Which method enables ultraviolet (UV) lamps to be able to kill the maximum number of microbes in a duct system?
a. Install UV lamps in the airstream ahead of an EAC.
b. Constantly bathe the evaporator coil with UV light.
c. Cycle the UV lamps on and off with the furnace blower.
d. Install UV lamps in the return air duct airstream.
b. Constantly bathe the evaporator coil with UV light.
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The process of applying or spreading the mortar to a wall is also called _____ the mortar.
A. slinging B. stringing C. running D. snapping
A typical nitrogen cylinder is charged to a pressure of roughly _____.
a. 3,500 psig b. 2,000 psig c. 1,000 psig d. 250 psig
An oxygen sensor is being tested using a DSO (digital storage oscilloscope). A good oxygen sensor should display how many transitions (switches) per second?
A) 10-15 B) 1-5 C) 15-20 D) 5-10
Showing empathy with a customer means that you are _____
a. establishing good communication b. putting yourself in their shoes c. listening carefully to what they say d. getting them to approve of you