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Three Phase Induction Motors

Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Line voltage
Rotor current
Running torque
Slip

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

Both squirrel cage and slip ring
None of the listed here
Squirrel cage induction motor
Slip ring induction motor

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

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

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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
1 cm to 2 cm
2 cm to 4 cm
4 cm to 6 cm

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

Hysteresis
Mutual induction
Eddy currents
Self induction

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

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

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