m₁ r₂ = m₂ r₁
m₁ m₂ = r₁ r₂
None of these
m₁ r₁ = m₂ r₂

## Theory of Machine A spring controlled governor is found unstable. It can be made stable by

Decreasing the spring stiffness
Increasing the ball mass
Decreasing the ball mass
Increasing the spring stiffness

## Theory of Machine Klein's construction can be used when

Crank has uniform angular velocity and angular acceleration
Crank has uniform angular acceleration
Crank has non-uniform velocity
Crank has a uniform angular velocity

Are in phase
Lags by 90°

## Theory of Machine When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

To raise the stern and lower the bow
To move the ship towards port side
To raise the bow and lower the stern
To move the ship towards starboard

## Theory of Machine Whirling speed of the shaft is the speed at which

Shaft tends to vibrate vigorously in transverse direction
Torsional vibrations occur
Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate in longitudinal direction