Why did the development of 80 percent efficient furnaces using draft-inducer fans present a problem for venting tables?
A) The inducer fan cooled the air, and a smaller vent was required to prevent condensation.
B) The use of natural-draft and draft-induced furnaces had little impact on venting tables.
C) The draft-inducer fans required the use of a larger vent.
D) The fan heated the air too much for standard venting.
A
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The tendons used for prestressing a PT concrete slab-on-ground generally consist of
A) two-strand tendons, each strand made of seven wires. B) a single 1/2-in.-diameter, seven-wire strand. C) a single 1/2-in.-diameter, nine-wire strand. D) three -strand tendons, each strand made of seven wires. E) none of the above.
If drainage is a problem, the planting may be placed below soil level
Indicate whether the statement is true or false
What is the purpose of a chiller economizer?
A) To superheat the liquid refrigerant before it enters the chiller B) To subcool the liquid refrigerant before it enters the chiller C) To limit the compressor current draw D) To use outdoor air for cooling
The main divisions of the HVACR industry include:
A) Heating and cooling residential building structures. B) Cooling, heating, ventilating, or refrigerating specific spaces. C) Air conditioning, heating, or refrigerating industrial building structures. D) Ventilating and cooling commercial building structures.