Electrical Flashcards
What is the minimum battery voltage for APU start?
()19 volts
()23 volts
()28 volts
23 volts
Primary electrical power is provided by ______ engine driven integrated drive generators (IDGs).
()3
()2
()4
2
What occurs when a source of power is connected to a bus system?
()It automatically accepts the most powerful source
() It automatically disconnects an existing source
() the sources are paralleled and then accepted
it automatically disconnects an existing source
A GRD POWER AVAILABLE light provides flight deck indication that AC ground power is ____________________.
() connected to the aircraft and meets aircraft power quality standards
() connected to the aircraft and may or may not meet aircraft power quality standards
() is powering the main bus
connected to the aircraft and meets aircraft power quality standards
Which of the following will automatic load sensing shed first during single generator (engine generator) operations?
() Galleys and main bus on Transfer Bus 1
() In Flight Entertainment (IFE) busses
() Galleys and main bus on Transfer Bus 2
Galleys and main bus on Transfer Bus 2
The amber DRIVE caution light is illuminated when ____ oil is sensed in the IDG
() high
() low
() all answers are correct
Low
After the IDG disconnect switch is used to disconnect the IDG from the engine, it _________ possible to reactivate the IDG in flight.
()is
()is not
Is not
On the ground, an amber _______ light illuminates to indicate the DC system or standby system equipment has failed. This light is inhibited in flight.
() ELEC
() TR UNIT
() BAT DISCHARGE
ELEC
Inflight, an amber TR UNIT light illuminates _________.
() TR1 or TR2 and TR3 has failed
() TR1 or TR2 or TR3 has failed
() all TRs have failed
TR1 or TR2 and TR3 has failed
An amber BAT DISCHARGE light illuminates when _________.
() a thermal runaway is occurring
() excessive battery discharge is detected
() the battery has failed
excessive battery discharge is detected
An illuminated STANDBY Power (PWR) OFF Light indicates one or more of the following buses are unpowered.
() AC standby bus, DC standby bus
() battery bus
() all answers are correct
All answers are correct
AC standby bus, DC standby bus
battery bus
Maintenance (MAINT) Test Switch on the AC and DC Metering Panel is typically used by ________.
() flight attendants
() maintenance
() pilots
maintenance
What is the function of the DC Meters Selector?
() selects the AC source for the DC Voltmeter and the AC Ammeter indications
() selects the DC source for the DC Voltmeter and the DC Ammeter indications
() selects the Standby Battery static inverter AC Ammeter indications
selects the DC source for the DC Voltmeter and the DC Ammeter indications
What is the function of the AC Meters Selector?
() selects the AC source for the AC Voltmeter, AC Ammeter and frequency meter indications
() selects the DC source for the AC Voltmeter and the DC Ammeter indications
() selects the Standby Battery static inverter AC Ammeter indications
Selects the AC source for the AC Voltmeter, AC Ammeter and frequency meter indications
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?
() CAB/UTIL Switch
() IFE/PASS SEAT Switch
() BUS TRAN Switch
IFE/PASS SEAT Switch
What light on the overhead panel illuminates if the transfer bus is not being powered?
()Transfer bus off
()DRIVE
()ELEC
TRANSFER BUS OFF
What light on the overhead panel illuminates if the IDG is not supplying power to the related transfer bus?
()ELEC
()GEN OFF BUS
()DRIVE
GEN OFF BUS
On the B737-800, moving the Generator (GEN) Switch to ON, connects ___________ by disconnecting the previous power source and closing the generator circuit breaker.
() IDG to the DC Main Bus
() IDG to the AC Transfer Bus
() all answers are correct
IDG to the AC Transfer Bus
What light on the overhead panel illuminates if the APU is running and not supplying power to a bus?
() APU GEN OFF BUS
() DRIVE
() ELEC
APU GEN OFF BUS
Positioning the standby power switch to the BAT position
() all choices are correct
() overrides automatic switching
() places AC standby bus, DC standby bus and Battery Bus on battery power
All answers are correct
overrides automatic switching
places AC standby bus, DC standby bus and Battery Bus on battery power
The APU generator can supply power to ________ on the ground and inflight.
() both transfer busses
() one transfer bus
() 2 transfer busses to 10,000 feet, above 10,000 feet only one transfer bus can be powered.
both transfer busses
If the BUS TRANS switch is in the AUTO position and the source powering the transfer bus is disconnected or fails, the source powering the opposite transfer bus ______ through the BTBs.
() automatically picks up the unpowered transfer bus
() can be selected to power the unpowered transfer bus
() cannot power the unpowered transfer bus
Automatically picks up the unpowered transfer bus
For single generator operation, the system is designed to________.
() shed electrical load incrementally
() shed electrically both generator buses
() all answers are correct
shed electrical load incrementally
*galley and main bus shed first
The Amber drive caution light is illuminated when ____ oil is sensed in the IDG.
() Low
() High
() All answers are correct
Low
