Electrical System

Question 0

The AC power is used for operation and control of _____ _____.

Answer 0

Aircraft systems

Question 1

The electrical system consists of ___ solid state regulated converters, a ___-ampere hour sealed lead acid battery, and ___ DC buses.

Answer 1

3
24
6

Question 2

What are the two ways to get power without the proprotors turning?

Answer 2

External power

CFG 1 when the APU is running

Question 3

CFGs provide ___/___ volts, _____ phase, ___ Hz AC power.

Answer 3

115/200
Three
400

Question 4

What are the two sources of DC power?

Answer 4

Battery

Regulated converters

Question 5

The battery provides power for _____ starting or _____ _____.

Answer 5

APU

Ground maintenance

Question 6

The AC electrical system provides power for what three things?

Answer 6

Main power
IPS
Environmental control system

Question 7

Main power is provided by which generators?

Answer 7

CFGs

Question 8

CFG 1 is cooled by the _____ and CFG 2 is cooled by the _____.

Answer 8

MWGB

TAGB

Question 9

The CFGs weigh ___ pounds

Answer 9

80

Question 10

The VFGs provide ___/___ V, ____ phase, ___ - ___ Hz AC power

Answer 10

115/220
Three
360-457

Question 11

Each CFG is rated at ___ kilovolt ampere (kVA) and power the No.1 and No. 2 _____ _____

Answer 11

40

AC buses

Question 12

The VFGs provide power to which systems?

Answer 12

IPS

ECS

Question 13

Each VFG weighs ___ pounds and is rated at __/__ kVA

Answer 13

60

50/80

Question 14

How are the VFGs cooled/lubricated and how do you check the oil level?

Answer 14

They have self-contained cooling/lubricating systems and have sight gauges to check the oil level

Question 15

On hotter days, normally expect _____ power availability from the VFGs

Answer 15

Less

Question 16

Oil temps from ___-___, VFG rated at 80 kVA

Answer 16

-54°C - 75°C

Question 17

Oil temperatures from ___-___, VFG rated at 50 kVA

Answer 17

76°C - 95°C

Question 18

Internal to each VFG is a separate and isolated set windings that make up a _____ _____ _____.

Answer 18

Permanent magnet generator

Question 19

The sole purpose of the PMGs is to provide power to the _____

Answer 19

FCCs 1 & 2

Question 20

The PMGs provide a maximum power output of ___ volt amps

Answer 20

420

Question 21

The _____ provides an electrical method for monitoring low oil levels in the aircraft generators

Answer 21

Ground refuel/defuel panel

Question 22

The generator control units do what three things?

Answer 22

1. Provide frequency, voltage, and differential feeder current monitoring.
2. When within parameters, allow generators to connect to the circuits.
3. When a fault is detected, will not allow the generator to energize respective circuits.

Question 23

Can the CFGs supply power for the IPS?

Answer 23

No

Question 24

If at least one VFG remains online, it will supply anti-ice protection to what?

Answer 24

Engine inlets | Spinner afterbodies

Question 25

Can the CFGs power the ECS?

Answer 25

Yes through an automatic bus tie should the VFG fail

Question 26

The battery is directly connected to the _____ & _____ buses.

Answer 26

Unswitched | Maintenance

Question 27

The battery is normally charged by the _____ regulated converter.

Answer 27

No. 3

Question 28

The battery is a ___ volt DC, ___ amp-hour battery.

Answer 28

24 | 24

Question 29

At 80% charge the battery provides sufficient power for what three things and still have 18% capacity remaining?

Answer 29

1. Pressure refueling 2. 3-minute prestart period 3. Two APU start cycles

Question 30

In flight, at 80% charge, the battery will provide ___ minutes of emergency power for flight essential equipment.

Answer 30

20

Question 31

Certain failure modes and/or repeated generator reset attempts could cause what to happen?

Answer 31

A fire

Question 32

What six things do you lose with an essential/battery bus failure?

Answer 32

1. Standby attitude indicator 2. Standby flight display 3. COMM 1 & 2 4. ICS 5. Fire detection/protection system 6. Audio warnings and tones

Question 33

Cycling operable CONV circuit breakers increases the chance of what?

Answer 33

Losing more than one bus