Explanation: A reversal of the phase sequence of supply currents will reverse the direction of rotation of the resultant MMF wave. 6. Which of the following statements are correct regarding individual phase MMF in rotating machines ?
A. It is a rotating MMF wave
B. It is not a rotating MMF wave and its amplitude doesn’t alternate along its own phase axis
C. It is not a rotating MMF wave but its amplitude merely pulsates
D. None of the mentioned
Answer:A
Explanation: A reversal of the phase sequence of supply currents will reverse the direction of rotation of the resultant MMF wave. 6. Which of the following statements are correct regarding individual phase MMF in rotating machines ?
A. It is a rotating MMF wave B. It is not a rotating MMF wave and its amplitude doesn’t alternate along its own phase axis C. It is not a rotating MMF wave but its amplitude merely pulsates D. None of the mentioned
Explanation: It should be remembered that individual phase MMF is not a rotating MMF wave, its amplitude merely pulsates or alternates along its own phase axis. 7. The effect of poly phase currents in poly phase winding can be compared to _______________