A) 15 A B) 35 A C) 60 A D) 100 A. Ans : (B)
A) cannot be controlled by diverter B) can be controlled by shunt field regulator C) increases as armature circuit resistance increases D) increases as flux decreases. Ans : (D)
A) cooling air B) defective bearing C) magnetic effect D) all of the above. Ans : (D)
A) 736 rpm B) 768 rpm C) 864 rpm D) 832 rpm. Ans : (C)
A) 100% B) 90 to 95% C) 81% D) Less than 50%. Ans : (D)
A) always constant B) directly proportional to back e.m.f. C) directly proportional to flux D) inversely proportional to the product of back e.m.f. and flux. Ans : (B)
A) shunt motors B) series motors C) compound motors D) none. Ans : (A)
A) stray losses B) eddy current losses C) hysteresis losses D) all of the above. Ans : (A)
A) shunt motor B) series motor C) differentially compound motor D) cumulatively compound motor. Ans : (C)
A) shunt motor B) series motor C) separately excited motor D) cumulatively compound motors. Ans : (B)