EMC Chapter 9

Question 1

The amount of ___ induced in a coil is determined by the rate at which the coil is rotated in a magnetic field.

Answer 1

voltage

Question 2

Field windings are electromagnets used to produce the ___ field in a generator.

Answer 2

magnetic

Question 3

A disadvantage of permanent magnets is that their magnetic lines of force ___ as the age of the magnet increases.

Answer 3

decrease

Question 4

A(n)___ is the movable coil of wire in a generator that rotates through the magnetic field.

Answer 4

armature

Question 5

Although increasing the number of ___ reduces the ripples in the output voltage, it is impossible to remove the ripples completely.

Answer 5

coils

Question 6

A ___ is a ring made of segments that are insulated from one another.

Answer 6

commutator

Question 7

Commutators segments reverse the connections to the brushes every ___ cycle.

Answer 7

half

Question 8

A brush is the sliding contact that rides against the commutator segments or slip rings and is used to connect the ___ to the external circuit.

Answer 8

armature

Question 9

The pulsations of a DC generator’s output voltage are known as ___.

Answer 9

ripples

Question 10

The ___ generator rule is the relationship between the current in a conductor and the magnetic field existing around the conductor.

Answer 10

left-hand

Question 11

There are ___ types of DC generators.

Answer 11

three

Question 12

The difference between the types of DC generators is based on the relationship of the ___ to the external circuit.

Answer 12

field windings

Question 13

Because of their poor voltage regulation, ___-wound DC generators are not used frequently.

Answer 13

series

Question 14

A shunt-wound generator is a generator that has its field windings connected in ___ (shunt) with the armature and the external circuit (load).

Answer 14

parallel

Question 15

A ___-wound generator is a generator that includes series and shunt field windings.

Answer 15

compound