Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Balanced by secondary forces
Balanced completely
Not balanced
Balanced partially

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Theory of Machine
In gears, interference takes place when

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

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