A mercury U-tube manometer is used to ____.
A. determine the level of vacuum while evacuating a refrigeration system
B. determine natural gas and liquified petroleum gas pressures
C. measure the operating pressure in the low side of a refrigeration system
D. analyze air flow problems in air duct distribution systems
Answer: A
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What is an advantage of extrusion coating? ?
A. ?labor costs are low B. ?no solvents are needed C. ?equipment is not costly D. ?the process is simple
Some common tying materials for budding and grafting include: ________, ________, ________, and ________.
Fill in the blank(s) with the appropriate word(s).
Joint geometry has two elements to it - shape and _____.?
A. dimensions? B. groove? C. angle? D. face?
What size should the combustion air openings be for a room with an 80,000 BTU/hr input furnace and a 35,000 BTU/hr water heater if the openings are opening directly into a ventilated attic and a ventilated crawlspace?
A) The size is irrelevant so long as there are combustion air vents. B) 115,000/1,000 = 115 sq in free area each C) 115,000/2,000 = 57.5 sq in free area each D) 115,000/4,000 = 28.75 sq in free area each