What is the annual leak rate of a system that holds 100 lb of refrigerant and loses three lb of refrigerant in a month?
A) 36 percent
B) 3 percent
C) The annual leak rate can only be determined at the factory.
D) You must check for an entire year to calculate the annual leak rate.
[Ques. 2] Which of the following describes the consequence of noncondensable gases collecting in the condenser and the resulting increases in refrigerant temperature and pressure?
A) A reduction of system capacity and an increase in energy usage
B) A freeze-up at the expansion valve or metering device
C) The corrosion of metals throughout the system
D) An increase in the efficiency of the refrigeration system
[Ques. 3] The purpose of evacuating a refrigeration system is to:
A) Remove noncondensable gases. B) Remove noncondensable gases and moisture.
C) Remove moisture. D) Remove refrigerant oil.
[Ques. 4] Calculate the electric power for a 12-V DC circuit drawing 3 A?
A) 12 V + 3 A = 15 W B) 12 V/3 A = 4 W C) 3 A/12 V = 0.25 W D) 3 A 12 V = 36 W
[Ques. 5] Which of the following accurately describes the danger of air in the refrigeration system?
A) The presence of air makes it impossible to connect a vacuum pump, which is necessary to perform the evacuation procedure.
B) Too much air makes it impossible to properly calibrate an analog vacuum gauge within the refrigeration system.
C) Oxygen may violently react with hydrogen and potentially cause a fire within the refrigeration system.
D) Oxygen will chemically react with the refrigeration oil and deposits buildup in the discharge valve area, causing compressor motor burnouts.
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