Exercise: Theory Of Machines

Questions for: Theory Of Machines

The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.
A:
zero
B:
minimum
C:
maximum
D:
Answer: B
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In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T1 acts at A and smaller tension T2 at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should
A:
be zero
B:
act in upward direction
C:
act in downward direction
D:
none of the above
Answer: C
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The direction of linear velocity of any point on a link with respect to another point on the same link is
A:
parallel to the link joining the points
B:
perpendicular to the link joining the points
C:
at 45° to the link joining the points
D:
none of the above
Answer: B
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When two links are connected by a pin joint, their instantaneous centre lies
A:
on their point of contact
B:
at the centre of curvature
C:
at the centre of circle
D:
at the pin joint
Answer: D
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The periodic time is given by (where ω = Angular velocity of the particle in rad/s)
A:
ω/2π
B:
2π/ω
C:
ω x 2π
D:
π/ω
Answer: B
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