If an air-cooled refrigeration or air-conditioning system must operate at low outdoor temperatures, a low ambient control is used to ________________________________________.
Fill in the blank(s) with the appropriate word(s).
maintain acceptable head pressure
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When converting the number 0.00020543 to scientific notation, it is important to recognize that the numeral ____ is the first significant digit to be retained.
a. 0 b. 2 c. 4 d. 5
What are two differences between R404A and R477 (CO2) piping for the same evaporator temperature and system Btuh capacity?
a. R404A piping must withstand lower pressure and is a smaller diameter than R477 b. R477 piping must withstand higher pressure, but has smaller diameter than R404A
Technician A says that it is unlawful to disconnect the air conditioning hoses and allow the refrigerant to vent out. Technician B says that the power steering pump can be tied off to the side without disconnecting on some cars. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
Match the correct definition with the term.
A. Group of animals with many common traits that produce fertile offspring. B. East Indian pig. C. European wild boar. D. Bringing animals under the control of humans. E. Closely related groups of animals that share similar characteristics. F. Animal used for pulling loads.