If the sleeve of a watt governor is loaded with heavy mass, it becomes a ______ governor.

Explanation:

Governor:

• The function of a governor is to regulate the mean speed of an engine when there is a variation in the load.
•  When the load on an engine increases, its speed decreases, therefore it becomes necessary to increase the supply of working fluid. On the other hand, when the load on the engine decreases, its speed increases, and thus less working fluid is required. 
• The governor automatically controls the supply of working fluid to the engine with the varying load conditions and keeps the mean speed within certain limits. 

Types of governor:

Watt governor:

• In this governer, the pair of balls i.e. masses is attached to the spindle with the help of links as shown below.
• No dead weight is used in this governer.

Porter governor:

• Porter governor is dead weight loaded type of gravity controlled centrifugal governor. 
• It is similar to the Watt governor with slight modification.
• When a heavy central load is attached to the sleeve of the Watt governor, it becomes a porter governor.

Proell governor:

• A Proell governor is a modification of Porter governor.
• Here the two balls (masses) are fixed on the upward extensions of the lower links which are in the form of bent links BAE and CDF.

Hartnell governor:

• In this type of governor, the balls are controlled by a spring.
• Two bell crank levers, each carrying a mass at one end and a roller at the other are pivoted to a pair of arms that rotate with the spindle.