Discussion
Which of the following is INCORRECT with reference to the parallel operation of alternators as compared to a single large unit?
Answer: D
Running alternators in parallel instead of one large unit gives reduced operating cost, because units can be switched on and off to follow the load, better reliability, because the loss of one unit does not stop the supply, and easier maintenance, because one machine can be taken out for service while the others carry the load. A set of machines can also be run near full load, where each is most efficient.
So poor efficiency is not an effect of parallel operation, and it is the incorrect statement. The answer is option D.
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