ELO H Electrical Systems

Question 1

AC voltages

Answer 1

115 and 200

Question 2

Generators on helicopter

Answer 2

APU
#1 generator
#2 generator

Question 3

Electricity

Answer 3

Energy made available by the flow of an electric charge through a conductor

Question 4

Voltage

Answer 4

Electrical force that makes electricity move through a wire. Voltage moves the free electrons from one atom to another.

Question 5

Volts

Answer 5

Voltage measured between two points and recorded

Question 6

Amperage

Answer 6

Flow of electricity through a given wire

Question 7

Amp

Answer 7

Amperage measurement of the flow rate of electrons moving through a wire An amp to a wire is like the flow rate of water in a hose

Question 8

Resistance

Answer 8

The amount of constriction put on the amperage as it flows.

Question 9

Ohms

Answer 9

Unit of measurement for resistance

Question 10

Alternating current (AC)

Answer 10

The AC electrical system uses two different voltages 115v single phase and 200v three phase.

Question 11

Direct Current (DC)

Answer 11

Provides constant unidirectional voltage or current to a component. Not common

Question 12

A/C Current

Answer 12

Voltage and current periodically reverse direction. Easily regulated for the sensitive avionics installed. The higher the voltage with less amps means the smaller the wire can be to do the same amount of work. Reduces aircraft weight.

Question 13

Primary source of power

Answer 13

AC

Question 14

Prime source of an AC electrical systems

Answer 14

a 115/200 Volts Alternating Current (VAC) main generator

Question 15

Three generators

Answer 15

1, #2, and APU

Question 16

Main Generator Locations

Answer 16

Each of the two main generators is mounted on and driven by the #1 and #2 main transmission accessory gear box modules.

Question 17

Main generator capabilities

Answer 17

providing all AC power for the aircraft if the other generator should fail except the blade de-ice system

Question 18

APU Generator Location

Answer 18

Second priority The APU generator is mounted directly to the output drive of the APU and is air cooled.

Question 19

APU Generator Purpose

Answer 19

(1.) AC power for ground operation. (2.) Back-up emergency AC power in flight.

Question 20

Converter

Answer 20

turns AC to DC energy

Question 21

Generator Control Unit (GCU) purpose

Answer 21

Under voltage protection Feeder fault Over voltage protection Under frequency protection Voltage Regulation

Question 22

Sealed Lead Acid Battery (SLAB)

Answer 22

Secondary or emergency source of DC power.