Certification Test for A/C and Heating
Questions with Actual Detailed
Answers 2025-2026 Updated.
Heat flow, Heat absorption, Pressure and Boiling Points - Answer On which of the following
laws of nature is the air-conditioning system based?
D. None of these answers are correct - Answer Which of the following statements is not
correct?
A. Refrigerant leaves the compressor as a high-pressure, high-temperature liquid.
B. Refrigerant leaves the condenser as a low-pressure, high-temperature liquid.
C. Refrigerant returns to the compressor as a low-pressure, high-temperature vapor.
D. None of these answers are correct.
C. The accumulator is located between the condenser and the receiver/dryer. - Answer
Which of the following statements is not correct?
A. The condenser is normally mounted in front of the radiator.
B. The receiver/dryer is a storage tank for liquid refrigerant from the condenser.
C. The accumulator is located between the condenser and the receiver/dryer.
D. All answers are correct
C. R-12 is destructive to Earth's ozone layer - Answer Which of the following statements
concerning R-12 is correct?
A. R-12 is a hydroflurocarbon.
B.R-12 boils at 0 degrees Fahrenheit (-18 Celsius)
C. R-12 is destructive to Earth's ozone layer
D. All answers are correct
Ambient temperature switch, Thermostatic switch, Pressure cycling switch - Answer Which
of the following may be electrically connected in series with the compressor electromagnetic
clutch?
PAG oil - Answer Which of the following oils can be used in an R-134a system?
C. receiver/dryer - Answer A heating system includes all of the following parts except:
A. heater core B. ventilation system
,C. receiver/dryer D. distribution plenum
A. The evaporator changes heated refrigerant to a liquid. - Answer Which of the following
statements is NOT correct?
A. The evaporator changes heated refrigerant to a liquid.
B. Automatic temperature controls maintain a set passenger compartment temperature.
C. Air- conditioning/heater systems can be computer controlled.
D.Heaters and air-conditioners use the same plenum chambers.
cable, thermostat, and vacuum motor - Answer Heater control valves are operated by a
___________________.
-459 degrees Fahrenheit (-273 degrees Celsius) - Answer All materials or substances, as cold
as ________________, have heat in them.
C. Both A and B - Answer Technician A says the thermostatic expansion valve and the fixed
orifice tube perform the same function. Technician B says heat from the evaporator core surface
is lost to the boiling and vaporizing refrigerant. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - Answer Technician A says suction lines connect the accumulator to the
compressor. Technician B says discharge lines connect the compressor to the condenser. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
D. Neither A nor B - Answer Technician A says the normal operating pressures of R-134a are
slightly lower than the pressures of R-12. Technician B says R-134a boils at 134 degrees
Fahrenheit. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
, C. Both A and B - Answer A poor heat condition is being discussed. Technician A says the
coolant level in the engine's cooling system may be low. Technician B says the engine's
thermostat may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
B. High-pressure vapor leaves the evaporator at the top. - Answer Which of the following
statements concerning evaporators is NOT true?
A. Low- pressure liquid enters the evaporator at the bottom.
B. High-pressure vapor leaves the evaporator at the top.
C. The evaporator is located underneath the dash.
D. Air passing over the evaporator loses its heat to the cooler surface of the core.
B. B only - Answer A poor heat condition is being discussed. Tech A says a disconnected
engine vacuum hose could not cause the problem. Tech B says a seized blend door could cause
the problem. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - Answer Tech A says R-12 air-conditioning technicians must be certified.
Tech B says R-12 air-conditioning equipment must be certified. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
A. A only - Answer Tech A says R-12 is a chlorofluorocarbon (CFC) that damages Earth's
ozone layer. Tech B says R-134a is a hydroflurocarbon (HFC) that causes even greater damage.
Who is correct?
A. A only
B. B only
C. Both A and B
Questions with Actual Detailed
Answers 2025-2026 Updated.
Heat flow, Heat absorption, Pressure and Boiling Points - Answer On which of the following
laws of nature is the air-conditioning system based?
D. None of these answers are correct - Answer Which of the following statements is not
correct?
A. Refrigerant leaves the compressor as a high-pressure, high-temperature liquid.
B. Refrigerant leaves the condenser as a low-pressure, high-temperature liquid.
C. Refrigerant returns to the compressor as a low-pressure, high-temperature vapor.
D. None of these answers are correct.
C. The accumulator is located between the condenser and the receiver/dryer. - Answer
Which of the following statements is not correct?
A. The condenser is normally mounted in front of the radiator.
B. The receiver/dryer is a storage tank for liquid refrigerant from the condenser.
C. The accumulator is located between the condenser and the receiver/dryer.
D. All answers are correct
C. R-12 is destructive to Earth's ozone layer - Answer Which of the following statements
concerning R-12 is correct?
A. R-12 is a hydroflurocarbon.
B.R-12 boils at 0 degrees Fahrenheit (-18 Celsius)
C. R-12 is destructive to Earth's ozone layer
D. All answers are correct
Ambient temperature switch, Thermostatic switch, Pressure cycling switch - Answer Which
of the following may be electrically connected in series with the compressor electromagnetic
clutch?
PAG oil - Answer Which of the following oils can be used in an R-134a system?
C. receiver/dryer - Answer A heating system includes all of the following parts except:
A. heater core B. ventilation system
,C. receiver/dryer D. distribution plenum
A. The evaporator changes heated refrigerant to a liquid. - Answer Which of the following
statements is NOT correct?
A. The evaporator changes heated refrigerant to a liquid.
B. Automatic temperature controls maintain a set passenger compartment temperature.
C. Air- conditioning/heater systems can be computer controlled.
D.Heaters and air-conditioners use the same plenum chambers.
cable, thermostat, and vacuum motor - Answer Heater control valves are operated by a
___________________.
-459 degrees Fahrenheit (-273 degrees Celsius) - Answer All materials or substances, as cold
as ________________, have heat in them.
C. Both A and B - Answer Technician A says the thermostatic expansion valve and the fixed
orifice tube perform the same function. Technician B says heat from the evaporator core surface
is lost to the boiling and vaporizing refrigerant. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - Answer Technician A says suction lines connect the accumulator to the
compressor. Technician B says discharge lines connect the compressor to the condenser. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
D. Neither A nor B - Answer Technician A says the normal operating pressures of R-134a are
slightly lower than the pressures of R-12. Technician B says R-134a boils at 134 degrees
Fahrenheit. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
, C. Both A and B - Answer A poor heat condition is being discussed. Technician A says the
coolant level in the engine's cooling system may be low. Technician B says the engine's
thermostat may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
B. High-pressure vapor leaves the evaporator at the top. - Answer Which of the following
statements concerning evaporators is NOT true?
A. Low- pressure liquid enters the evaporator at the bottom.
B. High-pressure vapor leaves the evaporator at the top.
C. The evaporator is located underneath the dash.
D. Air passing over the evaporator loses its heat to the cooler surface of the core.
B. B only - Answer A poor heat condition is being discussed. Tech A says a disconnected
engine vacuum hose could not cause the problem. Tech B says a seized blend door could cause
the problem. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - Answer Tech A says R-12 air-conditioning technicians must be certified.
Tech B says R-12 air-conditioning equipment must be certified. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
A. A only - Answer Tech A says R-12 is a chlorofluorocarbon (CFC) that damages Earth's
ozone layer. Tech B says R-134a is a hydroflurocarbon (HFC) that causes even greater damage.
Who is correct?
A. A only
B. B only
C. Both A and B
