The technician should always use a __________ when adding refrigerant to, or removing refrigerant from a system, as proper record keeping regarding refrigerant quantities added to, removed from, or leaking from systems is vital.

What will be an ideal response?


charging scale

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Write the formula used to calculate the minimum distance between rows of PV modules.

What will be an ideal response?

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Battery vents are used in commercial buildings _____.

a. only for fixtures on the top floor b. to connect a series of fixtures c. where electric power might be lost d. with high-efficiency fixtures

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When a nine-lead delta connected motor is wired for high voltage, the phase coils are connected in ____.

a. conjunction b. pairs c. parallel d. series

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When unburned hydrocarbons are exposed to oxides of nitrogen and sunlight, what is produced?

A. particulate matter B. carbon monoxide C. both A and B D. photochemical smog

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