A) 60 % B) 50 % C) 25 % D) 5 %. Ans : (D)
A) Loss of efficiency B) Excessive heating of core C) (A) and (B) above D) None of the above. Ans : (C)
A) Frequency of magnetic reversals B) Maximum value of flux density C) Volume and grade of iron D) All of the above. Ans : (D)
A) 2 a p B) a p C) 2 a D) 2 Ans : (D)
A) Same drooping voltage characteristic B) Same speeds at on load as well as full loads C) Same percentage regulation D) Same kilowatt output ratings. Ans : (A)
A) fractional B) odd or even C) even D) odd. Ans : (B)
A) Constant current B) Constant load C) Constant speed D) Constant torque. Ans : (D)
A) Wave winding B) Lap winding C) Any of the above. Ans : (A)
A) B3.2 B) B2 C) B1.6 D) B Ans : (B)
A) To filter out harmonics B) To prevent flow of circulating current through the brushes C) To improve commutation D) To decrease armature reaction. Ans : (B)