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Free download in PDF Theory of Machines Objective Type Questions & 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.
121
The direction of Corioli’s component of acceleration is the direction
[A]
of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
[B]
along perpendicular to angular velocity
[C]
along the centripetal acceleration
[D]
none of the above
Answer: of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
122
Corioli’s component of acceleration exists whenever a point moves along a path that has
[A]
rotational motion
[B]
tangential acceleration
[C]
linear displacement
[D]
none of the above
Answer: rotational motion
123
Angular acceleration of a link can be determined by dividing the
[A]
centripetal component of acceleration with length of link
[B]
tangential component of acceleration with length of link
[C]
resultant acceleration with length of link
[D]
none of the above
Answer: tangential component of acceleration with length of link
124
The absolute acceleration of any point P in a link about center of rotation 0 is
[A]
at 45° to PO
[B]
along PO
[C]
perpendicular to PO
[D]
none of the above
Answer: none of the above
125
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line
[A]
not possible to determine with these data
[B]
joining the corresponding points
[C]
perpendicular to line as per (a)
[D]
none of the above
Answer: joining the corresponding points
126
Two systems shall be dynamically equivalent when
[A]
M.I. of two about an axis through e.g. is equal
[B]
the mass of two are same
[C]
e.g. of two coincides
[D]
all of the above
127
Instantaneous center of rotation of a link in a four bar mechanism lies on
[A]
right side pivot of this link
[B]
lift side pivot of this link
[C]
can’t occur
[D]
none of the above
128
The Bifilar suspension method is used to determine
[A]
natural frequency of vibration
[B]
position of balancing weights
[C]
moment of inertia
[D]
angular acceleration of a body
Answer: moment of inertia
129
The frequency of oscillation at compared to earth will be
[A]
2.44 times,less
[B]
2.44 times more
[C]
6 times more
[D]
6 times less
130
Inertia force acts
[A]
perpendicular to the accel< force
[B]
along the direction of accel* force
[C]
opposite to the direction of ace ing force
[D]
in any direction w.r.t. accel* force depending on the magnit two
Answer: opposite to the direction of ace ing force
131
In S.H.M., the velocity vector w.r.t. displacement vector
[A]
leads by 90°
[B]
lags by 90°
[C]
leads by 180°
[D]
are in phase
132
For simple harmonic motion of the of follower, a cosine curve represents
[A]
acceleration diagram
[B]
velocity diagram
[C]
displacement diagram
[D]
all of the above
Answer: acceleration diagram
133
In above example, the minimum length of the coupler will be
[A]
45 mm
[B]
slightly less than 45 mm
[C]
slightly more than 45 mm
[D]
none of the above
Answer: slightly more than 45 mm
134
Kinematic pairs are those which have
[A]
two elements having relative motion
[B]
two elements held together mechani-cally
[C]
two elements having Coroili’s com-ponent
[D]
minimum of two instantaneous centres
Answer: two elements having relative motion
135
In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
[A]
equal to sum of other two
[B]
greater than sum of other two
[C]
less than sum of other two
[D]
none of the above
Answer: less than sum of other two
136
A kinematic chain requires at least
[A]
4 links and 4 turning pairs
[B]
3 links and 4 turning pairs
[C]
2 links and 3 turning pairs
[D]
none of the above.
Answer: 4 links and 4 turning pairs
137
Which of the following mechanisms produces mathematically an exact straight line motion
[A]
Peaucellier’s mechanism
[B]
Watt mechanism
[C]
Grasshopper mechanism
[D]
All of the above
Answer: Peaucellier’s mechanism
138
Whitworth quick return mechanism is obtained by inversion of
[A]
slider crank mechanism
[B]
kinematic chain
[C]
five link mechanism
[D]
none of the above
Answer: slider crank mechanism
139
For a kinematic chain to be considered as mechanism
[A]
two links should be fixed
[B]
one link should be fixed
[C]
there is no such criterion
[D]
none of the links should be fixed
Answer: one link should be fixed
140
Hart mechanism has
[A]
six links
[B]
twelve links
[C]
eight links
[D]
four links
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