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United 737 Systems Validation Study Guide (26 July 2021) > Electrical > Flashcards

Electrical Flashcards

1
Q

The minimum battery voltage for APU start is____.

A

The minimum battery voltage for APU start is____.

23 volts

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2
Q

When a source of power is connected to a bus system, _____ occurs.

A

When a source of power is connected to a bus system, _____ occurs.

it automatically disconnects an existing source

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3
Q

What does a GRD POWER AVAILABLE light do?

A

What does a GRD POWER AVAILABLE light do?

provides flight deck indication that AC ground power is connected to the aircraft and meets aircraft power quality standards

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4
Q

If the BUS TRANS switch is in the AUTO position and the source powering the transfer bus is disconnected or fails, what does the source powering the opposite transfer bus through the BTBs do?

A

If the BUS TRANS switch is in the AUTO position and the source powering the transfer bus is disconnected or fails, what does the source powering the opposite transfer bus through the BTBs do?

automatically picks up the unpowered transfer bus

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5
Q

What do the three transformer rectifier (TR) units do?

A

What do the three transformer rectifier (TR) units do?

convert 115-volt AC to 28-volt DC

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6
Q

Inflight, when does an amber TR UNIT light illuminate?

A

Inflight, when does an amber TR UNIT light illuminate?

TR1 or TR2 and TR3 has failed

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7
Q

How long does a fully charged battery have sufficient capacity to provide electrical power for? (Single-Battery configuration)

A

How long does a fully charged battery have sufficient capacity to provide electrical power for? (Single-Battery configuration)

A minimum of 30 minutes

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8
Q

When does an amber BAT DISCHARGE light illuminate?

A

When does an amber BAT DISCHARGE light illuminate?

excessive battery discharge is detected

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9
Q

If one or more of the following buses are unpowered, __________, it is indicated by an illuminated STANDBY Power (PWR) OFF Light

A

If one or more of the following buses are unpowered, __________, it is indicated by an illuminated STANDBY Power (PWR) OFF Light

all answers are correct

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10
Q

In flight or on the ground, with the STANDBY POWER Switch in AUTO (guarded position) in with the loss of all AC power, the AC standby bus is powered by __________________ and the DC standby bus is powered by _____________.

A

In flight or on the ground, with the STANDBY POWER Switch in AUTO (guarded position) in with the loss of all AC power, the AC standby bus is powered by __________________ and the DC standby bus is powered by _____________.

The battery

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11
Q

The light on the overhead panel that illuminates if the APU is running and not supplying power to a bus, is the_____.

A

The light on the overhead panel that illuminates if the APU is running and not supplying power to a bus, is the_____.

APU GEN OFF BUS

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12
Q

On the ground and inflight, the APU generator can supply power to ____________.

A

On the ground and inflight, the APU generator can supply power to ____________.

both transfer busses

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13
Q

The electrical system is designed to ___________ during single generator operation.

A

The electrical system is designed to ___________ during single generator operation.

shed electrical loads incrementally

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14
Q

When ____ oil is sensed in the IDG, the amber DRIVE caution light is illuminated.

A

When ____ oil is sensed in the IDG, the amber DRIVE caution light is illuminated.

low

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15
Q

It _________ possible to reactivate the IDG in flight after the IDG disconnect switch is used to disconnect the IDG from the engine.

A

It _________ possible to reactivate the IDG in flight after the IDG disconnect switch is used to disconnect the IDG from the engine.

is not

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16
Q

Which of the following can cause IDG low oil pressure?

A

Which of the following can cause IDG low oil pressure?

all answers are correct

• IDG automatic disconnect due to high oil temperature
• IDG disconnected through the generator drive DISCONNECT switch

17
Q

An amber _______ light illuminates to indicate the DC system or standby system equipment has failed, while the aircraft is on the ground. This light is inhibited in flight.

A

An amber _______ light illuminates to indicate the DC system or standby system equipment has failed, while the aircraft is on the ground. This light is inhibited in flight.

ELEC

18
Q

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

Maintenance (MAINT) Test Switch onthe AC and DC Metering Panel is typically used by ________.

A

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

Maintenance (MAINT) Test Switch onthe AC and DC Metering Panel is typically used by ________.

maintenance

19
Q

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

On the B737-900ER, which switch can be used to remove power from the left and right recirculation fans, forward and aft door area heaters, lavatory water heaters, ECS fan, all 115V AC galley busses, 115V AC shaver outlets, logo light, and potable compressor?

A

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

On the B737-900ER, which switch can be used to remove power from the left and right recirculation fans, forward and aft door area heaters, lavatory water heaters, ECS fan, all 115V AC galley busses, 115V AC shaver outlets, logo light, and potable compressor?

CAB/UTIL Switch

20
Q

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

What light on the overhead panel illuminates if the transfer bus is not powered by the source selected by the related generator switch?

A

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

What light on the overhead panel illuminates if the transfer bus is not powered by the source selected by the related generator switch?

SOURCE OFF

21
Q

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

On the B737-900ER, which switch can be used to remove power from 115V AC audio entertainment equipment, 115V AC video entertainment equipment, 115V AC airphone equipment, and passenger seat electronic outlets?

A

(NOTE: This question is not in SV Study Guide but does appear in the B737 Electrical Quiz V4)

On the B737-900ER, which switch can be used to remove power from 115V AC audio entertainment equipment, 115V AC video entertainment equipment, 115V AC airphone equipment, and passenger seat electronic outlets?

IFE/PASS SEAT Switch

United 737 Systems Validation Study Guide (26 July 2021) (14 decks)

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