A) Induction motor B) Synchronous motor C) Reluctance motor D) Universal motor. Ans : (B)
A) normal load with minimum excitation B) normal load with zero excitation C) no load and under-excited fields D) no load and greatly over-excited fields. Ans : (D)
A) 0 B) 0.5 C) 1.0 D) infinite. Ans : (A)
A) hysteresis type machines B) salient pole type machines C) cylindrical pole type machines D) induction type machines. Ans : (B)
A) zero B) low C) high D) high and low. Ans : (D)
A) lower stability limit B) higher stability limit C) good voltage regulation D) good speed regulation. Ans : (A)
A) equal to the supply voltage B) less than the supply voltage C) more than the supply voltage. Ans : (C)
A) Direction of rotation B) Supply voltage C) Rotor excitation D) Maximum value of coupling angle. Ans : (A)
A) decrease in back emf B) change in supply voltage C) the stator magnetic field D) rotor taking new angular position slightly back of its no load position. Ans : (D)
A) The speed varies directly only in proportion to the number of its poles B) The speed is independent of the frequency of the voltage supply C) The speed depends on the frequency of the voltage supply and the number of its poles D) The speed depends on the magnitude of the voltage supply and the number of its poles. Ans : (C)