THREE PHASE INDUCTION MOTORS QUIZ

The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Delta

None of the listed here

Star

Partly star and partly delta

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In medium sized induction motor, the slip is generally around

4 %

0.4 %

14%

0.04 %

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If any two phases for an induction motor are interchanged

The motor will run at reduced speed

The motor will run in reverse direction

The motor will not run

The motor will burn

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A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor resistance

Increasing rotor reactance

Decreasing rotor resistance

None of the listed here

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The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

High reactance

Low resistance

high resistance

Large slip

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One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm

2400 rpm

400 rpm

1600 rpm

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The term cogging is associated with

Compound generators

Induction motors

Dc series motors

Three phase transformer

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

None of the listed here

Steady

Rotating

Alternating

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In an induction motor, no load the slip is generally

1.5 %

Less than 1%

2%

4%

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The rotor of an induction motor runs at

Below synchronous speed

Above synchronous speed

Synchronous speed

Any of the above

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