The speed of an alternator is changed from 3000 r.p.m. to 1500 r.p.m. The generated e.m.f./phase will become
A. one fourth
B. half
C. double
D. unchanged
Answer:B
The speed of an alternator is changed from 3000 r.p.m. to 1500 r.p.m. The generated e.m.f./phase will become
A. one fourth B. half C. double D. unchanged