AC final test Questions with 100% Correct Answers | Verified | Latest Update
During a routine fluid level inspection a radiator is found to be low on coolant. Technician A says that a
faulty radiator cap could be the cause. Technician B says that a cracked radiator to recovery tank hose
could be the cause. Who is correct? - ✔✔Both A and B
The Clean Air Act is being discussed. Technician A says the Montreal Protocol is one of the results of the
Clean Air Act. Technician B says it gave the EPA authority to control refrigerants in order to protect the
environment. Who is correct? - ✔✔Both A and B
After a vehicle has been driven for 10-15 miles, the heater still continues to blow cool air. Which of the
following is the most likely cause? - ✔✔Partially blocked heater core
How is heat transfer by convection accomplished? - ✔✔Heat travels through the surrounding air.
All of the following statements about the air conditioning circuit are true, EXCEPT: - ✔✔Heat transfer is
accomplished by two pressure and two temperature systems
Technician A says latent heat is hidden heat. Technician B says latent heat is required for a change of
state. Who is correct? - ✔✔Both A and B
Technician A says latent heat is hidden heat. Technician B says latent heat is required for a change of
state. Who is correct? - ✔✔Both A and B
Technician A says shop ventilation is not needed when working on new vehicles because new-vehicle
emissions are low. Technician B says the shop's ventilation system should be connected to the exhaust
pipe if the engine is running. Who is correct? - ✔✔Technician B only
All of the following conditions could cause poor passenger compartment heating system performance
EXCEPT - ✔✔Thermostat stuck in the closed position.
The metering device changes high-pressure liquid into a - ✔✔low-pressure liquid
,Technician A says the compressor is the dividing line of the refrigeration system, low- to high-side.
Technician B says the metering device is the dividing line of the refrigeration system, high- to low-side.
Who is correct? - ✔✔Both A and B
Technician A says that when working on a refrigerant system you should work in a well-ventilated area.
Technician B says to determine the type of refrigerant used in a system, a refrigerant identifier should be
used prior to servicing the vehicles refrigerant system. Who is correct? - ✔✔Both A and B
Technician A says you should always disconnect the power source while working on electric cooling fan
motors. Technician B says it is safe to work on electric cooling fan motors when the ignition switch is off.
Who is correct? - ✔✔Technician A only
All of the follow are true about engine thermostats EXCEPT: - ✔✔A thermostat should be removed from
a system if it is running hot
Where in the system is the receiver dryer located? - ✔✔on the outlet of the condenser.
Technician A says the air conditioning system is designed to remove heat from the passenger
compartment. Technician B says the air conditioning system is designed to transfer heat absorbed to the
outside air. Who is correct? - ✔✔Both A and B
Technician A says UV radiation inhibits the human body's immune system and causes skin tissue damage.
Technician B says the release of CFCs into the atmosphere could help increase the greenhouse effect.
Who is correct? - ✔✔Both A and B
Technician A says that serpentine belts made of EPDM resist cracking and instead exhibit wear to the
belt ribs similar to tire wear and that a depth gauge should be used to assess belt wear. Technician B says
that as a neoprene serpentine belt ages and wears that cracks will form on the belt ribs and that if there
are more than 3 cracks in a 3 inch span the belt should be replaced. Who is correct? - ✔✔Both A and B
Technician A says a defective radiator cap vacuum valve may cause hoses to collapse. Technician B says a
defective pressure valve may cause coolant boil over and loss. Who is correct? - ✔✔Both A and B
, The compressor changes a low-pressure vapor to - ✔✔a high-pressure vapor.
Hydrostatic pressure is being discussed. Technician A says the pressure in a tank will increase as the
liquid cools. Technician B says the containment system (tanks and lines) must withstand the changing
pressures created as the liquid changes states. Who is correct? - ✔✔Technician B only
Technician A says that the accumulator is on the high-pressure side of the refrigerant system. Technician
B says that the receiver-drier is attached to the evaporator outlet on the refrigerant system. Who is
correct? - ✔✔Neither A nor B
Performance testing on air conditioning is being discussed. Technician A says the engine should be
operated at speeds over 3,000 rpm during the test. Technician B says a fan should be used to force air
through the condenser and radiator. Who is correct? - ✔✔Technician B only
What affect does the receiver dryer have on the refrigerant? - ✔✔It stores some liquid refrigerant.
The heat added to a vapor causing it to become warmer is called: - ✔✔Superheat
The temperature of superheated refrigerant is - ✔✔above its boiling point
On a system that uses an accumulator what type of metering device is used? - ✔✔fixed orifice tube
Under normal operating conditions all of the following occurs inside the evaporator, EXCEPT: - ✔✔The
refrigerant changes from a vapor to a liquid.
What does the air conditioning compressor do to the system refrigerant? - ✔✔Increases its pressure
Technician A says air conditioning is the process of controlling the passenger compartment comfort level.
