ESCO Air Conditioning Exam 2024/2025 Questions and Answers 100% Verified Heat which causes a change in temperature of a substance is called - Correct Answer Sensible heat Heat added to a substance without a rise in temperature - Correct Answer Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called - Correct Answer Superheat Scroll compressor move refrigerant by - Correct Answer Involute Spirals The movement of heat by way of fluid is called - Correct Answer Convection The movement of heat by direct contact is - Correct Answer Conduction The standard unit for measuring the quantity of heat in a substance is - Correct Answer BTUs Refrigerant gives up heat when - Correct Answer It condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - Correct Answer Prevent liquid slugging of the compressor The state of the refrigerant in the suction line should be - Correct Answer Low pressure / Low temperature vapor The state of the refrigerant entering the condenser is - Correct Answer High pressure / Highly superheated vapor The evaporator - Correct Answer Transfers heat from the refrigerated space to the refrigerant 1 / 2
Which of the following is not a thermodynamic property of refrigerants - Correct Answer Flammability The sequential order of steps in the vapor compressions process are - Correct 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 - Correct Answer 201 psig Fan airflow pressures are usually measured in - Correct Answer Inches of water column
- pounds per square inch absolute is - Correct Answer A pressure which cannot be further reduced
- pounds per square inch gauge is - Correct Answer The same as atmospheric pressure
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The temperature at which moisture will start to condense from the air is called - Correct Answer Dew point temperature A compound pressure gauge measures - Correct Answer Pressure and vacuum Mechanical shaft seal is necessary on a - Correct Answer Open drive compressor Liquid slugging is - Correct Answer Liquid refrigerant in the compressor clearance space The clearance space in reciprocating compressor - Correct Answer Has an effect on compressor capacity Which of the following types of air conditioning compressor is most energy-efficient - Correct Answer Scroll Which of the following represent the right order for the functions of a condenser - Correct Answer De- superheat, Condenses, Subcools