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Question 1

The voltage output of an ac generator is controlled by:

Answer 1

B) Varying the DC exciter voltage

Question 2

The major difference between various voltage regulator systems is merely the method by which

Answer 2

A) field circuit resistance and current are controlled

Question 3

The voltage held by the vibrating type voltage regulator can be adjusted by:

Answer 3

C) Varying the weight W and adjusting the tension of the DC solenoid spring

Question 4

All the following statements concerning the rheostat type voltage regulator are true except for:

Answer 4

D)The primary purpose of the exciter field rheostat is to adjust the generator output voltage

Question 5

Wide range excitation control is sometimes provided for in voltage regulator arrangements for large generators using separately excited main exciters by using a:

Answer 5

Wheatstone bridge rheostat

Question 6

When the regulator control switch for the amplidyne voltage regulator is on the On position the effect is to:

Answer 6

D) All three of the above

Question 7

In order to provide for proper division of reactive current between ac generators operating in parallel, their voltage regulators incorporate a scheme called

Answer 7

B) Cross Current compensation

Question 8

Of the following statements concerning synchronous condensers, which one is not true

Answer 8

C) the excitation range is maintained less than that for ac generators to prevent loss of synchronism

Question 9

In the rheostat type voltage regulator, when the terminal voltage of the AC generator starts to fall the action of the torque motor

Answer 9

B) short circuits more of the high resistance plates

Question 10

System stability can be maintained and faster time response to load changed obtained by using voltage regulators equipped with:

Answer 10

A) both a feedback control system and an electronically controlled separate motor