Polyphase Alternator

Question

What is the typical rating of exciter voltage?

A. 25 V

B. 50 V

C. 125 V

D. 400 V

Question

What type of rotors will an engine alternator usually have?

A. Salient-pole rotors with horizontal shafts

B. Salient-pole rotors with vertical shafts

C. Cylindrical rotors with horizontal shafts

D. Cylindrical rotors with vertical shafts

16. Which one of the following voltages is not a typical alternator voltage?

A. 125 VAC

B. 460 VAC

C. 4300 VAC

D. 13,800 VAC

Question

What is an infinite system?

A. An infinite system is one that isn’t connected to a load.

B. An infinite system is one that relies on all alternators to produce the proper voltage and current.

C. An infinite system is one that transmits power over a large network.

D. An infinite system is one that doesn’t rely on the operation of a single alternator.

Question
A static exciter unit will use what type of device to provide DC current to the field windings?

A. Semiconductor rectifier

B. A motor-generator set

C. Static straps

D. A direct-coupled generator

Question

In a two-pole alternator, one cycle of AC power will equal how many electrical degrees?

A. 90°

B. 180°

C. 270°

D. 360°

Question

In a three-phase or polyphase alternator, how are the coils spaced?

A. 90° apart

B. 120° apart

C. 150° apart

D. 180° apart