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Three Phase Induction Motors

Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

1
0.2
0.5
Practically zero

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

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

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Three Phase Induction Motors
Which of the following component is usually fabricated out of silicon steel?

Shaft
Bearings
Stator core
None of these

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

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

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Rotor current
Slip
Line voltage
Running torque

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

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

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