The reversing valve reverses the direction of refrigerant flow
A) By reversing the airflow through the two heat exchange coils
B) By reversing the direction of the compressor motor
C) Reversing the polarity of the electric power supplying the system
D) And reverses the function of the two heat exchange coils
D
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Arching action occurs in a masonry wall with _______.
A) a stack-bond pattern. B) a running-bond pattern. C) both A and B. D) neither A nor B.
To increase furnace efficiency, the startup of the furnace blower is delayed using a _____.
a. thermocouple b. limit control c. time delay relay d. short-cycle time
When comparing two mutually exclusive alternatives by the ROR method, if the rate of return on the alternative with the higher first cost is less than that of the lower first-cost alternative: (choose one)
(a) The rate of return on the increment between the two is greater than the rate of return for the lower first-cost alternative (b) The rate of return on the increment is less than the rate of return for the lower first-cost alternative (c) The higher first-cost alternative may be the better of the two alternatives (d) The lower first-cost alternative should be selected
Mechanical draft towers are categorized as:
A) Packaged or split-system. B) Induced-draft or forced-draft. C) Upflow or downflow. D) Low-pressure or high-pressure.