Technician B says the fluid that circulates through an air conditioning system is referred to generically as
refrigerant. Who is correct? - ✔✔Both A and B
During a routine fluid level inspection a radiator is found to be low on coolant. Technician A says that a
faulty radiator cap could be the cause. Technician B says that a cracked radiator to recovery tank hose
could be the cause. Who is correct? - ✔✔Both A and B
The Clean Air Act is being discussed. Technician A says the Montreal Protocol is one of the results of the
Clean Air Act. Technician B says it gave the EPA authority to control refrigerants in order to protect the
environment. Who is correct? - ✔✔Both A and B
After a vehicle has been driven for 10-15 miles, the heater still continues to blow cool air. Which of the
following is the most likely cause? - ✔✔Partially blocked heater core
How is heat transfer by convection accomplished? - ✔✔Heat travels through the surrounding air.
All of the following statements about the air conditioning circuit are true, EXCEPT: - ✔✔Heat transfer is
accomplished by two pressure and two temperature systems
Technician A says latent heat is hidden heat. Technician B says latent heat is required for a change of
state. Who is correct? - ✔✔Both A and B
Technician A says latent heat is hidden heat. Technician B says latent heat is required for a change of
state. Who is correct? - ✔✔Both A and B
Technician A says shop ventilation is not needed when working on new vehicles because new-vehicle
emissions are low. Technician B says the shop's ventilation system should be connected to the exhaust
pipe if the engine is running. Who is correct? - ✔✔Technician B only
All of the following conditions could cause poor passenger compartment heating system performance
EXCEPT - ✔✔Thermostat stuck in the closed position.
The metering device changes high-pressure liquid into a - ✔✔low-pressure liquid
,Technician A says the compressor is the dividing line of the refrigeration system, low- to high-side.
Technician B says the metering device is the dividing line of the refrigeration system, high- to low-side.
Who is correct? - ✔✔Both A and B
Technician A says that when working on a refrigerant system you should work in a well-ventilated area.
Technician B says to determine the type of refrigerant used in a system, a refrigerant identifier should be
used prior to servicing the vehicles refrigerant system. Who is correct? - ✔✔Both A and B
Technician A says you should always disconnect the power source while working on electric cooling fan
motors. Technician B says it is safe to work on electric cooling fan motors when the ignition switch is off.
Who is correct? - ✔✔Technician A only
All of the follow are true about engine thermostats EXCEPT: - ✔✔A thermostat should be removed from
a system if it is running hot
Where in the system is the receiver dryer located? - ✔✔on the outlet of the condenser.
Technician A says the air conditioning system is designed to remove heat from the passenger
compartment. Technician B says the air conditioning system is designed to transfer heat absorbed to the
outside air. Who is correct? - ✔✔Both A and B
Technician A says UV radiation inhibits the human body's immune system and causes skin tissue damage.
Technician B says the release of CFCs into the atmosphere could help increase the greenhouse effect.
Who is correct? - ✔✔Both A and B
Technician A says that serpentine belts made of EPDM resist cracking and instead exhibit wear to the
belt ribs similar to tire wear and that a depth gauge should be used to assess belt wear. Technician B says
that as a neoprene serpentine belt ages and wears that cracks will form on the belt ribs and that if there
are more than 3 cracks in a 3 inch span the belt should be replaced. Who is correct? - ✔✔Both A and B
Technician A says a defective radiator cap vacuum valve may cause hoses to collapse. Technician B says a
defective pressure valve may cause coolant boil over and loss. Who is correct? - ✔✔Both A and B
, The compressor changes a low-pressure vapor to - ✔✔a high-pressure vapor.
Hydrostatic pressure is being discussed. Technician A says the pressure in a tank will increase as the
liquid cools. Technician B says the containment system (tanks and lines) must withstand the changing
pressures created as the liquid changes states. Who is correct? - ✔✔Technician B only
Technician A says that the accumulator is on the high-pressure side of the refrigerant system. Technician
B says that the receiver-drier is attached to the evaporator outlet on the refrigerant system. Who is
correct? - ✔✔Neither A nor B
Performance testing on air conditioning is being discussed. Technician A says the engine should be
operated at speeds over 3,000 rpm during the test. Technician B says a fan should be used to force air
through the condenser and radiator. Who is correct? - ✔✔Technician B only
What affect does the receiver dryer have on the refrigerant? - ✔✔It stores some liquid refrigerant.
The heat added to a vapor causing it to become warmer is called: - ✔✔Superheat
The temperature of superheated refrigerant is - ✔✔above its boiling point
On a system that uses an accumulator what type of metering device is used? - ✔✔fixed orifice tube
Under normal operating conditions all of the following occurs inside the evaporator, EXCEPT: - ✔✔The
refrigerant changes from a vapor to a liquid.
What does the air conditioning compressor do to the system refrigerant? - ✔✔Increases its pressure
Technician A says air conditioning is the process of controlling the passenger compartment comfort level.
Technician B says the fluid that circulates through an air conditioning system is referred to generically as
refrigerant. Who is correct? - ✔✔Both A and B
