Explanation: For successful operation, the rotational speed/frequency of the synchronous machine must synchronize with the frequency of the energy system, and this is the reason for calling it a synchronous machine. 7. In larger DC machines, the reason behind using fabricated steel instead of cast iron in the manufacture of yoke is ?
A. economical considerations
B. permeability considerations
C. mechanical considerations
D. insulation considerations
Answer:A
Explanation: For successful operation, the rotational speed/frequency of the synchronous machine must synchronize with the frequency of the energy system, and this is the reason for calling it a synchronous machine. 7. In larger DC machines, the reason behind using fabricated steel instead of cast iron in the manufacture of yoke is ?
A. economical considerations B. permeability considerations C. mechanical considerations D. insulation considerations
Explanation: Fabricated steel has higher permeability than cast iron.