ESCO Air Conditioning Exam – Latest Exam
Prep 2025/2026 | Practice Questions & Study
Guide
Heat which causes a change in temperature of a substance is called - correct
answerSensible heat
Heat added to a substance without a rise in temperature - correct answerLatent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called -
correct answerSuperheat
Scroll compressor move refrigerant by - correct answerInvolute Spirals
The movement of heat by way of fluid is called - correct answerConvection
The movement of heat by direct contact is - correct answerConduction
The standard unit for measuring the quantity of heat in a substance is - correct
answerBTUs
Refrigerant gives up heat when - correct answerIt condenses
Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? - correct answerPrevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be - correct answerLow pressure /
Low temperature vapor
The state of the refrigerant entering the condenser is - correct answerHigh pressure /
Highly superheated vapor
The evaporator - correct answerTransfers heat from the refrigerated space to the
refrigerant
Which of the following is not a thermodynamic property of refrigerants - correct
answerFlammability
, The sequential order of steps in the vapor compressions process are - correct
answerCompression, 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 answer201 psig
Fan airflow pressures are usually measured in - correct answerInches of water column
0 pounds per square inch absolute is - correct answerA pressure which cannot be
further reduced
0 pounds per square inch gauge is - correct answerThe same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - correct
answerDew point temperature
A compound pressure gauge measures - correct answerPressure and vacuum
Mechanical shaft seal is necessary on a - correct answerOpen drive compressor
Liquid slugging is - correct answerLiquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor - correct answerHas an effect on
compressor capacity
Which of the following types of air conditioning compressor is most energy-efficient -
correct answerScroll
Which of the following represent the right order for the functions of a condenser - correct
answerDe-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 - correct
answer87 psig
There are three basic types of condensers, air-cooled, water-cooled and the
_____________ cooled - correct answerEvaporative
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
answer100°F
The heat removed from the refrigerant by the condenser is - correct answerBoth
sensible and latent heat.
Prep 2025/2026 | Practice Questions & Study
Guide
Heat which causes a change in temperature of a substance is called - correct
answerSensible heat
Heat added to a substance without a rise in temperature - correct answerLatent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called -
correct answerSuperheat
Scroll compressor move refrigerant by - correct answerInvolute Spirals
The movement of heat by way of fluid is called - correct answerConvection
The movement of heat by direct contact is - correct answerConduction
The standard unit for measuring the quantity of heat in a substance is - correct
answerBTUs
Refrigerant gives up heat when - correct answerIt condenses
Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? - correct answerPrevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be - correct answerLow pressure /
Low temperature vapor
The state of the refrigerant entering the condenser is - correct answerHigh pressure /
Highly superheated vapor
The evaporator - correct answerTransfers heat from the refrigerated space to the
refrigerant
Which of the following is not a thermodynamic property of refrigerants - correct
answerFlammability
, The sequential order of steps in the vapor compressions process are - correct
answerCompression, 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 answer201 psig
Fan airflow pressures are usually measured in - correct answerInches of water column
0 pounds per square inch absolute is - correct answerA pressure which cannot be
further reduced
0 pounds per square inch gauge is - correct answerThe same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - correct
answerDew point temperature
A compound pressure gauge measures - correct answerPressure and vacuum
Mechanical shaft seal is necessary on a - correct answerOpen drive compressor
Liquid slugging is - correct answerLiquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor - correct answerHas an effect on
compressor capacity
Which of the following types of air conditioning compressor is most energy-efficient -
correct answerScroll
Which of the following represent the right order for the functions of a condenser - correct
answerDe-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 - correct
answer87 psig
There are three basic types of condensers, air-cooled, water-cooled and the
_____________ cooled - correct answerEvaporative
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
answer100°F
The heat removed from the refrigerant by the condenser is - correct answerBoth
sensible and latent heat.
