Page 1 of 49
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.
1
, Page 2 of 49
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
2
, Page 3 of 49
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
3
, Page 4 of 49
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
4
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.
1
, Page 2 of 49
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
2
, Page 3 of 49
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
3
, Page 4 of 49
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
4
