HVAC EXCELLENCE QUESTIONS AND ANSWERS ALREADY GRADED A

HVAC EXCELLENCE QUESTIONS AND ANSWERS ALREADY GRADED A Heat which causes a change in temperature of a substance is called sensible heat, Heat added to a substance without a rise in temperature; (example: liquid refrigerant to gas) this process la called? latent heat Heat added to the refrigerant in vapor state after the evaporation process is called, superheat A scroll compressor moves refrigerant by means of; involute spirals The movement of heat by way of fluid or is called; air convection The movement of heat through a solid object is called; radiation The standard unit for measuring the quantity of heat in a substance is British Thermal Unit A refrigerant gives up heat when it; it condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? prevent liquid slugging of the compressor. It is desirable for refrigerant in the suction line to be slightly superheated in order to; insure liquid refrigerant does not enter the compressor., The state of the refrigerant in the suction line should be low pressure/ low temperature vapor The state of the refrigerant entering the condenser is High Pressure/ Highly Superheated Vapor The Evaporator Transfers heat from the refrigerated space to the refrigerant The Evaporator Transfers heat from the refrigerated space to the refrigerant Which of the following is not a Thermodynamic Property of refrigerant Flammability The sequential order of steps in the vapor-compression process are: Compression, Condensation, Expansion, Vaporization If a 30 lb container of $-410A refrigerant has been stored over night at 70 degrees F, the pressure in the cylinder should be approximately 201 Degrees Faranheit Fan Airflow pressures are usually measured in Inches of water column Zero Psia (pounds per square inch absolute) is a pressure which cannot be further reduced Zero Psig (pounds per square inch gauge) The same as atmospheric pressure The Temperature at which moisture will start to condense from the air is called Dew Point Temperature A Compound pressure gauge measures Pressure and Vacuum A Mechanical shaft seal is necesssary on a Open