What is the minimum battery voltage for APU start? 19 volts 23 volts 28 volts.
Primary electrical power is provided by ______ engine driven integrated drive generators (IDGs). two three four.
What occurs when a source of power is connected to a bus system? it automatically disconnects an existing source it automatically accepts the most powerful source the sources are paralleled and then accepted.
ELEC6.60.4
The APU generator can supply power to ____________ on the ground and inflight. one transfer bus two transfer buses to 10,000 feet, above 10,000 feet only one transfer bus can be powered both transfer busses.
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.
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.
For single generator operation, the system is designed to ___________. shed electrical load incrementally shed electrically both generator buses all answers are correct.
The amber DRIVE caution light is illuminated when ____ oil is sensed in the IDG. high low all answers are correct.
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.
IDG low oil pressure can be caused by which of the following: IDG disconnected through the generator drive DISCONNECT switch IDG automatic disconnect due to high oil temperature all answers are correct.
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.
The three transformer rectifier (TR) units convert 115-volt AC to _______ DC. 28-volt 23-volt 12-volt.
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.
A fully charged battery has sufficient capacity to provide electrical power for a minimum for ________. (Single-Battery configuration) 30 minutes 45 minutes 60 minutes.
An amber BAT DISCHARGE light illuminates when _________. a thermal runaway is occurring excessive battery discharge is detected the battery has failed.
During normal operation the guarded Standby Power Switch will be in _____ and the battery switch will be _____. BAT; ON AUTO; ON AUTO; either OFF or ON.
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.
With the STANDBY POWER Switch in AUTO (guarded position) in flight or on the ground with the loss of all AC power, the AC standby bus is powered by __________________ and the DC standby bus is powered by _____________. battery through static inverter; battery AC transfer Bus 2; TR3 115V AC Main Bus 2; TR2.
Maintenance (MAINT) Test Switch on the AC and DC Metering Panel is typically used by ________. flight attendants maintenance pilots.
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.
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.
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 IFE/PASS SEAT Switch BUS TRAN Switch.
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.
With ground power available, moving the Ground (GRD) Power Switch to the ON position removed previously connected power from AC transfer busses connects ground power to AC transfer busses if power quality is correct all answers are correct.
What light on the overhead panel illuminates if the transfer bus is not being powered? TRANSFER BUS OFF DRIVE ELEC.
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 DRIVE ELEC.
What light on the overhead panel illuminates if the IDG is not supplying power to the related transfer bus? GEN OFF BUS DRIVE ELEC.
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.
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.
Which switch provides manual control of ground service busses enabling servicing of the aircraft using external power without activating AC transfer busses? GROUND SERVICE Switch on the FWD Attendant Panel CAB/UTL Switch on the Overhead Panel IFE/PASS SEAT Switch on the Overhead Panel.
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