Explain why increasing the line sizing affects water hammer.

What will be an ideal response?


A larger line size reduces the velocity and, therefore, reduces or eliminates water hammer.

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The pressure relief valve on a 134a A/C system will open at about ________ PSI.

A) 175 to 300 B) 400 C) 500 to 600 D) 300

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The chimney sections are slipped together and fastened with sheet metal screws, and then the chimney is framed with wood and covered with the specified siding and trim; this chimney enclosure is called ______.

A. chase B. flue C. damper D. smoke shelf

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List three reasons an arcing incident may occur._______________________________________________________________________________________________________________________________________________________________________________________________________________

What will be an ideal response?

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Which port is used as input in the 74LS244 circuit?

A) port 3 B) port 0 C) port 2 D) port 1

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