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Prog 1 > Electrics > Flashcards

Electrics Flashcards

1
Q

Fuel Panel Switches - Larger ones are ____ smaller ones are ______

A

Fuel Panel Switches - Larger ones are AC smaller ones are DC

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2
Q

Power to the boost pumps is supplied from the MAIN AC BUS ___ for Pump ___ and ____ and from the MAIN AC BUS ___ for Pump ____ and ____.

A

Power to the boost pumps is supplied from the MAIN AC BUS A for Pump No.1 and No.3 and from the MAIN AC BUS B for Pump No.2 and No.4

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3
Q

Function of External power monitor relay:

A

Prevents power with improper phase, voltage or frequency to power the AC

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4
Q

Power source to MAIN AC BUS A and B are assured by:

A

Transfer Relay system

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5
Q

If you lose MON DC, you lose START DC…. to regain START DC, what can you do?

A

Select any engine on the starter or the emergency inverter.

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6
Q

If the Run around relay circuitry fails, the FLT ESS AC bus is powered by what:

A

Main AC BUS A

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7
Q

During APU GEN Only the following is automatically de-energized above 8K’

A

a. No.1A Hydraulic pump.
b. Empennage de-ice system.
c. Circuit de-energized by the load monitor control relay

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8
Q

When the yellow GEN light is illuminated on the horizontal panel

A

Indicates a primary gen drive bearing failure, aux bearing in use

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9
Q

The nose gear up and locked switch when up and lock will disable:

A

GOB and cabin warning horn.

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10
Q

If you lose main AC BUS B you lose which boost pumps and which hyd pumps

A

Boost pumps 2-4
1A and 2 hyd pumps

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11
Q

GEN 4 off light:

A

Indicates that the GEN is unable to power any bus

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12
Q

STBY ATT Indicator is powered by:

A

Flight ESS DC

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13
Q

If APU gen is the only one, how is the flt ess AC bus powered:

A

APU GEN trhough RAR relays.

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14
Q

What activates load shedding:

A

selecting prop or emp de-ice

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15
Q

Gen 4 and APU are the only available gens, which provides power

A

Gen 4 is the only power

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16
Q

TRUs are de-energized by

A

Pulling the CB

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17
Q

If Main AC A fails, MON AC bus is powered by any gen through_______

A

RAR relays

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18
Q

The Supp panel does not provide:

A

Overfrequency protection

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19
Q

Battery V & AmpH

A

24 volts, 31 amph

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20
Q

Gen 3 off light illuminates means:

A

Not powering bus B

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21
Q

The emergency inverter powers: what

A

TIT indicators (START ESS AC)

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22
Q

Purpose of load monitor circuit

A

Prevent exceeding load capacity of a single gen in flight

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23
Q

Ground air sensing circuit disables:

A

Jettison circuit on the ground

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24
Q

If TR1 and TR3 fails

A

Lose noting (1 and 2 à loose main and ext main DC)

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25
Q

Total of __ generators. Only __ Generators can power the AC Buses at anyone time. When Gen __ and __ are operating, Gen __ and ___ Gen are in Standby Mode.

A

Total of 4 generators. Only 2 Generators can power the AC Buses at anyone time. When Gen 2 and 3 are operating, Gen 4 and APU Gen are in Standby Mode.

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26
Q

Gen __ and ___ Gen cannot power the AC buses simultaneously, but rather __________

A

Gen 4 and APU Gen cannot power the AC buses simultaneously, but rather Only one at a time

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27
Q

There are __ AC buses. What are they called?

A

5 AC buses:
Flight Essential AC Bus
Main AC Bus A
Main AC Bus B
Mon Essential AC Bus
Start Essential AC Bus

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28
Q

There are __ DC buses. What are they called

A

7 DC Buses
Flight Essential DC Bus
Main DC Bus
Ext Main DC Bus
Mon Essential DC Bus
Start Essential DC Bus
APU Essential DC Bus
Ground Operation Bus (GOB) DC BUS

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29
Q

The most critical of the AC buses for flight would be the_________________

A

FLIGHT ESS AC BUS.

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30
Q

There are __ TRUs which convert ___ VAC to __ VDC.

