In a basic air-conditioning circuit there are two ____ switches in order to protect the compressor from extremes.
A. pressure
B. temperature
C. flow
D. float
Answer: A
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Which of these plants was domesticated in Neolithic times in the Andes in South America?
a. wild rice c. barley b. wheat d. potato
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Argon and helium are _________________________ gases, which means they will not combine chemically with any other material, and will not affect the molten weld pool in any way.
Fill in the blank(s) with the appropriate word(s).
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Hydraulic fluid in a working system has _____ energy
a. kinetic, potential, and heat b. potential and turbulent c. turbulent and kinetic d. velocity and flow
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In most cases, the refrigerant leaving the evaporator must be ____________________ percent vapor.
Fill in the blank(s) with the appropriate word(s).
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