Aircraft Electrical Systems Flashcards

1
Q
  1. What is the purpose of a circuit breaker?
A

To protect the circuits & wires from fire.

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2
Q
  1. What re the two principles on which circuit breaker operates?
A

Thermal & magnetic

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3
Q
  1. What tool is used to measure the size of unmarked electrical wire?
A

Wire gauge

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4
Q
  1. What are the colors of aircraft position lights and where are they mounted?
A

Green light - right wingtip
Red light - left wingtip
White light - visible from rear of aircraft

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5
Q
  1. What are the factors to be considered when selecting wire size for electrical power?
A

Allowable power loss
Permissible voltage drop
Current carrying ability of the conductor

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6
Q
  1. When is a circuit breaker or fuse designed to open the circuit?
A

Before conductor emits smoke

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7
Q
  1. What type of breakers are not acceptable for use in aircraft?
A

Auto reset

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8
Q
  1. What is a slow-blow fuse?
A

A fuse that compensates for surges & high inrush current by delaying by a few milliseconds

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9
Q
  1. What are the three most common faults that occur in an electrical circuit?
A

Open circuits
Shorted circuits
Low power

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10
Q
  1. What size electrical conduit should be used for a specific cable bundle?
A

25% larger than maximum wire bundle

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11
Q
  1. What color insulator on a solderless connector is proper for a 10 gauge wire?
A

Yellow

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12
Q
  1. How should electrical switches typically be oriented in the on position?
A

Up or forward

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13
Q
  1. When should electrical switches be de-rated from their normal current rating?
A

High rush-in circuits
Inductive circuits
DC motor circuits

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14
Q
  1. When do DC electric motors draw several times their rated current?
A

During starting

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15
Q
  1. What would cause an AC electrical motor to run too fast?
A

Excessive supply of voltage or motor field windings shortened

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16
Q
  1. What would cause an AC electrical motor to run too slow?
A

Low voltage
Defective wiring
No lubrication

17
Q
  1. How is the output voltage of an alternator controlled?
A

Voltage regulator

18
Q
  1. What should be checked before any aircraft electrical load is increased?
A

Associated wires
Conductors
Circuit protection devices

19
Q
  1. What is the main advantage of using AC for aircraft electrical power systems?
A

Easily changed using transformers

20
Q
  1. In AC power systems, how is DC obtained for battery charging?
A

Using rectifiers

21
Q
  1. What warns pilots of overheating batteries?
A

Thermal sensor in the battery & light in cockpit

22
Q
  1. How long should bonding jumper wires be made?
A

Large enough to handle return current but short enough to prevent increase in resistance

23
Q
  1. How are the two items that wear on start generators?
A

Commutator & brushes

24
Q
  1. What power the ELT?
A

ELT Battery

25
Q
  1. What is the purpose of a static wick?
A

Dissipates static energy from aircraft to avoid damaging electrical systems