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Free download in PDF Theory of Machines MCQs with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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
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°
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
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
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
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
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
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