What is a common use for self-starting sheet metal screws?

What will be an ideal response?


Self-starting sheet metal screws are commonly used for on-site sheet metal duct fabrication and installation.

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Because soldering and brazing are similar processes, both are classified by the American Welding Society (AWS) as ____________________.

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

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Commercial refrigeration systems normally have:

A) Most commercial refrigeration systems do not have refrigeration service valves. B) A suction service valve and a discharge service valve. C) A suction service valve, a discharge service valve, and a king valve. D) A liquid line valve and a suction service valve.

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Oxides of nitrogen results from a combination of nitrogen and ________

A) Oxygen B) Carbon C) Hydrogen D) Nitrogen

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Sealed combustion oil furnaces use:

A) A separate bottled oxygen supply for cleaner combustion. B) Special sealed airtight barometric draft regulators. C) High static oil burners. D) No vent because the combustion chamber is sealed.

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