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 Auto transformer starter Using DOL starter Proper ventilation Having number of rotor slots more or less than the number of stator slots Auto transformer starter Using DOL starter Proper ventilation ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current. 5% 30 to 50% 10 to 15% 15 to 20 % 5% 30 to 50% 10 to 15% 15 to 20 % ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors At no load the rotor core loss of a 3 phase induction motor is Practically zero Large None of the listed here Small Practically zero Large None of the listed here Small 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 ______ 40% 90% None of the listed here 65% 40% 90% None of the listed here 65% ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The speed of a squirrel cage induction motor is changed by Cascade control Rheostatic control Pole changing None of the listed here Cascade control Rheostatic control Pole changing None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A 3 phase induction motor is ________ A variable speed motor Very costly Not easily maintainable Essentially a constant speed motor A variable speed motor Very costly Not easily maintainable Essentially a constant speed motor ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS