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Induction Motor Starting Quiz

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Questions and Answers

What is the starting current of an induction motor at the time of starting?

200% to 350% of the full-load current

400% to 800% of the full-load current (correct)

Less than 100% of the full-load current

Equal to the full-load current

What is the relationship between the effective rotor resistance at starting and at rated slip?

R2 is negligible at starting

R2 is greater at starting compared to its value at rated slip, R2/s

R2 is very small at starting compared to its value at rated slip, R2/s (correct)

R2 is equal at starting and at rated slip

What may be affected by excessive line voltage drop due to high starting current?

Starting torque

Rotor speed

Operation of other machines on the same power source (correct)

Motor efficiency

What is independent of the rotor resistance in an induction motor?

<p>Maximum torque developed by the motor (C)</p> Signup and view all the answers

What determines the starting torque of an induction motor?

<p>~ I2s  V1 R e  jX e equation from the approximate equivalent circuit (B)</p> Signup and view all the answers