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Question 1
A refrigeration system operating on a vapor compression cycle has an evaporator exit enthalpy (suction to compressor) of 1450 kJ/kg and a condenser inlet enthalpy (compressor discharge) of 1720 kJ/kg. If the liquid entering the expansion valve has an enthalpy of 350 kJ/kg, what is the Coefficient of Performance (COP) of the refrigeration cycle?
Correct Answer:
4.07
Question 2
An ammonia refrigeration system is required to provide a cooling capacity of 150 kW. The evaporator exit enthalpy is 1460 kJ/kg and the liquid entering the expansion valve has an enthalpy of 360 kJ/kg. What is the required mass flow rate of the refrigerant in kg/s?
Correct Answer:
0.136 kg/s
Question 3
A reciprocating compressor has a cylinder displacement of 0.085 m³/s. The mass flow rate of refrigerant is 0.136 kg/s and the specific volume of the vapor at the compressor inlet is 0.50 m³/kg. What is the volumetric efficiency of the compressor?
Correct Answer:
80%
Question 4
An ammonia compressor operates with a suction mass flow rate of 0.15 kg/s. The specific volume of ammonia vapor at suction conditions is 0.42 m³/kg. If the compressor has a volumetric efficiency of 75%, what is the required theoretical compressor displacement in m³/s?
Correct Answer:
0.084 m³/s
Question 5
In a vapor compression refrigeration cycle, the refrigerant mass flow rate is 0.12 kg/s. The compressor inlet enthalpy is 1450 kJ/kg, the compressor outlet enthalpy is 1750 kJ/kg, and the liquid enthalpy leaving the condenser is 380 kJ/kg. What is the total rate of heat rejected by the condenser in kW?
Correct Answer:
164.4 kW
Question 1
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About this Exam

Prepare with the SOPEEC Refrigeration Operator A Practice Questions - SOPEEC Refrigeration Operator Class A Exam practice quiz. This question bank includes 100 questions covering refrigeration, compressor, valve, ammonia, and pressure. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SOPEEC Refrigeration Operator A Practice Questions - SOPEEC Refrigeration Operator Class A Exam

This practice set contains 100 questions from the matching question bank and focuses on refrigeration, compressor, valve, ammonia, and pressure. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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