HVAC EXCELLENCE COMPREHENSIVE
STUDY GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Any material that will readily release electrons is called;.
Answer: A conductor
◍ Single phase motor speed is determined by the..
Answer: number of stator poles.
◍ On a good single-phase compressor motor, which winding terminals have
the highest resistance?.
Answer: run to start.
◍ Water will vaporize at _______ temperature in a 28 in hg vacuum.
Answer: 100f
◍ to control capacity, the hot gas from the bypass valve is piped into the.
Answer: evaporator outlet
◍ Nonpositive Displacement Compressors are also known as?.
Answer: Centrifugal compressors
◍ When testing the efficiency of a water-cooled condenser, the refrigerant
condensing temperature should be approximately ______ higher than the
leaving water temperature?.
Answer: 10f
◍ When testing the efficiency of an air-cooled condenser, the refrigerant
condensing temperature should be approximately ______ higher than the
entering air temperature.
Answer: 5 F - 20 F
◍ The evaporator.
, Answer: Transfers heat from the refrigerated space (example: your home) to
the refrigerant
◍ During the off-cycle, a capillary tube metering device system will continue
to feed the evaporator until the.
Answer: high and low pressures regulate
◍ When using an electronic leak detector, the sensor probe?.
Answer: Should be moved at approximately 1 inch every 2 seconds.
◍ In the schematic, what voltage would be found across the condenser fan
motor?.
Answer: O volts,
◍ If a compressor has a severe burnout, to rid the system of acid use.
Answer: An acid core suction line drier
◍ Which of the following is not a symptom of a hermetic system that is low on
a refrigerant?.
Answer: High Head Pressure
◍ When setting a high pressure cut-out on a R-22 system which has an air
cooled condenser, the setting should be approximately.
Answer: 400psi
◍ Which of the following in not a factor in determining impedance in an AC
circuit?.
Answer: Frequency
◍ After a system has been opened and the compressor changed, the service
technician must.
Answer: Replace the filter dryer, leaks check, evacuate and charge
◍ What is the purpose of a distributor? It evenly feeds refrigerant to.
Answer: the evaporator
◍ What is a nonpositive displacement compressor?.
Answer: Do not fill the gas space with something else. These machines
operate like giant fans or turbines turning at very high speeds.
,◍ If the cut-off plate is removed from a blower assembly, how would this
effect blower performance?.
Answer: It would reduce air flow
◍ In the schematic, what voltage would be found from terminal Y to the
output side of the coil on line #11?.
Answer: 0 volts
◍ When is the installation of a P trap mandatory in a drain line? When the
evaporator.
Answer: coil is located on the negative side of the blower
◍ In electrical wiring, a black colored wire in an alternating current circuit
usually indicates;.
Answer: the hot conductor.
◍ Air or other non-condensable gases in a capillary tube air conditioning
system will cause these symptoms.
Answer: High suction pressure and high discharge pressure
◍ Heat added to refrigerant in a vapor state after the evaporation process is
called.
Answer: Super Heat
◍ A refrigerant gives heat when?.
Answer: It condenses
◍ Fan airflow pressure are usually measured in?.
Answer: Inches of Water Column (WC)
◍ What are some water cooled systems sources?.
Answer: 1. Wastewater system2. Open loop cooling towers3. Closed loop
cooling towers
◍ To change direction of rotation of a three phase motor..
Answer: change the position of any two supply wires.
◍ How many Watts of Power are used by a heater operating at 460 Volts and
, drawing 5 Amps?.
Answer: 2,300 Watts
◍ While troubleshooting a residential split system, the service technician finds
low operating pressures and low system amperage draw, this could be an
indication of?.
Answer: Low airflow across the evaporator
◍ The Capacity of a cooling tower depends on the.
Answer: Entering Wet Bulb Temperature
◍ A technician has found an air conditioning system with a leak in the liquid
line. After the line is repaired the system is evacuated and properly
recharged. When the system is started, the compressor is noisy and running
hot. The most probable cause is?.
Answer: Low oil in the system
◍ That the temperature is below the Dew Point and below 32'
F. .
Answer: Frost on the suction line indicates __________________.
◍ The capacitor start-capacitor run (CSCR) motor provides;.
Answer: high starting and running torque.
◍ The purpose of an evaporator pressure regulating valve (EPR) is to?.
Answer: Prevent Evaporator pressures from falling below a set limit
◍ Manu multi-cylinder reciprocating compressors have a capacity control
device called.
Answer: an unloader
◍ An oil trap installed in the vertical riser is intended to.
Answer: Help move oil through the system
◍ In multiple compressor application, liquid lines enter a common header at
the _____ of the header.
