Crj Electrical

Question 0

What is the primary source of ac power.

Answer 0

Ac powered delivered by the idg. (Integrated drive generators)

Question 1

What power does the crj use

Answer 1

115 vac and 28 v dc

Question 2

How is ac converted to dc

Answer 2

Through 5 tru located in nose

Question 3

What are sources of dc power.

Answer 3

Converted power from tru.

Two dc batteries in aft store dc power for emergency and normal ops.

Question 4

How many cbs are there

Answer 4

5

4 up front 1 in aft

Question 5

What power do the idg supply

Answer 5

115 vac 400 he 3 phase

Question 6

What does the idg consist of

Answer 6

The constant speed drive csd
(Maintains constant rpm for consistent generator electric output)

The generator

Question 7

How is the oil in the idg cooled.

Answer 7

Bypass air from n1

Question 8

What does thd fault light on the idg indicate?

Answer 8

Acts as an oil light for idg. Overheat or pressure.

Question 9

When will idg disconnect automatically?

Answer 9

Over temp or over torque

Question 10

What conditions will cause a generator to be tripped off line.

What unit controls that?

Answer 10

Over/ under voltages
Over/ under frequency
Generator or bus over current

Gcu (generator control unit)

Question 11

For external ac power to be accepted what is checked?

Answer 11

Voltage, phase and frequency

Question 12

What is the power priority for bus 1 and bus 2

Answer 12

On side gen
Apu
X side gen
External power

Question 13

What does thd ac ess transfer button do?

Answer 13

Manually transfers power to the ess bus from bus 1 to bus 2

Question 14

What happens when ac power is lost.

Answer 14

Adg deployes and connects to the essential bus.

Question 15

How do we get power back to the ess bus from bus 1 after power has been restored?

Answer 15

By pressuring the per txfr override button on lower pedestal.

Question 16

What do the utility buses provide power to?

Answer 16

Galley and battery chargers

Question 17

When are utility buses auto shed?

Answer 17

During flight when a gen fails. Load shedding.

On ground…single gen, flaps not up and pax and service doors closed.

Question 18

What does the adg power?

Answer 18

Ac ess bus and acmp 3b pump

Question 19

What is required for adg auto deploy?

Answer 19

Bus 1and 2 not powered and all 3 gens inoperative.

Question 20

How many dc buses are there?

Answer 20

10

Question 21

What are the dc batteries for?

Answer 21

Emergency power and apu starting on ground.

Question 22

What is the amperage of each tru?

Answer 22

100 amps

Question 23

What are thd five trus?

Answer 23

Tru1
Tru1
Tru1 ess
Tru2 ess
Serv tru

Question 24

Which dc tie contractors can be manually selected? which ones are auto?

Answer 24

All can be manually selected.

Only tie 1 and 2 are auto

Question 25

When are dc utility buses load shed.

Answer 25

When associated tru is not powered.

Question 26

What are the power outputs of both batteries.

Answer 26

Main 24vdc at 17 amperes

Apu 24vdc at 43 amperes

Question 27

What dc buses do the batteries supply power to

Answer 27

Main batt bus
Apu batt dir bus
Dc emer bus
Dc batt bus

Question 28

What does the dc emer bus provide power to?

Answer 28

Apu fire extinguishers

Fuel and hydraulic shutoff valves

Question 29

The dc emer bus is connected to the batteries via what buses?

Answer 29

Apu dir batt bus and the batt bus and is continuously powered .

Question 30

How long can the batteries supply emer power for?

Answer 30

30 minutes

Question 31

Will you lose emer power upon touchdown?

Answer 31

Yes wow removes power from the dc ess bus unless the adg handle us pulled to make that connection