Theory of Machine
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Tip of both gear and pinion
Flanks of both gear and pinion
Tip of the gear tooth and flank of pinion
Tip of the pinion and flank of gear

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP