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Theory of Machine

Theory of Machine
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

sinφ
cosecφ
cosφ
secφ

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Theory of Machine
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

M/(m + M)
(m + M)/M
(m + M)/m
m/(m + M)

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Theory of Machine
In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

Will not occur
Will remain same
Could change or remain unaltered depending on which link is fixed
Will change

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Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

Perpendicular to AB
Parallel to AB
Along AB
At 45° to AB

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Theory of Machine
In a radial cam, the follower moves

In any direction irrespective of the cam axis
Along the cam axis
In a direction perpendicular to the cam axis
In a direction parallel to the cam axis

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Theory of Machine
A pulley and belt in a belt drive form a

Rolling pair
Cylindrical pair
Sliding pair
Turning pair

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