A

There are 3 TRUs which convert 120 VAC to 28 VDC.

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31
Q

TRU 1 and 2 both power ______________ BUS.

A

TRU 1 and 2 both power MAIN DC BUS.

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32
Q

TRU 3 powers ______________ BUS.

A

TRU 3 powers MON ESS DC BUS.

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33
Q

Transformer rectifiers, convert ____ to _____

A

Transformer rectifiers, convert 120 VAC to 28 VDC

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34
Q

The voltage regulator section is designed to provide excitation to a generator and to maintain a pre-set voltage level of ______ VAC under all load conditions when the generator is on line (NORMAL RPM).

A

The voltage regulator section is designed to provide excitation to a generator and to maintain a pre-set voltage level of 117 (±2) VAC under all load conditions when the generator is on line (NORMAL RPM).

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35
Q

_____________ Powers TRU No.1 which supplies power to ______________BUS.

A

MAIN AC BUS A Powers TRU No.1 which supplies power to MAIN DC BUS.

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36
Q

________________ powers TRU No.2 which supplies power to the ___________________

A

MAIN AC BUS B powers TRU No.2 which supplies power to the MAIN DC BUS

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37
Q

________________ powers TRU No.3 which supplies power to the __________________

A

MON ESS AC BUS powers TRU No.3 which supplies power to the MON ESS DC BUS

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38
Q

List 4 things that the battery powers

A

FLT ESS DC BUS
GOB and APU ESS DC BUS when the nose gear is down and the APU in-flight arming switch is off
START ESS DC via Inverter Relay
START ESS AC through the Emergency Inverter

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39
Q

How is the battery Charged?

A

by the TRUs through the FLT ESS DC BUS and blocking diode # 2

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40
Q

Generator output is regulated at:

A

120 V (117 +/-2)

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41
Q

Where are the Flight Essential AC and the Flight Essential DC Buses located.

A

Forward electrical load centre

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42
Q

What actions must be taken if Engine 2, 3, or 4 RPM exceeds 109 % ?

A

THE RESPECTIVE GENERATOR SWITCH MUST BE SELECTED OFF

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43
Q

Name the 2 Main AC Buses ?

A

MAIN AC BUS A
MAIN AC BUS B

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44
Q

If battery power is not available, external power can be used. True or False ?

A

FALSE

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45
Q

The APU generator can supply power to operate:

A

Entire electrical system on the ground when external electrical power is not available

46
Q

What is the function of the Transformer Rectifiers ?

A

CONVERT AC POWER TO DC POWER

47
Q

What protection is not provided by the voltage regulator / supervisory panel

A

Overfrequency

48
Q

What does the “GEN” light on the horizontal annunciator panel indicate ?

A

THE GENERATOR IS BEING SUPPORTED BY THE AUX BEARING

49
Q

What is the purpose of the EMP DE-ICE MONITOR switch ?

A

TO ALLOW THE USE OF EMP DE-ICE DURING SINGLE GENERATOR (APU) OPS ABOVE 8000’

50
Q

What is the purpose of the EXTERNAL POWER MONITOR RELAY ?

A

ENSURES PROPER PHASE, VOLTAGE AND FREQUENCY IS AVAILABLE TO THE A/C

51
Q

What is the function of the EMERGENCY INVERTER ?

A

CONVERT DC POWER TO AC POWER TO POWER START ESS AC

52
Q

What is the purpose of the BUS MONITORING SWITCHES?

A

ALLOWS THE RESPECTIVE BUS TO TO BE ISOLATED FROM ANY POWER SOURCE (Normally ‘ON’)

53
Q

What is indicated by the GEN 4 “OFF” light illuminated ?

A

GEN 4 IS NOT CAPABLE OF POWERING ANY BUS

54
Q

The minimum voltage limits of the battery with the inverter test switch selected are:

A

Aircraft buses off : 22 volts, T.R. powered : 25 to 30 volts

55
Q

Main AC Bus A normally powered by Gen 2 - 4, APU , 3 backup

A

Main AC Bus A normally powered by Gen 2 - 4, APU , 3 backup

56
Q

Main AC Bus B normally powered by Gen 3 - 4, APU, 2 backup

A

Main AC Bus B normally powered by Gen 3 - 4, APU, 2 backup

57
Q

What is the normal power source for the Main DC Bus?

