Electrical

Question 1

Location of Main Battery

Answer 1

Nose compartment

Question 2

Location of the APU Battery

Answer 2

Aft equipment bay

Question 3

Max Engine Generator load

Answer 3

40 KVA

Question 4

Max APU Generator load

Answer 4

40 KVA

Question 5

Max Transformer rectifier unit (TRU) load

Answer 5

120 amps

Question 6

Max permissible time for ground operations with battery power only

Answer 6

5 minutes

Prevents ED1/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 hour/24 volts

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 V AC to 28 V DC

Question 13

How are the TRU’s 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 TRU’S

Answer 16

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

Question 17

What controls the DC tie contactors

Answer 17

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

Question 18

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

Answer 18

AC ESS Bus, Hydraulic pump 3B, flaps/slats, STAB trim CH 2

Question 19

What is the ADG max load

Answer 19

15 KVA

Question 20

ENG driven IDGs have an overload rating of

Answer 20

45KVA/5min

60KVA/5sec

Question 21

Main Generators provide AC power to how many AC buses

Answer 21

4

Bus 1/2, ESS Bus, Service Bus

Question 22

Power to the 28v DC Systems is supplied by

Answer 22

4 TRUs

Transformer Rectifier Units

Question 23

TRU 1 Supplies PWR to

Answer 23

DC Bus 1

Question 24

TRU 2 supplies PWR to

Answer 24

DC Bus 2

Question 25

ESS TRU 1/ESS TRU 2 normally supplies

Answer 25

DC ESS Bus

Question 26

The Main Battery is charged by

Answer 26

AC Bus 1

Question 27

The APU Battery is charged by

Answer 27

AC Service bus

Question 28

IDG provide a means of converting

Answer 28

variable engine speed to contact GEN speed of | 12,000rpm

Question 29

Fault protection is provided by

Answer 29

Generator Control Units (GCUs)

Question 30

Priority for allowing power to AC Bus 1 is

Answer 30

Gen 1 APU Gen 2 External AC

Question 31

IDG 2 (Gen2) normally powers

Answer 31

AC Bus 2 | Service Bus

Question 32

Which DC Bus ties are automatic

Answer 32

``` Main Tie Cross Tie ESS Tie TRU Contactor Control ESS TRU Transfer ```

Question 33

The ADG will auto deploy

Answer 33

``` With complete loss of A/C power AC Bus 1&2 falls below 50v WOW indicates Aircraft is airbourne Any GEN was online for 3.45 sec prior to power loss on AC Bus 1/2 ```

Question 34

Amber IDG Fault/Caution light indicates

Answer 34

Low IDG oil pressure / High oil Tempurture

Question 35

AUTO XFER fail light on Electrical panel indicates

Answer 35

GEN overcurrent or Bus Fault

Question 36

AC ESS XFER light (White) on ELEC panel indicates

Answer 36

AC Bus 1 is no longer powering AC ESS Bus

Question 37

What happens when you switch on the DC SERVICE switch

Answer 37

- W/no AC PWR, SERV BUS is powered by APU BATT BUS via Service Bus contactor - SERVICE CONFIGURATION message appears on DC Synoptic page - Service Bus contactor not represented on DC Synoptic page

Question 38

What happens when the Battery Master is | Switched on

Answer 38

Connects Main Battery to BATT BUS through MAIN BATT Direct Bus APU Battery to BATT BUS through APU BATT Direct Bus

Question 39

How many DC busses are there

Answer 39

9 ``` DC Bus 1,2 Service Bus Utility Bus ESS Bus BATT Bus APU Battery Direct Bus MAIN Battery Direct Bus DC EMER Bus ```

Question 40

What happens when TRU 1 fails

Answer 40

``` Main Tie Contactor Closes TRU 2 PWRs DC Bus 1 DC Utility Bus loads sheds Status Message Appears: -(TRU1 failed, Main Ties Closed) ```

Question 41

What happens when TRU 1 and 2 fail

Answer 41

DC Main and Cross Tie automatically closes ESS TRU 2 PWRs: -DC Bus 1/2, DC SEV Bus DC Utility Bus is shed (OFF) Status Message appears: -Main&Cross Tie have closed -TRU 1/2 failed

Question 42

What happens when ESS TRU 1 fails

Answer 42

DC ESS Tie closes allowing ESS TRU 2 to power DC ESS Bus DC ESS Tied Closed Status Message appears

Question 43

Which DC Bus Ties DON'T have automatic operations

Answer 43

Service Bus Contactor It is activated by DC Service switch on the overhead panel when there is no AC power to airplane