HVAC EXCELLENCE
Heat which causes a change in temperature of a substance is called - ✅✅-sensible
heat,
✅✅
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
Heat which causes a change in temperature of a substance is called - ✅✅-sensible
heat,
✅✅
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
