Discussion
The efficiency of a large dc generator at rated load is typically about
Answer: B
Correct answer: 90 to 94 per cent
A large dc machine converts most of what it receives, the losses being a few per cent of rating: iron loss, friction and windage, the armature and field copper losses and the brush drop. Small machines do worse, since the constant losses are a larger fraction of a small output. No machine reaches 100 per cent, since the losses cannot be eliminated, and the maximum occurs where the variable loss has grown to equal the constant loss.
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