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Three Phase Induction Motors

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

Running torque
Slip
Rotor current
Line voltage

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

90%
40%
65%
None of the listed here

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Self induction
Hysteresis
Eddy currents

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

Bronze
Silicon steel
Aluminium
Cast iron

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

More than
Less than
About the same
None of the listed here

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

External resistance can be inserted in the rotor circuit
It is inexpensive
It requires less maintenance
None of the listed here

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