Theory of Machine
The method of direct and reverse cranks is used in engines for

Balancing of forces and couples
Kinematic analysis
The control of speed fluctuations
Vibration analysis

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Theory of Machine
Power of a governor is the

Mean force exerted at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for a given percentage change of speed
None of these
Work-done at the sleeve for maximum equilibrium speed

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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
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism
None of the listed here

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