?Technician A says a simple check valve is used to block a hydraulic passageway. Technician B says it normally stops fluid flow in both directions. Who is correct?

A. ?A only
B. ?B only
C. ?Both A and B
D. ?Neither A nor B


Answer: C

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Insulation fitted to pipe with a single miter cut are called _____.

a. stove-pipe miters b. small pipe miters c. heel-and-throat cuts d. insulation bevels

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Some water source heat pumps contain a separate coaxial coil for heating domestic hot water. The heat for the domestic hot water comes from

A) a submersion style electric heater B) subcooling the liquid leaving the condenser C) de-superheating the hot gas leaving the compressor D) using the water heating coil instead of the loop in cooling

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The natural environment is man-made

Indicate whether the statement is true or false

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If the voltage at the output lead of a three-wire sensor decreases when the sensor is activated, it is a __________ device.

A. sourcing B. sinking

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