ACS questions and answers
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
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
