Electrical

Question 1

What supplies the primary power for the 28 VDC system?

Answer 1

A DC Generator installed on each engine.

Question 2

Both the current and voltage of the two generators are independently controlled and regulated by separate?

Answer 2

Generator Control Units (GCUs).

Question 3

Generator voltage is regulated to _____ VDC.

Answer 3

28.5 VDC

Question 4

Maximum Generator Output is?

Answer 4

400 Amps

Question 5

The APU Starter/Generator supplies which bus?

Answer 5

DC Main Bus 2

Question 6

The maximum rated amperage of the APU Starter/Generator is?

Answer 6

400 amps

Question 7

What type of batteries are on the plane?

Answer 7

24 VDC nickel-cadium

Question 8

Which bus are the batteries connected to?

Answer 8

Each is connected to its respective DC Main Bus by a battery relay.

Question 9

When using 28 VDC ground power, how is it connected to the system?

Answer 9

The GPU powers DC Main Bus 1 and DC Bus 2 is powered through the Bus Tie automatically when the DC EXT button is pressed.

Thenonly time the DV bus closes automatically.

Question 10

What can supply 28 VDC power to the DC ESS BUS in the event of a DC Generator failure?

Answer 10

Transformer Rectifier Unit (TRU) can provide 150 amps.

Question 11

What monitors current and voltage in the electrical system?

Answer 11

Bus Power Control Unit (BPCU)

Question 12

What powers the Emergency Power Supply (EPS)

Answer 12

A Lead Acid Battery maintained in the fully charged condition by DC Bus 1.

Question 13

The DC EMERG PWR BUS is powered by the EPS for approximately?

Answer 13

30 minutes.

Question 14

What does the DC EMERG PWR BUS supply?

Answer 14

1. Standby Horizon
2. Chronometer
3. Lighting of the Standby Altitude/Airspeed Indicator and Standby Compass.

Question 15

If the aircrafts power supply fails, what provides backup power to the BPCU?

Answer 15

A backup power supply lead acid battery. (approximately 30 minutes)

Question 16

During normal operations, what powers the BPCU?

Answer 16

DC Essential Bus

Question 17

AC Power is made by?

Answer 17

Two fully independent engine driven alternators.

Question 18

The engine driven alternators power which busses?

Answer 18

AC BUS 1 and AC BUS 2

Question 19

What equipment does AC provide power to?

Answer 19

1. Main Hydraulic Pumps
2. Ice Detector
3. Probe Heat
4. Windshield Heat
5. Horn Heat

Question 20

In the event of a single Alternator failure how is AC Bus 1 and AC Bus 2 powered?

Answer 20

AC Bus Tie

Question 21

The two static inverters supply 26VAC/400Hz power to what?

Answer 21

1. FDR
2. CVR
3. TCAS
4. EGPWS
5. Trim Pointers

Question 22

Inverter 1 is supplied by?

Inverter 2 is supplied by?

Answer 22

Inverter 1 —DC ESS BUS

Inverter 2–DC NON ESS BUS