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ATR Electrics > Electrical > Flashcards

Electrical Flashcards

1
Q

THE DC GND HDLG XFR BUS CAN BE POWERED BY:

A

HOT MAIN BAT

EXTERNAL POWER

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2
Q

BAT SWITCH SELECTOR OFF, NO ENGINE RUNNING MEANS:

A

DC ESS BUS, DC STBY BUS, INV1 AND AC STBY BUS ARE ISOLATED FROM THE HOT MAIN
BAT BUS

DC EMER BUS IS ISOLATED FROM THE HOT EMER BAT BUS

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3
Q

NO EXTERNAL POWER, NO ENGINE RUNNING, AND BAT SW OFF, WHICH ITEMS DOES THE
DC GND HDLG XFER BUS POWER?

A

REFUEL AND DEFUEL SYSTEMS, CARGO DOOR AND COCKPIT/CABIN ENTRANCE LIGHTING
(2 MINUTES WHEN SELECTED WITH THE MAIN DOOR OPEN)

THE DC AUXILIARY HYDRAULIC PUMP, VIA PEDESTAL PB

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4
Q

“BAT SW” SELECTED ON, NO ENGINE RUNNING, ALLOWS:

A

EXT PWR OPERATION OR A REDUCED DC SUPPLY FOR QUICK PRELIMINARY COCKPIT
PREPARATION IN ORDER TO START THE RIGHT ENGINE IN HOTEL MODE

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5
Q

THE NORMAL VOLTAGE READING FOR A BATTERY IS:

A

FOR A BATTERY WITHOUT LOAD 25-28 VOLT

FOR A BATTERY UNDER LOAD 23-28 VOLT

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6
Q

WHAT ARE THE CAPACITIES OF THE BATTERIES?

A

MAIN BAT 24 V/ 43 AH, EMER BAT 24 V/ 17 AH

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7
Q

A/C ON GROUND “EXT PWR” LIGHT “AVAIL” ILLUMINATED, TO POWER THE DC
DISTRIBUTION SYSTEM YOU MUST:

A

PLACE BAT SW SELECTOR ON AND PRESS THE EXT PWR PB

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8
Q

THE DC SVCE BUS CAN BE POWERED BY

A

DC EXT PWR, ONLY THE DC SVCE PB ON THE CABIN ATTENDANT PANEL HAS CONTROL
EVEN WITH BAT SW OFF

DC BUS 1 IF THE DC SVCE/UTLY BUS PBS IN THE COCKPIT AND THE CABIN ATTENDANT
PANEL ARE ON

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9
Q

HOW MANY BUS TIE CONTACTORS (BTC) AND BUS TIE RELAY (BTR) ARE CONTROLLED BY THE
MAIN ELEC PWR PANEL “BTC” PB?

A

TWO, ONE BETWEEN DC BUS 1 AND DC BUS 2; ONE BETWEEN AC BUS 1 AND AC BUS 2

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10
Q

A/C ON GROUND, DC EXT PWR ON, DC BTC “ISOL”;

A

DC BUS 2 AND AC BUS 2 ARE SUPPLIED FROM EXT PWR

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11
Q

WHEN DC GENERATOR IS FUNCTIONING AS A STARTER DURING A BATTERY STA

A

IT IS ELECTRICALLY SUPPLIED BY THE HOT MAIN BAT BUS AND CONTROLLED FROM THE DC ESS

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12
Q

WHAT IS THE FUNCTION OF THE EMER BAT WHILE THE ENG START ROTARY SELECTOR IS SET
TO START OR CRANK?

A

IT PROVIDES POSITIVE POWER TO PROTECT CRITICAL ITEMS FROM POWER TRANSIENT.
IT NEVER POWERS THE STARTERS

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13
Q

ONCE THE STARTER GENERATOR HAS STARTED THE ENGINE, IT OPERATES IN THE
GENERATOR MODE WHEN PASSING:

A

NH 61.5%

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14
Q

WHAT IS THE NORMAL VOLTAGE OF THE DC GENERATORS?

