Theory of Machine
For the same lift and same angle of ascent, a smaller base circle will give

A small value of pressure angle
Something else
A large value of pressure angle
There is no such relation with pressure angle

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

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

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