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Three Phase Induction Motors

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

Any of the listed here
Flexible
Hollow
Stiff

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

None of the listed here
Practically zero
Large
Small

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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

5 Hz
2.5 Hz
1.5 Hz
0.05 Hz

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

Cast iron
Bronze
Aluminium
Silicon steel

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

15 to 20 %
10 to 15%
30 to 50%
5%

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Frequency
Rotor inductive reactance
All of the listed here
Square of supply voltage

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