In addition to installation rules, the NEC® is concerned with the ____.
A. types of installation methods
B. electrical contractor licensing requirements
C. type and quality of electrical wiring system materials
D. supervising agency
Answer: C
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A steam trap is a self-actuating drain valve that _____.
a. increases steam pressure b. humidifies the steam c. closes before it passes live steam d. cools the steam
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Plants that reproduce asexually usually do not have _____
A) nodes B) buds C) leaves D) flowers
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An R-22 system operating with a liquid pressure of 226 psig (110° saturation temperature). The specified system subcooling is 5°F. The liquid line temperature should be:
A) 110°F. B) 115°F. C) 105°F. D) 100°F.
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The ozone depletion factor of R-12 is ____.
A. 0.8 B. 0.016 C. 0.05 D. 1.0
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