The following terms used in governors are important from the subject point of view ;

**1.****Height of a governor. **It is the vertical distance from the centre of the ball to a point where the axes ofthe arms (or arms produced) intersect on the spindle axis. It is usually denoted by h.

**2.**** ****Equilibrium speed. **It is the speed at which the governor balls, arms etc., are in complete equilibriumand the sleeve does not tend to move upwards or downwards.

**3.**** ****Mean equilibrium speed. **It is the speed at the mean position of the balls or the sleeve.

**4.**** ****Maximum and minimum equilibrium speeds. **The speeds at the maximum and minimum radius ofrotation of the balls, without tending to move either way are known as maximum and minimum equilibrium speeds respectively.

**Note : **There can be many equilibrium speeds between the mean and the maximum and the mean and theminimum

equilibrium speeds.

**5.**** ****Sleeve lift. **It is the vertical distance which the sleeve travels due to change in equilibrium speed.

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