A

28 VOLTS

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15
Q

A/C ON GROUND, ENGINES RUNNING, DC EXT PWR AVAILABLE AND ON LINE:

A

DC EXT PWR HAS PRIORITY OVER ENG DC GEN

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16
Q

ASSUMING NORMAL OPERATION IN FLIGHT, HOW IS THE CONSTANT AC PWR FREQUENCY
OBTAINED:

A

FROM DC BUSSES THROUGH TWO INVERTERS

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17
Q

ASSUMING NORMAL OPERATION IN FLIGHT, WHEN ARE THE HOT EMER BUS AND HOT MAIN
BAT BUS CONNECTED TO THEIR RESPECTIVE BATTERIES:

A

ALWAYS

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18
Q

ASSUMING NORMAL OPERATION IN FLIGHT, WHEN ARE THE DC EMER BUS AND DC ESS BUS
CONNECTED TO THE DC BUS 1 AND/OR DC BUS 2:

A

ALWAYS THROUGH BAT CHG AND ITS RESPECTIVE HOT EMER OR HOT MAIN BAT BUS

19
Q

INVERTER 1 NORMALLY SUPPLIES:

A

AC BUS 1 AND AC STBY BUS

20
Q

DC SVCE AND UTILITY BUS SHED AMBER LIGHT COMES ON WHEN:

A

AT LEAST ONE UTILITY BUS IS DISCONNECTED FROM ASSOCIATED MAIN DC BUS

21
Q

THE “EMER BAT CHG” FAULT LIGHT COMES ON WHEN:

A

BATTERY OVERHEAT, DETECTED BY MFC (AUTOMATIC DISCONNECTION)

A FAILURE OF THE CHARGE CONTACTOR

22
Q

FOLLOWING AN INVERTER FAILURE, “INV” LIGHT ILLUMINATED:

A

ASSOCIATED AC BUS IS SUPPLIED THROUGH THE AC BTR BY THE OTHER INVERTER

23
Q

IN CASE OF MAIN BAT OVHT WITH MAIN BAT CHG FAULT LIGHT ON, WHAT HAPPENS TO THE
BUSSES POWERED BY THAT BATTERY?

A

THE HOT MAIN BAT BUS IS LOST AND DC ESS BAT BUS IS POWERED BY DC BUS 1

24
Q

IN FLIGHT WITH ONE ENGINE OPERATING, WHICH INDICATION WOULD BE DISPLAYED ON
THE SHUTDOWN ENGINE’S DC GEN PB:

A

WHITE OFF IF PB IS RELEASED

AMBER FAULT IF PB IS DEPRESSED (IN)

25
Q

ENGINE RESTART WITH THE DC GEN PB IN (DEPRESSED) WHAT SHOULD HAPPEN TO THE PB
LIGHT WHEN THE GENERATOR COMES UP TO NORMAL OPERATING SPEED:

A

GEN FAULT AMBER LIGHT SHOULD GO OUT

26
Q

IN FLIGHT ONE ARROW ILLUMINATED ON THE EMERGENCY SUPPLY SHOWS:

A

THE SUPPLY OF DC ESS OR DC EMER BUS FROM THE CORRESPONDING HOT BATTERY
BUS AND BATTERY DISCHARGING

27
Q

THE “DC BTC” IS AUTOMATICALLY CLOSED AND THE FLOW BAR IS ILLUMINATED IN CASE OF:

A

EXT PWR OPERATION, HOTEL MODE OPERATION, OR SINGLE ENGINE OPERATION

28
Q

IN THE EVENT OF BOTH DC BUS 1 AND DC BUS 2 SUPPLY LOST:

A

INV 1 IS AUTOMATICALLY SUPPLIED BY THE HOT MAIN BAT BUS OR BY THE HOT EMER
BAT BUS IN OVRD CONFIGURATION (OR BY TRU IF EQUIPPED AND SELECTED ON)

29
Q

NOT COUNTING UTILITY AND SERVICE BUSSES, WHICH DC/AC BUSSES CANNOT BE SUPPLIED
WHEN ON BATTERIES ONLY?

