When two or more substances are mixed, the resulting chemical reaction always gives off heat
Indicate whether the statement is true or false.
F
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Poor ventilation may exist in a building when the concentration of carbon dioxide in the building exceeds _____.
a. 100 ppm b. 500 ppm c. 1,000 ppm d. 1,300 ppm
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Which of these may be used to restore damaged threads on a bolt?
A) Tap B) Die C) Both A and B D) Neither A nor B
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Reduces flash gas in the liquid line D) oil separator
What will be an ideal response?
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What would happen if the fan on an electric unit heater burned out?
A. The heater would remain energized until the fusible link melts. B. The interlock switch would de-energize the electric heater. C. The unit will still heat the area, but it would take longer to do so. D. Both a or b are possible.
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