B763 Electrical

What does the Generator Control OFF light mean?. Bus tie breaker open. Generator breaker is open. Respective AC bus not powered. Field breaker is open.

What does an illuminated Generator DRIVE light indicate?. Low oil temperature or high oil pressure. High oil temperature or high oil pressure. High oil temperature or low oil pressure. Low oil temperature or low oil pressure.

Once disconnected, an IDG can be reconnected in flight. True. True (an inflight shutdown and relight is required). True (by reducing N2 rpm below 50% for 10 seconds). False.

What is the difference between a generator failure and a bus failure?. There is no difference. With loss of a generator, its bus will be powered by an alternate source of power. With a bus failure (short circuit, etc), the bus is automatically isolated from all power sources and cannot be powered. Both (b) and (c) are correct.

The APU generator OFF light indicates: The APU generator breaker is open due to a fault, and the APU is running. The APU GEN control switch is OFF. Both (a) and (b) are correct. None of the Above.

Which of the following statements is NOT true of External Power?. The External Power ON light means that External Power is in use. If selected ON with both engines are running, External Power will always have priority. If a engine-driven generator is lost, External Power will automatically assume the load. None of the above.

Which busses are powered by the Left AC bus?. Centre AC. Standby AC. Centre AC and Standby AC. None of the above.

Which busses are normally powered by the Right AC?. Both Battery Chargers. Ground Service and Ground Handling Busses. Ground Service Bus, which in turn powers both Battery Chargers. Ground Handling Bus, which in turn powers both Battery Chargers.

What are the Bus Tie priorities?. APU, own generator, other generator. Own generator, other generator, APU. Own generator, APU, other generator.

The Bus Tie switches in AUTO: prevents paralleling if more than one power source is available. allows other power sources to take over in case of generator failure. Both (a) and (b) above. None of the above.

With the Bus Tie switch in AUTO, what causes the Bus Tie ISLN light to illuminate?. An open bus tie breaker. An open bus tie breaker due to a bus fault. A closed bus tie breaker. All of the above.

The DC Bus Tie will still close if either AC Bus Tie is not in AUTO. TRUE. FALSE.

DC busses are automatically inter-connected through the DC Bus Tie Breaker: if a Transformer RECTIFIER fails. if a DC bus fails. if an AC bus fails. during CAT III autoland approaches (multiple autopilots engaged).

What bus is the Utility Bus connected to when the utility bus switch is ON?. Respective main AC bus. Respective main DC bus. Respective Standby AC bus. Respective Standby DC bus.

If you lose a main AC bus, will only one utility bus be lost?. YES. NO.

Where does power for the Galley busses come from?. Utility busses. Ground Service Bus. Standby AC bus. Flight Handling Bus.

Is there any cockpit indication that the galley power is off? How do you get the galleys back?. Yes; they reset automatically. No; they reset automatically. Yes; cycle the utility bus switches. No; cycle the utility bus switches.

The Ground Service Bus can be powered by: External Power when on the ground. the APU when on the ground. the APU when in-flight. All of the above.

What does the Ground Service Bus power?. Emergency lights battery chargers. Both forward equipment cooling fans. Both (a) and (b) are correct. None of the above.

On the ground, if the Right AC Bus is not powered, what should be done to power the Ground Service Bus from the Ground Handling Bus?. Call for maintenance support. Use the Ground Service switch on the forward Flight Attendant panel. Use external power to power the aircraft. The Ground Service Bus cannot be powered in this situation.

What must be available for normal cargo door operation if the aircraft is dispatched with the APU generator INOP?. A pneumatic air cart. External power. External hydraulic power. Any of the above.

What can the Ground Handling Bus power?. Cargo doors and ground handling equipment. Cargo doors, ground handling equipment and cargo compartment lights. Cargo doors, ground handling equipment, cargo compartment lights and refuelling panel. Cargo doors, ground handling equipment, cargo compartment lights, refuelling panel and an aft equipment cooling/vent fan.

