A shunt generator can self-excite:_________________?
Correct answer: A. only if the resistance of the field circuit is less than critical value
- A. only if the resistance of the field circuit is less than critical value
- B. only if the resistance of the field circuit is greater than critical value
- C. irrespective of the value of the resistance in the field circuit
- D. none
Explanation
Self-excitation requires the shunt-field resistance to be below the critical resistance at the operating speed, allowing residual magnetism to build the voltage. If the resistance is above this limit, the voltage build-up stops.
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