Deck 30: Dc Generators

Question 1

What provide(s) the magnetic field necessary for the operation of a DC machine?

A) brushes
B) pole pieces
C) the armature
D) the case

Answer 1

B

Question 2

A compound generator has both series and shunt field windings. When those windings are connected so they aid each other in the production of magnetism, that connection is called _____.

A) cumulative-compound
B) differential-compound

Answer 2

A

Question 3

The rotating part of a generator is called the _____.

A) stator
B) field
C) armature
D) exciter

Answer 3

C

Question 4

The output voltage of a generator is usually controlled by the amount of _____.

A) field excitation current
B) input voltage
C) input torque
D) armature excitation current

Question 5

_______________ is the twisting or bending of the magnetic lines of flux of the pole pieces.

Question 6

In a generator, the _____ permits part of the current that normally flows through the series field to flow through the resistor.

A) series field shunt rheostat
B) shunt field series rheostat
C) series field exciter
D) shunt field exciter

Question 7

What is the component of a DC generator that converts the armature AC into DC?

A) commutator
B) alternator
C) converter
D) field

Question 8

The series generator has only a series field, which is connected in _____ with the armature.

A) series
B) parallel

Question 9

Armatures are wound to provide high voltage, high current, or some specific combination of voltage and current. Which type of winding provides high voltage and low current?

A) frogleg-wound
B) lap-wound
C) wave-wound

Question 10

A compound generator has both series and shunt field windings. When those windings are connected so their fields oppose each other in the production of magnetism, that connection is called _____.

A) cumulative-compound
B) differential-compound

Question 11

The _____ ride against the commutator segments and are used to connect the armature to the external circuit of the DC machine.

A) field windings
B) pole pieces
C) armature windings
D) brushes

Question 12

The relationship of the strengths of the two fields in a generator determines the amount of _____.

A) complexing
B) compounding
C) exciting
D) differential setting

Question 13

_______________ is a measure of the useful electric energy produced by the generator.

Question 14

What is a device that converts mechanical energy into DC electrical energy?

A) an alternator
B) a generator
C) a motor
D) an inverter

Question 15

Shunt field windings are connected in parallel with the armature. They are wound with _____ turns of fairly _____ wire.

A) many; large
B) few; large
C) many; small
D) few; small

Question 16

Series field windings are connected in series with the armature. They are wound with _____ turns of fairly _____ wire.

A) many; large
B) many; small
C) few; large
D) few; small

Question 17

A generator containing both series and shunt fields is called a _____ generator.

A) self excited
B) separately excited
C) complex
D) compound

Question 18

Armatures are wound to provide high voltage, high current or some specific combination of voltage and current. Which type of winding provides moderate voltage and moderate current?

A) frogleg-wound
B) lap-wound
C) wave-wound

Question 19

Armatures are wound to provide high voltage, high current, or some specific combination of voltage and current. Which type of winding provides low voltage and high current?

A) frogleg-wound
B) lap-wound
C) wave-wound

Question 20

Shunt generators contain only a shunt field winding connected in _____ with the armature.

A) series
B) parallel