Three Phase Induction Motors The injected e.m.f. in the rotor of induction motor must have 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. High value for the satisfactory speed control The same frequency as the slip frequency ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The good power factor of an induction motor can be achieved if the average flux density in the air gap is Absent Large Infinity Small Absent Large Infinity Small ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors An induction motor is so called because its operation depends on Hysteresis Mutual induction Eddy currents Self induction Hysteresis Mutual induction Eddy currents Self induction ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The air gap between stator and rotor of 3-phase induction motor ranges from ______ 4 cm to 6 cm 1 cm to 2 cm 0.4 mm to 4 mm 2 cm to 4 cm 4 cm to 6 cm 1 cm to 2 cm 0.4 mm to 4 mm 2 cm to 4 cm ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors Slip of an induction motor is negative when Rotor speed is less than the synchronous speed of the field and are in the same direction Magnetic field and rotor rotate in opposite direction Rotor speed is more than the synchronous speed of the field and are in the same direction None of these Rotor speed is less than the synchronous speed of the field and are in the same direction Magnetic field and rotor rotate in opposite direction Rotor speed is more than the synchronous speed of the field and are in the same direction None of these 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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