A

MAIN AC BUS A AND MAIN AC BUS B THROUGH TRANSFER RECTIFIERS NO. 1 AND NO. 2

58
Q

Extension Main DC Bus is powered by ______________

A

Extension Main DC Bus is powered by Main DC BUS

59
Q

Mon essential AC bus is normally powered by MAIN AC Bus A. If Bus A fails, Mon Ess AC bus can be powered by any available generator via the runaround relays with what priorities ?

A

gen light

60
Q

Engine Instrument Power Sources

A

Monkey Mon Ess AC
Shit Start essential AC
Tastes Tach Gen (AC)
Awful Bus A (AC)

61
Q

Oil indicator Power Sources

A

E Ext Main DC
I Inst. Bus (AC) 1 2 2 1
E Ext Main DC
I Inst Bus (AC) 1 2 2 1
I Inst Bus (AC) 1 2 2 1

62
Q

Power source: If it’s delicate/breakable (Screen or something) / Small Switch = ____

A

Power source: If it’s delicate/breakable (Screen or something) / Small Switch = DC

63
Q

Power Source: If it’s big, or think it drains a lot of power / Big Switch = ____

A

Power Source: If it’s big, or think it drains a lot of power / Big Switch = AC

64
Q

Transfer Relays allow ________________________ to power the Main ____ Buses.

A

Transfer Relays allow any operating generator to power the Main AC Buses.

65
Q

With only one engine driven generator operating above 8000 feet, when will the electrical system load monitor ?

A

WHEN PROP DE-ICE OR EMP DE-ICE IS SELECTED ON

66
Q

When operating with APU generator only above 8000 feet, what additional items are load monitored?

A

NO. 1A HYDRAULIC PUMP AND EMP DE-ICE

67
Q

When operating with APU generator only (single generator) above 8000 feet , you need to use:

A

emp de-ice

68
Q

Prior to selecting emp de-ice monitor switch to override, you need to reduce an equivalent load. Equivalent loads consist of what?

A

No.1 hyd pump (boost out)
3 Fuel Boost pumps
Cabin exhaust fan

69
Q

Runaround Relays allow any operating generator to power what buses?

A

THE ESSENTIAL BUSES

70
Q

While in flight or on the ground, can you enter the MELC with power on the Aircraft?

A

NEGATIVE

71
Q

What is/are the last Bus/Buses to lose power?

A

FLIGHT ESS AC AND FLIGHT ESS DC BUSES

72
Q

Where do the engine driven generators get cooling air ?

A

ENGINE OIL COOLER INTAKE

73
Q

Where is Transformer Rectifier 3 located ?

A

FELC

74
Q

What action is required if a TR overheat light illuminates ?

A

CONSULT THE AOI’s; PULL RESPECTIVE CB OUT

75
Q

What is the maximum airspeed and altitude for APU operation in flight ?

A

225 KTS & 20000 FEET

76
Q

What if you are APU single gen ops above 8000’, and you need to use the emp-de/ice ?

A

225 KTS
18,200’ ICAO Std day
(16,000 Mil-std hot day)

77
Q

Gen 2 OFF light indicates :

A

Gen # 2 is not powering Main AC Bus A

78
Q

The Voltage Regulation/Supervisory Panel performs the following functions: (x4)

A
  1. Voltage regulation & bus transfer control
  2. Under frequency protection (auto reset)
  3. Over voltage and under voltage protection (manual reset)
  4. Feeder fault protection (not resettable)
79
Q

Where are the Voltage regulation/Supervisory Panlels Located?

A

In the MELC

80
Q

when RPM exceeds ______ Over frequency protection is NOT provided, and the generator must be turned off.

A

109%

81
Q

TRUs supply ___ VDC at a rate of ____ amps each

A

TRUs supply 28 VDC at a rate of 200 amps each

82
Q

why is it that the illumination of the Ext Pwr Available light does not assure availability of AC power to the aircraft? (x4)

A

a. Nose gear uplock not properly positioned.
b. Battery not connected.
c. Gen #4 Run Around Relay feeder CB out.
d. Ext Pwr CB out

83
Q

True or False? A NEON External Pwr Available Light will only illuminate when external power is available to the aircraft?

