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

Balanced completely
Balanced by secondary forces
Not balanced
Balanced partially

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Theory of Machine
A governor is said to be stable, if the

Radius of rotation of balls decreases as the equilibrium speed increases
Radius of rotation of balls increases as the equilibrium speed increases
Radius of rotation of balls increases as the equilibrium speed decreases
Radius of rotation of balls decreases as the equilibrium speed decreases

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