Three Phase Induction Motors The injected e.m.f. in the rotor of induction motor must have 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. High value for the satisfactory speed control The same frequency as the slip frequency Zero frequency ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors At starting of a double squirrel cage induction motor _______ Lower winding is more effective None of the listed here Lower cage winding has low reactance Outer cage winding has good pf Lower winding is more effective None of the listed here Lower cage winding has low reactance Outer cage winding has good pf ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors An induction motor is so called because its operation depends on Self induction Hysteresis Mutual induction Eddy currents Self induction Hysteresis Mutual induction Eddy currents ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors In a double squirrel cage induction motor, the outer cage winding has _______ High resistance None of the listed here Low resistance High inductance High resistance None of the listed here Low resistance High inductance ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The advantage of wound rotor motor is that _______ It requires less maintenance None of the listed here It is inexpensive External resistance can be inserted in the rotor circuit It requires less maintenance None of the listed here It is inexpensive External resistance can be inserted in the rotor circuit 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 winding resistance Changing supply frequency Changing number of poles Reducing supply voltage Changing winding resistance Changing supply frequency Changing number of poles Reducing supply voltage ANSWER DOWNLOAD EXAMIANS APP
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