Explanation: Space harmonics of the order 3,9,15,… i.e, triplen harmonics are absent. 3. When a single-phase winding is excited by an alternating current, then which of the following statements are correct?
A. It produces one stationary MMF wave
B. Produced MMF wave pulsates along its magnetic axis
C. It doesn’t produce two counter rotating MMF wave
D. All of the mentioned
Answer:A
Explanation: Space harmonics of the order 3,9,15,… i.e, triplen harmonics are absent. 3. When a single-phase winding is excited by an alternating current, then which of the following statements are correct?
A. It produces one stationary MMF wave B. Produced MMF wave pulsates along its magnetic axis C. It doesn’t produce two counter rotating MMF wave D. All of the mentioned
Explanation: It is the decomposition of the MMF of a single phase winding into two counter rotating MMF waves, but are not actually produced and only one stationary MMF wave pulsating along its magnetic axis is produced. 4. What does the space angle α in the equation Fr(α,t)=3/2Fmcos(α-ωt) for MMF produced when 3-phase balanced windings excited by three phase balanced currents represent?