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Three Phase Induction Motors

Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Smaller than
None of the listed here
Equal to
Greater than

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

Lower winding is more effective
None of the listed here
Outer cage winding has good pf
Lower cage winding has low reactance

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor power factor
Shaft diameter
Rotor current
Rotor emf

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

Series
Slip ring
Synchronous
Commutator

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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
The no load speed of an induction motor depends on

The number of its poles
The maximum flux/poles
Both supply frequency and number of poles
The supply frequency

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