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THREE PHASE INDUCTION MOTORS

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

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Rectangular parabola
Parabola
Hyperbola
Straight line

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Three Phase Induction Motors
In an induction motor if air gap increased

Copper loss will reduce
Windage losses will be more
Bearing friction will reduce
The power factor will be low

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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 emf
Rotor current

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

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

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