Theory of Machine
The unbalanced force due to reciprocating masses

Varies in magnitude but constant in direction
Varies in magnitude and direction both
Varies in direction but constant in magnitude
Constant in magnitude and direction both

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Vary with the configuration of the mechanism
None of the listed here
Remain in the same place for all configurations of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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Theory of Machine
In gears, interference takes place when

Gear teeth are undercut
Pitch of the gears is not same
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gears do not move smoothly in the absence of lubrication

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