Why are explosion-proof motors not normally used on standard equipment?

A. They are too large.
B. They are too noisy.
C. They are too expensive.
D. They cannot be replaced.


Answer: C

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Helical springs are made in coils. Define active coils.

What will be an ideal response?

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Karnaugh mapping is the preferred method to design logic circuits from an excitation diagram. Sum of product expressions can be formed directly from excitation tables. For J = X; K = X conditions:

A) do not form SOP expressions for X inputs. B) X must be treated as a 0. C) X must be treated as a 1. D) any of the above

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Which of these heating methods is most commonly used as a heat source in cold climates?

a. Kerosene heaters b. Coal furnaces c. Natural gas furnaces d. Electric heaters

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________________ testing determines whether the pump is producing its specified output.

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

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