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Three Phase Induction Motors

Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
1+S
S-1
1-S

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

None of the listed here
Stator slots are exact multiple of rotor slots
Stator slots are not exact multiple of rotor slots
Stator slots are equal to rotor slots

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Three Phase Induction Motors
The induction motor has lagging power factor during

None of the listed here
Both starting and operation
Operation only
Starting only

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Eddy currents
Self induction
Hysteresis
Mutual induction

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Three Phase Induction Motors
Reduced voltage starter can be used with

Squirrel cage as well as slip ring induction motor
Slip ring motor only but not with squirrel cage induction motor
None of these
Squirrel cage induction motor only but not with slip ring motor

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Three Phase Induction Motors
Slip rings are usually made of

Carbon
Phospor bronze
Aluminium
Copper

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