THREE PHASE INDUCTION MOTORS QUIZ

The term cogging is associated with

Compound generators

Dc series motors

Three phase transformer

Induction motors

TRUE ANSWER : ?
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Size of a high speed motor as compared to low speed motor for the same HP will be

Any of the listed here

Bigger

Same

Smaller

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The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

Short circuited

None of the listed here

Open circuited

Supplying a variable resistive load

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At starting of a double squirrel cage induction motor _______

Lower winding is more effective

Outer cage winding has good pf

Lower cage winding has low reactance

None of the listed here

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The low power factor of induction motor is due to

The reactive lagging magnetizing current necessary to generate the magnetic flux

Rotor leakage reactance

All of these

Stator reactance

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3-phase wound rotor morors are also called _____ motors.

Series

Slip ring

Commutator

Synchronous

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The stator of a three phase induction motor produces _______ magnetic field.

Alternating

Steady

Rotating

None of the listed here

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The number of slip rings on a squirrel cage induction motor is usually

One

Two

Three

None

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The complete circle diagram of induction motor can be drawn with the help of data found from

No-load test

Stator resistance test

Blocked rotor test

All of these

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If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

(1+S) × rotor input

S × rotor input

None of the listed here

(1-S) × rotor input

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