Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?
Correct answer: A. 3
- A. 3
- B. 30
- C. 7
- D. 70
Explanation
Furnace noise rises when the fuel firing rate and combustion turbulence increase; a 50% increase is commonly taken as producing roughly a 3 dB rise in this practical estimate. The alternatives of 30 or 70 dB are far too large for such a change.
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