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Three Phase Induction Motors

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

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

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

Rotor current
Shaft diameter
Rotor emf
Rotor power factor

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Silicon steel
Cast iron
Aluminium
Bronze

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

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Increased two times
Decreased four times
Increased four times
Decreased two times

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Three Phase Induction Motors
The rotor of induction motor

None of the listed here
Always revolves in the direction of stator flux
Insufficient data
Always revolves in the direction opposite to stator flux

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