Which of the following is unlikely to directly affect the ability of a heating system to vent combustion
products?
a. The diameter of the vent and vent connector
b. The combined length of the vent and vent connector
c. The number of elbows in the vent system
d. The type of ignition system used
d
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The most desirable method of exiting cable from a cable tray is _____.
a. between rungs or from the end of the tray using a dropout plate b. over the side c. from the end of the tray without a dropout plate d. between rungs without a dropout plate
The difference between system overshoot and system lag is called ____.
A. room temperature B. temperature rise C. temperature swing D. room swing
Which of the following is not recommended to attach rigid polymeric foam insulation to pipe?
a. Wire b. Bands c. Tape d. Self-seal jacket
?One of the first synthetic plastics was discovered by Dr. Leo H. Baekeland as a result of the chemical reaction of phenol and ____.
A. ?formaldehyde B. ?sulfur C. ?manganese D. ?selenium