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Q400 SV > Electrical > Flashcards

Electrical Flashcards

1
Q

How many NiCad batteries are there on the aircraft?

A

Three.

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2
Q

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

A

Two.

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3
Q

How many transformer rectified units (TRUs) are there on the aircraft?

A

Two.

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4
Q

How many APU generators are there on the aircraft?

A

One.

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5
Q

T or F: the electrical system comprises both a direct current (DC) system and an alternating current (AC) system.

A

True.

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6
Q

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

A

False, it is also supplied by three NiCad batteries, two TRUs, and an APU generator.

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7
Q

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

A

True.

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8
Q

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

A

Four.

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9
Q

Which of the following are NOT electrical buses?

A

There is no emergency bus.

These are buses: battery bus, left and right essential buses, left and right main buses, left and right secondary buses.

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10
Q

The aircraft is equipped with which of the following battteries?

A

Three 24V batteries: main, auxiliary, standby.

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11
Q

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

A

Main and auxiliary.

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12
Q

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

A

60 minutes.

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13
Q

How many battery switches are there?

A

Four (one for each battery and a master).

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14
Q

T or 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 or 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

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17
Q

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

A

A negative number.

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18
Q

When the battery temperature is within limits, what color does it display 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

Yellow then red.

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20
Q

If any battery temperature is 50 - 65ºC, what color does the battery temperature display as on the MFD battery page?

A

Yellow.

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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.

23
Q

T or 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

28V DC.

25
Q

Where are the transformer rectifier units (TRUs) located?

A

In the nose.

26
Q

TRUs change 3-phase 115v AC to what?

A

28V DC.

27
Q

During normal operation, which busses do the TRUs power?

A

Left or right secondary bus.

28
Q

A L TRU caution light will illuminate when what happens?

A

The left TRU is offline or has failed.

29
Q

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

A

Left and right main, essential, and secondary buses.

30
Q

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

A

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

Two.

32
Q

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

A

After 5 seconds.

33
Q

If the right main bus has a bus fault, which battery is disconnected from the system?

A

Main battery.

34
Q

T or 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 is in the air, both DC generators are not available.

36
Q

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

A

Airplane is in the air, at least one TRU is not available.

37
Q

T or 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 buses.

39
Q

What is the voltage output of the AC generators?

A

Three-phase 115V AC.

40
Q

Where are the AC generators mounted on the aircraft?

A

Propeller reduction gearbox.

41
Q

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

A

One.

42
Q

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

A

Left and right main, essential, and secondary buses.

43
Q

T or 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, the EPCU can override switch position.

44
Q

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

A

MAIN BATT.

45
Q

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

A

True.

46
Q

T or F: the hot battery bus can be powered by any of the three batteries.

A

False.

47
Q

At what point will DC electrical bus load shedding begin?

A

Three DC sources fail.

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 the MIN to MAX range.

50
Q

Which of the following statements regarding the AC cross tie function is most accurate?

A

It works automatically to ensure both AC buses are powered in the even of an AC generator failure.

Q400 SV (24 decks)

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