How does the presence of 7 to 9 percent CO2 in flue gas reflect heating unit performance?
A) It indicates a possible gas leak. B) It indicates a lack of efficiency.
C) It indicates that the unit is running efficiently. D) It indicates the level of CO2 is neutral.
C
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Head markings include the star, strip or stripe, snip, blaze, and ____________________ face.
Fill in the blank(s) with the appropriate word(s).
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If the purge unit on a chiller is operating very frequently, the system may have a leak.
Answer the following statement true (T) or false (F)
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The presence of iron and/or manganese in water causes
a. "blue babies", or methemoglobinemia b. scale deposits in plumbing c. tooth decay d. depletion of dissolved oxygen e. none of the above
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The natural environment is man-made.