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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The Tariff of 1816 was the first in American history
A. that essentially foreclosed all the manufacturing imports from specific industrial sectors in America such as textiles. B. intended to raise revenue. C. that aimed to protect American industry. D. to impose taxes on American goods. E. designed to protect Southern agriculture.
What are the functions of a roof cover board? Explain.
What will be an ideal response?
____________________ direct vortex flow to provide smooth turbulence-free fluid flow.
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