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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 ______

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

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

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

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Three Phase Induction Motors
The shaft of an induction motor is made of

Cast iron
High speed steel
Carbon steel
Stainless steel

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

All of these
Stator resistance test
No-load test
Blocked rotor test

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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_______

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

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

80 to 90%
95 to 98 %
99%
60 to 90%

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