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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. | |
A. | 3 [Correct Answer] |
B. | 30 [Wrong Answer] |
C. | 70 [Wrong Answer] |
D. | 100 [Wrong Answer] |