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Three Phase Induction Motors

Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Partly star and partly delta
None of the listed here
Delta
Star

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

Increased at starting
Decreased at starting
None of the listed here
Increased under running conditions

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

None of the listed here
20 to 30 %
2 to 5 %
10 to 20 %

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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

1.5 Hz
2.5 Hz
5 Hz
0.05 Hz

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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
The frame of an induction motor is usually made of

Silicon steel
Bronze
Aluminium
Cast iron

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