Refrigeration Exam 1 ALL 280 QUESTIONS AND CORRECT ANSWERS LATEST UPDATE THIS YEAR

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Refrigeration Exam 1 ALL 280 QUESTIONS AND
CORRECT ANSWERS LATEST UPDATE THIS
YEAR
QUESTION: In a system using a high side float, what would happen if the float sank? - ANSWER-

the evaporator would starve




QUESTION: What unit of measurement are thermostatic expansion valves rated in? - ANSWER-

tons of refrigeration




QUESTION: What is the maximum amount of refrigerant that can be stored in a 125 pound

cylinder? - ANSWER-100 Pounds




QUESTION: What law governs refrigerants and their use and storage? - ANSWER-Section 608 of

the Clean Air Act of 1990




QUESTION: What is refrigerant reclaiming? - ANSWER-All of the above.




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QUESTION: Which of the following is R-717? - ANSWER-Ammonia




QUESTION: What is the term for the heat that increases the temperature of a refrigerant? -

ANSWER-sensible heat




QUESTION: What would be a sign of over charging in a system with a high side float? -

ANSWER-frost on the suction line




QUESTION: A refrigeration unit with a capacity of 788,000 Btu/hr, produces how many tons of

refrigeration? - ANSWER-65 Tons




QUESTION: Ammonia compressor low-side compound gauges are usually calibrated to read

from: - ANSWER-30" vacuum to 300 psig




QUESTION: Calculate the compression ratio of a compressor operating with a suction pressure

of 30 psig and a discharge pressure of 125 psig. - ANSWER-3.13




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QUESTION: Calculate the total force exerted on a piston 5 inches in diameter, has a 12 inch

stroke, and the pressure on the cylinder is 125 psi. - ANSWER-2,453 pounds




QUESTION: Condenser cooling water with a pH of 10.0 would be considered: - ANSWER-Alkaline




QUESTION: Cooling tower water pH should be maintained at about: - ANSWER-8




QUESTION: In a refrigeration system, what function does the evaporator perform? - ANSWER-It

absorbs heat from the system




QUESTION: In a system using an automatic expansion valve, constant pressure would be

maintained at the: - ANSWER-Evaporator




QUESTION: In an absorption system, where does the refrigerant change from a vapor to a

liquid? - ANSWER-Rectifier




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QUESTION: In an absorption system, where does the refrigerant release its high pressure latent

heat of condensation? - ANSWER-the condenser




QUESTION: In an efficiently operating refrigeration system, where would flash gas most likely

form? - ANSWER-in the evaporator




QUESTION: In refrigeration practice, the term "refrigerant reclaiming" can best be described as:

- ANSWER-the reprocessing of a refrigerant into a new product


the selling of reprocessed refrigerant as a reclaimed refrigerant


the chemical analysis and distillation of a refrigerant


all of the answers




QUESTION: In refrigeration practice, what is the reason for sub-cooling the refrigerant? -

ANSWER-to increase the refrigeration effect




QUESTION: In what units of measurement are thermostatic expansion valves rated in? -

ANSWER-Tons of refrigeration




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