Three Phase Induction Motors The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______ 65% None of the listed here 40% 90% 65% None of the listed here 40% 90% ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be 20 Hz 200 Hz 2 Hz 50 Hz 20 Hz 200 Hz 2 Hz 50 Hz ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The condition of induction motor at stand still resemble those of a transformer whose secondady is _______ None of the listed here Open circuited Short circuited Supplying a variable resistive load None of the listed here Open circuited Short circuited Supplying a variable resistive load ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors An induction motor is preferred to a dc motor because it _______ Has simple and rugged construction Provides high starting torque None of the listed here Provides fine speed control Has simple and rugged construction Provides high starting torque None of the listed here Provides fine speed control ANSWER DOWNLOAD EXAMIANS APP
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 The full load slip of a 3-phase induction motor ranges from 20 to 30 % None of the listed here 2 to 5 % 10 to 20 % 20 to 30 % None of the listed here 2 to 5 % 10 to 20 % ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS