A) armature core material should have high hysteresis coefficient B) armature core material should have low hysteresis coefficient C) stator should be laminated D) armature core should be laminated. Ans : (B)
A) Eddy current loss B) Hysteresis loss C) Copper loss D) All of the above. And : (C)
A) 75 % B) 50 % C) 25 % D) 0 %. Ans : (B)
A) Eddy current loss B) Hysteresis loss C) Copper loss D) Friction loss. Ans : (A)
A) 65 % B) 85 % C) 95 % D) 99 %. Ans : (C)
A) Windage losses B) Eddy current losses C) Hysteresis losses D) Copper losses. Ans : (A)
A) 100 B) 50 C) 10 D) 5. Ans : (D)
A) constant losses = variable losses B) constant losses = losses proportional to square of the current C) core gets fully saturated D) machine is running at no load. Ans : (B)
A) yf + yb = yc B) yf - yb = yc C) yb - yf = yc D) yf + yb = 2yc. Ans : (D)
A) 1 Hz square wave B) 1 Hz sinusoidal C) zero D) non-pulsating dc voltage of rms value unity. Ans : (B)