HVAC Excellence 2026 | Complete
Revision Pack | Grade A+
• 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
Revision Pack | Grade A+
• 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