What is the purpose of the Centre AC Bus?. To ensure three separate power sources are available during autoland operations. As a backup in the event you lose one of the Main AC buses. To provide a way to separate the power on the Left and Right AC buses. None of the above.

During a CAT III approach with multiple autopilots engaged, the electrical system reverts back to normal when autopilots are disengaged or an autopilot go around is selected. TRUE. FALSE.

The Captains and First Officers Flight Instrument Transfer Busses are normally powered by. Left and Right AC. Centre and Right AC. Centre and Left AC.

A Flight Instrument Bus will NOT automatically transfer to the opposite Main AC Bus if its respective Bus Tie switch is NOT in AUTO. TRUE. FALSE.

What is required to enable the First Officers Instrument Transfer Bus to transfer with the loss of right main AC?. The Left Bus tie switch must be in AUTO. The Right Bus tie switch must be in AUTO. Both the Left and Right Bus Tie switches must be in AUTO. None of the above.

Having dispatched with the APU generator inoperative, you have been asked to accept remote holding and elect to do so with one engine shutdown (to save fuel). Whilst holding, the No.1/Purser/SCCM/Cabin Manager calls to say that some of the passenger reading lights and cabin ceiling lights are out. What is the cause?. A CB has popped. You forgot to parallel the generators. The Left Utility Bus load shed because you have pushed up both power levers.

What arms the load shed system to trip off both Utility Busses with the loss of a generator?. Either thrust lever in the takeoff range on the ground. Aircraft in flight or both thrust levers in the takeoff range on the ground. Single engine start. Double engine start.

The Main battery supplies the Hot Battery Bus directly. TRUE. FALSE.

During flight, the Battery Bus is normally powered by: the Left main DC bus. the Standby DC bus. the Hot Battery bus. None of the above.

The MAIN BAT DISCH light ON means: the Standby Power Selector is selected to BAT. the Battery is discharging. the Right AC bus is not powered. the external power has dropped off.

The Battery Bus and Standby DC are normally powered by the: Left DC Bus with the Battery as backup. Left DC Bus with the Right DC Bus as backup. Right DC Bus with the battery as backup. Centre DC Bus with the Right DC Bus as backup.

The Standby power OFF light means: the Standby AC bus is not powered. the Standby AC and DC busses are not powered. the Standby DC bus is not powered. None of the above.

With the Battery switch ON, what is powered if Standby Power Selector is selected to BAT?. Battery, Hot battery. Standby AC bus. Standby DC bus. All of the above.

With the Battery Switch ON and the Standby Power Selector at BAT, the Standby buses will be powered by: the Main Battery. the APU Battery. the Main and APU batteries. the Left AC and Left DC buses.

In case of a failure, With the Battery switch ON and the Standby Power selector in AUTO: the Battery will automatically power the Battery Bus. the Battery will automatically power the Standby Busses. Both (a) and (b) are correct. None of the above.

Which of the following statements is NOT true with respect to the Standby Power Selector Switch?. AUTO - automatic backup power source switching for battery bus & standby AC & DC busses. BAT - cuts main AC & DC from standby system, uses battery; battery charger off. OFF - cuts all power to main AC & DC busses. All of the above are correct.

What is the normal power source for the Left AC Transfer Bus on HDG-equipped aircraft?. HDG. Left Main AC Bus. Right Main AC Bus. Right AC Transfer Bus.

The HDG activates automatically with loss of both generators. Which busses does it power?. Hot battery and Battery busses. Standby AC and DC busses. Both AC Transfer busses. All of the above plus the Captains Flight Instrument Transfer Bus.

Following a Total AC failure,with only HDG power in use, what items are working?. All items on the instrument panel. Both Autopilots. Most items on the instrument panel from gear handle to the left except for the flight director, EICAS screens and autopilots. None of the above.

