Three Phase Induction Motors A high starting torque can be obtained in a 3phase induction motor by _______ Increasing rotor reactance Decreasing rotor resistance Increasing rotor resistance None of the listed here Increasing rotor reactance Decreasing rotor resistance Increasing rotor resistance 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 frequency as the slip frequency Zero frequency The same phase as the rotor e.m.f. High value for the satisfactory speed control The same frequency as the slip frequency Zero frequency The same phase as the rotor e.m.f. ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The no load speed of an induction motor depends on Both supply frequency and number of poles The maximum flux/poles The supply frequency The number of its poles Both supply frequency and number of poles The maximum flux/poles The supply frequency The number of its poles ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The maximum torque of a 3-phase induction motor under running conditions is None of the listed here Directly proportional to rotor resistance Inveresly proportional to supply voltage inversely proportional to rotor reactance at standstill None of the listed here Directly proportional to rotor resistance Inveresly proportional to supply voltage inversely proportional to rotor reactance at standstill ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______ Greater mechanical strength None of the listed here Uniform torque Less rotor losses Greater mechanical strength None of the listed here Uniform torque Less rotor losses ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors Insertion of resistance in the rotor of an induction motor to develop a given torque Decreases the rotor current Increases the rotor current Rotor current becomes zero Rotor current remains same Decreases the rotor current Increases the rotor current Rotor current becomes zero Rotor current remains same ANSWER DOWNLOAD EXAMIANS APP
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