The accompanying figure shows an assortment of mechanical symbols. What is the third symbol from the top?

A. Diaphragm valve
B. Angle globe valve
C. Ball valve
D. Butterfly valve


Answer: A

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In the heating mode, the reversing valve will normally be _____.

a. energized b. de-energized c. back-seated d. front-seated

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Four key elements of plant security are:

What will be an ideal response?

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A unit's communicating status can be determined by:

A) Checking the amp draw of the communicating bus. B) Checking the voltage on the communicating bus. C) Ohming the communication lines. D) Checking the communicating LED on the board.

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The conductor size, fuse or circuit breaker size, and overload size are generally determined using the ____.

A. NEMA Code letter B. National Electrical Code C. SF D. voltage

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