A thermostat can fail in which way?
A) Stuck closed B) Stuck partially open
C) Stuck open D) Any of the above
D
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As far as buildings are concerned, what is the Underwriters Laboratories (UL) primarily recognized for?
Use the figure below to answer the following questions.
Controlling algae or slime in open recirculating systems involves using chemical treatments and _____.
a. cleaning the equipment thoroughly at regular intervals b. injecting scavenger microorganisms into the makeup water c. keeping the temperature of the water in the sump below 60°F d. restricting the air current path to the cooling tower periodically
Which of the following is used to measure the backlash of two gears in mesh?
A. Dial indicator B. Micrometer C. Feeler gauge D. None of the above
Copper granules are bonded to the surface of some architectural shingles to provide _____
a. ultraviolet protection b. corrosion resistance c. an attractive color d. fungus and algae resistance