A heat pump defrost control must do three things: Turn on auxiliary heat, turn off the condenser fan motor, and:

A) Turn off the indoor blower fan. B) Turn off the compressor.
C) Deactivate the thermostat. D) Shift the reversing valve from heat to cool.


D

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Explain what impact strength is and give at least one example of the impact strength of a common material.

What will be an ideal response?

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_____ corrosion occurs between two different types of metal that are placed together or within the same corrosive environment.? ?  

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

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____ grids, strong enough to support vehicle traffic, installed over a gravel sub base and filled with vegetation are another porous paving option.

A. Plastic-covered fiberglass B. Fiberglass-covered plastic C. Plastic D. Fiberglass

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The temperature of superheated refrigerant is

A. at its boiling point. B. above its boiling point. C. below its boiling point. D. none of the above.

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