Three Phase Induction Motors The speed of a squirrel-cage induction motor can be controlled by all of the following except Changing number of poles Changing supply frequency Changing winding resistance Reducing supply voltage Changing number of poles Changing supply frequency Changing winding resistance Reducing supply voltage ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The torque developed in the cage induction motor with auto-starter is K2 × torque with direct switching k/torque with direct switching K × torque with direct switching k2/torque with direct switching K2 × torque with direct switching k/torque with direct switching K × torque with direct switching k2/torque with direct switching ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors In an induction motor if air gap increased The power factor will be low Windage losses will be more Copper loss will reduce Bearing friction will reduce The power factor will be low Windage losses will be more Copper loss will reduce Bearing friction will reduce ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to None of the listed here (1-S) × rotor input (1+S) × rotor input S × rotor input None of the listed here (1-S) × rotor input (1+S) × rotor input S × rotor input ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The number of slip rings on a squirrel cage induction motor is usually One None Two Three One None Two Three 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 remains same Rotor current becomes zero Decreases the rotor current Increases the rotor current Rotor current remains same Rotor current becomes zero ANSWER DOWNLOAD EXAMIANS APP
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