Brainscape's Knowledge GenomeTM

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


See full index

Power Plant > Generators > Flashcards

Generators Flashcards

1
Q

The generator left-hand rule

A

(T)humb- direction the conductor
(I)ndex - direction of the (f)lux lines
(M)iddle- direction of induced EMF

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

Two instrument used to measure current

A
  1. Ammeter

2. Galvanometer

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

The component which converts the AC output of a simple AC generator into DC out (Not an invertor)

A

Commutator

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

The method of how a commutator maintains DC output in a basic DC generator

A

At any given point, the brushes only make contact with 1 side of the commutator

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

Although the current reverses direction in DC generator, the ________ causes current to flow in only one direction

A

commutator

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

The 4 main parts of a DC generator

A
  1. Field frame (yoke)
  2. Commutator
  3. Brushes
  4. Armature
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The type of armature typically used in a DC generator

A

Drum-type

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

The two major components of the DC generator armature

A
  1. Iron core

2. winding

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

The two functions of the DC commutator split ring

A
  1. Collecting the current from the armature

2. Converting the AC current from the armature into DC output

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

Two typical construction materials of DC generator brushes

A
  1. carbon

2. graphite

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

The function of the carbon/ graphite brushes in a DC generator

A

To collect current from the moving commutator

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

The means at which the external circuit is connected to the carbon brushes

A

Pigtails

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

The 3 types of DC generators

A
  1. Series-wound
  2. Shunt-wound
  3. Compound
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The DC generator with the poorest voltage regulation capabilities

A

Series wound

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

The relationship between voltage and current in a series wound DC generator

A

The current through the field coils increases as the load voltage increases

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

Typical DC generator rating

A

300 amps, 28 V

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

The function of a current limiter in a DC Generator

A

Limiting of the generator output current in a DC generator

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

The function of the Reverse-current cutout in a DC generator

A

The disconnection of the battery from the generator when the generator output is lower than the battery output

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The reason why the reverse current cutout disconnects the battery from the generator during low generator output

A

If the generator output is lower than the battery output, the battery would discharge itself through the generator armature

20
Q

The term for When the battery attempts to discharge itself through the generator armature and attempts to drive the generator as a motor

A

Motoring

21
Q

The type of damage mostly found on contacts of any type

A

Pitting

22
Q

In a DC generator, the component that is in between the carbon brushes and the external circuit

A

The pigtails

23
Q

Brushes are held in place against the commutator via

A

Spring loaded brushes

24
Q

When the spring tension on a DC generator is poor, the most probable damage that will occur

A

DC generator Arcing occurs when

25
Q

The type of DC generator that a Starter Generator is

A

Compound

26
Q

Description of current flow through a starter generator during starting and then in generator mode

A

Starter mode- current flows through both series and shunt windings

Generator mode- current only flows through shunt windings

27
Q

If no direction of rotation is stamped on the data plate of the generator, the direction of rotation is marked by:

A

An arrow on the cover plate of the brush housing

28
Q

The 3 components that make up a three-unit regulator in a DC generator system

A
  1. Voltage regulator
  2. Current limiter
  3. Reverse current cutout
29
Q

Heavy duty DC generator systems use this type of voltage regulator

A

Carbon-pile voltage regulator is used in which type of system

30
Q

principle of operation of resistance in a carbon pile regulator

A

As pressure is increased to the stacks, the resistance goes down

31
Q

The two means of modulating pressure in a carbon pile for it to work

A
  1. Spring

2. Electromagnet

32
Q

The function of the spring in a carbon pile

A

Provides the means of compressing the carbon disc/ plates in a carbon pile

33
Q

The function of the electromagnet in a carbon pile

A

what Pulls the spring back in a carbon pile

34
Q

In a carbon pile voltage regulator, the generator output is in series with

A

The electromagnet which is in series with the output voltage

35
Q

The main benefit of a starter-Generator for an aircraft

A

Lesser weight than having a separator starter motor and separate generator

36
Q

Description of the Hacksaw Blade test

A

Place armature on growler and slowly rotate the armature while holding a thin hacksaw blade slightly above the armature. If there are shorts, the hacksaw Will vibrate

37
Q

Describe armature reaction

A

When current flows through the armature, the armatures magnetic field interferes with field between the generator poles

38
Q

Armature reaction becomes greater with

A

Generator load increase/ current

39
Q

hazard that Armature reaction can cause

A

Shorts between commutator and brushes

40
Q

The way that generators counteract armature reaction

A

Inter poles

41
Q

Inter-poles are wired in _______with the load on the generator

A

Series

42
Q

The letters of the 3 terminals on a generator

A

A, B, E

43
Q

The positive armature lead attaches to the terminal labeled ______ on a generator

A

B

44
Q

The negative armature lead attaches to the terminal labeled ______ on a generator

A

E

45
Q

The positive end of the shunt wingdings attaches to the terminal labeled ______ on a generator

A

A

Power Plant (23 decks)

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