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? 1440 rpm 730 rpm 2880 rpm 1000 rpm 1440 rpm 730 rpm 2880 rpm 1000 rpm ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors An induction motor is preferred to a dc motor because it _______ Provides high starting torque Has simple and rugged construction Provides fine speed control None of the listed here Provides high starting torque Has simple and rugged construction Provides fine speed control None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors At no load the rotor core loss of a 3 phase induction motor is Small None of the listed here Large Practically zero Small None of the listed here Large Practically zero ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors In an induction motor if air gap increased Bearing friction will reduce Copper loss will reduce Windage losses will be more The power factor will be low Bearing friction will reduce Copper loss will reduce Windage losses will be more The power factor will be low 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 ______ 90% 65% 40% None of the listed here 90% 65% 40% None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____ 300 rpm 600 rpm 1200 rpm 1000 rpm 300 rpm 600 rpm 1200 rpm 1000 rpm ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS