NATE Industry Competency Exam: Commercial Refrigeration Already Passed with 100%

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NATE Industry Competency Exam: Commercial Refrigeration Already Passed with 100% With the condensing pressure and compressor speed remaining constant, a decrease in suction pressure will cause a(n... ): a. Decrease in compressor capacity and decrease in current. b. Increase in compressor capacity and decrease in current. c. Increase in compressor capacity and increase in current. d. Decrease in compressor capacity and increase in current. ✔✔D An indication of non-condensable gas in a refrigeration system is significantly: a. Lower-than-normal suction pressures. b. higher-than-normal suction pressures. c. Lower-than-normal head pressures. d. higher-than-normal head pressures. ✔✔D An automatic expansion valve controls refrigerant flow to an evaporator by maintaining a constant: a. Suction pressure. b. Pressure differential across the valve port. c. Liquid line pressure. d. Superheat. ✔✔A What is the approximate compression ratio of a compressor operating at 35 psig suction pressure and 135 psig discharge pressure? a. 1:03. b. 3:01. c. 1:04. d. 4:01. ✔✔B The BTUs rejected at the condenser are always greater than the heat absorbed in the evaporator because: a. The condenser is mounted outside with restricted airflow. b. Of the high temperature of the discharge vapor and length of the discharge line. c. Of the inefficiency of the condenser and pressure drop in the discharge line. d. Of the heat of compression in the compressor. ✔✔D [Show More]

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