It is important to the HVACR technician to understand the changes of state of matter because:
A) Technicians are required to mix refrigerants to attain proper pressures and temperatures when charging refrigeration systems.
B) NATE certification exams require a good understanding of the periodic table of elements.
C) The refrigerant recovery process requires a technician to know which state the matter is in to ensure that only like refrigerants are put into a recovery container.
D) The cooling and heating process requires a change of state of matter in some form.
D
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Fill in the blank(s) with the appropriate word(s).
Technician A says the pressure differential valve is a hydraulically operated switch that controls the brake failure warning lamp on the instrument panel. Technician B says the pressure differential valve came into use after the advent of ABS braking. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
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