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Dash 8 Q300/200 > Electrical > Flashcards

Electrical Flashcards

1
Q

During engine start, the DC generator should change over from the starter mode to generator mode at approximately when?

A

63% NH

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2
Q

If both DC generators are off-line, which bus tires are closed by DC bus tie logic?

A

Main to secondary bus ties.

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3
Q

A failure of a battery temperature display sensor will be indicated by what?

A

A single light segment at the 60° mark.

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4
Q

What occurs in the event of a single DC generator malfunction?

A

The associated main bus will be unaffected as the main bus tie automatically closes.

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5
Q

What will cause illumination of the left or right 26V AC caution light?

A

26V AC bus failure, transformer failure, 115 V AC bus failure.

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6
Q

What are the sources of DC power to the aircraft?

A

TRU’S, the main and Auxillary batteries, engine driven DC generators.

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7
Q

Upon initially detecting a fault, the BBPU will not open which bus ties?

A

Secondary bus tie.

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8
Q

The majority of aircraft electrical services are supplied with DC power at what voltage?

A

28 V

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9
Q

Where is the battery temperature monitor panel located?

A

On the overhead panel.

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10
Q

And overheating number 1DC generator will result in which of the following caution light illuminating?

A

1DCGENHot

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11
Q

Illumination of the #2DC GEN Caution Light Indicates The #2DC Generator is ?

A

Is not connected to the right main DC bus.

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12
Q

Selecting the battery master switch on connects the batteries to what?

A

The essential bus

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13
Q

Following a left TRU malfunction, how would the affected TRU be shut down?

A

Left TRU circuit breaker pulled

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14
Q

If the PRI INV caution light were to illuminate, and the Auxiliary inverter switch is in the right position, which 400 Hz AC bus is unpowered?

A

All buses are powered

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15
Q

Can the left main bus be powered by the auxiliary battery?

A

No.

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16
Q

The #2 DC Generator connects to the what?

A

Right main bus.

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17
Q

If only one TRU is online, which bus ties are closed by DC bus tie logic?

A

Secondary bus tie.

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18
Q

Stepdown transformers convert what?

A

115V AC @400Hz to 26V AC

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19
Q

Following an electrical failure, the batteries must always be able to supply what?

A

30 minutes of backup power to the essential buses.

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20
Q

The DC external power receptacle is located where ?

A

Left side of the aircraft nose.

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21
Q

On the ground, the maximum permitted DC generator load is displayed as what?

A

0.7

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22
Q

What is the consequence of an individual AC generator failing in flight?

A

No systems affected as a result of the GCU – controlled AC bus cross – tie function

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23
Q

Illumination of the main battery hot warning light indicates what?

A

The battery temperature is excessive.

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24
Q

Illumination of the AUX BAT caution light indicates what?

A

The auxiliary battery is not connected to the left main bus.

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25
Q

If both TRUs are off-line, and the #1 DC Generator Fails,WhichOfTheFollowingBusesRemainPowered?

A

Both main buses

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26
Q

What do AC generators produce and where are they mounted ?

A

115V variable frequency, Mounted on the propeller reduction gearbox.

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27
Q

The battery power bus may also be referred to as the what?

A

Hot battery bus.

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28
Q

Transformer rectifier unit TRU output is what?

A

28 V DC

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29
Q

What kind of electrical power does solid-state inverters give AC or DC ?

A

AC

30
Q

Can the left main bus be powered by the auxiliary battery?

A

No

31
Q

Where is the DC starter/ generator mounted and what is it driven by?

A

Mounted on the accessory gearbox, and driven from the high-pressure compressor gearing

32
Q

The right TRU caution light illuminating indicates what?

A

The right TRU is Disconnected from the right secondary bus

33
Q

What do the static inverters convert?

A

28V DC To 115V AC @400hz

34
Q

The right transformer rectifier unit power is the what?

A

Right secondary bus.

35
Q

What is the maximum load on each phase of the AC generators when the aircraft is on the ground with outside air temperature of 5°, as indicated on the overhead AC system panel?

