A) armature current and field current B) power factor and speed C) field current and power factor D) field current and speed. Ans : (A)
A) load is constant B) load is variable C) airgap is less D) friction in bearings is more. Ans : (B)
A) Copper losses B) Hysteresis losses C) Winding losses D) None of the above. Ans : (C)
A) 45o B) less than 90o C) 90o D) more than 90o. Ans : (B)
A) motor is overloaded B) motor is underloaded C) unbalanced voltage is supplied D) motor armature is hot. Ans : (C)
A) Iron losses B) Eddy current losses C) Friction and windage losses D) Stator copper losses. Ans : (A)
A) Iron losses in the stator B) Windage losses C) Eddy current losses in the conductors D) Copper losses in the slot portion of the conductors. Ans : (B)
A) stator winding will burn B) motor will not run C) motor will rotate at synchronous speed on light load D) motor will rotate at a speed which is less than the synchronous speed. Ans : (D)
A) the motor will run in the reverse direction B) the motor will continue to run in the same direction C) the motor will stop D) the winding of the motor will burn. Ans : (B)
A) zero B) 0.4 % C) 1 % D) 5 %. Ans : (A)