PVC drain lines on rooftop units should be insulated:

A) To improve system efficiency.
B) To prevent deterioration of the PVC from exposure to UV.
C) To avoid heating the condensate water.
D) To reduce the sound created by the high velocity through the drain.


B

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A backflow preventer (BFP) is required for which of the following? Select all that apply.

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An NPN transistor will short from emitter to collector when

A) the base is more positive than the emitter. B) the collector is more positive than the emitter. C) the emitter is more positive than the collector. D) the base is more negative than the emitter.

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The AISC ____, a valuable reference source in preparing sectional drawings, is helpful in clarifying any ambiguities relative to proper callouts and dimensions.

A. Structural Steel Detailing B. Guide to Steel Construction C. Manual of Steel Construction D. The Steel Construction Reference

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When you are installing interior wood doors, it is important to remember that four hinges must be used when

the door height is greater than _____. a. 6-1/2 feet b. 7 feet c. 8 feet d. 9 feet

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