Commercial Refrigeration Certification Exam with Questions and Answers

Commercial Refrigeration Certification Exam with Questions and Answers Which international agreement is primarily responsible for phasing out ozone-depleting substances such as CFCs used in commercial refrigeration systems? a. Kyoto Protocol b. Montreal Protocol c. Paris Agreement d. Basel Convention Correct Answer b. Montreal Protocol Rationale The Montreal Protocol (1987) is the key global treaty that regulates and phases out ozone-depleting substances like CFCs, halons, and HCFCs, which were widely used in refrigeration and air conditioning. In commercial refrigeration systems, a technician notices that a medium-temperature walk-in cooler is struggling to maintain setpoint despite the compressor running continuously. Which is the most likely initial diagnostic focus? a. Check for incorrect evaporator fan direction b. Inspect condenser coil cleanliness and airflow restriction c. Replace the thermostatic expansion valve immediately d. Increase refrigerant charge without testing Correct Answer: b Rationale: A dirty or restricted condenser coil is a common cause of reduced cooling efficiency and continuous compressor operation. Heat rejection failure increases head pressure and reduces system capacity, making it the most logical first check before altering refrigerant charge or replacing components.