Liquid lines need to be insulated:
A) If they travel through an unusually hot space.
B) For systems using HFC refrigerants.
C) If they are run close enough to the hot suction line to pick up heat from it.
D) Always.
A
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What is the current flow in a purely resistive AC circuit if the resistance is 15 ohms and the voltage is 150V?
a. 10A b. 14A c. 18A d. 22A
Moisture in a liquid state must be ____ before it can be removed with a vacuum pump.
A. vaporized B. condensed C. cooled D. solidified
When replacing fuses be sure to match which of these ratings?
A) Voltage B) Class C) Amperage D) Instantaneous current E) All of these should be matched.
Why is a large refrigerant leak potentially dangerous?
A) Most common refrigerants used in residential systems are highly toxic. B) Most common refrigerants used in residential systems are highly corrosive. C) Most common refrigerants used in residential systems are highly flammable. D) They can replace all of the oxygen, leading to asphyxiation.