How are heat pumps classified?
A) By their refrigerant type B) By their cooling source and cooling sink
C) By their air intake pump D) By their heat source and heat sink
D
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The organization(s) that test and list circuit breakers is/are _____.
a. IEEE b. OSHA and NEMA c. CSA and UL d. UL and NEMA
Most zone dampers in zoning systems _____
a. are powered open and spring-return closed b. are powered closed and spring-returned open c. have four distinct positions d. must serve more than one diffuser
_________ _______is a measure of the rate at which the viscosity of a lubricant will change as the temperature changes
Fill in the blank(s) with correct word
Three reference points for checking temperature measuring instruments are ____.
A. 0°F, 100°F, 110°F B. -460°F, 0°F, 32°F C. 32°F, 98.6°F, 212°F D. 32°F, 100°F, 250°F