Most preinsulated chilled water pipe systems consist of the pipe carrying the fluid, insulation, and an outer shell of ______.
a. mineral wool
b. PVC or fiberglass-reinforced plastic
c. cellulose
d. polyurethane foam
b. PVC or fiberglass-reinforced plastic
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?In all cases of injection molding, pelletized or granular materials must absorb enough heat to allow them to ____.
A. ?vaporize B. ?cure C. ?set D. ?flow
A(n) ____ weld is the most common out-of-position weld that a welder is required to perform.
A. overhead B. trailing C. horizontal D. vertical
Which organization developed guidelines for OBD II?
A) CARB B) EPA and CARB C) DOT and EPA D) EPA
Semi-hermetic compressors on large commercial AC units use ________ to stage the compressor by cutting out individual cylinders in response to load changes
A) Unloaders B) King valves C) Automatic expansion valves D) TXV valves