Deck 16: Dc Generators

Question 1

Armature core disks are commonly called ____.

A) stators
B) brushes
C) commutators
D) laminations

Answer 1

D

Question 2

A generator's coils produce the most voltage when they move parallel to the magnetic lines of force.

Answer 2

False

Question 3

Two basic types of windings are in general use for DC generator armatures: the lap winding and the parallel winding.

Answer 3

False

Question 4

A(n) ____ winding is used to obtain high current capacity.

A) wave
B) lap
C) parallel
D) alternating

Question 5

The current decreases as the armature coils of a generator move through the ____ plane. Theoretically, the current drops to zero.

A) null
B) negative
C) neutral
D) neutronic

Question 6

A(n) ____ generator is a type of self-excited generator in which the field and armature are connected in parallel.

A) parallel
B) compound
C) shunt
D) series

Question 7

In a(n) ____ generator, the magnetization current for the field coils is supplied from a source outside of the generator. This supply may be another DC generator, batteries, or a rectifier.

A) self excited
B) separately excited
C) shunt
D) externally excited

Question 8

In the past, ____ generators were used extensively for series arc lighting, particularly for street lighting.

A) parallel
B) compound
C) shunt
D) series

Question 9

When magnetism is used to produce electricity, it makes no difference whether the conductor moves through the field or the magnetic field moves across the conductor.

Question 10

____ connect the commutator to the load conductors.

A) Brushes
B) Alternators
C) Laminations
D) Yokes

Question 11

The stationary part of the generator is called the rotor.

Question 12

To prevent the possibility of unwanted load shifting when connecting compound generators in parallel, connect the series field of each machine to a common ____.

A) neutral plane
B) alternating bus
C) equivalent circuit
D) equalizer bus

Question 13

____ windings eliminate armature reaction.

A) Compensating
B) Conducting
C) Alternating
D) Brushless

Question 14

A commutator is a type of rotating switch that changes the connections to the load circuit at the same instant as the emf reverses in the armature.

Question 15

A generator that maintains a nearly constant output voltage from no load to full load has excellent ____.

A) voltage control
B) voltage regulation
C) efficiency
D) responsiveness