Which instrument measures the pressure of flue gases in the furnace?

A. draft gauge
B. smoke tester
C. carbon dioxide tester
D. stack thermometer


Answer: A

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2x(x + 1)(x - 1) = ____

A. 2x3 - 2x B. 2x2 + 1 C. 2x2 -2 x + 2 D. x3 - 2x + 1

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Determine the number of degrees through which the minute hand moves from 4:20 to 5:10.

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

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Change the following amount of time into its decimal equivalent of an hour. 15 minutes

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

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Analog electronic leak detectors should be checked by exposing them to:

A) Pure Nitrogen. B) Sample gasses of 0% and 100%. C) A small quantity of pure refrigerant. D) Pure Oxygen.

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