If a D.C. generator fails to build up the probable cause could not be_____________?
Correct answer: B. field resistance less than the critical resistance
- A. imperfect brush contact
- B. field resistance less than the critical resistance
- C. no residual magnetism in the generator
- D. faulty shunt connections tending to reduce the residual magnetism
Explanation
A shunt generator builds up when its field resistance is below the critical resistance, so that option supports voltage build-up rather than preventing it. Loss of residual magnetism, wrong shunt connections, or poor brush contact can stop the process.
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