A

False -a NEON External Pwr Available Light will illuminate simply when a cable is connected to the aircraft (regardless of whether or not power is actually available. A GREEN on light will illuminate when power is applied to the ACFT buses.

84
Q

Components on Flight Essential AC Bus (x4)

A

P Pitot Heat (Pilot)
I IFF Lobbing Switch
O Outflow Valve
I Instrument Panel Light

85
Q

Components on Flight Essential DC Bus (x10)

A

P Pitchlock Reset
I Inverter Relay
T Transponder
S Stby Attitude Indicator
B Bell (Command Bell)
U Utility Light
R (FDR/CVR)
G GOB
A Air Data Computer
V VHF/AM

86
Q

Mission related Components typically on= __________________

A

Mission related Components typically on= Main AC Bus A

87
Q

Icing Components typically on= _______________________

A

Icing Components typically on= Main AC Bus B

88
Q

Bulk of Electrical Supply to non-critical equipment are on what buses?

A

The Mains:
Main AC BUS A
Main AC Bus B
Main DC Bus
Ext Main DC Bus

89
Q

GEN 2,3 or 4(Horizontal AP) Light

A

Primary front bearing has failed. Secondary bearing is smaller thus a contact is made giving light. If accompanied by Uncorrectable GEN malfunction ESD (note unless a greater emerg does not apply). Good for 10 hrs with no Uncorrectable GEN malfunction.

90
Q

Mon ESS DC powers the ESS DC feeders 1, 2, 3, (SAM). Sam means: (x3)

A

S Start DC (feeder 3)
A armament bus (feeder 1)
M Mon essential DC bus (feeder 2)

91
Q

___ lies and ___ Dies = If it is powered by AC it will give a false indication, if it is powered by DC is it will just read Zero.

A

AC lies and DC Dies = If it is powered by AC it will give a false indication, if it is powered by DC is it will just read Zero.

92
Q

AC power supply

A

gen 2-4+ APU

93
Q

How are the gens cooled

A

oil cooler duct through mechanically operated valve

94
Q

Rating of the Generator

A

60KVA on the ground 980KVA Airborne, temporary peak of 120 V

95
Q

What is the purpose of the inverter battery test switch?

A

Run the inverter and power the start ess ac and check the battery voltage under load

96
Q

What is the purpose of the Transfer relay?

A

they allow any generator to power MAIN AC BUS A and MAIN AC BUS B

97
Q

What is the function of GEN 4 AUX Control Relay

A

Controls operation of Transfer relays 5 & 6

98
Q

What prevents the FLT ESS DC BUS from powering the MON ESS DC BUC?

A

Blocking Diode #2

99
Q

What three components can be used to power the GOB airborne?

A

1.Put the gear down, 2.Arm the APU Arming Switch, 3. Pull GOB CB

100
Q

How can the START ESS DC BUS be alternately powered?

A

by the – Flight Essential DC BUS – inverter battery switch to test, select any engine, and pull the power sensing CB

101
Q

What function does transfer relay #7 provide

A

Provides priority to Gen 4 over the APU?

102
Q

What normally powers the MON ESS AC BUS?

A

MAIN AC BUS A

103
Q

What normally powers the FLT ESS AC BUS and what is the priority?

A

GEN 2, 4, APU, 3, BUS A

104
Q

What is the START ESS DC BUS used to power?

A

TIT Indicators

105
Q

What powers the FWD LTG bus

A

MON ESS AC BUS

106
Q

What normally powers the STRT ESS DC BUS

A

MON ESS DC BUS through feeders

107
Q

What is the primary power source for the FLT ESS DC BUS (ACFT Powered)

A

MON ESS DC BUS through blocking diode 2

108
Q

How many scissor switches are there and where are they?

A

2, one on each main gear

109
Q

Which two systems are directly controlled by scissor switches

A

flight idle stop and jettison circuit

110
Q

What buses can be powered by the battery with no ground power applied

A

Start ess ac through emerg inverter
Start ess DC
GOB
APU Ess DC
Flight Ess DC

Prog 1 (7 decks)

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