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Three Phase Induction Motors

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

Silicon steel
Bronze
Cast iron
Aluminium

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

200 W
500 W
980 W
20 W

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

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

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

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Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
1600 rpm
2400 rpm
400 rpm

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

No load current is decreased
Leakage reactances are decreased
Leakage reactances are increased
None of the listed here

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