B747 ELECTIC QUESTION EXAMPLE

B747 ELECTRIC QUESTION EXAMPLE

1. AIRCRAFT BATTERY AMPERAGE AND VOLTAGE? 24V, 34A

2. TR AMPERE? 75A

3. EXT POWER TR RATE? 20A

4. WHAT’S THE AMPERE OF BAT CHARGER? 40A

5. IF OPEN PHASE DETECTED WHICH ONE TRIPS? BTB TRIP

6. TR INPUTS? 115VAC, 3PHASE

7. MAX ALLOWED CSD TEMP RISE? 15 DEG

8. WHERE’S GND SERVICE RELAY? P14

9. WHERE’S BATT THERMOSTAT? UP IN ONE OF CELLS

10. HOW CAN CSD CONNECT? ON GND WITH ENG S/D

11. CSD OIL TEMP SHOWS? OIL LEAVING CSD

12. ENG S/D WHICH RELAY TRIP? GCB

13. WHICH CONDITION FOR FUELING? STBY SW MUST OFF, BATT ON

14. WHICH UNIT CONTROL SSB? BOTH CAN OPEN BUT CLOSING BY BPCU2 ONLY

15. APU MECH FAULTS WHAT HAPPEN? APB TRIP

16. APU ELEC FAILURE? GCR TRIP

17. HOW CAN CONNECT BTB? MAN OR AUTO

18. BAT BOOSTER OUTPUT? 23V

19. WHERE PMG AC VOLTAGE CONVERTED TO DC? INSIDE GEN OR GCU?

20. FOR MEASURING REACTIVE POWER?CURRENT FROM PHASE B, VOLT FROM PHASE A,C

21. WHEN BEARING FAILURE? DISCONNECT CSD

22. HOW CAN POWER THE GND HAND BUS? GND ONLY, EXT PWR CONNECTED

23. EXT POWER AND APU ARE CONNECTED WHAT’S PRIORITY? EXT (FOR HAND BUS)

24. SSB GREEN LIT IS ON MEANS? SSB OPEN

25. NORM SOURCE OF DC BUS? TR

26. RADIO BUS SW AND MASTER RADIO SW LOCATION? P5

27. WHERE ARE DC ISO SW’S? P4

28. NORM SOURCE OF AC ESS? AC4

29. CSD IS A? HYDROMECHANICAL

30. APU BAT CHARGER LOCATION? E8 IN AFT

31. ELCU CONTROL SWITCH SYS? GALLY

32. IF BOTH EXT POWER OR BOTH APU CONNECTED? SSB TRIP

33. OUTPUT POWER OF ENG’S? 60KVA

34. OUTPUT POWER OF APU? 90KVA

35. WHICH BUS POWERS F/O RADIO BUS? AC2

36. DIFF OF APU AND ENG GEN’S? APU HASN’T CSD

37. CSD SPEED? 8000RPM

38. WHICH ONE CONTROLS APU RPM? ETC

39. WHAT KIND OF WIRE USED IN A/C? ALUMINUM

40. CSD HAS CAPABILITY OF? UNDERDRIVE(NO OVERDRIVE)

41. HOW CAN READ GEN FAULTS? PUSH READ P/B ON ANN PNL

42. HOW ERASE FAULTS? READ AND ERASE AT THE SAME TIME

43. DC STBY NORM POWERED BY? DC ESS

44. WHICH BAT NEED FOR APU STARTING? BOTH BAT

45. MAN ON POS OF INV? FOR TEST

46. BAT BOOSTER USED FOR? VHF1, VOR1, G/S1

47. BAT BOOSTER LOCATION? UPPER EQUIP CENTER

48. INV LOCATION? UPPER EQUIP CENTER

49. BAT CHARGING MODES? PULSING, CONSTANT POTENCIAL, NORMAL

50. PULSING USED FOR? WHEN BAT IS FULLY CHARGED

51. FAULT IN SYNC BUS? LOAD LIT ON

52. GND HAND BUS CAN POWER BY? APU1 AND EXT1

53. WHEN BAT CHARGING HOT BAT BUS POWERED BY? BAT

54. TEMP FOR STOP BAT CHARGING? 58DEG

55. APU BAT CHARGER POWERED BY? GND SRVC BUS

56. IF CSD DISCONN WHICH ONE TRIP? GCB