The efficiency of a dc series machine cannot be determined by Swinburne’s test as
A. a series motor has very high starting torque.
B. a series motor draws excessive current from the supply mains on no load.
C. a series motor runs at dangerously high speed on no load.
D. all of the above.
Answer:C
The efficiency of a dc series machine cannot be determined by Swinburne’s test as
A. a series motor has very high starting torque. B. a series motor draws excessive current from the supply mains on no load. C. a series motor runs at dangerously high speed on no load. D. all of the above.