Three Phase Induction Motors The maximum torque of a 3-phase induction motor under running conditions is Directly proportional to rotor resistance Inveresly proportional to supply voltage None of the listed here inversely proportional to rotor reactance at standstill Directly proportional to rotor resistance Inveresly proportional to supply voltage None of the listed here inversely proportional to rotor reactance at standstill ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A high starting torque can be obtained in a 3phase induction motor by _______ Increasing rotor resistance None of the listed here Increasing rotor reactance Decreasing rotor resistance Increasing rotor resistance None of the listed here Increasing rotor reactance Decreasing rotor resistance 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 An induction motor is preferred to a dc motor because it _______ None of the listed here Has simple and rugged construction Provides fine speed control Provides high starting torque None of the listed here Has simple and rugged construction Provides fine speed control Provides high starting torque ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The power factor of an induction motor under no load conditions will be closer to 0.2 lagging 0.5 leading Unity 0.2 leading 0.2 lagging 0.5 leading Unity 0.2 leading ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The efficiency of an induction motor can be expected to be nearly 95 to 98 % 60 to 90% 80 to 90% 99% 95 to 98 % 60 to 90% 80 to 90% 99% ANSWER DOWNLOAD EXAMIANS APP
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