A) Full pitch coil B) Short pitch coil C) Long pitch coil D) Equal emf will be generated in all cases. Ans : (A)
A) 3 phase, 400 V, 50/60 Hz, 0.8 pf leading, 1500 rpm B) 3 phase, 400 V, 50/60 Hz, 0.8 pf lagging, 1500 rpm C) 3 phase, 400 V, 50 Hz, 0.8 pf leading, 1500 rpm D) 3 phase, 400 V, 50 Hz, 0.8 pf lagging, 1500 rpm. Ans : (D)
A) unity B) lagging C) leading D) more than unity. Ans : (C)
A) remains stationary with respect to rotor B) remains stationary with respect to stator C) rotates at synchronous speed with direction of rotation of the rotor D) rotates at synchronous speed with respect to stator. Ans : (B)
A) 10 HP, 375 rpm B) 10 HP, 500 rpm C) 5 HP, 375 rpm D) 5 HP, 500 rpm. Ans : (C)
A) the motor will stop B) the winding will get overheated C) the motor will run as reluctance motor at the rated rpm D) the motor will run as reluctance motor at lower rpm. Ans : (A)
A) equal to synchronous speed B) more than the speed of rotating magnetic field C) less than the speed of rotating magnetic field D) zero. Ans : (D)
A) windage friction B) variable supply voltage C) variable load D) variable frequency. Ans : (A)
A) varies with power factor B) remains constant at all loads C) varies with load D) varies with speed. Ans : (B)
A) simplex rotor B) phase wound damper C) five slip rings D) all of the above. Ans : (D)