Theory of Machines Quiz | Theory of Machines Objective Type Questions & Answers

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Questions
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
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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

Answer: 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

Answer: can’t occur
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

Answer: 2.44 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

Answer: leads by 90°
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

Answer: six links

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