Electrical

Question 1

When a source of power is connected to a bus system, _____ occurs.
A. it automatically accepts the most powerful source
B. the sources are paralleled and then accepted
C. it automatically disconnects an existing source

Answer 1

C. it automatically disconnects an existing source

Question 2

When ____ oil is sensed in the IDG, the amber DRIVE caution light is illuminated.
A. high
B. low
C. all answers are correct

Answer 2

B. low

Question 3

When does an amber BAT DISCHARGE light illuminate?
A. the battery has failed
B. a thermal runaway is occurring
C. excessive battery discharge is detected

Answer 3

C. excessive battery discharge is detected

Question 4

Which of the following can cause IDG low oil pressure?
A. IDG automatic disconnect due to high oil temperature
B. IDG disconnected through the generator drive DISCONNECT switch
C. all answers are correct

Answer 4

C. all answers are correct

Question 5

In flight or on the ground, with the STANDBY POWER Switch in AUTO (guarded position) and with the loss of all AC power, the AC standby bus is powered by__________ and the DC standby bus is powered by _________.
A. ?/DRIVE
B. ?/ELEC
C. ?/The battery

Answer 5

C. ? / The battery

Question 6

The ______switch provides manual control of ground service busses enabling servicing of the aircraft using external power without activating AC transfer busses.
A. CAB/UTL Switch on the Overhead Panel
B. IFE/PASS SEAT Switch on the Overhead Panel
C. GROUND SERVICE Switch on the FWD Attendant Panel

Answer 6

C. GROUND SERVICE Switch on the FWD Attendant Panel

Question 7

How long does a fully charged battery have sufficient capacity to provide electrical power for? (Single Battery configuration)
A. A minimum of 30 minutes
B. A minimum of 45 minutes
C. A minimum of 60 minutes

Answer 7

A. A minimum of 30 minutes

Question 8

The guarded Standby Power Switch will be in _____ and the battery switch will be _____, during normal operations.
A. AUTO; ON
B. BAT; ON
C. AUTO; either OFF or ON

Answer 8

A. AUTO; ON

Question 9

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. can be selected to power the unpowered transfer bus
B. automatically picks up the unpowered transfer bus
C. cannot power the unpowered transfer bus

Answer 9

B. automatically picks up the unpowered transfer bus

Question 10

The light on the overhead panel that illuminates if the APU is running and not supplying power to a bus, is the_____.
A. DRIVE
B. APU GEN OFF BUS
C. ELEC

Answer 10

B. APU GEN OFF BUS

Question 11

If one or more of the following buses are unpowered, __________, it is indicated by an illuminated STANDBY Power (PWR) OFF Light
A. AC standby bus, DC standby bus
B. battery bus
C. all answers are correct

Answer 11

C. all answers are correct

Question 12

What does a GRD POWER AVAILABLE light do?
A. provides flight deck indication that AC ground power is is powering the main bus
B. provides flight deck indication that AC ground power is connected to the aircraft and may or may not meet aircraft power quality standards
C. provides flight deck indication that AC ground power is connected to the aircraft and meets aircraft power quality standards

Answer 12

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

Question 13

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. ELEC
B. TR UNIT
C. BAT DISCHARGE

Answer 13

A. ELEC

Question 14

The system is designed to ___________ on single generator operation.
A. shed electrically both generator buses
B. shed electrical load incrementally
C. all answers are correct

Answer 14

B. shed electrical load incrementally

Question 15

How many engine driven integrated drive generators (IDGs) are used to provide primary electrical power?
A. two
B. three
C. four

Answer 15

A. two

Question 16

On the ground and inflight, the APU generator can supply power to ____________.
A. one transfer bus
B. two transfer buses to 10,000 feet, above 10,000 feet only one transfer bus can be powered
C. both transfer busses

Answer 16

C. both transfer busses

Question 17

The minimum battery voltage for APU start is____.
A. 19 volts
B. 23 volts
C. 28 volts

Answer 17

B. 23 volts

Question 18

What does a GRD POWER AVAILABLE light do?
A. Provides flight deck indication that AC ground power is powering the main bus
B. provides flight deck indication that AC ground power is connected to the aircraft and meets aircraft power quality standards
C. provides flight deck indication that AC ground power is connected to the aircraft and may or may not meet aircraft power quality standards

Answer 18

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

Question 19

Inflight, when does an amber TR UNIT light illuminate?
A. TR1 or TR2 or TR3 has failed
B. TR1 or TR2 and TR3 has failed
C. all TRs have failed

Answer 19

B. TR1 or TR2 and TR3 has failed

Question 20

It _________ possible to reactivate the IDG in flight after the IDG disconnect switch is used to disconnect the IDG from the engine.
A. is not
B. is

Answer 20

A. is not

Question 21

What do the three transformer rectifier (TR) units do?
A. convert 115-volt AC to 12-volt DC
B. convert 115-volt AC to 23-volt DC
C. convert 115-volt AC to 28-volt DC

Answer 21

C. convert 115-volt AC to 28-volt DC

Question 22

On the B737-800, when moving the Generator (GEN) Switch to ON, the ______are connected by disconnecting the previous power source and closing the generator circuit breaker.
A. IDG to the AC Transfer Bus
B. IDG to the DC Main Bus
C. all answers are correct

Answer 22

A. IDG to the AC Transfer Bus