Answer: Bottom
◍ How many watts of power are used by a heater operating at 240 volts and
STUDY GUIDE 2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ Any material that will readily release electrons is called;.
Answer: A conductor
◍ Single phase motor speed is determined by the..
Answer: number of stator poles.
◍ On a good single-phase compressor motor, which winding terminals have
the highest resistance?.
Answer: run to start.
◍ Water will vaporize at _______ temperature in a 28 in hg vacuum.
Answer: 100f
◍ to control capacity, the hot gas from the bypass valve is piped into the.
Answer: evaporator outlet
◍ Nonpositive Displacement Compressors are also known as?.
Answer: Centrifugal compressors
◍ When testing the efficiency of a water-cooled condenser, the refrigerant
condensing temperature should be approximately ______ higher than the
leaving water temperature?.
Answer: 10f
◍ When testing the efficiency of an air-cooled condenser, the refrigerant
condensing temperature should be approximately ______ higher than the
entering air temperature.
Answer: 5 F - 20 F
◍ The evaporator.
, Answer: Transfers heat from the refrigerated space (example: your home) to
the refrigerant
◍ During the off-cycle, a capillary tube metering device system will continue
to feed the evaporator until the.
Answer: high and low pressures regulate
◍ When using an electronic leak detector, the sensor probe?.
Answer: Should be moved at approximately 1 inch every 2 seconds.
◍ In the schematic, what voltage would be found across the condenser fan
motor?.
Answer: O volts,
◍ If a compressor has a severe burnout, to rid the system of acid use.
Answer: An acid core suction line drier
◍ Which of the following is not a symptom of a hermetic system that is low on
a refrigerant?.
Answer: High Head Pressure
◍ When setting a high pressure cut-out on a R-22 system which has an air
cooled condenser, the setting should be approximately.
Answer: 400psi
◍ Which of the following in not a factor in determining impedance in an AC
circuit?.
Answer: Frequency
◍ After a system has been opened and the compressor changed, the service
technician must.
Answer: Replace the filter dryer, leaks check, evacuate and charge
◍ What is the purpose of a distributor? It evenly feeds refrigerant to.
Answer: the evaporator
◍ What is a nonpositive displacement compressor?.
Answer: Do not fill the gas space with something else. These machines
operate like giant fans or turbines turning at very high speeds.
,◍ If the cut-off plate is removed from a blower assembly, how would this
effect blower performance?.
Answer: It would reduce air flow
◍ In the schematic, what voltage would be found from terminal Y to the
output side of the coil on line #11?.
Answer: 0 volts
◍ When is the installation of a P trap mandatory in a drain line? When the
evaporator.
Answer: coil is located on the negative side of the blower
◍ In electrical wiring, a black colored wire in an alternating current circuit
usually indicates;.
Answer: the hot conductor.
◍ Air or other non-condensable gases in a capillary tube air conditioning
system will cause these symptoms.
Answer: High suction pressure and high discharge pressure
◍ Heat added to refrigerant in a vapor state after the evaporation process is
called.
Answer: Super Heat
◍ A refrigerant gives heat when?.
Answer: It condenses
◍ Fan airflow pressure are usually measured in?.
Answer: Inches of Water Column (WC)
◍ What are some water cooled systems sources?.
Answer: 1. Wastewater system2. Open loop cooling towers3. Closed loop
cooling towers
◍ To change direction of rotation of a three phase motor..
Answer: change the position of any two supply wires.
◍ How many Watts of Power are used by a heater operating at 460 Volts and
, drawing 5 Amps?.
Answer: 2,300 Watts
◍ While troubleshooting a residential split system, the service technician finds
low operating pressures and low system amperage draw, this could be an
indication of?.
Answer: Low airflow across the evaporator
◍ The Capacity of a cooling tower depends on the.
Answer: Entering Wet Bulb Temperature
◍ A technician has found an air conditioning system with a leak in the liquid
line. After the line is repaired the system is evacuated and properly
recharged. When the system is started, the compressor is noisy and running
hot. The most probable cause is?.
Answer: Low oil in the system
◍ That the temperature is below the Dew Point and below 32'
F. .
Answer: Frost on the suction line indicates __________________.
◍ The capacitor start-capacitor run (CSCR) motor provides;.
Answer: high starting and running torque.
◍ The purpose of an evaporator pressure regulating valve (EPR) is to?.
Answer: Prevent Evaporator pressures from falling below a set limit
◍ Manu multi-cylinder reciprocating compressors have a capacity control
device called.
Answer: an unloader
◍ An oil trap installed in the vertical riser is intended to.
Answer: Help move oil through the system
◍ In multiple compressor application, liquid lines enter a common header at
the _____ of the header.
Answer: Bottom
◍ How many watts of power are used by a heater operating at 240 volts and
