Electrical

Question 0

Location of the main battery?

Answer 0

Nose compartment

Question 1

Location of the APU battery?

Answer 1

Aft equipment bay

Question 2

Max engine generator load?

Answer 2

40 KVA

Question 3

Max APU generator load?

Answer 3

40 KVA

Question 4

Max Transformer Rectifier Unit (TRU) load?

Answer 4

120 amps

Question 5

Max permissible time for ground operations with battery power only?

Answer 5

5 minutes

Question 6

What is the reason for the previous limitation?

Answer 6

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

Question 7

How many TRUs are installed in the CRJ-900?

Answer 7

4

Question 8

Where are the TRUs located?

Answer 8

Nose compartment

Question 9

The main battery is rated to?

Answer 9

17 ampere hour, 24 volts

Question 10

APU battery is rated to?

Answer 10

43 ampere, 24 volt

Question 11

How many generators are installed?

Answer 11

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

Question 12

What is the function of the 4 TRUs?

Answer 12

To convert 115 volt AC to 28 volt DC

Question 13

How are the TRUs cooled?

Answer 13

Individual fans

Question 14

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

Answer 14

Main battery direct bus
APU battery direct bus
DC battery bus

Question 15

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

Answer 15

Yes

Question 16

Is there an on/off switch for the TRUs?

Answer 16

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

Question 17

What controls the DC tie contacters?

Answer 17

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

Question 18

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

Answer 18

With complete loss of A/C power

Question 19

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

Answer 19

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

Question 20

What is the ADG max load?

Answer 20

15 KVA

Question 21

The Main aircraft generators supply power to __ AC Buses

Answer 21

4

Question 22

Power for 28 VDC is supplied by…

Answer 22

Transformer Rectifier Units (TRU’s)

Question 23

Cranking power for starting the APU is provided by:

Answer 23

APU Battery

Question 24

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

Answer 24

AC BUS No. 1 and AC Service Bus

Question 25

The external AC power receptacle is located

Answer 25

Forward right side of the the airplane

Question 26

Electrical systems warning and caution messages are normally displayed on:

Answer 26

EICAS Primary Page

Question 27

Electrical system status and advisory messages are normally displayed on:

Answer 27

EICAS Status Page

Question 28

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

Answer 28

Variable engine speed to constant generator speed

Question 29

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

Answer 29

Disconnect switches located in the cockpit

Question 30

Once disconnected, the IDG...

Answer 30

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

Question 31

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

Answer 31

12,000 RPM

Question 32

Fault protection for each generator is incorporated in each:

Answer 32

(GCU) Generator Control Unit

Question 33

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

Answer 33

IDG 1, APU, IDG 2, External AC

Question 34

IDG 2 normally powers

Answer 34

Ac Bus 2 and the Service Bus

Question 35

Main Tie, Cross Tie, and ESS Tie Contactors

Answer 35

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

Question 36

An Amber IDG fault light/caution light indicates

Answer 36

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

Question 37

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

Answer 37

Generator over current or a bus fault

Question 38

An AC ESS XFER switch light on the Electrical panel indicates

Answer 38

AC Essential Bus is not being powered by AC Bus 1