AC THREE PHASE MOTOR - Quiz

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

Empire Cotton Bamboo Terylene

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

Ground test Polarity test Open circuit test Short circuit 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

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

Iron loss Copper loss Friction loss Windage 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