In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
Correct answer: A. increase
- A. increase
- B. decrease
- C. either of the above
- D. none of the above
Explanation
Increasing field mmf requires larger field coils and more magnetic material to produce the required flux, which increases the machine's size and cost. A reduced field mmf would have the opposite tendency, subject to flux requirements.
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