If one Main AC bus is inoperative (BUS OFF) on HDG aircraft, the associated: AC Transfer Bus remains operative, because it is powered by the opposite AC Transfer Bus. AC Transfer Bus remains operative, because its Main DC bus remains powered by its TRU. AC Transfer Bus is INOP, because the HDG does not start unless both Main AC busses are lost. Flight Instrument Transfer Bus is lost.

During triple channel approach , the Left Generator is lost at 140ft RA. Resulting in Left Main AC bus loss. TRUE. FALSE.

In flight the Left engine is shut down. What electrical buses are lost?. Both Utility Buses and the Left DC bus. Both Utility Buses. Only the respective Utility Bus. The Left DC Bus.

Describe the function of the ON position of the Engine Generator Switch. Closes generator field and arms generator breaker to close when proper generator output is available. Closes generator field. Closes generator breaker. None of the above.

When does the Utility bus OFF light illuminate?. Only when the switch is OFF. Whenever the bus is unpowered. Only when the switch is ON and the Bus is unpowered.

Which of the following will cause the Generator DRIVE light to illuminate?. High oil temperature. Clogged oil filter. High Generator load.

When will the Utility Buses be shed during an engine start?. Only when the APU is supplyig electrical and pneumatic power. Anytime the APU is supplying electrical power. When the APU or External power is supplying electrical power.

Pushing the Generator control switch OFF resets fault trip circuitry. TRUE. FALSE.

The HDG is operating while the gear is retracting. TRUE. FALSE.

Which is the power source of the Utility Bus?. Respective Main AC bus only. Respective Main AC or opposite Utility Bus only. Respective Main AC, Opposite Utility or AC Bus.

What is accomplished by pushing the AC Bus Tie switches to AUTO?. Opens the Bus tie breakers. Closes the Bus tie breakers. Arms the automatic operation of the AC and DC Bus Tie system.

In flight. Electrical system is in normal flight configuration. STBY power OFF light comes ON, EICAS advisory message appears. Which position of the STBY power selector will provide an alternate power source to the Standby buses?. BAT. AUTO. OFF.

Which has priority in supplying the Ground Handling Bus, the APU or External Power?. APU. External Power. Whichever is manually selected.

When is the Ground Service Bus powered?. Whenever the EXT PWR AVAIL light is ON. Whenever the RIGHT Main AC Bus is powered. Whenever the Ground Handling Bus is powered. Whenever the Left Main AC Bus is powered.

What does the STBY POWER OFF light indicate?. Either or both Standby Buses are unpowered. Only the Standby AC bus is unpowered. The STBY Selector is positioned to OFF. Only the Standby DC Bus is unpowered.

Which of the following inhibits the APU Generator control OFF light?. Either engine generator breaker being closed. External power contactor being closed. Either a generator breaker or external power contactor being closed.

Which of the following arms the Load Shed system to trip OFF both Utility Buses with the Loss of a Generator?. Both engine generator beakers closed. Both engine Generator Drive light extinguished. Airplane in flight.

Source order for powering L and R Main buses?. Respective IDG then opposite IDG. Respective IDG, APU generator, opposite IDG. No source order. Respective IDG, opposite IDG, APU generator.

Which bus is powered automatically when external power is plugged IN and AVAIL. Standby AC. Ground Service Bus. Ground Handling Bus.

Right DRIVE light comes ON, EICAS msg displayed. What is the cause?. The Right Generator Drive has been disconnected manually. The Right Generator Drive oil pressure is too low. Either the Right Generator Drive oil pressure is to low or the oil temperature is too high. The Right Generator Drive has disconnected automatically.

With the APU supplying Electrical power, what happens when the first engine is started?. Nothing. The engine powers both Main AC buses. The engine powers its respective Main AC bus only.

What can power the Ground Handling Bus?. Only external power or the APU. Only the APU. APU, external power or an engine generator.

The Standby buses can be powered from the Left Main AC and DC even with the Standby selector OFF. TRUE. FALSE.

