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ESCO A/C EXAM QUESTIONS WITH 100% CORRECT ANSWERS 2024
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ESCO A/C EXAM QUESTIONS WITH 100% CORRECT ANSWERS 2024
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ESCO A/C EXAM QUESTIONS WITH 100% CORRECT ANSWERS 2024heat 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 of
vaporization
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-
btu
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 vaoor
the evaporator - Correct Answer-Transfers heat from the refrigerated space to the refrigerant
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
0 pounds per square inch absolute is - Correct Answer-A pressure which cannot be further reduced
0 pounds per square inch gauge is - Correct Answer-The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - Correct Answer-Dewpoint temperature
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 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, sub cools
refrigerant R 134a vapor enters the condenser at 124 psi G, 100°F. it leaves as liquid liquid from the condenser subcooled 20°F and the pressure will be approximately - Correct Answer-87 psig
there are three basic types of condensers, the air cooled, the water cooled and the - Correct Answer-evaporative cooled
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 - Correct Answer-100 degrees F
The heat removed from the refrigerant by the condenser is - Correct Answer-Both sensible and latent heat.
an energy recovery ventilator is - Correct Answer-an air to air heat exchanger to recover
heat
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