PHEB_11B

Question 1

A governor monitors the speed of a pumping unit. a) true b) false

Answer 1

b) false ref: p. 3

Question 2

Additional load applied to the generator will cause the speed to: a) increase b) decrease

Answer 2

b) decrease ref: p. 3

Question 3

When two or more generating units are operating in parallel, and are part of a generating system, it is necessary for all governors to respond to load changes a) true b) false

Answer 3

b) false ref: p. 3

Question 4

The governor element that detects and responds to any change in speed of the turbine is the: a) servomotor b) relay valve c) oil pressure system d) governor ballhead

Answer 4

d) governor ballhead ref: p. 4

Question 5

The governor ballhead receives its power from: a) servomotor b) relay valve c) PMG d) speed changer

Answer 5

c) PMG ref: p. 4

Question 6

The pilot valve is actuated by the: a) servomotor b) PMG c) relay valve d) fly balls

Answer 6

d) fly balls ref: p. 4

Question 7

Hydraulic pistons operated by oil pressure and used to transmit motion from the governor to the gate or needle valves are called _______. a) b) servomotors c) d)

Answer 7

servomotors ref: p. 7

Question 8

If the pilot valve plunger is raised, the gate will start to: a) open b) close

Answer 8

a) open ref: p. 9

Question 9

Governor component that provides a means of controlling the opening of the gates during start-ups and until the unit is up to normal speed, is called: a) relay valve b) PMG c) gate limit device d) governor ballhead

Answer 9

‘c) gate limit device ref: p. 9

Question 10

The chief causes of governor oil failure are oxidation and__________. a) b) contamination c) d)

Answer 10

contamination ref: p. 12

Question 11

Visual indications of possible oil deterioration are: a) sludge b) dark or cloudy color c) dirty filter d) all of the above

Answer 11

d) all of the above ref: p. 12

Question 12

Governors with ________ speed droop will attempt to take all additional load that comes on a system: a) 0% b) 3% c) 5% d) 10%

Answer 12

a) 0% ref: p. 20

Question 13

The valve that permits the operator to select either the relay valve or the auxiliary valve to move the wicket gates, deflectors, or nozzles is called: a) pilot valve b) main valve c) transfer valve d) control valve

Answer 13

c) transfer valve ref: p. 24

Question 14

An example of a governor safety device is: a) low oil pressure switch b) oil tank float valve c) overspeed devices d) all of the above

Answer 14

d) all of the above ref: p. 29