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Aircraft Electrical Circuits

Description

FAA Questions From Section B of the Aircraft Electrical Systems Section
Trenton Kreft
Quiz by Trenton Kreft, updated more than 1 year ago
Trenton Kreft
Created by Trenton Kreft over 7 years ago
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Resource summary

Question 1

Question
When AC generators are operated in parallel, the.........
Answer
  • Amperes and voltage must both be equal.
  • Amperes and frequency must both be equal.
  • Frequency and voltage must both be equal

Question 2

Question
An ammeter in a battery charging system is for the purpose of indicating the....
Answer
  • Rate of Current used to charge the battery.
  • Amperage available for use.
  • Total amperes being used in the airplane.

Question 3

Question
During ground operation, aircraft generator cooling is usually accomplished by....
Answer
  • Auxiliary air cooled through an air/fuel heat exchanger.
  • An integral fan.
  • An external motor driven fan

Question 4

Question
What type of instrument is used for measuring very high values of resistance?
Answer
  • Shunt type ohmmeter.
  • Multimeter.
  • Megohmmeter

Question 5

Question
Grounding is electrically connecting a conductive object to a primary structure. One purpose of grounding is to....
Answer
  • Prevent development of radio frequency potentials.
  • Prevent current return paths.
  • Allow static charge accumulation.

Question 6

Question
When using the voltage drop method of checking circuit resistance, the....
Answer
  • Input voltage must be maintained at a constant value.
  • Output voltage must be maintained at a constant value.
  • Input voltage must be varied

Question 7

Question
The primary considerations when selecting electric cable size are....
Answer
  • The voltage and amperage if the load it must carry.
  • The system voltage and cable length.
  • Current carrying capacity and allowable voltage drop.

Question 8

Question
In Installations where the armature is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?
Answer
  • 75
  • 100
  • 50

Question 9

Question
How should a voltmeter be connected?
Answer
  • In series with the load.
  • In parallel with the load.
  • In series with the source.

Question 10

Question
Certain transport aircraft use AC electrical power for all normal operation and battery furnished DC electrical power for standby emergency use. In aircraft of this type that operate on DC generators, the batteries are kept charged by....
Answer
  • Rectifiers which use the aircraft's AC generators as a source of power.
  • Alternators which use the aircraft's AC generator as a source of power
  • Inverters which use the aircraft's AC generator as a source of power.

Question 11

Question
Which of the following must be accomplished when installing and anti-collision light?
Answer
  • Install a switch independent of the position light switch.
  • Connect the anti-collision light to the aircraft position light switch.
  • Use shielded electrical cable to assure fail safe operation.

Question 12

Question
The inductor type inverter output voltage is controlled by the....
Answer
  • DC stator field current.
  • Voltage regulator.
  • Number of poles and the speed of the motor.

Question 13

Question
The over-voltage control automatically protects the generator system when excessive voltage is present by....
Answer
  • Opening and resetting the field control relay.
  • Breaking a circuit to the trip coil of the field control relay.
  • Opening the shunt field circuit.

Question 14

Question
When DC generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by....
Answer
  • Decreasing the output of the high generator to equal the output of the lower generator.
  • Increasing the output of the low generator and decreasing the output of the high generator until they are equal.
  • Increasing the output of the low generator to equal the output of the high generator.

Question 15

Question
A battery generator system provides direct current. On installations requiring alternating current from the battery generator system, it is necessary to have....
Answer
  • A variable resistor between the battery and the generator.
  • A transformer.
  • An inverter.

Question 16

Question
The purpose of a rectifier in an electrical system is to change....
Answer
  • Direct current to alternating current.
  • Alternating current to direct current.
  • The frequency of the alternating current.

Question 17

Question
In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read....
Answer
  • Either the component or the circuit is shorted.
  • The component has continuity and is not open.
  • The component has continuity and is open.

Question 18

Question
Upon completion of the landing gear extension cycle, the green light illuminated and the red light remained lit. What is the probable cause?
Answer
  • Short in the up limit switch.
  • Short in the gear safety switch.
  • Short in the down limit switch.
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