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CL-65 Study Guide > Electrical > Flashcards

Electrical Flashcards

0
Q

Location of the main battery?

A

Nose compartment

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1
Q

Location of the APU battery?

A

Aft equipment bay

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2
Q

Max engine generator load?

A

40 KVA

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3
Q

Max APU generator load?

A

40 KVA

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4
Q

Max Transformer Rectifier Unit (TRU) load?

A

120 amps

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5
Q

Max permissible time for ground operations with battery power only?

A

5 minutes

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6
Q

What is the reason for the previous limitation?

A

To prevent ED1 and ED2 from overheating (Fans are AC powered)

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7
Q

How many TRUs are installed in the CRJ-900?

A

4

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8
Q

Where are the TRUs located?

A

Nose compartment

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9
Q

The main battery is rated to?

A

17 ampere hour, 24 volts

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10
Q

APU battery is rated to?

A

43 ampere, 24 volt

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11
Q

How many generators are installed?

A

4; 2 engine generators, 1 APU generator, 1 ADG

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12
Q

What is the function of the 4 TRUs?

A

To convert 115 volt AC to 28 volt DC

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13
Q

How are the TRUs cooled?

A

Individual fans

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14
Q

Which buses are powered when the Battery Master switch is selected on?

A

Main battery direct bus
APU battery direct bus
DC battery bus

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15
Q

If the main buses are powered, are the essential buses automatically powered?

A

Yes

16
Q

Is there an on/off switch for the TRUs?

A

No, they are automatically powered when the AC buses are powered

17
Q

What controls the DC tie contacters?

A

The DC Power Centers (DCPC) automatically control DC tie operation

18
Q

When will the Air Driven Generator (ADG) automatically deploy?

A

With complete loss of A/C power

19
Q

With the ADG deployed, what are the basic items that are powered?

A

AC ESS Bus
Hydraulic pump 3B (regardless of switch position)
Flaps/slats
STAB trim CH 2

20
Q

What is the ADG max load?

A

15 KVA

21
Q

The Main aircraft generators supply power to __ AC Buses

A

4

22
Q

Power for 28 VDC is supplied by…

A

Transformer Rectifier Units (TRU’s)

23
Q

Cranking power for starting the APU is provided by:

A

APU Battery

24
Q

The Main and APU batteries are kept in charged condition by battery chargers powered by:

A

AC BUS No. 1 and AC Service Bus

25
Q

The external AC power receptacle is located

A

Forward right side of the the airplane

26
Q

Electrical systems warning and caution messages are normally displayed on:

A

EICAS Primary Page

27
Q

Electrical system status and advisory messages are normally displayed on:

A

EICAS Status Page

28
Q

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

A

Variable engine speed to constant generator speed

29
Q

The IDG’s may be disconnected from the gearbox by:

A

Disconnect switches located in the cockpit

30
Q

Once disconnected, the IDG…

A

Can only be manually re-connected on the ground with the engine shut-down by Maintenance

31
Q

The IDGs convert variable engine speed to a constant generator speed of:

A

12,000 RPM

32
Q

Fault protection for each generator is incorporated in each:

A

(GCU) Generator Control Unit

33
Q

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

A

IDG 1, APU, IDG 2, External AC

34
Q

IDG 2 normally powers

A

Ac Bus 2 and the Service Bus

35
Q

Main Tie, Cross Tie, and ESS Tie Contactors

A

Are controlled automatically by the Direct Control Power Center (DCPC)

36
Q

An Amber IDG fault light/caution light indicates

A

Low oil pressure and/or High Oil Temp within the IDG

37
Q

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

A

Generator over current or a bus fault

38
Q

An AC ESS XFER switch light on the Electrical panel indicates

A

AC Essential Bus is not being powered by AC Bus 1

CL-65 Study Guide (25 decks)

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