The main disadvantage of Hopkinson’s test for finding efficiency of the shunt D.C. motors is that it
A. needs one motor and one generator
B. require two identical shunt machines
C. requires full-load power
D. ignores any change in iron loss
Answer:B
The main disadvantage of Hopkinson’s test for finding efficiency of the shunt D.C. motors is that it
A. needs one motor and one generator B. require two identical shunt machines C. requires full-load power D. ignores any change in iron loss