AC THREE PHASE MOTOR - Practice Mode

1) Which material is used as wedges in winding process?

Empire Cotton Bamboo Terylene

Correct Answer: Bamboo

2) Which test in winding is essential before giving supply?

Ground test Polarity test Open circuit test Short circuit test

Correct Answer: Polarity test

3) Why the rotor bars are mounted in a slightly skewed position in 3 phase motor

Generate maximum flux Reduce the stray losses Maintain the rotor speed constant Produce more uniform rotor field and torque

Correct Answer: Produce more uniform rotor field and torque

4) Which loss is determined by no load test of 3 phase induction motor?

Iron loss Copper loss Friction loss Windage loss

Correct Answer: Iron loss

5) Which method of speed control two variable speeds only obtained in 3 phase motor?

By rotor rheostat control By changing applied frequency By changing the applied voltage By changing the number of stator poles

Correct Answer: By changing the number of stator poles

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