A) synchronous motor B) wound rotor induction motor C) squirrel cage induction motor D) any of the above. Ans : (A)
A) the motor will stop B) the motor will run C) the motor will run at synchronous speed D) the motor will run at less than synchronous speed. Ans : (C)
A) reduce bearing friction B) eliminate losses on account of air friction C) reduce windage losses D) eliminate hunting and provide adequate starting torque. Ans : (D)
A) synchronous condenser B) spinning motor C) synchronous induction motor D) none of the above. Ans : (A)
A) changing the applied voltage B) interchanging any two phases C) changing the load D) changing the frequency of supply. Ans : (D)
A) magnetizing B) demagnetizing C) cross-magnetizing D) none of the above. Ans : (A)
A) The stator mmf rotates slightly faster than rotor mmf B) The rotor mmf rotates slightly faster in comparison to stator mmf C) The rotor mmf and stator mmf are stationary with respect to each other D) None of the above. Ans : (C)
A) the angle between the rotating stator flux and rotor poles B) the angle between magnetizing current and back emf C) the angle between the supply voltage and the back emf D) none of the above. Ans : (A)
A) very high B) very low C) zero D) 100 %. Ans : (B)
A) on high load and variable supply voltage B) on pulsating load C) on constantly varying load D) on no load and without losses. Ans : (D)