A

DC1 – DC2 – AC1 – AC2

30
Q

FOR THE TRU (TRANSFORMER RECTIFIER UNIT) IN CASE OF DUAL DC GEN LOSS:

A

WITH TRU PB ON, THE ACW BUS 2 IS CONNECTED TO DC EMER BUS, DC STBY BUS, INV 1

(AC STBY BUS ONLY)

31
Q

WITH BATTERIES ONLY, AC BUS 1 AND AC BUS 2 ARE:

A

Never supplied

32
Q

“ BAT” SELECTOR TOGGLE “SW” ON “OVRD” MEANS THAT:

A

NO CHANGING ABOUT THE SUPPLY, EACH EMER, ESS AND STBY BUS ARE FORCED TO BE
CONNECTED TO THEIR RESPECTIVE BATTERIES, OVERRIDING ALL OTHER LOGICS AND PROTECTIONS

33
Q

THE UNDV LIGHT ILLUMINATES AMBER WHEN:

A

DC STBY BUS VOLTAGE IS LOWER THAN 19.5 VOLTS

34
Q

STBY BUS OVRD PB SET ON OVRD MEANS THAT:

A

DC STBY BUS AND AC STBY BUS THROUGH INV 1 ARE SUPPLIED FROM DC HOT EMER
BUS

35
Q

NO EXT PWR AVAILABLE, DOES OPERATING IN HOTEL MODE PROVIDE POWER FOR THE ACW
SYSTEM:

A

No

36
Q

HOW CAN THE ACW SVCE BUS BE POWERED BY ACW EXT PWR:

A

DIRECTLY FROM ACW EXT PWR, GREEN AVAIL LIGHT ILLUMINATED, BUT THE
ATTENDANT PANEL ACW SVCE BUS SWITCH MUST BE ON (LIGHT ILLUMINATED)

37
Q

WHAT IS THE MINIMUM NP (PROP SEED ROTATION) TO ENSURE ACW GEN OPERATION?

A

70% (RANGE OF 341 TO 488 HZ)

38
Q

A/C ON GROUND AND ACW EXT PWR SELECTED ON, STARTING LH ENGINE AND PUTTING LH
CL MAX RPM:

A

ACW BUS 1 AND ACW BUS 2 ARE STILL SUPPLIED BY ACW EXT PWR

39
Q

IN THE ACW SYSTEM, HOW MANY BTCs (BUS TIE CONTACTORS) ARE USED:

A

TWO BTC AND ONE BTC PB

40
Q

THE BUS TIE CONTACTOR (BTC) IN THE ACW ELECTRICAL SYSTEM PERMITS:

A

IF ONE ACW GEN FAILS THE OTHER PROVIDES POWER TO BOTH ACW BUSSES

TO PROVIDE POWER TO BOTH ACW BUSSES WHEN EXT PWR IS USED

41
Q

A/C ON GROUND, ENGINES RUNNING, EXT ACW PWR SUPPLYING THE BUSSES, WE SELECT
ACW BTC ON ISOL:

A

ACW BUS 1 AND 2 ARE LOST

42
Q

WITH ALL 4 AIRCRAFT GENERATORS PB IN (DEPRESSED), AND EXT PWR SUPPLYING BOTH ACW AND DC, WHICH LIGHT SHOULD BE ILLUMINATED IN THE FOUR SHIP’S GENERATOR PB:

A

AMBER FAULT, TO SHOW AN OPENING GENERATOR CONTACTOR

43
Q

A/C IN FLIGHT, ACW GEN 1 FAILS:

A

ACW SVCE BUS ONLY IS SHED

44
Q

WHEN THE ACW SVCE BUS IS SHED, WHAT INDICATION(S) IS/ARE GIVEN:

A

SHED AMBER LIGHT ON ATTENDANT PANEL ACW SVCE BUS PB

ATR Electrics (1 decks)

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