HVAC Excellence [2026/2027] | UPDATED
ACTUAL Exam Question and Answer | A+
Verified
• Heat added to a substance without a rise in temperature; (example: liquid refrigerant to
gas) this process la called? -✓✓ latent heat
• Heat added to the refrigerant in vapor state after the evaporation process is called, -
✓✓ superheat
• A scroll compressor moves refrigerant by means of; -✓✓ involute spirals
• The movement of heat by way of fluid or is called; air -✓✓ convection
• The movement of heat through a solid object is called; -✓✓ radiation
• The standard unit for measuring the quantity of heat in a substance is -✓✓ British
Thermal Unit
• A refrigerant gives up heat when it; -✓✓ it condenses
• Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? -✓✓ prevent liquid slugging of the compressor.
• It is desirable for refrigerant in the suction line to be slightly superheated in order to; -
✓✓ insure liquid refrigerant does not enter the compressor.,
• The state of the refrigerant in the suction line should be -✓✓ low pressure/ low
temperature vapor
• The state of the refrigerant entering the condenser is -✓✓ High Pressure/ Highly
Superheated Vapor
• The Evaporator -✓✓ Transfers heat from the refrigerated space to the refrigerant
• The Evaporator -✓✓ Transfers heat from the refrigerated space to the refrigerant
• Which of the following is not a Thermodynamic Property of refrigerant -✓✓
Flammability
• The sequential order of steps in the vapor-compression process are: -✓✓
Compression, Condensation, Expansion, Vaporization
, • If a 30 lb container of $-410A refrigerant has been stored over night at 70 degrees F,
the pressure in the cylinder should be approximately -✓✓ 201 Degrees Faranheit
• Fan Airflow pressures are usually measured in -✓✓ Inches of water column
• Zero Psia (pounds per square inch absolute) is -✓✓ a pressure which cannot be
further reduced
• Zero Psig (pounds per square inch gauge) -✓✓ The same as atmospheric pressure
• The Temperature at which moisture will start to condense from the air is called -✓✓
Dew Point Temperature
• A Compound pressure gauge measures -✓✓ Pressure and Vacuum
• A Mechanical shaft seal is necesssary on a -✓✓ Open drive compressor
• Liquid slugging is -✓✓ Liquid refrigerant in the compressor clearance space
• The Clearance space in a reciprocating compressor -✓✓ has an effect on compressor
capacity
• Which of the following types of air conditioning compressors is more efficient -✓✓
Centrifugal
• Which of the following represnet the right order for the functionsof a condenser -✓✓
De-Superheats, Condenses, and Sub-cools
• Refrigerant R-134a vapor enters the condenser at 124psig, 100 degrees faranheit, It
leaves as a liquid from the condenser, sub-cooled 20 degrees faranheit, and the
pressure will be approximately -✓✓ 124 psig
• There are 3 basic types of condensers, air cooled, water cooled, and -✓✓ evaporative
cooled
• 10 lbs of refrigerant passing through a water cooled condenser will lose 20 BTU of
heat/ pound. If 10#'s of water passes through the condenser with an entering temp of 80
degrees, the temp of the water leaving the condenser is -✓✓ 100 degrees faranheit
• The heat removed from the refrigerant by the condenser is -✓✓ both sensible and
latent heat
• An energy recovery ventilator is -✓✓ an air to air heat exhanger to recover heat
ACTUAL Exam Question and Answer | A+
Verified
• Heat added to a substance without a rise in temperature; (example: liquid refrigerant to
gas) this process la called? -✓✓ latent heat
• Heat added to the refrigerant in vapor state after the evaporation process is called, -
✓✓ superheat
• A scroll compressor moves refrigerant by means of; -✓✓ involute spirals
• The movement of heat by way of fluid or is called; air -✓✓ convection
• The movement of heat through a solid object is called; -✓✓ radiation
• The standard unit for measuring the quantity of heat in a substance is -✓✓ British
Thermal Unit
• A refrigerant gives up heat when it; -✓✓ it condenses
• Why must refrigerant in the suction line be slightly warmer than the saturation
temperature? -✓✓ prevent liquid slugging of the compressor.
• It is desirable for refrigerant in the suction line to be slightly superheated in order to; -
✓✓ insure liquid refrigerant does not enter the compressor.,
• The state of the refrigerant in the suction line should be -✓✓ low pressure/ low
temperature vapor
• The state of the refrigerant entering the condenser is -✓✓ High Pressure/ Highly
Superheated Vapor
• The Evaporator -✓✓ Transfers heat from the refrigerated space to the refrigerant
• The Evaporator -✓✓ Transfers heat from the refrigerated space to the refrigerant
• Which of the following is not a Thermodynamic Property of refrigerant -✓✓
Flammability
• The sequential order of steps in the vapor-compression process are: -✓✓
Compression, Condensation, Expansion, Vaporization
, • If a 30 lb container of $-410A refrigerant has been stored over night at 70 degrees F,
the pressure in the cylinder should be approximately -✓✓ 201 Degrees Faranheit
• Fan Airflow pressures are usually measured in -✓✓ Inches of water column
• Zero Psia (pounds per square inch absolute) is -✓✓ a pressure which cannot be
further reduced
• Zero Psig (pounds per square inch gauge) -✓✓ The same as atmospheric pressure
• The Temperature at which moisture will start to condense from the air is called -✓✓
Dew Point Temperature
• A Compound pressure gauge measures -✓✓ Pressure and Vacuum
• A Mechanical shaft seal is necesssary on a -✓✓ Open drive compressor
• Liquid slugging is -✓✓ Liquid refrigerant in the compressor clearance space
• The Clearance space in a reciprocating compressor -✓✓ has an effect on compressor
capacity
• Which of the following types of air conditioning compressors is more efficient -✓✓
Centrifugal
• Which of the following represnet the right order for the functionsof a condenser -✓✓
De-Superheats, Condenses, and Sub-cools
• Refrigerant R-134a vapor enters the condenser at 124psig, 100 degrees faranheit, It
leaves as a liquid from the condenser, sub-cooled 20 degrees faranheit, and the
pressure will be approximately -✓✓ 124 psig
• There are 3 basic types of condensers, air cooled, water cooled, and -✓✓ evaporative
cooled
• 10 lbs of refrigerant passing through a water cooled condenser will lose 20 BTU of
heat/ pound. If 10#'s of water passes through the condenser with an entering temp of 80
degrees, the temp of the water leaving the condenser is -✓✓ 100 degrees faranheit
• The heat removed from the refrigerant by the condenser is -✓✓ both sensible and
latent heat
• An energy recovery ventilator is -✓✓ an air to air heat exhanger to recover heat
