Explanation: Uniform current density J=(20∗3)/(Π/3)=180/Π. 12. A sinusoidal current sheet in a rotating electrical machine has peak value along q-axis. The peak value of sinusoidal MMF would be
A. in phase with current peak
B. 90° lagging the current peak
C. 90° leading the current peak
D. may lag or lead depending upon the type of machine
Answer:A
Explanation: Uniform current density J=(20∗3)/(Π/3)=180/Π. 12. A sinusoidal current sheet in a rotating electrical machine has peak value along q-axis. The peak value of sinusoidal MMF would be
A. in phase with current peak B. 90° lagging the current peak C. 90° leading the current peak D. may lag or lead depending upon the type of machine
Explanation: Sinusoidal current sheet produces sinusoidal MMF wave leading by 90°. 13. In a DC machine, z,p,Ia and a are respectively the number of conductors, number of poles, armature current and number of parallel paths. The peak value of fundamental component of armature MMF wave is ____________