Explanation: The direction of rotating MMF wave is reversed, though its amplitude remains unaltered. 6. The rotating MMF wave of constant amplitude can be produced, only if the time angle displacement between currents is _____________
A. Less than the space angle displacement between winding axis
B. More than the space angle displacement between winding axis
C. Equal to the space angle displacement between winding axis
D. Any of the mentioned
Answer:A
Explanation: The direction of rotating MMF wave is reversed, though its amplitude remains unaltered. 6. The rotating MMF wave of constant amplitude can be produced, only if the time angle displacement between currents is _____________
A. Less than the space angle displacement between winding axis B. More than the space angle displacement between winding axis C. Equal to the space angle displacement between winding axis D. Any of the mentioned
Explanation: If the time angle displacement between currents and space angle displacement between winding axis are not equal, the magnitude of resultant MMF wave is always zero. 7. A 3 phase star connected winding is fed from symmetrical 3 phase supply with their neutrals connected together. If one of the 3 supply lines gets disconnected, then the revolving MMF wave will have a ___________