ESCO Air Conditioning Exam Questions With 100% Correct Answers!!

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 - Answer-Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called - Answer-Superheat Scroll compressor move refrigerant by - Answer-Involute Spirals The movement of heat by way of fluid is called - Answer-Convection The movement of heat by direct contact is - Answer-Conduction The standard unit for measuring the quantity of heat in a substance is - Answer-BTUs Refrigerant gives up heat when - Answer-It condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - AnswerPrevent liquid slugging of the compressor The state of the refrigerant in the suction line should be - Answer-Low pressure / Low temperature vapor The state of the 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 refrigerants - Answer-FlammabilityThe sequential order of steps in the vapor compressions process are - Answer-Compression, Condensation, Expansion, Vaporization If a 30 pound cylinder of reclaimed R 410 a refrigerant has been stored overnight at 70° the pressure in the cylinder should be approximately - Answer-201 psig Fan airflow pressures are usually measured in - Answer-Inches of water column 0 pounds per square inch absolute is - Answer-A pressure which cannot be further reduced 0 pounds per square inch gauge is - Answer-The same as atmospheric pressure The temperature at which moisture will start to condense from the air is called - Answer-Dew point temperature A compound pressure gauge measures - Answer-Pressure and vacuum Mechanical shaft seal is necessary on a - Answer-Open drive compressor Liquid slugging is - Answer-Liquid refrigerant in the compressor clearance space The clearance space in reciprocating compressor - Answer-Has an effect on compressor capacity Which of the following types of air conditioning compressor is most energy-efficient - Answer-Scroll Which of the following represent the right order for the functions of a condenser - Answer-Desuperheat, Condenses, Subcools Refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as a liquid from the condenser subcooled 20°F and the pressure will be approximately - Answer-87 psigThere are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled - Answer-Evaporative 10 pounds of refrigerant passing through a water cooled condenser will lose 20 BTUs of heat per pound. If 10 pounds 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