Three Phase Induction Motors The rotor of induction motor Always revolves in the direction of stator flux Insufficient data Always revolves in the direction opposite to stator flux None of the listed here Always revolves in the direction of stator flux Insufficient data Always revolves in the direction opposite to stator flux None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to S × rotor input None of the listed here (1-S) × rotor input (1+S) × rotor input S × rotor input None of the listed here (1-S) × rotor input (1+S) × rotor input ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The efficiency of an induction motor can be expected to be nearly 99% 60 to 90% 80 to 90% 95 to 98 % 99% 60 to 90% 80 to 90% 95 to 98 % ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The cogging of an induction motor can be avoided by Having number of rotor slots more or less than the number of stator slots Proper ventilation Using DOL starter Auto transformer starter Having number of rotor slots more or less than the number of stator slots Proper ventilation Using DOL starter Auto transformer starter ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be 50 Hz 20 Hz 200 Hz 2 Hz 50 Hz 20 Hz 200 Hz 2 Hz ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______ None of the listed here 90% 65% 40% None of the listed here 90% 65% 40% ANSWER DOWNLOAD EXAMIANS APP
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