A

1.00

36
Q

The engine driven AC generators output what?

A

115 V variable frequency AC

37
Q

What prevents the Auxiliary battery powering the left main bus?

A

A diode.

38
Q

What kind of services are connected to the battery power bus ?

A

Fire extinguisher discharge circuits, emergency fuel and hydraulic shut off valves, the passenger address system and selected lights.

39
Q

What are the TRUs powered by?

A

115 V AC From the AC generators

40
Q

How does the main battery power both the right main bus and left main bus?

A

By manually selecting the main bus ties switch

41
Q

Where does the APU generator connect to?

A

Right main bus

42
Q

Where is the AC external power receptacle located?

A

Right engine nacelle

43
Q

Which bus powers the Primary inverter, secondary inverter and Auxiliary inverter ?

A

The primary inverter is powered by the left essential bus, the secondary inverter is powered by the right essential bus and the auxiliary inverter is powered by the left main bus.

44
Q

What’s a GCU?

A

Generator control unit.

45
Q

How are the DC generators GCUs controlled?

A

Controlled by the GEN1 and GEN 2 switches on the DC Control Panel.

46
Q

To provide variable frequency AC power What kind of configurations does the aircraft need to be in?

A

The propellers need to be out of feather due to the AC generators being driven off the propeller reduction gearbox.

47
Q

Max current regulation DC GCU ?

A

300 A max

48
Q

How do you do a GCU reset?

A

Can be attempted by selecting the GEN 1 or GEN2 switch as appropriate to off then back on

49
Q

When you get a DC GEN HOT caution light does it automatically turn off?

A

No it must be manually turned off

50
Q

What’s a GCU?

A

Generator control unit.

51
Q

How are the DC generators GCUs controlled?

A

Controlled by the GEN1 and GEN 2 switches on the DC Control Panel.

52
Q

To provide variable frequency AC power What kind of configurations does the aircraft need to be in?

A

The propellers need to be out of feather due to the AC generators being driven off the propeller reduction gearbox.

53
Q

Max current regulation DC GCU ?

A

300 A max

54
Q

How do you do a GCU reset?

A

Can be attempted by selecting the GEN 1 or GEN2 switch as appropriate to off then back on

55
Q

When you get a DC GEN HOT caution light does it automatically turn off?

A

No it must be manually turned off

56
Q

What kind of batteries Q300 ?

A

24V 40ampere-hour nickel-Cadium x2

57
Q

How are the bus ties controlled?

A

DC logic relays.

58
Q

With only one source of DC power does the whole electrical system get powered?

A

No load shedding will occur for example, with the failure of both TRUs and one DC generator, DC logic closes the main bus tie to ensure that both main buses are powered but both secondary buses are lost

59
Q

What does the BBPU do first when it sensors a bus Failure?

A

Upon initial detection of a fault the BBPU immediately opens the main bus tie and both main to secondary bus ties, to ensure that a faulty bus is isolated from the rest of the electrical system.

60
Q

Which buses does the DC external power power?

A

Left and right main buses.

61
Q

Before selecting DC external power on what must you do?

A

The battery master, main battery and auxiliary battery switches must be selected on in that order

62
Q

At what over voltage condition will the external DC power disconnect.?

A

When input voltage at the receptacle exceeds 31.5 V.

63
Q

Starter generator Max loading on the ground and in-flight?

A

300 A maximum in flight with a load of 1.00 210 A on the ground with a load of .70

64
Q

Maximum loading on the TRU?

A

200 A at all times.

65
Q

Maximum loading for a battery?

A

100 A

66
Q

The GCU will automatically shut down the AC generator and remove it from the bus if output voltage exceeds what?

A

125 V

67
Q

Maximum load on the ground for the AC system up to 10° ?

A

1.0

68
Q

Maximum AC load on the ground above 10°C

A

0.33

69
Q

Maximum load AC in flight?

A

1.0

70
Q

Inverter maximum load?

A

3.5 A (1.00)

Dash 8 Q300/200 (74 decks)

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