Three Phase Induction Motors The injected e.m.f. in the rotor of induction motor must have The same frequency as the slip frequency The same phase as the rotor e.m.f. Zero frequency High value for the satisfactory speed control The same frequency as the slip frequency The same phase as the rotor e.m.f. Zero frequency High value for the satisfactory speed control ANSWER DOWNLOAD EXAMIANS APP
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 Infinity Small Large Absent ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The condition of induction motor at no load resemble those of a transformer whose secondady is _______ Supplying a variable resistive load Open circuited Short-circuited None of the listed here Supplying a variable resistive load Open circuited Short-circuited None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The induction motor has lagging power factor during Both starting and operation Starting only None of the listed here Operation only Both starting and operation Starting only None of the listed here Operation only ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The crawling in an induction motor is caused by Harmonics developed in the rotor Improper design of machine High loads Low voltage supply Harmonics developed in the rotor Improper design of machine High loads Low voltage supply ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors At starting of a double squirrel cage induction motor _______ Lower winding is more effective None of the listed here Outer cage winding has good pf Lower cage winding has low reactance Lower winding is more effective None of the listed here Outer cage winding has good pf Lower cage winding has low reactance ANSWER DOWNLOAD EXAMIANS APP
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