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Three Phase Induction Motors

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

Hyperbola
Parabola
Straight line
Rectangular parabola

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Three Phase Induction Motors
The maximum torque of a 3-phase induction motor under running conditions is

None of the listed here
Directly proportional to rotor resistance
inversely proportional to rotor reactance at standstill
Inveresly proportional to supply voltage

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

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

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

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

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

50 Hz
2 Hz
20 Hz
200 Hz

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Three Phase Induction Motors
The term cogging is associated with

Compound generators
Induction motors
Three phase transformer
Dc series motors

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