Which of the above statements are correct?
A. (ii) only
B. (iii) only
C. (i) and (iv)
D. (ii) and (iii)
Answer:A
Which of the above statements are correct?
A. (ii) only B. (iii) only C. (i) and (iv) D. (ii) and (iii)
Explanation: In a DC machine, armature current doesn’t vary with time. Therefore, the armature MMF wave for a DC machine remains constant in amplitude and doesn’t depends on the armature speed. Hence the armature MMF wave is stationary with respect to stator and armature. Sanfoundry Global Education & Learning Series – Electrical Machines.