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Three Phase Induction Motors

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

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

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

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

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

All of the listed here
Square of supply voltage
Frequency
Rotor inductive reactance

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

High speed steel
Stainless steel
Cast iron
Carbon steel

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Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

0.4 mm to 4 mm
4 cm to 6 cm
2 cm to 4 cm
1 cm to 2 cm

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
Minimum at no load
Remains the same at all loads
None of the listed here

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