What fan performance characteristics are shown on a typical fan curve?

A) pressure drop, efficiency, and horsepower
B) RPM, tip speed, and horsepower
C) sound levels, bearing temperatures, and reluctance
D) horsepower, RPM, and reluctance


A

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If a varnish-like substance has formed on an oil burner nozzle, it indicates that the _____.

a. nozzle is bent or warped b. nozzle is clogged c. furnace is overheating d. nozzle is rusty

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Approximately _______ of the time a confined space has an oxygen deficiency.

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

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What are the safety release devices on a regulator, and how do they work?

What will be an ideal response?

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For the current (I) and magnetic field (B) directions shown in the figure below, the resulting force on the current-carrying conductor would be in which direction?

A. down B. right C. left D. up

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