ESCO Air Conditioning Exam- Questions Answered Exactly New Version (2024-2025)
Heat which causes a change in temperature of a substance is called - Answers Sensible heat
Heat added to a substance without a rise in temperature - Answers Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called - Answers
Superheat
Scroll compressor move refrigerant by - Answers Involute Spirals
The movement of heat by way of fluid is called - Answers Convection
The movement of heat by direct contact is - Answers Conduction
The standard unit for measuring the quantity of heat in a substance is - Answers BTUs
Refrigerant gives up heat when - Answers It condenses in the condenser and gives up heat
Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - Answers
To Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be - Answers Low pressure / Low temperature
Superheated vapor
The state of the refrigerant entering the condenser is - Answers High pressure / Highly superheated
vapor
The evaporator - Answers Transfers heat from the refrigerated space to the refrigerant
Thermodynamic properties of refrigerants are Critical Point, Saturation Point, Enthalpy but not what? -
Answers Flammability
The sequential order of steps in the vapor compressions process are - Answers 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 - Answers 201 psig
Fan airflow pressures are usually measured in - Answers Inches of water column
0 pounds per square inch absolute is - Answers A pressure which cannot be further reduced
0 pounds per square inch gauge is - Answers The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - Answers Dew point
temperature
A compound pressure gauge measures - Answers Pressure and vacuum
, Mechanical shaft seal is necessary on a - Answers Open drive compressor
Liquid slugging is - Answers Liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor - Answers Has an effect on compressor capacity
Which of the following types of air conditioning compressor is most energy-efficient - Answers
Centrifugal
Which of the following represent the right order for the functions of a condenser - Answers 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 - Answers 87 psig
There are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled -
Answers 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 - Answers 100°F
The heat removed from the refrigerant by the condenser is - Answers Both sensible and latent heat.
An energy recovery ventilator is - Answers 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 - Answers 30°F
When testing the efficiency of a water-cooled condenser, the refrigerant condensing temperature
should be approximately _________ higher than the leaving water temperature - Answers 10°F
The first function condenser must perform is to - Answers De-superheat
A thermostatic expansion valve is designed to maintain - Answers Constant evaporator superheat
The automatic expansion valve is designed to maintain - Answers Constant evaporator pressure
The thermostatic expansion valve has three operating pressures - Answers Evaporator pressure, Spring
pressure, and Sensor bulb pressure
When mounting a thermostatic expansion valve sensor bulb, which of the following is not true - Answers
It must be installed lower than the valve body
In an air conditioning system that uses a thermostatic expansion valve, the temperature of the
evaporator outlet will usually be - Answers Warmer than the evaporator inlet
In automatic expansion valve is best suited - Answers When the system load remains fairly constant
Heat which causes a change in temperature of a substance is called - Answers Sensible heat
Heat added to a substance without a rise in temperature - Answers Latent heat
Heat added to the refrigerant in a vapor state after the evaporation process is called - Answers
Superheat
Scroll compressor move refrigerant by - Answers Involute Spirals
The movement of heat by way of fluid is called - Answers Convection
The movement of heat by direct contact is - Answers Conduction
The standard unit for measuring the quantity of heat in a substance is - Answers BTUs
Refrigerant gives up heat when - Answers It condenses in the condenser and gives up heat
Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - Answers
To Prevent liquid slugging of the compressor
The state of the refrigerant in the suction line should be - Answers Low pressure / Low temperature
Superheated vapor
The state of the refrigerant entering the condenser is - Answers High pressure / Highly superheated
vapor
The evaporator - Answers Transfers heat from the refrigerated space to the refrigerant
Thermodynamic properties of refrigerants are Critical Point, Saturation Point, Enthalpy but not what? -
Answers Flammability
The sequential order of steps in the vapor compressions process are - Answers 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 - Answers 201 psig
Fan airflow pressures are usually measured in - Answers Inches of water column
0 pounds per square inch absolute is - Answers A pressure which cannot be further reduced
0 pounds per square inch gauge is - Answers The same as atmospheric pressure
The temperature at which moisture will start to condense from the air is called - Answers Dew point
temperature
A compound pressure gauge measures - Answers Pressure and vacuum
, Mechanical shaft seal is necessary on a - Answers Open drive compressor
Liquid slugging is - Answers Liquid refrigerant in the compressor clearance space
The clearance space in reciprocating compressor - Answers Has an effect on compressor capacity
Which of the following types of air conditioning compressor is most energy-efficient - Answers
Centrifugal
Which of the following represent the right order for the functions of a condenser - Answers 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 - Answers 87 psig
There are three basic types of condensers, air-cooled, water-cooled and the _____________ cooled -
Answers 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 - Answers 100°F
The heat removed from the refrigerant by the condenser is - Answers Both sensible and latent heat.
An energy recovery ventilator is - Answers 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 - Answers 30°F
When testing the efficiency of a water-cooled condenser, the refrigerant condensing temperature
should be approximately _________ higher than the leaving water temperature - Answers 10°F
The first function condenser must perform is to - Answers De-superheat
A thermostatic expansion valve is designed to maintain - Answers Constant evaporator superheat
The automatic expansion valve is designed to maintain - Answers Constant evaporator pressure
The thermostatic expansion valve has three operating pressures - Answers Evaporator pressure, Spring
pressure, and Sensor bulb pressure
When mounting a thermostatic expansion valve sensor bulb, which of the following is not true - Answers
It must be installed lower than the valve body
In an air conditioning system that uses a thermostatic expansion valve, the temperature of the
evaporator outlet will usually be - Answers Warmer than the evaporator inlet
In automatic expansion valve is best suited - Answers When the system load remains fairly constant
