DC/AC
What Is used to polish Slip-Rings or Commutators?
Very Fine Sandpaper
What electric motor is used to start the engine?
Direct Current or
Series-wound or
Direct drive electric motor.
Most modern aircraft use ____ to protect electrical circuits.
Circuit Breakers
Blubs, switches, motors and components are much easier the repair or replace than what?
Wires/Wiring
What component is most important when in terms of protection?
wires
What are the two regulating factors that affect frequency output in an AC generator?
# of Poles
Rotation Speed
In a DC starter when are brushes replaced?
Half-Worn stage
Which CFR outlines the requirements for automatic reset breakers?
14CFR Part. 23
What prevents backflow into the battery?
Rectifier
Tin, Nickel, and Silver are important to wires, why?
prevent oxidation of copper wires.
How does the aircraft charging system charge the battery?
Constant Voltage and Varying Current
A high horse power recip. engine typically consists of two basic components, what are they?
Gear section
Motor Assembly
aircraft carrying fuses are under what CFR-Part?
14CFR PART. 91
What does the Reverse-current cutout relay do?
Opens main Gen. circuit, when Gen. voltage drops below Batt. voltage
When pulling wires through a conduit what lubricant is recommended?
Soapstone Talc
Why are AC electrical systems used in large aircraft?
Weight Savings
Gas Turbine Engines are started by rotating what?
N2/High-Pressure spool
How does a trip free breaker work?
stays open as long as an overload or fault exists.
What is a CSD and what does it do?
keeps the alternator at a set speed which keeps the frequency at a constant.
Why should you stagger splices?
prevent bundles from getting excessively large in one spot.
What does the generator master switch open, to reduce generator output to residual voltage?
Generator Field Circuit
What is required when a DC motor is first started?
High surge of current
Why are the Main Starter Motor Circuits special compared to other circuits?
they do not have a resettable protection device.
What does the split-type master switch allow?
the Generator or Alternator to be turned off without disconnecting the Battery.
Explain the difference between gauges 1-9 and gauges 11-24.
usage of insulated terminals, 11+ uses whilst 9- doesn't.