A320/321 Electrical System 100% Solution Revised 2023//2024

A320/321 ELECTRICAL SYSTEM 100% SOLUTION REVISED 2023//2024 1. In normal configuration, How is DC ESS BUS supplied? a. from TR1 b. from ESS TR c. from TR 2 d. from Bat 2 - ANSWER a. from TR1 2. What happens in case of total loss of main generators? a. the RAT is automatically extended and powers the yellow system which drives the emergency generator b. the RAT is automatically extended and powers the blue system which drives the emergency generators c. the RAT has to be manually extended d. the RAT extended and mechanically connected to the emergency generator - ANSWER b. the RAT is automatically extended and powers the blue system which drives the emergency generators 3. AC ESS Bus is normally supplied by? a. AC BUS 1 b. AC BUS 2 c. Emergency Generator d. Static Inverter - ANSWER a. AC BUS 1 4. DC BAT BUS can be supplied by: a. DC bus 1 or batteries b. DC bus 1, DC bus 2 or batteries c. DC bus 2 or batteries - ANSWER b. DC bus 1, DC bus 2 or batteries 5. AC BUS TIE contactors enable the electrical system: a. to be connected in a parallel b. to be supplied by any generator or external power c. to be supplied by APU GEN or EXT PWR only - ANSWER b. to be supplied by any generator or external power 6. What happens during the EMER GEN test? a. the ram air turbine (RAT) is extended b. if the blue system is pressurized, the emergency generator comes on line c. the green system is pressurized and the emergency generator comes on line supplied by hot bus 2 - ANSWER b. if the blue system is pressurized, the emergency generator comes on line 7. Normal minimum battery voltage before APU start is: a. 22 V b. 25.5 V c. 27.5 V d. no minimum - ANSWER b. 25.5 V 8. When disconnecting the IDG, the button should be pressed: a. for no more than 3 secs. b. for longer than 3 secs. c. until fault light goes out d. for no more than 5 secs. - ANSWER a. for no more than 3 secs 9. On the EMER ELEC PWR panel, a red FAULT light illuminates under the "RAT and EMER GEN" label. What does it mean? a. RAT is not extended b. emergency generator is not supplying when AC bus 1 and 2 are not powered (above 100 kts) or DC bat bus is not powered c. emergency generator is supplying but AC ESS bus is not powered d. emergency generator is not supplying when AC bus 1 and 2 are not powered - ANSWER d. emergency generator is not supplying when AC bus 1 and 2 are not powered 10. What happens when the GEN 1 LINE pb is set to OFF? a. AC BUS 1 and 2 are not powered and emergency generator is automatically connected b. AC BUS 1 is powered by the GEN 2 because the GEN 1 is deactivated c. AC BUS 1 is powered by the GEN 2 because the GEN 1 line contactor is opened d. AC BUS 1 is not powered because the GEN 1 line contactor is opened and transfer contactor is not closed. - ANSWER c. AC BUS 1 is powered by the GEN 2 because the GEN 1 line contactor is opened 11. In cold aircraft configuration (no AC and no DC supply), where the batteries voltage can be checked? a. on the ECAM ELEC page b. on the ELEC overhead panel c. there is no indication - ANSWER b. on the ELEC overhead panel 12. AC ESS BUS is normally supplied by: a. AC BUS 1 b. AC BUS 2 c. Static inventer - ANSWER a. AC BUS 1 13. IN flight, On Batteries Only, the AC ESS SHED BUS and the DC ESS SHED BUS are lost: a. yes b. no - ANSWER a. yes 14. The static inventer works: a. always b. when A/C is in flight and on batteries only c. when one main generators fails - ANSWER b. when A/C is in flight and on batteries only 15. On ground, what happens when the "RAT and EMER GEN MAN ON P/B" is pressed in: a. the RAT is extended b. the emergency generator is activated c . nothing - ANSWER a. the RAT is extended 16. The static inverter transforms the DC voltage from the battery bus into: a. single phase 115 V - 400 HZ AC current b. three phase 115/200 V - 400 HZ AC current - ANSWER a. single phase 115 V - 400 HZ AC current 17. In flight, in case of loss of all main generators, emergency generator not running, the static inverter supplies: a. APU and ENG start + AC ESS bus b. ENG start + AC ESS + AC ESS shed bus c. ENG start - ANSWER a. APU and ENG start + AC ESS bus 18. The external power has priority over the APU