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Aircraft General Knowledge > Motors > Flashcards

Motors Flashcards

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1
Q

What is the purpose of an electric motor?

A

To convert electrical energy to mechanical energy.

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2
Q

What is an electrical motor similar to?

A

Generator

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3
Q

What determines the required size of starter motor?

A

Size of engine

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4
Q

What is dependant upon the current and voltage in an electric motor?

A

Torque

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5
Q

Electrical motors can be Ac or Dc/just Dc/justAc

A

Ac or dc

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6
Q

What can cause motor damage?

A

Motor runaway

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7
Q

What is the rotating part of the electric motor?

A

Rotor

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8
Q

What is the stationary part of an electric motor called?

A

Stator.

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9
Q

If something is synchronous what does it mean?

A

Rotates at same input frequency

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10
Q

If something is asynchronous what does this mean

A

Rotates out at same frequency

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11
Q

How do you calculate torque?

A

Voltage x current / RPM

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12
Q

What does a series wound give on a starter motor?

A

High starting torque

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13
Q

What can a shunt wound not start under?

A

Load

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14
Q

What wound is used in modern aircraft?

A

Compound wound

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15
Q

What is a motor fuse?a

A

A fuse that can withstand a higher current due to high current on start up

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16
Q

What can occur in a rotor seizure?

A

Overheating due to the motor trying to keep up with rpm

17
Q

Which of the following statements are correct regarding DC electric motors?

  1. If a motor seizes, then the the applied EMF is equal to the back EMF
  2. If a motor seizes, then the applied EMF is equal to the net EMF
  3. If there is a motor runaway, the applied EMF is equal to the back EMF
  4. If there is a motor runaway, the back EMF is equal to the net EMF
A

2,3

18
Q

In the event of an AC generator fault, on a twin engine aircraft, the protection device will open…

A

the exciter control relay and the generator breaker.

19
Q

The pilot detectes a low oil pressure in the Integrated Drive Generator (IDG). The pilot…

A

Operate the IDG disconnect switch

Aircraft General Knowledge (49 decks)

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