It is important to the HVACR technician to understand the changes of state of matter because:
A) 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.
B) Technicians are required to mix refrigerants to attain proper pressures and temperatures when charging refrigeration systems.
C) NATE certification exams require a good understanding of the periodic table of elements.
D) The cooling and heating process requires a change of state of matter in some form.
D
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____ indicates a filler metal that is used as a current carrying electrode, as a rod, or both.
A. R B. B C. RB D. IN
Light duration deals with the amount of time plants are exposed to light; scientists refer to this as ____
a. phototropism c. photosynthesis b. photoperiod d. photoproduction
There are two areas in which the properties of matter can be divided:
A) Physical and chemical. B) Specific gravity and Specific volume. C) Pressures above and below atmospheric pressure. D) Temperatures above and below 70°F.
This transistor model represents the __________
A) Silicon bilateral switch B) Gate controlled switch C) Bidirectional triode thyristor D) Silicon controlled switch E) None of the above