Why are open-drive compressors often started up for a short time in the off season?

What will be an ideal response?


The shaft seal on the compressor is kept "wet" by the circulation of refrigeration oil over it. If the compressor is off for a long period of time, the shaft seal can dry up and eventually leak. Periodic running of the compressor helps keep the shaft seal in good shape.

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As concrete hardens, the heat of hydration continues, decreasing over a period of up to _____.

a. 18 hours b. 36 hours c. several days d. two weeks

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Rubber-tipped _____ work at full shop air pressure.

What will be an ideal response?

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The different colors used for the color bands on resistors represent:

A) Numbers. B) Letters. C) Letters and numbers. D) Frequencies.

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Why is it recommended that a person alternate wearing two different pairs of boots every other day?_______________________________________________________________________________________________________________________________________________________________________________________________________________

What will be an ideal response?

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