The series parallel system of speed control of D.C. series motors widely used in traction work gives a speed range of about
A. 1:10
B. 1 : 8
C. 1: 8
D. 1 : 4
Answer:D
The series parallel system of speed control of D.C. series motors widely used in traction work gives a speed range of about
A. 1:10 B. 1 : 8 C. 1: 8 D. 1 : 4