Three Phase Induction Motors The injected e.m.f. in the rotor of induction motor must have 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 The same frequency as the slip frequency ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors Slip rings are usually made of Phospor bronze Carbon Copper Aluminium Phospor bronze Carbon Copper Aluminium ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A four speed squirrel cage induction motor uses______ stator windings. Four Three One Two Four Three One Two ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors For higher efficiency of 3-phase induction motor, the slip should be Very large As small as possible 1 Large Very large As small as possible 1 Large 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. 10 to 15% 30 to 50% 15 to 20 % 5% 10 to 15% 30 to 50% 15 to 20 % 5% ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors Very large 3-phase induction motors (greater than 25 HP) are started _____ None of the listed here Direct on line Star-delta starting By auto transformer starting None of the listed here Direct on line Star-delta starting By auto transformer starting ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS