Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Balanced partially
Balanced by secondary forces
Balanced completely
Not balanced

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Theory of Machine
Hammer blow

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

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