HVAC AC Excellence Exam with All Correct & 100%
Verified Answers| Actual Complete Update |Latest
Version
Heat which causes a change in temperature of a substance is called ✔Correct Answer-Sensible
Heat
Heat added to a substance without a rise in temperature: (example) liquid refrigerant to gas) this
process is called ✔Correct Answer-Latent Heat of Vaporization
Heat added to a refrigerant in a vapor state after the evaporation process is called? ✔Correct
Answer-Superheat
A scroll compressor mover refrigerant means of? ✔Correct Answer-Involutes spiral
The movement of heat by way of fluid (or air) is called? ✔Correct Answer-Convection
The movement of heat by through a solid object is callled? ✔Correct Answer-Conduction
The standard unit for measuring the quantity of heat in a substance is? ✔Correct Answer-BTU
British Thermal Unit
A refrigerant gives heat when ✔Correct Answer-It Condenses
Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
✔Correct Answer-Prevent Liquid Slugging of the Compressor
The state of the refrigerant in the suction line should be ✔Correct Answer-Low Pressure/ Low
Temperature Vapor
The state of refrigerant entering the condenser is ✔Correct Answer-Low Pressure/ Low
Temperature Vapor
The Evaporator ✔Correct Answer-Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerant? ✔Correct Answer-
Flammability
The sequential order of steps in the evaporator -compressor are? ✔Correct Answer-Compression,
Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaim R-410a refrigerant has been stored over night at 70F, the pressure in
the cylinder should be approximately? ✔Correct Answer-201 psig
Fan air flow pressure are usually measured in? ✔Correct Answer-Inches of Water Column
Zero psia (pounds per square inch absolute) is; ✔Correct Answer-A pressure which cannot be
further reduced
, Zero psia (pounds per square inch absolute) is; ✔Correct Answer-The same as atmospheric
pressure
The temperature at which a moisture will start to socndesne from the air is called? ✔Correct
Answer-Dew Point Temperature
A compound pressure gauges measure? ✔Correct Answer-Pressure and Vacuum
A mechanical shaft is necessary on a? ✔Correct Answer-Hermetic Rotatory Compressor
Liquid Slugging is? ✔Correct Answer-Liquid refrigerant in the compressor clearance space
The clearance space in a reciprocating compressor ✔Correct Answer-Has an effect on compressor
capacity
Which of the following types of air conditioning compressor is most energy efficiency? ✔Correct
Answer-Scroll
Which of the following represents the right order for the function of a condenser? ✔Correct
Answer-De-superheats, Condenses, Subcools
Refrigerant R-134a vapor enters the condenser 124 psig, 100F. It leaves as a liquid from the
condenser sub-cooled 20F and the pressure will be approximately ✔Correct Answer-87 psi
There are three basic types of condensers, the air cooled, the water cooled, and the
______________ cooled? ✔Correct Answer-Evaporative
10 lbs of refrigerant passing through a water cooled condenser will lose 20 btus of heat per lb. If 10
lbs of water passed through the condenser with an entering temperature of 80 F the temperature of
the water leaving the condense is? ✔Correct Answer-100F
The heat removed from the refrigerant by the condenser is ✔Correct Answer-Both Sensible and
Latent Heat
An energy recovery ventilator is ✔Correct Answer-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 ✔Correct
Answer-30 F
when testing the efficiency of a water cooled condenser, the refrigerant condensing temperature
should be approximately _________ higher than the leaving water temperature ✔Correct Answer-
10 F
The first function a condenser must perform is to ___________ the refrigerant before condensing
can occur? ✔Correct Answer-De-superheat
Thermostatic expansion valve is design to maintain ✔Correct Answer-Constant Evaporator
Superheat
Verified Answers| Actual Complete Update |Latest
Version
Heat which causes a change in temperature of a substance is called ✔Correct Answer-Sensible
Heat
Heat added to a substance without a rise in temperature: (example) liquid refrigerant to gas) this
process is called ✔Correct Answer-Latent Heat of Vaporization
Heat added to a refrigerant in a vapor state after the evaporation process is called? ✔Correct
Answer-Superheat
A scroll compressor mover refrigerant means of? ✔Correct Answer-Involutes spiral
The movement of heat by way of fluid (or air) is called? ✔Correct Answer-Convection
The movement of heat by through a solid object is callled? ✔Correct Answer-Conduction
The standard unit for measuring the quantity of heat in a substance is? ✔Correct Answer-BTU
British Thermal Unit
A refrigerant gives heat when ✔Correct Answer-It Condenses
Why must refrigerant in the suction line be slightly warmer than the saturation temperature?
✔Correct Answer-Prevent Liquid Slugging of the Compressor
The state of the refrigerant in the suction line should be ✔Correct Answer-Low Pressure/ Low
Temperature Vapor
The state of refrigerant entering the condenser is ✔Correct Answer-Low Pressure/ Low
Temperature Vapor
The Evaporator ✔Correct Answer-Transfers heat from the refrigerated space to the refrigerant
Which of the following is not a thermodynamic property of refrigerant? ✔Correct Answer-
Flammability
The sequential order of steps in the evaporator -compressor are? ✔Correct Answer-Compression,
Condensation, Expansion, Vaporization
If a 30 pound cylinder of reclaim R-410a refrigerant has been stored over night at 70F, the pressure in
the cylinder should be approximately? ✔Correct Answer-201 psig
Fan air flow pressure are usually measured in? ✔Correct Answer-Inches of Water Column
Zero psia (pounds per square inch absolute) is; ✔Correct Answer-A pressure which cannot be
further reduced
, Zero psia (pounds per square inch absolute) is; ✔Correct Answer-The same as atmospheric
pressure
The temperature at which a moisture will start to socndesne from the air is called? ✔Correct
Answer-Dew Point Temperature
A compound pressure gauges measure? ✔Correct Answer-Pressure and Vacuum
A mechanical shaft is necessary on a? ✔Correct Answer-Hermetic Rotatory Compressor
Liquid Slugging is? ✔Correct Answer-Liquid refrigerant in the compressor clearance space
The clearance space in a reciprocating compressor ✔Correct Answer-Has an effect on compressor
capacity
Which of the following types of air conditioning compressor is most energy efficiency? ✔Correct
Answer-Scroll
Which of the following represents the right order for the function of a condenser? ✔Correct
Answer-De-superheats, Condenses, Subcools
Refrigerant R-134a vapor enters the condenser 124 psig, 100F. It leaves as a liquid from the
condenser sub-cooled 20F and the pressure will be approximately ✔Correct Answer-87 psi
There are three basic types of condensers, the air cooled, the water cooled, and the
______________ cooled? ✔Correct Answer-Evaporative
10 lbs of refrigerant passing through a water cooled condenser will lose 20 btus of heat per lb. If 10
lbs of water passed through the condenser with an entering temperature of 80 F the temperature of
the water leaving the condense is? ✔Correct Answer-100F
The heat removed from the refrigerant by the condenser is ✔Correct Answer-Both Sensible and
Latent Heat
An energy recovery ventilator is ✔Correct Answer-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 ✔Correct
Answer-30 F
when testing the efficiency of a water cooled condenser, the refrigerant condensing temperature
should be approximately _________ higher than the leaving water temperature ✔Correct Answer-
10 F
The first function a condenser must perform is to ___________ the refrigerant before condensing
can occur? ✔Correct Answer-De-superheat
Thermostatic expansion valve is design to maintain ✔Correct Answer-Constant Evaporator
Superheat
