What refrigerant is currently being used in refrigeration equipment?
A. R-12 and R-404a
B. R-22 and R-502
C. R-134a and R-12
D. R-134a and R-404a
Answer: D
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In addition to the MCC bucket and the combination types, motor starters can be found as _______________ components.
Fill in the blank(s) with the appropriate word(s).
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Vermiculite is a human?made element
Indicate whether the statement is true or false.
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"ECN" is an acronym for ____.
A. expanded columns and notes B. existing CADD information C. erection change notice D. engineering and CADD notification E. none of the above
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What is the most likely cause of flames that are lifting off the burner?
A) Excessive combustion chamber draft B) Too much primary air C) Misaligned burner D) Too little primary air
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