Regardless of the insulation value, ____ is the most critical element in overhead doors, and finding units with high performance of this element is a challenge.

A. air leakage
B. conduction
C. heat loss
D. lighting


Answer: A

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The recirculation door is an example of a ________ actuator

A) Variable-position B) Three-position C) Dual-position D) None of these

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During the process of a ground survey, the survey team records spot elevations at known points. These records are called ____.

A. survey points or field notes B. elevation points or field notes C. survey points or ground notes D. elevation points or ground notes

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A thermometer registered 85 degrees F, but the actual temperature was 90 degrees F. The percent error to the nearest tenth is ____________________%

Fill in the blank(s) with the appropriate word(s).

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____ is the elapsed time between the instant a deviation of the controlled variable occurs, and the corrective action begins.

A. Time lag B. Dynamic response C. Dead time D. Pure lag

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