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Q400 > Electrical > Flashcards

Electrical Flashcards

1
Q

How many NiCad batteries are there on the aircraft?

A

3

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2
Q

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

A

2

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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

True or False: The electrical system comprises both a direct current (DC) system and an alternating current (AC) system.

A

True

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6
Q

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

A

False

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7
Q

True or False: 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

4

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9
Q

Which of the following are NOT electrical buses?

A

TE ]

<>

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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

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

A

60 minutes

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12
Q

How many battery switches are there?

A

4

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13
Q

. True or False: 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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14
Q

True or False: 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

False

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15
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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16
Q

How is negative discharge on a battery indicated on the MFD Battery page?

A

-.XX

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17
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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18
Q

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

A

Yellow +50C to +65C,

Red Exceeds +65C

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19
Q

If any battery temperature is 50 degrees C to 60 degrees C, what color does the battery temperature display as on the MFD Battery page?

A

Amber

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20
Q

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

A

Left forward fuselage

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21
Q

When connected to external power on the ground, what is displayed on the MFD Electrical page?

A

DC External Power On

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22
Q

True or False: The EPCU protects the system from too high and too low DC power voltage form the external power source.

A

True

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23
Q

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

A

28V DC Power

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24
Q

Where are the Transformer Rectifier Units (TRUs) located?

A

The nose compartment

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25
Q

TRUs change 3-phase 115v AC to what?

A

28V DC Output

26
Q

During normal operation, which busses do the TRUs power?

A

Left or Right Secondary bus

27
Q

A L TRU caution light will illuminate when what happens?

A

The respective Left or Right TRU is off or has failed

28
Q

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

A

6 Buses

29
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

30
Q

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

A

2

31
Q

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

A

5 Seconds or more

32
Q

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

A

Main battery

33
Q

True or False: If a Secondary bus fault occurs, the increased current will trip the circuit breaker for the respective TRU.

A

True

34
Q

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

A

Airplane in Air both DC Generators are not available

35
Q

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

A

Airborne at least 1 TRU is not available

36
Q

True or False: In emergency mode, the batteries are the main source of power.

A

True

37
Q

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

A

Main Bus

38
Q

What is the voltage output of the AC generators?

A

115V

39
Q

Where are the AC generators mounted on the aircraft?

A

Propeller reduction gear box

40
Q

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

A

1 - INBD SIDE OF #2 NACEL

41
Q

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

A

6

L/R Essential
L/R Main
L/R Secondary

42
Q

True or False: When a DC generator fails, the Main Bus Tie switch must be manually selected.

A

False

43
Q

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

A

Main Battery Switch

44
Q

How many batteries is the aircraft equipped with?

A

3

45
Q

True or False: When a minus sign (-) is shown before a number on the MFD Electrical page, it means the battery is discharging.

A

True

46
Q

At what point will electrical bus load shedding begin?

A

If more than 2 DC Sources Fail

47
Q

In emergency mode, the _____ are the main energy source for the airplane.

A

Batteries

48
Q

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

A

Condition levers are in Min to Max range

49
Q

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

A

Works automatically to ensure both AC buses are powered

50
Q

The DC electrical system is supplied by:

A
  • (3) NiCad batteries (24v DC)
  • (2) Engine driven DC Starter-generators (28v DC)
  • (2) Transformer Rectifier Units (28v DC)
  • (1) Auxiliary Power Unit generator (28v DC).
51
Q

The AC electrical system is supplied by:

A

• (2) Engine driven AC generators that provide 115 volt, three phase, variable AC power.

52
Q

Selecting the Standby Battery switch to STBY BATT (ON) directly connects

A

the Standby battery to the left Main DC bus, allowing a “one-way” power flow for battery charging ONLY.

53
Q

Selecting the Auxiliary Battery switch to AUX BATT (ON) directly connects

A

the Auxiliary battery to the left Main DC bus allowing a two-way power flow

54
Q

Selecting the Main Battery switch to MAIN BATT (ON) directly connects

A

the Main battery to the right Main DC bus allowing a two-way power flow.

55
Q

Battery temperature values are displayed in WHITE

A

Normal Range

56
Q

Battery temperature values are displayed in AMBER

A

Battery temp between 50-65°C

57
Q

Battery temperature values are displayed in RED

A

BATT TEMP above 65°C

58
Q

A Left Main Bus fault is indicated by the illumination of these caution lights:

A
  • DC Bus
  • Standby Battery
  • AUX Battery
  • # 1 GEN Annunciator
59
Q

A Right Main Bus fault is indicated by the illumination of these caution lights:

A
  • DC BUS
  • Main BATTERY
  • # 2 GEN Annunciator
60
Q

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

A

Main, Auxiliary

61
Q

True or False: If the battery master is in the OFF position, the other batteries can still be used to power the aircraft.

A

False

62
Q

True or False: 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

Q400 (31 decks)

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