Theory of Machine
A spring controlled governor is said to be isochronous when the controlling force

Decreases as the radius of rotation increases
Increases as the radius of rotation increases
Increases as the radius of rotation decreases
Remain constant for all radii of rotation

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
Both (A) and (B)
None of these
The algebraic sum of the primary forces must be equal to zero

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Theory of Machine
Open pairs are those which have

Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion

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