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Three Phase Induction Motors

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

Commutator
Slip ring
Series
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

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

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

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

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

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

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Uniform torque
Less rotor losses
None of the listed here
Greater mechanical strength

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

None of the listed here
Leakage reactances are decreased
No load current is decreased
Leakage reactances are increased

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