In order to thread steel pipe, ____________________ must be used to make sure that friction and heat do not damage the pipe and/or cutting dies.

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


cutting oil

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Briefly explain the requirements for connections used to secure a panel to a structural frame.

What will be an ideal response?

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What are the two general categories of humidifiers?

A) Atomizing and evaporative B) Packaged and split system C) Condensing and non-condensing D) Wet and dry

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Polarity of the output of an RL differentiator is determined by:

A) the polarity of the incoming pulse. B) an external clipping circuit. C) the time constant of the RL circuit. D) the placement of the inductor.

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Fan coil units used in medium temperature cases are usually defrosted using ____.

A. electric heat B. hot gas heat C. hand scraped D. unit off cycle time

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