HVAC EXCELLENCE FINAL TEST 2026
QUESTIONS WITH CORRECT ANSWERS
GRADED A+
◍ The only way to minimize flash gas is by.
Answer: Sub-cooling the liquid refrigerant entering the metering device
closer to the evaporator temperature.
◍ When using an electronic leak detector the sensing probe..
Answer: Should be moved at approximately 1 inch every second.
◍ A decrease in superheat causes the thermostatic expansion valve begins to..
Answer: Close
◍ A partially clogged capillary tube metering device can cause.
Answer: A starved evaporator
◍ The heat removed from the refrigerant by the condenser is..
Answer: Both sensible and latent heat
◍ Zero psig ( pounds per square inch gauge) is..
Answer: The same as atmospheric pressure
◍ A refrigerant gives up heat when it..
Answer: It condenses
◍ A compressor that has broken reed valve will cause these symptoms..
Answer: High suction pressure and low discharge pressure
◍ Moisture in the refrigeration system will cause.
Answer: Compressor failure
◍ Solid contaminants such as sludge and carbon from a severe hermetic
compressor motor burn out are best removed.
, Answer: By flushing the system and then Installing filter/driers in both the
liquid and suction lines.
◍ A mechanical shaft seal is necessary on a.
Answer: Open drive compressor / external force
◍ An automatic expansion valve is best suited / down flow , constant pressure
valve..
Answer: When the system load remains fairly constant
◍ Which of the following is not a thermodynamic property of refrigerant..
Answer: Flammability
◍ The flow rate of a TXV used in R410A systems as compared to R22 system
is..
Answer: Approximately 15% lower
◍ In order to remove as much moisture as possible from a system..
Answer: Triple evacuate the system to 500 microns with a deep vacuum
pump
◍ Which of the following types of air conditioning compressors is most energy
efficient.
Answer: Centrifugal ( BTU/Kilo watts )
◍ Fan airflow pressures are usually measured in..
Answer: Inches of water column (WC)
◍ The R410A compound gauge reads 124 psig and the suction line
temperature at the condensing unit is 54 degrees
F. What is the operating system superheat?.
Answer: 12 ' F
◍ The standard unit for measuring the QUANTITY of heat in a substance is
(intensity would be temp).
Answer: British thermal unit
◍ A faulty condenser fan motor on an air conditioning system will cause these
symptoms.
QUESTIONS WITH CORRECT ANSWERS
GRADED A+
◍ The only way to minimize flash gas is by.
Answer: Sub-cooling the liquid refrigerant entering the metering device
closer to the evaporator temperature.
◍ When using an electronic leak detector the sensing probe..
Answer: Should be moved at approximately 1 inch every second.
◍ A decrease in superheat causes the thermostatic expansion valve begins to..
Answer: Close
◍ A partially clogged capillary tube metering device can cause.
Answer: A starved evaporator
◍ The heat removed from the refrigerant by the condenser is..
Answer: Both sensible and latent heat
◍ Zero psig ( pounds per square inch gauge) is..
Answer: The same as atmospheric pressure
◍ A refrigerant gives up heat when it..
Answer: It condenses
◍ A compressor that has broken reed valve will cause these symptoms..
Answer: High suction pressure and low discharge pressure
◍ Moisture in the refrigeration system will cause.
Answer: Compressor failure
◍ Solid contaminants such as sludge and carbon from a severe hermetic
compressor motor burn out are best removed.
, Answer: By flushing the system and then Installing filter/driers in both the
liquid and suction lines.
◍ A mechanical shaft seal is necessary on a.
Answer: Open drive compressor / external force
◍ An automatic expansion valve is best suited / down flow , constant pressure
valve..
Answer: When the system load remains fairly constant
◍ Which of the following is not a thermodynamic property of refrigerant..
Answer: Flammability
◍ The flow rate of a TXV used in R410A systems as compared to R22 system
is..
Answer: Approximately 15% lower
◍ In order to remove as much moisture as possible from a system..
Answer: Triple evacuate the system to 500 microns with a deep vacuum
pump
◍ Which of the following types of air conditioning compressors is most energy
efficient.
Answer: Centrifugal ( BTU/Kilo watts )
◍ Fan airflow pressures are usually measured in..
Answer: Inches of water column (WC)
◍ The R410A compound gauge reads 124 psig and the suction line
temperature at the condensing unit is 54 degrees
F. What is the operating system superheat?.
Answer: 12 ' F
◍ The standard unit for measuring the QUANTITY of heat in a substance is
(intensity would be temp).
Answer: British thermal unit
◍ A faulty condenser fan motor on an air conditioning system will cause these
symptoms.
