THREE PHASE INDUCTION MOTORS QUIZ

Which of the following component is usually fabricated out of silicon steel?

Stator core

None of these

Bearings

Shaft

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The advantage of wound rotor motor is that _______

It requires less maintenance

None of the listed here

External resistance can be inserted in the rotor circuit

It is inexpensive

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The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing number of poles

Changing winding resistance

Reducing supply voltage

Changing supply frequency

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Insertion of resistance in the rotor of an induction motor to develop a given torque

Rotor current remains same

Increases the rotor current

Decreases the rotor current

Rotor current becomes zero

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The shaft of induction motor is made of

Flexible

Stiff

Hollow

Any of the listed here

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In a double squirrel cage induction motor, the outer cage winding has _______

None of the listed here

High inductance

High resistance

Low resistance

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A wound rotor motor is mainly used in applications where ______

High starting torque is required

Speed control is required

High rotor resistance is required during running

Less costly motor is not required

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If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

60 Hz

None of the listed here

50 Hz

25 Hz

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A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

200 W

980 W

20 W

500 W

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The condition of induction motor on load resemble those of a transformer whose secondady is _______

Open circuited

Supplying a variable resistive load

Short circuited

None of the listed here

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