A330 ATA 24 - ELECTRICAL POWER

What is the main source of supply for the AC ESS BUS in normal configuration?. APU generator. External power. AC BUS 1. AC BUS 2.

Which component automatically supplies the AC ESSential BUS if no other AC sources or EMER GEN are available?. STAT INV. GLC. APU generator. External power.

How is the DC BAT BUS normally supplied?. From DC BUS 1. From DC BUS 2. From AC BUS 1. From AC BUS 2.

What supplies power to the DC ESS BUS in normal conditions?. ESS TR. TR 1. TR 2. AC BUS 2.

What supplies power to the DC ESS BUS with the loss of AC BUS 1?. AC BUS 1. AC BUS 2. ESS TR. DC BUS 1.

Which batteries supply power to the aircraft BAT HOT BUSES?. BAT 1 and 2. APU BAT. DC BUS 1. DC BUS 2.

What does the APU GEN supply when it is available and the APU is started?. Left side. Right side. Both sides. Neither side.

When does the No Break Power Transfer (NBPT) function operate?. On ground only. In flight only. Both on ground and in flight. During engine shutdown only.

What does the NBPT function prevent on the aircraft electrical network?. Power transients. Voltage spikes. Overload. Short circuits.

How long does the start sequence of the EMER GEN (or CSM/G) take?. Approximately 7 to 10 seconds. Approximately 5 to 7 seconds. Approximately 10 to 15 seconds. Approximately 15 to 20 seconds.

What supplies the AC ESS BUS and the DC ESS BUS during the start sequence of the EMER GEN?. Aircraft batteries. APU. Engine generators. External power.

How long does the EMER GEN supply the AC and DC ESS buses?. Until the end of the flight. For 30 minutes. For 1 hour. Until it is manually turned off.

How are the DC ESS BUS and the AC ESS BUS supplied when batteries are the only power source in flight?. Via STAT INV. Via AC BUS 1. Via DC BUS 1. Via DC BAT BUS.

Which buses are shed to reduce the load on the aircraft batteries when they are the sole power source in flight?. AC ESS SHED and DC ESS SHED. AC MAIN BUS and DC MAIN BUS. DC BAT BUS and AC ESS BUS. DC ESS BUS and DC BUS 2.

What buses are supplied by the aircraft batteries when they are the only source of power on the ground?. DC BAT BUS and AC ESS BUS. DC MAIN BUS and AC ESS BUS. DC ESS BUS and DC BUS 2. DC BAT BUS and DC ESS BUS.

What units control, monitor, and protect the engine IDGs?. Generator Control Units (GCUs). Ground and Auxiliary Power Control Unit (GAPCU). Electrical Contactor Management Units (ECMUs). Constant Speed Motor/Generator GCU (CSM/G GCU).

Which unit serves as an interface for the GCUs BITE and the Central Maintenance System (CMS)?. Electrical Contactor Management Units (ECMUs). Constant Speed Motor/Generator GCU (CSM/G GCU). Battery Charge Limiter (BCL). Ground and Auxiliary Power Control Unit (GAPCU).

What is responsible for managing the power source priorities and enabling the reconfiguration of the main power supply sources?. Constant Speed Motor/Generator GCU (CSM/G GCU). Battery Charge Limiter (BCL). Electrical Contactor Management Units (ECMUs). Generator Control Units (GCUs).

which unit is responsible for monitoring the status of the circuit breakers (C/Bs)?. Circuit Breaker Monitoring Unit (CBMU). Circuit Breaker Monitoring Display Unit (CBMDU). Ground and Auxiliary Power Control Unit (GAPCU). Flight Warning Computer (FWC).

What can be controlled and monitored via the IDG P/B on the Electrical panel?. IDG disconnection. Generator disconnection. CSD monitoring. GEN frequency regulation.

What is the function of the Constant Speed Drive (CSD) within the IDG?. Converts variable input speed. Monitors GEN voltage. Generates constant output speed. Controls GEN frequency.

Which unit controls, monitors, and protects each IDG, including its GEN and CSD?. Generator Control Unit (GCU). Generator Line Contactor (GLC). Feeder Line. Generator Line Contactor (GLC).

What is the purpose of the 6-hole Current Transformer (CT) in the feeder line?. Grounding the neutral line. Monitoring and protection. Splitting phases into feeder cables. Connecting generator to AC BUSbar.

What are the sources that can provide AC auxiliary generation?. APU generator. APU generator, External Power Receptacles (EXT PWR A and B). GPU, APU generator. AGLC.

What does the AC emergency generation system do in case of loss of AC main buses?. Restores power supply to AC and DC ESSential network. Activates Ess TR,s. Initiates automatic engine shutdown. Starts the APU generator.

What is the function of the Electrical Contactor Management System (ECMS), and which units control its operations?. Control and manage electrical network contactors. Monitors Circuit Breakers. Manage engine performance. Control electrical network buses.

How many Transformer Rectifiers (TRs) are involved in the DC main and ESSential generation, and what is their function?. Four TRs; convert AC to DC. Two TRs; supply power to AC buses. Six TRs; regulate engine performance. Eight TRs; monitor flight control systems.

Which AC buses supply power to TR1 and TR2, and which DC buses do they respectively supply?. AC BUS 1 supplies TR1; supplies DC BUS 1. AC BUS 2 supplies TR1; supplies DC BUS 2. AC BUS 1 supplies TR2; supplies DC BUS 1. AC BUS 2 supplies TR2; supplies DC BUS 2.

How many batteries are installed on board, and what is the primary purpose of each battery?. Three batteries; 2 backup supply and APU starting. Two batteries; backup supply and engine starting. Four batteries; backup supply and avionics cooling. One battery; backup supply and Apu starting.