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Three Phase Induction Motors

Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.4 %
0.04 %
4 %
14%

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

Smaller than
Equal to
Greater than
None of the listed here

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Decreases the rotor current
Rotor current becomes zero
Rotor current remains same
Increases the rotor current

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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
0.05 Hz
5 Hz

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Three Phase Induction Motors
The shape of the torque/slip curve of induction motor is

Rectangular parabola
Hyperbola
Parabola
Straight line

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