ESCO Air Conditioning Exam - Questions with 100% Correct Answers

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ESCO Air Conditioning Exam - Questions with 100% Correct Answers Heat which causes a change in temperature of a substance is called Sensible heat Heat added to a substance without a rise in temperat... ure Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called Superheat Scroll compressor move refrigerant by Involute Spirals The movement of heat by way of fluid is called Convection The movement of heat by direct contact is Conduction The standard unit for measuring the quantity of heat in a substance is BTUs Refrigerant gives up heat when It condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? Prevent liquid slugging of 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 Which of the following is not a thermodynamic property of refrigerants Flammability The sequential order of steps in the vapor compressions process are 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 201 psig Fan airflow pressures are usually measured in Inches of water column 0 pounds per square inch absolute is A pressure which cannot be further reduced 0 pounds per square inch gauge is 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 Mechanical shaft seal is necessary on a Open drive compressor Liquid slugging is Liquid refrigerant in the compressor clearance space The clearance space in reciprocating compressor Has an effect on compressor capacity Which of the following types of air conditioning compressor is most energy-efficient Scroll Which of the following represent the right order for the functions of a condenser De-superheat, 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 87 psig There are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled 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 100°F [Show More]

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