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Three Phase Induction Motors

Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

300 rpm
1200 rpm
1000 rpm
600 rpm

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

Shaft diameter
Rotor power factor
Rotor emf
Rotor current

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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 ______

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

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

Less than
None of the listed here
More than
About the same

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Same as full load torque
Low
Negligible
Slightly more than full load torque

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High resistance
None of the listed here
Low resistance
High inductance

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