AZ ROC C-49 Industrial Refrigeration Practice Questions - Arizona ROC C-49 Industrial Refrigeration (Commercial) Examination Exam

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What is the approximate critical temperature and critical pressure above which carbon dioxide (R-744) operates in a transcritical cycle?

87.8°F (31.1°C) and 1,055 psig (7.38 MPa) 120.4°F (49.1°C) and 650 psig (4.48 MPa) 45.2°F (7.3°C) and 1,450 psig (10.0 MPa) 104.0°F (40.0°C) and 850 psig (5.86 MPa)

Correct Answer:

87.8°F (31.1°C) and 1,055 psig (7.38 MPa)

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