ESCO Light Commercial Refrigeration (Refrigeration Systems) Comprehensive Resource To Help You Ace Includes Frequently Tested Questions With ELABORATED 100% Correct COMPLETE SOLUTIONS Guaranteed Pass First Attempt!! Current Update!!

ESCO Light Commercial Refrigeration (Refrigeration Systems) Comprehensive Resource To Help You Ace Includes Frequently Tested Questions With ELABORATED 100% Correct COMPLETE SOLUTIONS Guaranteed Pass First Attempt!! Current Update!! 1. In a dry-type (direct expansion) evaporator, liquid refrigerant must boil away near the end of the coil to: A. Increase pressure B. Prevent liquid refrigerant from entering the compressor C. Reduce airflow D. Increase condenser temperature Answer: B. Prevent liquid refrigerant from entering the compressor 2. What is the term for the difference between the evaporator boiling temperature and the temperature at the evaporator outlet? A. Subcooling B. Compression ratio C. Superheat D. Saturation Answer: C. Superheat 3. An expansion device that is stuck open will most likely cause: A. High superheat B. Low refrigerant flow C. Flooding of the evaporator D. High head pressure Answer: C. Flooding of the evaporator 4. When measuring evaporator superheat on a system with a long suction line, pressure should be measured at the: A. Compressor discharge B. Condenser outlet C. Evaporator outlet D. Liquid line Answer: C. Evaporator outlet 5. Superheat measurements are best taken: A. At system startup B. At steady-state operation C. During shutdown D. During defrost Answer: B. At steady-state operation 6. Uneven superheat in a multi-circuit evaporator is most likely caused by: A. Equal refrigerant distribution B. Blocked or restricted circuit C. Low head pressure D. High airflow Answer: B. Blocked or restricted circuit 7. A thermostatic expansion valve (TEV) with an external equalizer is used when: A. Pressure drop across the evaporator is significant B. System pressure is low C. System is flooded D. Capillary tube is used Answer: A. Pressure drop across the evaporator is significant 8. Dry-type evaporators operate most efficiently with a superheat setting of approximately: A. 0°F B. 5–10°F C. 20°F D. 30°F Answer: B. 5–10°F 9. A liquid chiller evaporator has normal superheat but poor cooling. What is the most likely cause? A. Low airflow B. Low load or insufficient heat transfer C. High superheat D. Excess refrigerant Answer: B. Low load or insufficient heat transfer 10. What is the recommended time interval between superheat adjustments? A. 1 minute B. 5 minutes C. 10–15 minutes D. 1 hour Answer: C. 10–15 minutes 11. Low-temperature evaporators are primarily used for: A. Air conditioning B. Space heating C. Freezing or refrigeration of products D. Water heating Answer: C. Freezing or refrigeration of products 12. Flooded evaporators typically use which metering device? A. Capillary tube B. Float valve C. TEV D. Fixed orifice Answer: B. Float valve 13. A properly functioning condenser will first: A. Increase pressure B. Desuperheat the refrigerant vapor C. Freeze refrigerant D. Reduce airflow Answer: B. Desuperheat the refrigerant vapor 14. An inefficient water-cooled condenser will result in: A. Low head pressure B. High condensing temperature and pressure C. Low refrigerant flow D. Low superheat Answer: B. High condensing temperature and pressure 15. In a water-cooled condenser, refrigerant condenses at approximately how much higher than the leaving water temperature? A. 2–5°F B. 10–20°F C. 30–40°F D. 50°F Answer: B. 10–20°F