Top 350+ Solved Electrical Machine 1 MCQ Questions Answer
Q. The main disadvantage of the Ward-Leonard control method is
a. high initial cost
b. high maintenance cost
c. low efficiency at Hght loads
d. all of the above
Q. Regenerative method of braking is based on that
a. back e.m.f. is less than the applied voltage
b. back e.m.f. is equal to the applied voltage
c. back e.m.f. of rotor is more than the applied voltage
d. none of the above
Q. The hysteresis loss in a D.C. machine least depends on
a. Frequency of magnetic reversals
b. Maximum value of flux density
c. Volume and grade of iron
d. Rate of flow of ventilating air
Q. In a D.C. generator all of the following could be the effects of iron losses except
a. Loss of efficiency
b. Excessive heating of core
c. Increase in terminal voltage
d. Rise in temperature of ventilating air
Q. The losses occurring in a D.C. generator are given below. Which loss is likely to havehighest proportion at rated load of the generator ?
a. hysteresis loss
b. field copper loss
c. armature copper loss
d. eddy current loss