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Three Phase Induction Motors

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

200 Hz
2 Hz
20 Hz
50 Hz

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Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

S-1
1-S
None of the listed here
1+S

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Frequency
Rotor inductive reactance
Square of supply voltage
All of the listed here

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor power factor
Shaft diameter
Rotor current
Rotor emf

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Infinity
Small
Large
Absent

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Three Phase Induction Motors
An induction motor is

Self starting with low torque
Self starting with zero torque
Self starting with high torque
Non self starting

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