Electrical Systems

Question 1

Where is the ELEC power panel located?

Answer 1

Overhead Switch Panel

Question 2

How are the main AC generators cooled and lubricated?

Answer 2

Oil cooled and lubricated by the AFT XSMN Main Oil Lubrication System

Question 3

The GCUs protect the AC system from what four conditions?

Answer 3

Over Voltage, Under Voltage, Under Frequency, Feeder Fault

Question 4

Where are the No 1 and No 2 AUX PDPs located?

Answer 4

Left and Right side Cabin (Mid-Point)

Question 5

How is the APU generator cooled?

Answer 5

Air Cooled by a built-in fan

Question 6

An indicator on the center instrument panel indicates when the battery voltage drops below _____ Vdc

Answer 6

20

Question 7

What is the purpose of the AC bus-tie gang bars on each PDP?

Answer 7

Isolate respective system to prevent “bus-tie” from occurring to the other side

Question 8

With the BATT switch in the OFF position, the battery supplies DC electrical power only to the _____ bus.

Answer 8

Battery Bus

Question 9

The battery bus can be energized by what two sources of DC electrical power?

Answer 9

Battery
No. 1 DC Bus

Question 10

What is the order of priority for the DC electrical system from highest to lowest?

Answer 10

Transformer Rectifiers, External DC Power, Battery

Question 11

True or False? The BATT switch must be in the ON postion in order to recharge or maintain the charge of the battery.

Answer 11

True

Question 12

What three DC buses are powered by the battery with the BATT switch in the ON position?

Answer 12

Batt Bus, Essential 1 and 2

Question 13

If the APU is running or external AC power is connected, DC power is supplied by the helicopter _____.

Answer 13

Transformer Rectifier

Question 14

What is the order of priority of power for the AC electrical system from highest to lowest?

Answer 14

Main AC Generator, APU Generator, External AC Power

Question 15

What “system” allows either main generator to provide electrical power to both buses should a single generator fail or be taken off-line?

Answer 15

Bus-Tie System

Question 16

If all three generator switches are placed to the ON position (#1 Main, #2 Main, and APU), which one(s) will provide electrical power to the #1 and #2 AC buses?

Answer 16

Each main AC gen will provide power to its respective bus. APU gen power will not be connected to the bus.

Question 17

The primary active caution messages to look for in determining whether or not a bus-tie exists are the respective RECT FAIL (OFF), ENG FUEL PRESS LO, and____

Answer 17

AFCS FAIL

Question 18

Should both generators fail, both rectifiers will be ______.

Answer 18

Disabled

Question 19

What will be the indications if a bus-tie DOES NOT exist when a RECT1 or RECT2 OFF becomes active?

Answer 19

RECT 1 or 2, AFCS FAIL, ENG FUEL PRESSURE

Question 20

What indications will you have that a bus-tie DOES exist during a single generator failure?

Answer 20

None besides appropriate GEN caution

Question 21

Each AC generator produces how much power?

Answer 21

40 kva and 32,000 watts

Question 22

How do the AC generators produce a current?
How many phases?

Answer 22

By creating a change in magnetic field (spinning magnetic)

Three phase AC power

Question 23

How much KVA is produced by APU generator?

Answer 23

20 KVA

Question 24

At max load, what % of load can each EAPS fan consume from the AC generators

Answer 24

16.5% each

Question 25

What components provide electrical power to the No. 1 and No. 2 DC buses

Answer 25

No.1 and No.2 Transformer Rectifiers

Question 26

what components measure electrical current as it leaves the generator and again as it enters the electrical bus

Answer 26

current transformers