Theory of Machine
Pitch point on a cam is

Any point on pitch curve
Any point on pitch circle
The point on cam pitch curve having the maximum pressure angle
The point on cam pitch curve having the minimum pressure angle

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Both (A) and (B)
The Ackerman steering gear consists of turning pairs
The Ackerman steering gear is most economical
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

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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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