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A&P Powerplant Oral Practice Questions > Engine Electrical Systems > Flashcards

Engine Electrical Systems Flashcards

1
Q
  1. How would you seat newly installed generator brushes to the commutator?
A
  1. Remove cover
  2. Remove brushes
  3. Install sandpaper
  4. Install new brushes
  5. Rotate generator
  6. Remove brushes
  7. Remove sand paper
  8. Blow out generator
  9. Install new brushes
  10. Install cover
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2
Q
  1. When is it necessary to replace the brushes in a starter?
A

When half original length

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3
Q
  1. Where is the generator rating & performance data located?
A

On date plate attached to generator

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4
Q
  1. What units make up a DC generator three unit regulator?
A

Voltage regulator
Current limiter
Reverse current cutout

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5
Q
  1. What methods is used to control the voltage of an aircraft alternator?
A

Voltage regulator

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6
Q
  1. What determines the frequency of the voltage of an alternator?
A

The speed of rotation of the rotor & number or poles

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7
Q
  1. How is alternator frequency maintained?
A

Installing constant speed drive unit between engine & alternator

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8
Q
  1. What are the three basic types of DC motors?
A

Series
Shunt
Compound

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9
Q
  1. Name the parts of a DC motor?
A

Armature
Brushes
Commutator
Field frame

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10
Q
  1. Why is a starter generator system, used on many turbine systems?
A

Save space & weight, starts engine then switches to a generator

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11
Q
  1. Why should stranded wire be sued in powerplant applications?
A

Less fatigue & break from vibrations

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12
Q
  1. What is the America wire gauge system of designating electrical wire sizes?
A

Wire assigned a number based on its cross sectional area

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13
Q
  1. What is open wiring?
A

Any wire not in closed in insulation or conduit

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14
Q
  1. What methods are used to control the voltage output of DC aircraft generators?
A

Vibrating type voltage regulator, three unit regulator, and carbon pile

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15
Q
  1. What aircraft electrical system normally doesnt have a fuse or circuit breaker?
A

Starter circuit

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16
Q
  1. Why are protective covers placed on some electrical switches?
A

Prevent switch from accidentally being actuated

17
Q
  1. What are the causes of excessive arcing at the generator brushes?
A

Commutator is dirty, rough, or out of round

18
Q
  1. When installing single wires or wire bundles, how much slack is normally allowed between supports?
A

Not exceed .5”

19
Q
  1. What precaution should be taken when ruining wires close to heated ducts or exhaust stacks?
A

Wires should be insulated with high temp resistant material

A&P Powerplant Oral Practice Questions (15 decks)

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