Discussion
Consider the following statements about boiler efficiency.
1. The direct method needs the steam and fuel quantities 2. The indirect method identifies the individual losses 3. The two methods must give identical answers
Answer: A
The first two are correct and describe why both methods are used. In practice they differ by a point or two because of measurement error in the steam flow and estimation in the smaller loss heads, and a large discrepancy is itself informative.
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