In order to reduce the chances of indoor air contamination, __________appliances can be used, as they draw in outside air for combustion and exhaust the flue gasses directly back out.
What will be an ideal response?
sealed-combustion
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The abbreviation for each welding process ends with the letter ____________________.
Fill in the blank(s) with the appropriate word(s).
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In warm weather, concrete block should not be laid on the footing until _____ have/has passed.
A. two weeks B. one week C. 3 days D. 48 hours
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In a modern diesel engine, what percentage of total power is typically consumed in overcoming pumping and frictional losses?
A. 5% B. 10% C. 15% D. 20%
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In a variable frequency control, the ____ sets the ratio by which the voltage increases as frequency increases or decreases as frequency decreases.
a. volts per hertz b. maximum Hz c. current limit d. minimum Hz
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