Explanation: In general m phase current flowing in m phase winding results in rotating MMF wave of constant amplitude, equal to m/(2Fm). 4. The peak of rotating MMF wave (FR) is directed along which of the following axis?
A. The axis of that phase which carries the maximum current at that instant
B. The axis of that phase which carries half of the maximum current at that instant
C. The axis of that phase which carries minimum current at that instant
D. Any of the mentioned
Answer:A
Explanation: In general m phase current flowing in m phase winding results in rotating MMF wave of constant amplitude, equal to m/(2Fm). 4. The peak of rotating MMF wave (FR) is directed along which of the following axis?
A. The axis of that phase which carries the maximum current at that instant B. The axis of that phase which carries half of the maximum current at that instant C. The axis of that phase which carries minimum current at that instant D. Any of the mentioned
Explanation: The resultant MMF FR = 3/(2Fm) is directed along the axis of that phase, which carries the maximum current at that instant. 5. If the phase sequence of supply currents are reversed, then the direction of rotation of the resultant MMF wave will