CRJ 700/900 Electrical

Question 0

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

Answer 0

4

Question 1

What is the APU generator rated at?

Answer 1

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

Question 2

What is the 28VDC supplied by:

Answer 2

Transformer Rectifier Units (TRU)

Question 3

The APU battery is:

Answer 3

24 volts DC, 43 ampere hour

Question 4

The main battery is:

Answer 4

24 volts DC, 17 ampere hour

Question 5

How many transformer Rectifier units supply DC buses

Answer 5

4

Question 6

Cranking power for the APU is supplied by:

Answer 6

APU Battery

Question 7

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

Answer 7

Main battery charged by: AC BUS No.1

APU Battery charged by: AC Service BUS

Question 8

The external AC power receptacle is located?

Answer 8

Forward right side of airplane

Question 9

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

Answer 9

EICAS Primary page

Question 10

Electrical system status and advisory messages are normally displayed on:

Answer 10

EICAS status page

Question 11

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

Answer 11

Variable engine speed to constant generator speed

Question 12

The IDG may be disconnected from the gearbox by

Answer 12

Disconnect switches located in the cockpit

Question 13

Once the IDG is disconnected it can be reconnected by

Answer 13

By maintenance on the ground with engine shut down

Question 14

The IDG converts variable engine speed to what constant RPM

Answer 14

12,000 RPM

Question 15

Fault protection for each generator is provided by

Answer 15

Generator control unit (GCU)

Question 16

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

Answer 16

Gen 1, APU, Gen 2, External AC

same side, inside, cross side outside

Question 17

IDG 2 normally powers

Answer 17

AC bus 2

Service bus

Question 18

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

Answer 18

120 amps

Question 19

An ESS TRU failure message will be displayed on EICAS when

Answer 19

Output is less than 18 VDC

Question 20

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

Answer 20

Complete power failure

Question 21

When are the main and APU batteries charging

Answer 21

Battery master switch ON and AC bus 1 powered

Battery master switch ON and AC Service Bus powered

Question 22

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

Answer 22

18 VDC

Question 23

An amber IDG fault light/caution light indicates

Answer 23

Low IDG oil pressure and/or high oil temp

Question 24

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

Answer 24

40 KVA

Question 25

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

Answer 25

GCU had detected a fault and taken associated Generator offline.

Question 26

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

Answer 26

AC ESS bus is not being powered by AC bus 1

Question 27

What are the generators rated at

Answer 27

40 KVA up to FL410

Question 28

Batteries supply DC electrical power to which buses

Answer 28

Main batt direct bus APU batt direct bus DC EMER bus

Question 29

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

Answer 29

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

Question 30

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

Answer 30

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

Question 31

How many AC generators are on the CRJ?

Answer 31

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

Question 32

Generator KVA Overload protection occurs at:

Answer 32

45 KVA for 5 minutes | 60 KVA for 5 seconds

Question 33

Bus priority for AC Bus 1:

Answer 33

Gen 1 APU Generator Gen 2 External Power

Question 34

Bus priority for AC Bus 2:

Answer 34

Gen 2 APU Generator Gen 1 External Power

Question 35

The aircraft engine driven and APU generators are rated at?

Answer 35

40 KVA

Question 36

Which DC Bus ties have automatic protection

Answer 36

Main tie Cross tie ESS tie

Question 37

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

Answer 37

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

Question 38

The ADG only supplies power to: (4 things)

Answer 38

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

Question 39

The ADG supplies AC power to:

Answer 39

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

Question 40

Items on the DC Emergency Bus ?

Answer 40

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

Question 41

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

Answer 41

115 volts AC