Three Autopilots are armed for a triple channel approach. At 1200ft RA, the Left generator is lost. As a result, the Left Main AC bus is lost. TRUE. FALSE.

BUS OFF light is illuminated. What does it mean?. Bus Tie breaker is locked closed because switch is OFF (static inverter closed). Bus Tie breaker is locked closed because switch is OFF or Fault occurred. Static Inverter failed. Bus Tie breaker is locked open because switch is OFF or Fault ocurred.

What is required to enable Captain's flight instruments transfer bus to transfer with the loss of Left Main AC?. Only the RIGHT bus tie switch must be in AUTO. Only the LEFT bus tie switch must be in AUTO. Both LEFT and RIGHT bus tie switches must be in AUTO.

Pushing the Generator Control switch off opens the Generator field. TRUE. FALSE.

The OFF position of the Standby Power selector de-energizes the Battery Bus, Standby AC bus and Standby DC bus. TRUE. FALSE.

To Which Bus is the Utility Bus connected when the Utility Bus switch is ON?. Respective Main AC bus. External Power. Opposite Utility Bus.

With the Bus Tie switch in AUTO, what causes the AC Bus ISLN light to illuminate?. Bus fault has occurred. Closed Bus tie breaker. Open Bus tie breaker.

What is the highest automatic priority on the Left Main AC bus?. APU generator. Left engine driven generator. External power.

What bus powers the fire extinguishers?. Standby DC. Battery Bus. Hot Battery bus.

The Ground Handling Bus powers the battery chargers. TRUE. FALSE.

What does the Generator Control OFF light indicate?. Bus Tie breaker open. Respective AC bus not powered. Generator breaker open.

Left Main AC power is lost. What is the status of the Standby Buses?. Hot Battery Bus powers only Standby DC bus, leaving Standby AC Bus unpowered. RIGHT DC bus powers LEFT DC bus, Standby DC bus and Standby AC bus via static inverter. Hot Battery Bus powers only Standby AC bus, leaving the Standby DC bus unpowered. Hot Battery Bus powers from Standby buses.

What is closed by pushing the Genertor Control switch ON before engine start?. Generator field only. Both field and generator field. Generator breaker only.

A Generator DRIVE light can indicate low oil pressure. TRUE. FALSE.

What is the normal source of power for the Standby AC bus?. Left Main AC bus. Left AC Transfer bus. Left DC bus. Main battery.

How many sources of AC power the 767 has?. 5. 4. 3.

When Electric power fails, what happens to the cockpit door lock?. It remains in the previous position. It locks automatically. It can be opened from the cockpit, but not from the cabin. It unlocks automatically.

What causes the Standby power bus OFF light to illuminate?. Battery charger failure. Loss of Left system power to Standby buses. Loss of power on either the Standby AC or DC bus.

Bus Tie system parallels engine generators but prevents any other sources from being paralleled. TRUE. FALSE.

The Ground Service Bus powers: 2 battery chargers ( main + apu), equipment cooling fan, Left forward pump and main entry door. 3 battery chargers, equipment cooling fan, Left forward pump and main entry door. 2 battery chargers ( main + apu), equipment cooling fan, Left forward pump, main entry door and passenger lights. 2 battery chargers ( main + apu), equipment cooling fan, Left forward pump.

When can the Ground Handling Bus be powered?. Only when the APU is running. On the ground. Either on the ground or in flight.

What Bus powers most of the airplane's Fire Detection system?. Battery bus. Hot Battery bus. Standby DC bus.

Battery power is available for. 30 minutes. 60 minutes. 30 minutes (90 minutes in those airplanes were the batteries of APU and Main are paralleled).

External power receptacle is located aft the nose wheel well. TRUE. FALSE.

Two AC generators are sufficient to power all aircaft systems. TRUE. FALSE.

The Main Cargo Door is powered by. L Main AC Bus. Ground Service Bus. Ground Handling Bus. L Hyd system.

Connect the item with the power source. BATTERY BUS. HOT BATTERY BUS.