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

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

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Theory of Machine
Hammer blow

Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies as the square root of the speed
Varies inversely with the square of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

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