Radiant floor heating systems typically operate at temperatures of:
A) 280°F to 300°F. B) 200°F to 250°F. C) 85°F to 140°F. D) 180°F to 200°F.
C
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Pneumatic control systems:
A) Use air pressure to modulate control valves. B) Are the most recent type of commercial control. C) Have no moving parts. D) Use electric motors to modulate control valves.
Mixed liquor is a term used to describe the
a. contents of a sludge digestion tank b. contents of a activated sludge aeration tank c. film of microorganisms growing on a trickling filter d. drink a treatment plant operator has with his or her lunch e. contents of a sludge thickening tank
The lower transistor of a totem-pole output is saturated when the gate output is
A) malfunctioning. B) HIGH. C) LOW. D) over driven.
Vented ____ provide airspace between the exterior finish and the sheathing.
A. flashing B. rainscreens C. housewraps D. windscreens