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Theory of Machine

Theory of Machine
The lower pairs are _________ pairs.

Friction closed
Self-closed
None of these
Force-closed

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Theory of Machine
Critical damping is a function of

Mass and damping coefficient
Damping coefficient and natural frequency
Mass and stiffness
Mass and natural frequency

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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
1/8
4/15
12

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Theory of Machine
V-belts are usually used for

Short drives
Long and short drives
Long drives
None of these

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

(1/2) μ W R cosecα
(2/3) μ W R cosecα
μ W R cosecα
(3/4) μ W R cosecα

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Theory of Machine
In a shaper mechanism, the Coriolis component of acceleration will

Not exist
Exist
None of these
Depend on position of crank

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