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ELEC 279 > Mod 6-7-8 > Flashcards

Mod 6-7-8 Flashcards

1
Q

A TRU is a ______ rectifier unit.

A

Transformer

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2
Q

process of converting AC to DC

A

Redtification

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3
Q

____ inverter uses a motor connected to a generator to convert DC to AC voltage.

A

Rotary

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4
Q

_____ are used in rectifier circuits.

A

Diodes

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5
Q

Changes DC voltage to a different value of DC voltage

A

converter

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6
Q

____ inverters are solid state, with no moving parts

A

static

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7
Q

TRUs are often found on _____ aircraft.

A

Larger

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8
Q

The full wave bridge rectifier uses a transformer and _____ diodes.

A

four

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9
Q

Transformers are used to ______ AC voltages from one level to another.

A

covert

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10
Q

What component on an aircraft converts DC voltage to AC voltage?

A

Inverter

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11
Q

What component on an aircraft converts AC voltage to DC voltage?

A

TRU

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12
Q

What does TRU stand for?

A

Transformer Rectifier Unit

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13
Q

If you wanted to convert 115VAC to 26 volts AC, the easiest way would be to use a?

A

Transformer

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14
Q

If I connect a DC motor to an AC generator, I’m basically converting DC to AC, we call this a _______________ on an aircraft.

A

Rotary inverter

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15
Q

when we convert AC to DC on an aircraft we call it a ___, and when we convert DC to AC we call it an ______

A

TRU - Inverter

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16
Q

An inverter (DC to AC) made out of all “solid state” parts (electronic components) is called a

A

Static Inverter

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17
Q

Frequency wild” means there is _____________________, and can only be used for things like lighting, heaters and TRU’s.

A

no frequency control/regulation

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18
Q

What controls the frequency on an AC generator?

A

CSD or IDG.

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19
Q

If I lose one of my generators (Fails in flight), and the remaining one cannot handle the electrical load the ______________ will automatically shed (disconnect) all none critical loads like entertainment systems, coffee makers, ovens and the like.

A

BPCU Buss Power Control Unit

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20
Q

The voltage and output current are controlled by the ____________

A

Voltage regulator.

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21
Q

You control the voltage out of a brushless AC generator by varying the DC current to the________

A

Exciter field.

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22
Q

What are the main functions of the GCU?

A

Voltage regulation, Gen line contactor control, over voltage protection, over and under load protection, and reverse current and differential voltage protection.

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23
Q

A three phase generator is just 3 single phase generators stuffed into one housing separated by ____degrees.

A

120

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24
Q

What is meant by a split buss and a parallel Buss?

A

In a split buss system only one source of power is provided to a buss at any given time.

in a parallel buss More than one source of power can be on the buss as long as conditions are met.

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25
Q

The ____ controls load shedding for in the electrical system.

A

BPCU

26
Q

To match AC generators, frequency, voltage and____ must be closely matched.

A

phase

27
Q

a CSD is a _____ speed drive.

A

Constant

28
Q

Frequency wild is when there is no ____ of the output frequency of the AC generator.

A

control

29
Q

_____ Current protection is necessary so the battery does not feed back to the generator.

A

Reverse

30
Q

IDG stands for Integrated _____ generator.

A

Drive

31
Q

The purpose of a Voltage ____ is to maintain a constant output under varying output current.

A

Regulator

32
Q

AC generators are controlled by ____ the amount of DC current in the Exciter field.

A

varying

33
Q

The _____ system does not need to be paralleled

A

Split Bus

34
Q

The ________ Control Unit has many different functions, including Voltage Regulation.

A

Generator

35
Q

How is the APU generator frequency controlled?

A

It isn’t, an APU is a constant speed motor

36
Q

How many generator can power a given bus at a time?

A

ONE! On a split bus system.

37
Q

List the 5 possible sources that can power the Essential bus on a Split bus distribution system

A

ANY/ALL. GEN 1, GEN 2, APU, GND PWR, of ADG, but only ONE at a time.

38
Q

What is an ADG? What’s a RAT?

A

AIR Driven Generator, RAM AIR TURBINE, same thing

39
Q

TRUs contain a _____ Transformer.

A

stepdown

40
Q

The APU will run at a ____ speed, so does notneed a CSD.

A

constant

41
Q

The SAIT Challengers have _____ TRUs.

A

four

42
Q

All Generators maintain equal load sharing in a_____ bus system.

A

parallel

43
Q

A RAT is a ____ air turbine

A

RAM

44
Q

On smaller aircraft, a _____ is used to convert the 115VAC to 26VAC.

A

Transformer

45
Q

The TRU uses ____ phase AC voltage as its input.

A

three

46
Q

BITE stands for ____ in test equipment

A

built

47
Q

The ______ is the final stage of a static inverter.

A

amplifier

48
Q

An ADG is an ____ driven generator

A

Air

49
Q

TYPE OF RECTIFIER

A

HALF WAVE RECTIFIER

50
Q

TYPE OF RECTIFIER

A

FULL WAVE RECTIFIER -CENTER TAP TRANSFORMER

51
Q

TYPE OF RECTIFIER

A

FULL WAVE BRIDGE RECTIFIER

52
Q

The output of the AC generator is determine by ?

A

The amount of DC current applied applied to the rotating field winding.

53
Q

What does the GCU?

A

provides the voltage regulation function by controlling the current in the field winding

54
Q

funtions of the AC Generator control unit (GCU)

A
  • voltage regulator
  • generator line contactor control
  • overvoltage protection
  • overload and under voltage protection
  • reverse current and defferential voltage protection
55
Q

what is the BPCU?

A

Bus power control unit is the controller thats performs load shedding function.

56
Q

When generators provides power for split buss____________

A

their is no need for a parallel

57
Q

when generators provide power for a parallel buss_________________

A

they need to be parallel

58
Q

what are the conditions that need to be met in order to parallel AC sourses

A

Voltage, frequency and phasing must be very closely matched

59
Q

AC Frequency wild

A
  • A/C Generator driven from the engine with no CSD or IDG
  • Frecuency follows engine RPM
  • saving on wheight and maintenance
  • used where components are not sensitive to frequency
60
Q

what tpe of power distribution system is this

A

parallel buss

all the Gens will be tide togheter by tide buss

61
Q

what tpe of power distribution system is this

A

Split bus

Both GEN wont run the same buses but you can make one Gen run the other one

ELEC 279 (4 decks)

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