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CRJ 700/900Electrical > CRJ 700/900 Electrical > Flashcards

CRJ 700/900 Electrical Flashcards

0
Q

The main aircraft generators supply power to how many AC buses:

A

4

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1
Q

What is the APU generator rated at?

A

115-volt AC, 400-Hz, 40 KVA up to 41,000 feet.

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2
Q

What is the 28VDC supplied by:

A

Transformer Rectifier Units (TRU)

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3
Q

The APU battery is:

A

24 volts DC, 43 ampere hour

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4
Q

The main battery is:

A

24 volts DC, 17 ampere hour

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5
Q

How many transformer Rectifier units supply DC buses

A

4

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6
Q

Cranking power for the APU is supplied by:

A

APU Battery

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7
Q

The main and APU batteries are kept in charge condition by battery chargers powered by:

A

Main battery charged by: AC BUS No.1

APU Battery charged by: AC Service BUS

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8
Q

The external AC power receptacle is located?

A

Forward right side of airplane

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9
Q

The Electrical system warnings and caution messages are normally displayed on the:

A

EICAS Primary page

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10
Q

Electrical system status and advisory messages are normally displayed on:

A

EICAS status page

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11
Q

The Integrated Drive Generator (IDG) provides a means do converting:

A

Variable engine speed to constant generator speed

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12
Q

The IDG may be disconnected from the gearbox by

A

Disconnect switches located in the cockpit

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13
Q

Once the IDG is disconnected it can be reconnected by

A

By maintenance on the ground with engine shut down

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14
Q

The IDG converts variable engine speed to what constant RPM

A

12,000 RPM

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15
Q

Fault protection for each generator is provided by

A

Generator control unit (GCU)

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16
Q

The power priority for allowing power to AC Bus 1 would be

A

Gen 1, APU, Gen 2, External AC

same side, inside, cross side outside

17
Q

IDG 2 normally powers

A

AC bus 2

Service bus

18
Q

115 VAC is supplied to the TRUs for DC static conversion and each TRU is rated at ___ amps

A

120 amps

19
Q

An ESS TRU failure message will be displayed on EICAS when

A

Output is less than 18 VDC

20
Q

In flight, the ADG auto deploy monitors the three main AC generators and the main AC buses for

A

Complete power failure

21
Q

When are the main and APU batteries charging

A

Battery master switch ON and AC bus 1 powered

Battery master switch ON and AC Service Bus powered

22
Q

Main batt and APU batt “OFF” caution message are displayed on EICAS when voltage is at or below

A

18 VDC

23
Q

An amber IDG fault light/caution light indicates

A

Low IDG oil pressure and/or high oil temp

24
Q

A Gen 1 overload caution messages on EICAS would indicate a load greater than

A

40 KVA

25
Q

An AUTO XFER fail light (amber) on the electrical panel indicates

A

GCU had detected a fault and taken associated Generator offline.

26
Q

An AC ESS XFER light (white) on the electrical panel indicates

A

AC ESS bus is not being powered by AC bus 1

27
Q

What are the generators rated at

A

40 KVA up to FL410

28
Q

Batteries supply DC electrical power to which buses

A

Main batt direct bus
APU batt direct bus
DC EMER bus

29
Q

How many circuit breaker panels are there and where are they located?

A

Four total. Two located in the flight compartment, one in the aft equipment bay and one in the forward unpressurized nose compartment.

30
Q

How many batteries store and provide a source of DC electrical power for normal and emergency operations?

A

Two nickel cadmium (nicad) batteries, one located in the aft equipment bay and one in the forward unpressurized nose compartment.

31
Q

How many AC generators are on the CRJ?

A
  1. Two engine driven integrated drive generators which provide AC power to the ACPC for normal operations and the APU generator for backup.
32
Q

Generator KVA Overload protection occurs at:

A

45 KVA for 5 minutes

60 KVA for 5 seconds

33
Q

Bus priority for AC Bus 1:

A

Gen 1
APU Generator
Gen 2
External Power

34
Q

Bus priority for AC Bus 2:

A

Gen 2
APU Generator
Gen 1
External Power

35
Q

The aircraft engine driven and APU generators are rated at?

A

40 KVA

36
Q

Which DC Bus ties have automatic protection

A

Main tie
Cross tie
ESS tie

37
Q

When the ADG supplies power to AC ESS Bus, where does the power also flow to?

A

From the AC ESS Bus, power moves to the ESS TRU 1 which powers DC ESS Bus and DC Battery buses.

38
Q

The ADG only supplies power to: (4 things)

A

AC ESS Bus
Hydraulic 3B pump
Slats/Flaps
Pitch trim.

39
Q

The ADG supplies AC power to:

A

3B hydraulic pump, ESS AC Bus, slats/flaps and pitch trim

40
Q

Items on the DC Emergency Bus ?

A
  • SOVs - hydraulic, fuel, bleed air
  • FIREX Squib
  • Refuel/Defuel panel and valves.
41
Q

ADG, IDGs, and APU Generator are all how many Volts ?

A

115 volts AC

CRJ 700/900Electrical (21 decks)

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