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

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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

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Which organization developed guidelines for OBD II?

A) CARB B) EPA and CARB C) DOT and EPA D) EPA

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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

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