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Craig > Electrical > Flashcards

Electrical Flashcards

1
Q

How many NiCad batteries are there on the aircraft?

A

3

MAIN, AUX, STBY

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2
Q

How many engine-driven DC starter-generators are there on the aircraft?

A

2 (1 each engine)

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3
Q

How many Transformer Rectifier Units (TRUs) are there on the aircraft?

A

2

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4
Q

How many APU generators are there on the aircraft?

A

1

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5
Q

T/F: The electrical system comprises both a direct current (DC) system and an alternating current (AC) system

A

TRUE (28VDC and 115VAC)

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6
Q

T/F: DC power to the electrical system is supplied by two engine-driven DC generators only.

A

FALSE, 3 batteries, 2 TRUs, the APU Generator, and External Power can be used

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7
Q

T/F: Circuit breaker panels can be found in the left and right main landing gear wheel wells.

A

TRUE (in the AC Contactor boxes)

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8
Q

How many circuit breaker panels are there in the flight compartment?

A

4

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9
Q

Which of the following are NOT electrical buses?

answer with which of the following ARE electrical buses?

A 
L & R Main Bus
L & R Secondary Bus
L & R Essential Bus
L & R AC Bus
Battery Bus
(Note: emergency bus is NOT a bus)
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10
Q

The aircraft is equipped with which of the following batteries?

A

Main
Auxiliary
Standby

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11
Q

Which batteries are used for engine starting when ground power is not available?

A

Only MAIN and AUX batteries

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12
Q

How long will the batteries power the aircraft if normal electrical power fails?

A

up to 60 minutes

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13
Q

How many battery switches are there?

A

4 switches on DC control panel (Battery Master, MAIN BATT, AUX BATT, and STBY BATT)

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14
Q

T/F: If the battery master is in the OFF position, the other batteries can still be used to power the aircraft?

A

FALSE

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15
Q

T/F: When the battery master is in the OFF position, all battery power is turned off no matter what position the other switches are in.

A

TRUE

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16
Q

If the battery is being charged at a 100% rate of charge, how will it be depicted on the MFD Battery page?

A

1.00 because that is 100% normal charge rate

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17
Q

How is a battery that is discharging displayed on the MFD Electrical page?

A

It will have a “-“ sign and a percent discharge (ie. -.30 = 30% over maximum rate of discharge)

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18
Q

When the battery temperature is within limits, what color does it display as on the MFD Electrical page?

A

White

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19
Q

When the battery temperature exceeds normal limits, what colors would display on the MFD Electrical page?

A

Amber
or
Red

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20
Q

If any battery temperature is 50 degrees C to 65 degrees C, what color does the battery temperature display as on the MFD Battery page?

A

Amber

21
Q

Where can the GPU be connected to the aircraft for DC power?

A

Left forward fuselage

22
Q

When connected to external power on the ground, DC EXT PWR ON is displayed in what color?

A

Green when connected

23
Q

T/F: The EPCU protects the system from too high and too low DC power voltage from the DC external power source.

A

TRUE

24
Q

After engine start, how many volts does the DC generator provide?

A

28VDC

25
Q

Where are the Transformer Rectifier Units (TRUs) located?

A

Nose of aircraft

26
Q

TRUs change 3-phase 115VAC to what?

A

28VDC

27
Q

During normal operation, which busses do the TRUs power?

A

L or R Secondary (“Feeder”) buses

28
Q

A L TRU caution light will illuminate when what happens?

A

TRU is offline or fails

29
Q

On the ground, what busses does the APU generator provide power for?

A

L & R Main bus
L & R Secondary Bus
L & R Essential Bus

30
Q

What does it mean when a plus sign (+) is displayed in front of a value on the MFD Electrical page?

A

Indicates an overload of the power source

31
Q

The entire DC electrical system can still be powered when up to how many power sources have failed?

A

2 power sources

32
Q

When does the EPCU send a signal to the generator to trip it offline during a Main DC bus fault?

A

If the fault persists for 5 seconds or more

33
Q

If the Right Main Bus has a bus fault, which battery is disconnected from the system?

A

The Main Battery

34
Q

T/F: If a Secondary bus fault occurs, the increased current will trip the circuit breaker for the respective TRU.

A

TRUE

35
Q

In addition to an inoperative TRU, what is required for the EPCU to enter emergency mode?

A

Airplane in air

Both DC generators unavailable

36
Q

In addition to a dual DC Generator failure, what is required for the EPCU to enter emergency mode?

A

Airplane in air

At least 1 TRU unavailable

37
Q

T/F: In EPCU emergency mode, the batteries are the main source of power.

A

TRUE

38
Q

When in EPCU emergency mode, which busses automatically disconnect from the batteries?

A

Main busses

39
Q

What is the voltage output of the AC generators?

A

115VAC 3-phase

40
Q

Where are the AC generators mounted on the aircraft?

A

On each engine’s propeller reduction gearbox

41
Q

How many external AC power ports are there on the aircraft?

A

1 AC power port (on inboard side of right engine nacelle)

42
Q

When the aircraft is powered by external DC power, which busses are powered?

A

L & R Main
L & R Secondary
L & R Essential

43
Q

T/F: When a DC generator fails, the Main Bus Tie switch must be manually selected to keep the associated Main DC bus powered.

A

FALSE, EPCU can change the status of the bus tie automatically

44
Q

Which switch would pilots use to connect the main battery to its associated Main feeder bus?

A

The MAIN BATT switch

45
Q

T/F: The electrical system has a single hot battery bus to keep certain items powered at all times.

A

TRUE

46
Q

T/F: The hot battery bus can be powered by any of the 3 batteries.

A

FALSE, standby battery only

47
Q

At what point will DC electrical bus load shedding begin?

A

3 (or more) DC source failures

48
Q

In EPCU Emergency mode, the _____ are the main power source for the available DC busses.

A

Batteries

49
Q

The AC generators connect to the system when the engines are running, GEN 1 and 2 switches are selected ON, and _____.

A

condition levers are in MIN to MAX range

Craig (26 decks)

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