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Airframe Electrical > Quiz 2 > Flashcards

Quiz 2 Flashcards

0
Q

In aviation, what are the three general purposes of batteries?

A

Ground ops, to absorb spikes in voltage from the generator or alternator, emergency back up voltage .

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1
Q

What is a battery?

A

A device composed of two or more cells on which chemical energy is converted into electrical energy.

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2
Q

Can a primary cell be recharged?

A

No!

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3
Q

Can a secondary cell be recharged?

A

Yes!

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4
Q

What are the three different forms of cells?

A

Dry, wet, gel.

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5
Q

What are the forms of cells based on?

A

The form of the electrolyte.

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6
Q

What do alkaline batteries consist of?

A

Lead dioxide, spongy lead, inserted into a solution of sulphuric acid and water.

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7
Q

What kind of cell are alkaline batteries?

A

Primary ( dry)

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8
Q

What tests are used for determining the condition of lead acid batteries?

A

Hydrometer test, load test, high rate discharge test.

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9
Q

What does a high discharge test give an indication of?

A

Capacity

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10
Q

What does a hydrometer test give an indication of?

A

The stage of charge of the battery .

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11
Q

What does a load test give an indication of?

A

The state of charge of a battery

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12
Q

What is important to remember when servicing lead acid batteries?

A

Remove the negative terminal first!

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13
Q

What is a NiCad battery composed of?

A

Nickel hydroxide, metallic cadmium, inserted into potassium hydroxide and water.

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14
Q

What is the only way to test NiCads?

A

A high discharge test.

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15
Q

What should be used to neutralize any spilled electrolyte from
NiCad batteries?

A

Boric acid

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16
Q

What must be remembered when servicing batteries?

A

Keep NiCads and Lead Acids away from each other.

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17
Q

What must be done when servicing NiCads?

A

They must be deep cycled to prevent memory and thermal runaway.

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18
Q

What is a generator?

A

A device that changed mechanical energy into electrical energy.

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19
Q

What is the operation of generators based on?

A

Electromagnetic induction.

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20
Q

The amount of potential produced by a generator is based on what two things?

A

Strength of flux field

The rate at which flux is cut

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21
Q

What provides initial excitation?

A

Initial excitation is provided by lines of flux producing what is called residual magnetism.

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22
Q

What is excitation current?

A

The current passed through the electromagnet, used to produce, strengthen and control the flux field.

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23
Q

What are the four components of a generator?

A

Field, armature, brush assembly, structural parts.

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24
Q

What is the purpose of the field?

A

To provide the lines of flux for the conductor to cut through.

25
Q

What is the purpose of the armature?

A

It acts as a conductor which cuts the lines of flux, into which the voltage is induced to produce a “ system” current.

26
Q

What is the purpose of the brush assembly?

A

It transfers the system current from the commutator to the housing wiring?

27
Q

What is the purpose of the structural parts ?

A

To support the field and armature.

28
Q

What are the three types of DC generators?

A

Series wound, shunt wound, compound wound.

29
Q

What is an advantage associated with series wound gens?

A

It has higher output capabilities with respect to current and voltage

30
Q

What is a disadvantage associated with series wound gens?

A

It is hard to control the output

31
Q

What is an advantage associated with shunt wound gens?

A

They are easier to control output?

32
Q

What is an advantage associated with compound wound generators?

A

They have a higher current and output voltage capability, and are easier to control.

33
Q

What is a disadvantage associated with compound wound generators?

A

They are more complex, and heavier.

34
Q

What is the output control of a generator based upon?

A

The current through the field, the speed at which it turns.

35
Q

What is RCCR?

A

Reverse current cutout relay!

36
Q

What is output for AC systems controlled by?

A

Voltage regulator
Current limiter
Reverse current cutout relay

37
Q

What is needed to troubleshoot CSD/IDG?

A

Specific maintenance manual

38
Q

What is an IDG?

A

Integrated drive generator

39
Q

What is a CSD?

A

Constant speed drive.

40
Q

What is an APU?

A

Auxiliary power unit

41
Q

What is the purpose of a constant speed drive?

A

To take rotational power from the engine and no matter what the engine speed, turn the generator at a constant speed.

42
Q

What is the difference between an IDG and a CSD?

A

An IDG is simply a CSD and a generator combined into one unit.

43
Q

What is an alternator?

A

A device which changes mechanical energy into electrical energy by electromagnetic induction.

44
Q

What is the principle of alternator operation based on?

A

Electromagnetic induction.

45
Q

What is the fundamental difference between a generator and an alternator?

A

The relationship between the conductor and the flux field.

46
Q

What is the amount of potential produced in an alternator based on?

A

The strength of the flux field

The rate at which flux are cut

47
Q

Can alternators produce their own initial excitation?

A

Nope

48
Q

What is the purpose of the strator?

A

It serves the same purpose as the armature in the generator.

49
Q

What is the purpose of the rotor?

A

to provide lines of magnetic flux for the conductor to cut through.

50
Q

What is the purpose of a rectifier?

A

It is used to convert AC into DC.

51
Q

What is flux produced by in an alternator?

A

The rotor, which rotates with 8-12 poles.

52
Q

What is flux produced by in a generator?

A

The field, stationary with 2-4 poles.

53
Q

What is system current produced by in an alternator?

A

The stator

54
Q

What is system current produced by in a generator?

A

The armature (rotating)

55
Q

What kind if core does an alternator have?

A

A very small rotating core, so it can spin faster.

56
Q

What kind of core does a generator have?

A

A very large rotating core, it is heavier and cannot spin as fast.

57
Q

What kind of brushes are in an alternator?

A

Very small brushes

58
Q

What kind of brushes are used in generators?

A

Very large brushes

59
Q

What kind of rectifier is used in an alternator?

A

Solid state rectifier

60
Q

What kind of rectifier is used in a generator?

A

A mechanical rectifier.

61
Q

What advantages does an alternator have over a generator?

A

Physical size,
It is capable of greater output
The brushes can be smaller and last longer

Airframe Electrical (5 decks)

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