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

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

Straight line
Rectangular parabola
Hyperbola
Parabola

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

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

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

Rotor power factor
Rotor current
Rotor emf
Shaft diameter

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

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

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