HVAC Air Condition Esco 2024 Questions And Answers | 100% Correct Answers |Updated Quiz

Heat which causes a change in temperature of a substance is called - Answer-Sensible Heat Heat added to a substance without a rise in temperature is called - Answer-Latent Heat Heat added to refrigerant in a vapor state after the evaporation process is called - Answer-Superheat A scroll compressor moved refrigerant by means of - Answer-Involute spirals The movement of heat by way of fluid is called - Answer-Convection The movement of heat through a solid object is called - Answer-Conduction The standard unit for measuring the quantity of heat in a substance - Answer-British Thermal Unit A refrigerant gives up heat when it - Answer-Condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - AnswerPrevent liquid slugging of compressor It is desirable for refrigerant in the suction line to be slightly superheated in order to - Answer-Insure liquid refrigerant does not enter the compressor A mechanical shaft seal is necessary on - Answer-Semi-hermetic compressor Liquid slugging is - Answer-Liquid refrigerant in the compressor clearance space The clearance space in a reciprocating compressor - Answer-Varies depending on compressor speedWhich of the following types of air conditioning compressors is most energy efficient - AnswerCentrifugal Which of the following represent the right order for the functions of a condenser? - Answer-Desuperheat, condenses, sub-cools Refrigerant R-134a vapor enters the compressor at 124 psig, 100°f. It leaves as a liquid from the condenser sub-cooled 20°f, and the pressure will approximately - Answer-18.4 psig There are 3 basic types of condensers, the air cooled, the water cooled, and the _______ cooled - Answer-Evaporative 10 lbs. of refrigerant passing through a water cooled condenser will lose 20 BTU's of heat per lb. If 10 lbs. of water passes through the condenser with an entering temperature of 80°f. The temperature of the water leaving the condenser is - Answer-100°f The heat removed from the refrigerant by the condenser is - Answer-Both sensible and latent heat An energy recovery ventilator is - Answer-An air to air heat exchanger to recover heat Which of the following can NOT be used as a low ambient temperature control? - Answer-Crankcase regulating valves The state of refrigeration in the suction line should be - Answer-Low pressure/ low temperature vapor The state of refrigerant entering the condenser is - Answer-High pressure/ highly superheated vapor The evaporator - Answer-Transfers heat from the refrigerated space to the refrigerant Which of the following is not a thermodynamic property of refrigerant - Answer-FlammabilityThe sequential order of steps in the vapor-compression process are - Answer-Compression, condensation, expansion, vaporization If a 30 pound container of R-410A refrigerant has been stored over night at 70°F, the pressure in the cylinder should be approximately - Answer-201 psig