Refrigerant charging of VRF systems is always best done by _____
a. the superheat method
b. the subcooling method
c. the temperature drop method
d. weight
d
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A term used to describe flow in a heat exchanger where shell-side flow vertically crosses the horizontal tube flow.
a. cross flow b. horizontal flow c. parallel flow d. counter flow
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The insulator with the lowest breakdown voltage is
A) paper B) glass C) mica D) air
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The material used to make circular impellers is ____________________.
Fill in the blank(s) with the appropriate word(s).
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Which of the following overload devices is not affected by ambient temperature?
A. solder pot B. magnetic C. bimetal D. time-delay fuse
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