Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Basic Electricity 2 > Chp 17 Electrical Systems > Flashcards

Chp 17 Electrical Systems Flashcards

1
Q

What are the two types of current electricity

A

Alternating current

Direct current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Electricity produced by Magnetism is?

A

Alternating current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What determines the current flow as a result of magnetism induction?

A

Strength of the magnetic field
The number of conductors passing through the field
Speed with which field is crossed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A generator in which slip rings and brushes carry the current from the armature produces?

A

Alternating current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When a conductor is moving parallel to lines of magnetic flux, the current in the conductor is?

A

At its minimum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The electricity produce from the armature coils of the DC generator is

A

Alternating current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A generator in which a communator and brushes carry the current from the armature produces?

A

Direct current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The current that flows in a DC generator field coil is taken from the?

A

Generator armature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The magnetism for producing in the initial excitation current in a DC generator is?

A

Residual magnetism in the generator frame

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The voltage produced by a generator when no field current is flowing is?

A

Residual voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Residual voltage in a DC generator is approximately how many volts or less?

A

2 V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Residual voltage is lost when a generator is disassembled it is restored by what?

A

Field flashing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When flashing the field of a DC generator current is directed through the field coils in the blank direction as normal flow?

A

Same direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In a shunt connected DC generator the field coils are in what with the Armature?

A

Parallel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

In a compound wound DC generator the voltage regulator Is in the blank field?

A

Shunt field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The core of the armature used in a DC generator is made up of what?

A

Laminated soft iron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The position of the armature in a DC generator in which there is no potential difference between the ends of the adjacent coils is called the blank and blank

A

Neutral position or neutral plate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The neutral plane of an uncompensated DC generator shifts as the blank current changes

A

Armature

19
Q

The brushes of a DC generator are located in the neutral plane to minimize what?

A

Brush arcing

20
Q

What is magnetic flux

A

Lines used to represent a magnetic field

21
Q

What is magnetic field

A

The invisible but measurable force surrounding a permanent magnet or current carrying conductor

22
Q

What is a slip ring 

A

A smooth continuous ring of brass or copper mounted on the rotor shaft of an electrical generator or alternator. Brushes riding on the smooth surface of the slippering carry current into and out of the rotor coil

23
Q

What is a rectifier

A

A device that allows electrons to flow in one direction while preventing their flow in the opposite direction

24
Q

What is a commutator

A

A mechanical rectifier mounted on the armature shaft of the DC generator. Carbon brushes riding on the commutator carry current into and out of the armature

25
Q

What is Pulsating DC

A

Direct current who voltage periodically changes, but who’s electrons flow in the same direction all of the time

26
Q

Note

A

A DC generator produces alternating current, but is rectified by the commutator and brushes before leaving the generator

27
Q

What is a permanent magnet

A

A piece of hardened steel that has been exposed to a strong magnetizing force which has aligned the spin axis of the electrons surrounding its atoms

28
Q

What is an electromagnet

A

A magnet produced by an electrical current flowing through a coil of wire

29
Q

What is residual magnetism

A

The magnetism that remains in the field frame of a generator when no current is flowing through the field coils

30
Q

What is residual voltage

A

The voltage produced in a generator armature when the armature is rotated in the residual magnetism

31
Q

What is flashing the field

A

A maintenance procedure that restored residual magnetism to a DC generator field frame

32
Q

What is a short circuit

A

A low resistant connection between two points in electric circuit

33
Q

What are the three types of field generators

A

Sorties
Shunt
Compound

34
Q

What is a slow blow fuse

A

A special type of circuit protection device that allows a momentary flow of excess current, but opens the circuit if the excess flow is sustained

35
Q

What is a current limiter

A

Pass a momentary excess of current, but if the circuit uses more than the generators rated current for an extended period of time, a fuse will sever and protect the component

36
Q

Reverse current cut out and switch

A

Protects the generator from acting as a motor is the battery voltage is higher than the generators voltage

37
Q

Carbon pile voltage regulator

A

A voltage regulator for a high output dc generator that uses a stack of pure carbon disk for the variable resistance element

38
Q

What are the three primary advantages of dc alternators of ax

A

More sets of field poles produce current at a lower speed.

High current produced in stationary component is rectified by semi conductors diodes

An alternator charging system is lighter weight than a generator charging system

39
Q

What is the rotor of a dc alternator composed of

A

Coils and poles

40
Q

What is distributed pole stator winding

A

Alternator stator windings wound in a sieries of slots in the stator frame

41
Q

What’s the two parts of a dc alternator

A

Rotor and stator

42
Q

What’s transformed ac power to dc power

A

Transformer rectifier

43
Q

What is a constant speed drive

A

Component mounted between an ac generator and an aircraft engine that holds the generator speed and frequency constant as the engine varies through its normal operating state

44
Q

Inverter make up

A

28 volt 115 volt 3 phase and 400 hertz

Basic Electricity 2 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions