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Three Phase Induction Motors

Three Phase Induction Motors
The shaft of an induction motor is made of

High speed steel
Stainless steel
Carbon steel
Cast iron

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

None of the listed here
Steady
Alternating
Rotating

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Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Series
Commutator
Synchronous

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1/S
1-S
S
S/1-S

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

10 to 20 %
20 to 30 %
None of the listed here
2 to 5 %

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Auto transformer starter
Proper ventilation
Having number of rotor slots more or less than the number of stator slots
Using DOL starter

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