Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

The system is unbalanced
Resonance is caused due to the heavy mass of the rotor
The shafts are rotating at very high speeds
Bearing centre line coincides with the axis

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Theory of Machine
Effort of a governor is the

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

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force is equal to zero
Resultant force and resultant couple are both equal to zero
Resultant couple is equal to zero

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and two additional links
One lower pair and two additional links
Any one of these
Two lower pairs and one additional link

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