In a DX system operating normally, the refrigerant leaving the evaporator should be _____.
a. all liquid
b. a liquid/vapor mixture
c. a superheated vapor
d. a subcooled liquid
c. a superheated vapor
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The standard shear resisting method used for walls is to apply structural sheathing such as ____________, nailed to the studs and plates in a prescribed manner.
A. Wood B. Plywood C. steel D. iron
The refrigerants that a particular recovery unit is designed for can be determined by:
A) Trying different refrigerants, measuring the unit amp draw, and comparing it against the nameplate. B) Recovery machines must work with all refrigerants to be EPA certified. C) Looking for the ARI/UL certification label. D) Measuring the pressure and temperature of the refrigerant in the recovery unit and comparing them to a saturated pressure-temperature chart.
Which of the following statements about zoned systems is correct?
A) One thermostat controls all the motorized valves in the system. B) Zoned systems are only used for commercial buildings. C) Water flow in zoned systems is controlled by a motorized valve. D) Individual zone temperature control is not available in zoned systems.
When there is an elbow in fiberglass duct, a hanger must be placed within _____
a. 12 inches of the elbow throat b. 12 inches of the connection to the straight duct c. 18 inches of the elbow throat d. 18 inches of the connection to the straight duct