Which of the following valve types is NOT approved for use in a gas system?

a. ball
b. gate
c. butterfly
d. plug


ANSWER: c

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Metal heat-circulating fireplaces have been in use for _____ .

A. over a century B. more than 50 years C. about 40 years D. less than 25 years

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When the hydrogen required by a fuel cell is ‘reformed' from a gasoline source, what is the undesirable byproduct?

A. carbon B. static electricity C. depleted gasoline D. propane

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Both linear programming and breakeven analysis require the use of computers

Indicate whether the statement is true or false.

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What can cause odors or slime build-up in an ice machine?

A) Too many minerals in the water cause odor and slime build-up in an ice machine. B) Odor and slime build-up are caused by bacteria and fungi growth. C) Odor and slime build-up are caused by poor-quality water coming into the system. D) Cleaning the ice machine too often can cause odor and slime build-up.

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