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
Approximately _______ of the time a confined space has an oxygen deficiency.
Fill in the blank(s) with the appropriate word(s).
What are the safety release devices on a regulator, and how do they work?
What will be an ideal response?
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