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Theory of Machine

Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

10
20
34
30

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Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Compound pendulum
Simple pendulum
Second's pendulum
Torsional pendulum

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

1/24
12
1/8
4/15

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Theory of Machine
A pantograph is a mechanism with

Rolling pairs
Lower pairs
Turning pairs
Higher pairs

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Theory of Machine
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

Equal to
Independent of
Directly proportional to
Inversely proportional to

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Theory of Machine
A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

Forced vibration with damping
Forced vibration without damping
Free vibration without damping
Free vibration with damping

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