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Three Phase Induction Motors

Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

Smaller than
Greater than
None of the listed here
Equal to

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

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

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

60 Hz
None of the listed here
25 Hz
50 Hz

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

0.05 Hz
5 Hz
1.5 Hz
2.5 Hz

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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

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

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Directly proportional to
Independent of
None of the listed here
Directly proportional to sqaure of

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