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ESCO Air Conditioning Exam Questions & 100% Verified Answers | Latest Update 2025/2026, Exams of Refrigeration and Air Conditioning

Heat which causes a change in temperature of a substance is called : Sensible heat

Typology: Exams

2024/2025

Available from 02/20/2025

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ESCO Air Conditioning Exam Questions &
100% Verified Answers | Latest Update | Already
Graded A+
Heat which causes a change in temperature of a substance is called
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: Sensible heat
Heat added to a substance without a rise in temperature
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: Superheat
Scroll compressor move refrigerant by
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: Involute Spirals
The movement of heat by way of fluid is called
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: Convection
The movement of heat by direct contact is
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: Conduction
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ESCO Air Conditioning Exam Questions &

100% Verified Answers | Latest Update | Already

Graded A+

Heat which causes a change in temperature of a substance is called ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Sensible heat Heat added to a substance without a rise in temperature ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Superheat Scroll compressor move refrigerant by ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Involute Spirals The movement of heat by way of fluid is called ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Convection The movement of heat by direct contact is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Conduction

The standard unit for measuring the quantity of heat in a substance is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : BTUs Refrigerant gives up heat when ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : It condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Prevent liquid slugging of the compressor The state of the refrigerant in the suction line should be ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Low pressure / Low temperature vapor The state of the refrigerant entering the condenser is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : High pressure / Highly superheated vapor The evaporator ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Transfers heat from the refrigerated space to the refrigerant Which of the following is not a thermodynamic property of refrigerants ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Flammability

Mechanical shaft seal is necessary on a ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Open drive compressor Liquid slugging is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Liquid refrigerant in the compressor clearance space The clearance space in reciprocating compressor ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Has an effect on compressor capacity Which of the following types of air conditioning compressor is most energy-efficient ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Scroll Which of the following represent the right order for the functions of a condenser ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : De-superheat, Condenses, Subcools Refrigerant R 134a vapor enters the condenser at 124 psi G, 100ยฐF. it leaves as a liquid from the condenser subcooled 20ยฐF and the pressure will be approximately ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 87 psig There are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled

๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 80ยฐF the temperature of the water leaving the condenser is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 100ยฐF The heat removed from the refrigerant by the condenser is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Both sensible and latent heat. An energy recovery ventilator is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : an air to air heat exchanger to recover heat When testing the efficiency of an air-cooled condenser, the refrigerant condensing temperature should be approximately ________ higher than the entering air temperature ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 30ยฐF When testing the efficiency of a water-cooled condenser, the refrigerant condensing temperature should be approximately _________ higher than the leaving water temperature ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 10ยฐF

Which of the following is not true of a capillary tube metering device ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : They maintain a constant evaporator temperature A decrease in superheat causes the thermostatic expansion valve to begin to ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Close A rise in evaporator pressure causes the automatic expansion valve to begin to ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Close A thermal electric expansion valve is controlled by ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : NTC thermistor In a direct expansion evaporator system, the refrigerant enters the evaporator as ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A mixture of liquid with some "flash-gas" Which of the following is the most important consideration in the selection of an evaporator coil. Match the coil to the ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Condensing unit and the latent/sensible loads In the evaporator ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Latent heat is transferred from the refrigerated space to the refrigerant

A liquid line filter-drier should be placed between the ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Condenser and the Metering device The only way to minimize flash gas is by ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Sub-cooling the liquid refrigerant entering the metering device closer to the evaporator temperature A liquid receiver is used to ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : store liquid refrigerant An accumulator is used to ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Prevent liquid refrigerant from reaching the compressor A sight glass would be normally located ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : in the liquid line before the metering device Bubbles in a sight glass would be an indication of ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : TXV with an excessive superheat setting The oil separator is installed in the ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Discharge Line

The flow rate of a TXV is used in R 410A systems as compared to R22 systems is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Approximately 15% greater When using an electronica leak detector the sensor probe ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : should be moved at approximately 1 inch for every two seconds Moisture in a refrigeration system will cause ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Compressor failure In order to remove as much moisture as possible from a system ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : triple evacuate the system to 500 microns with a deep vacuum pump what type of gauge is used to measure microns ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : an electronic vacuum gauge Water will vaporize at ________ temperature in a 28 in hg vacuum ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 10ยฐF After a system has been opened and the compressor changed the service technician must ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Replace the filter dryer, leak check, evacuate, and charge

Back seating a two-way service valve results in ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Open service port with normal system flow The R- 41 0 a compound gauge reads 124 psig in the suction line temperature at the condensing unit is 54ยฐF. What is the operating system superheat ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 12ยฐF When topping off an operating system containing a blended refrigerant ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : introduce the refrigerant as a liquid into the low side using the throttling valve A partially clogged capillary tube can cause ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : A starved evaporator The r134a0 for a high-pressure gauge reads 146 psig in the liquid line temperature at the condensing unit is 95ยฐF. What is the operating system subcooling ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 15ยฐF An overcharge of refrigerant will cause ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : increased head pressure A customer complains that their air conditioning system is running constantly, but no cooling enough. The suction line is very cold in the compressor is sweating. The most likely cause is

In inefficient compressor is usually indicated by ________ Head pressure and ________ Suction pressure ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Higer than normal/ Lower than normal Which of the following is not a symptom of hermetic system that is low on refrigerant ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : High head pressure Frost on the suction line indicates ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : That its temperature is below the dew point and its below 32 degrees An increase in head pressure causes___refrigerant to flow through a capillary tube ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : More With an automatic expansion valve, an increase in evaporator load will cause the ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Automatic expansion valve to close When a TEV or capillary tube is used as a metering device a low refrigerant charge will cause ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Low head pressure What is the maximum operating pressure setting for an acetylene torch ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 15 psig

When connecting copper to steal the recommended brazing filler alloy is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 45% silver alloy Solid contaminants such as sludge and carbon from a severe hermetic compressor motor burn out are best removed ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : By flushing the system and then installing filter dryers in both the liquid and suction lines If the cut off play is removed from the blower assembly how will this affect blower performance ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : It would reduce airflow At a residential service call no cooling complaint, the service technician finds the unit to be completely out of refrigerant. The technician decides to use a trace amount of refrigerant and___in order to pressurize the system ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Inert gas A technician has found an air-conditioning system with a leak in the liquid line. After the line is repaired the system is evacuated in properly recharged. When the system restarted the compressor is noisy and running hot. The most probable cause of the noise is ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Low oil in the system

A TEV sensing bulb which becomes detached from the suction line will cause the symptoms ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : High suction pressure and lower than normal discharge pressure A faulty condenser fan motor on an air conditioning system will cause the symptoms ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : High suction pressure and high discharge pressure A dirty evaporator in an air conditioning system will cause the symptoms ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : Low suction pressure and low discharge pressure