Electrical Systems

Question 1

Current

Answer 1

I

Movement of electrons from positive to negative

Question 2

Voltage

Answer 2

E

Difference of potential of two charges

Question 3

Resistance

Answer 3

R
Opposition to current
Measured in Ohms

Question 4

Hertz

Answer 4

Hz
Measurement of cycles in a given period of time
Frequency

Question 5

Ohm’s Law

Answer 5

I=E/R

Current is directly proportional to voltage and inversely proportional to resistance.

Question 6

Alternating current

Answer 6

Constantly changes amplitude

Reversed direction at regular intervals

Question 7

Direct current

Answer 7

Flows in one direction

Question 8

How many generators are there?

Answer 8

3

One for each accessory mod and one for the APU

Question 9

What does each generator provide?

Answer 9

115/200 volts A/C
3 phases
400 Hz

Question 10

How many GCUs are there and what do they do?

Answer 10

3
Regulate generator output and provide over and under voltage protection and also frequency protection
Fault protection

Question 11

What does the number one generator control?

Alternating current

Answer 11

No. 1 AC Primary Bus
AC Essential Bus 
AC Secondary Bus
Controls No. 2 Primary Bus and AC Monitor Bus
APU Generator controls Auxiliary Power

Question 12

What does the battery provide power for?

Answer 12

DC Essential Bus

APU starting

Question 13

What is a circuit breaker?

Answer 13

A means to protect circuits from an over current condition

They are resettable

Question 14

What do the No. 1 and No. 2 primary AC Bus Breakers supply?

Answer 14

Armament 
Heating
Lighting 
Engine
Instrument
Radio loads

Question 15

What does the AC Monitor Bus breaker supply?

Answer 15

Main rotor blade deice

Question 16

What does the AC Secondary Bus supply?

Answer 16

Windshield anti ice and tail rotor blade deice

Question 17

What do the No. 1 and No. 2 Primary Bus supply power to?

Answer 17

Overhead console circuit breaker panels

Question 18

What do the battery bus and battery utility bus provide power to?

Answer 18

Lower console circuit breaker panel

Question 19

What does the battery conditioner/analyzer do?

Answer 19

Monitors battery voltage and temp

Contains circuit for battery charging

Question 20

How many AC to DC transformers/rectifiers power converters are there?

Answer 20

2

Question 21

DAFCS

Answer 21

Digital
Automatic
Flight
Control
System

Question 22

Compass

Answer 22

Two displacement gyroscopes
Each has a vertical and directional gyro
Synchro outputs representing heading, roll, pitch, and roll synchro signals to the TDP and AFCS for distribution to equipment

Question 23

Attitude Indicator

Answer 23

Displays aircraft attitude or artificial horizon

Question 24

Barometric Altimeter

Answer 24

Aircraft position above sea level

Question 25

Vertical Speed Indicator

Answer 25

Vertical speed

Question 26

Airspeed Indicator

Answer 26

Difference between impact pressure and static pressure

Question 27

Position lights

Answer 27

White light on tail rotor pylon

Red and green lights near main landing gears

Question 28

Anti collision lights

Answer 28

Red and white light under tail

Question 29

Where is the battery and what is its purpose?

Answer 29

Under co-pilot seat
24 volts DC ni-cad battery
Primary source of power to start APU

Question 30

Warnings to observe before applying power

Answer 30

Clear the stab
WOW closed
All switches off,safe, or normal
Power cord not energized when inserting extracting 
All circuit breakers secured