Theory of Machine
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

Both (A) and (B)
180° and 360°
0° and 90°
None of these

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Theory of Machine
In gears, interference takes place when

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
Pitch of the gears is not same
Gear teeth are undercut

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