Refrigeration Excellence Questions and Answers Already Passed

Refrigeration Excellence Questions and Answers Already Passed 8. Dry type evaporators operate most efficiently with the superheat setting of approximately A. 8°F to 12°F B. 13°F to 19°F C. 20°F to 30°F D. 31°F to 40°F A. 8°F to 12°F 9. An evaporator used to chill liquids is operating within normal superheat setting. But the system is not cooling the product properly. Which of the following is most likely the cause? A. Overcharge of refrigerant B. Undercharge of refrigerant C. The circulator D. The TXV A. Overcharge of refrigerant 10. What time interval is required between each superheat adjustment? A. Not less than one hour B. About 10 to 15 minutes C. At least a half hour D. No time delay B. About 10 to 15 minutes 11. A low temperature evaporator used for cooling space or product refrigeration A. Is the same as one used for medium or high temperatures B. Must have fins space closer together C. Must be frosted periodically D. Must be defrosted periodically D. Must be defrosted periodically 12. Some special applications use a flooded evaporator (operated full of refrigerant) in order to maintain the proper level of liquid refrigerant, a ______ type devices used. A. High side float B. Capillary tube C. AEV D. Low side float D. Low side float 13. A properly functioning condenser will first A. Condense, then de-superheat B. Sub-cool, then de-superheat C. Sub-cool, then superheat D. De-superheat, then sub-cool D. De-superheat, then sub-cool 1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. Operate at high-efficiency B. Ensure that Frost is not accumulate C. Subcool the compressor D. Ensure proper oil return A. Operate at high-efficiency 2. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator outlet is known as A. Evaporator superheat B. Latent heat C. Evaporator sub-cooling D. Sublimation A. Evaporator superheat 3. An expansion device that is stuck open will cause A. Low suction pressure B. A starved evaporator C. Excessive superheat D. A flooded evaporator D. A flooded evaporator 4. When measuring evaporator superheat on a commercial system that has a long suction line, the pressure reading should be taken at the A. Compressor inlet B. Evaporator outlet C. Condenser outlet D. Receiver Inlet A. Compressor inlet 5. Superheat measurements are best taken