AC Review HVAC Exam Questions And Answers

Heat which causes a change in temperature of a substance is called; - ans-Sensible Heat. heat added to substance without a rise in temperature; (example: liquid refrigerant to gas) this process is called? - ans-Latent heat of vaporization. Heat added to the refrigerant in a vapor state after the evaporation process is called; - ans-Superheat. A scroll compressor move refrigerant by means of; - ans-Involute Spirals. The movement of heat by way of fluid (or air) is called; - ans-Convection. The movement of heat by direct contact is called; - ans-Conduction. The standard unit for measuring the quantity of heat in a substance is; - ans-The British Thermal Unit (Btu). A refrigerant gives up heat when; - ans-It condenses. Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - ans-Prevent liquid slugging of the compressor. The state of the refrigerant in the suction line should be; - ans-Low pressure/low temperature vapor.