CRJ900 Systems Electrical

Question 1

The aircraft engine driven and APU generators are rated at

Answer 1

40 KVA

Question 2

The main aircraft generators supply power to how many AC buses

Answer 2

4

Question 3

Power for 28 VDC is supplied by

Answer 3

Transformer Rectifier Units

Question 4

The APU battery is rated at

Answer 4

24 volts and 43 ampere hours

Question 5

The main battery is rated at

Answer 5

24 volts and 17 ampere hours

Question 6

How many transformer rectifier units (TRU’s) supply power to the DC buses

Answer 6

4

Question 7

Cranking power for starting the APU is provided by

Answer 7

APU battery

Question 8

The ADG supplies AC power to

Answer 8

FlASH

Flaps/Slats
AC ESS BUS
Stab Trim CH2
Hydraulic Pump 3B

Question 9

The main APU batteries are kept in charged condition by the battery chargers powered by

Answer 9

AC BUS No1 and AC Service Bus

Question 10

The external AC power receptacle is located

Answer 10

Forward right side of the airplane

Question 11

Electrical systems warning and caution messages are normally displayed on

Answer 11

EICAS primary page

Question 12

Electrical system status and advisory messages are normally displayed on

Answer 12

EICAS status page

Question 13

The Integrated Drive Generator (IDG) provided a means of converting

Answer 13

Variable engine speed to constant generator speed

Question 14

The IDGs may be disconnected from the gearbox by

Answer 14

Disconnect switches located in the cockpit

Question 15

Once disconnected how can the IDG can be reconnected

Answer 15

Can only be manually re-connected on the ground with the engines shutdown by maintenance

Question 16

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

Answer 16

12,000 RPM

Question 17

Fault protection for each generator is incorporated in each

Answer 17

Generator control unit

Question 18

The priority for allowing power to AC Bus 1 would be

Answer 18

IDG 1, APU, IDG 2, External AC

Question 19

IDG 2 normally powers

Answer 19

AC Bus 2 and Service Bus

Question 20

The ADG supplies power to

Answer 20

1. 3B hydraulic pump
2. AC Essential
3. ADG bus
   4 EICAS
   5 Slats and Flaps
   6 STAP Trim CH2

Question 21

115 VAC is supplied to TRUs for DC static conversion, and each TRU is rated at

Answer 21

120 amps

Question 22

Main Tie, Cross Tie, and Ess Tie Contactors

Answer 22

Are controlled automatically by the DCPCs

Question 23

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

Answer 23

Complete AC power failure

Question 24

An amber IDG fault light/caution light indicates

Answer 24

Low IDG oil pressure and/or high IDG oil temperature

Question 25

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

Answer 25

Generator over current or bus fault

Question 26

An AC ESS XFER switch light on the electrical panel indicates

Answer 26

AC Essential Bus is not being power by AC Bus 1

Question 27

What are the generators rated at?

Answer 27

40 kva up to FL410