C depend on position of crank
D unpredictable

Answer: exist

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