Hvac Employment readiness Exam Questions And Answers Rated 100% Correct!!

Sensible Heat - Answer-Causes a change of temperature in a substance. Latent heat - Answer-Heat added to a substance without a rise in temperature. Superheat - Answer-Heat added to the refrigerant in the vapor state after the evaporator process. How does a scroll compressor work? - Answer-By means of Involute spirals Convection - Answer-The movement of heat by fluid or air Conduction - Answer-Movement of heat by direct contact BTU Definition - Answer-Standard unit for measuring heat in a substance. British thermal unit. Amount of heat required to raise 1lb of water 1° When does refrigerant give up heat? - Answer-When it condenses Refrigerant in the suction line may be what? - Answer-Slightly warmer than the saturation temperature to prevent liquid slugging of the compressor. The state of refrigerant in the suction line? - Answer-Low pressure, low temperature vapor. The state of the refrigerant entering the condenser? - Answer-High pressure, high superheated vapor. What does the evaporator do? - Answer-Transfers heat from the refrigerated space into the refrigerant. The Thermodynamic property's of refrigerant are? - Answer-Critical point, saturation point and enthalpy.Steps of vapor compression process - Answer-Compression, Condensation, expansion and vaporization. What are Fan airflow pressures measured in? - Answer-Inches of water column. WC Zero P S I A - Answer-Pounds per square inch absolute. Zero P S I G - Answer-Pounds per square inch Gaug