Three Phase Induction Motors 5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest? 730 rpm 1440 rpm 2880 rpm 1000 rpm 730 rpm 1440 rpm 2880 rpm 1000 rpm 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 ______ 65% 40% 90% None of the listed here 65% 40% 90% None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The injected e.m.f. in the rotor of induction motor must have High value for the satisfactory speed control The same phase as the rotor e.m.f. The same frequency as the slip frequency Zero frequency High value for the satisfactory speed control The same phase as the rotor e.m.f. The same frequency as the slip frequency Zero frequency ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The speed of a squirrel-cage induction motor can be controlled by all of the following except Changing supply frequency Changing number of poles Reducing supply voltage Changing winding resistance Changing supply frequency Changing number of poles Reducing supply voltage Changing winding resistance ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A four speed squirrel cage induction motor uses______ stator windings. One Three Four Two One Three Four Two ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors In induction motor, percentage slip depends on Supply frequency Supply voltage Copper losses in motor None of these Supply frequency Supply voltage Copper losses in motor None of these ANSWER DOWNLOAD EXAMIANS APP
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