HAC101 Air Conditioning Pre/Post Test

In 1939, Packard introduced the first automotive air-conditioning system as an add-on luxury unit.

• True

• False

The 609 license never expires.

• True

• False

________ is the process of transferring heat through matter by the movement of heat energy through solids from one particle to another.

• Convection

• Conduction

• Radiation

• Dictation

Tech A says that when an air-conditioning system freezes up, the refrigerant freezes and stops the cooling process. Tech B says that when an air-conditioning system freezes up, the evaporator coils are covered with frozen water molecules that stop airflow across the coils, thus preventing cooling. Who is correct?

Select one:

• Tech A

• Tech B

• Both A and B

• Neither A nor B

______ oil can sometimes be used with R-134a.

Select one:

• POE

• Mineral

• Ether

• Motor

Schrader valves are placed in the automotive air-conditioning ports and are designed to accept the ________ of the hose from the air-conditioning servicing equipment.

Select one:

• Low side

• High side

• Both A and B

• Neither A nor B

The receiver filter drier is constructed with a mesh and ________ media.

Select one:

• Paper filter

• Cloth filter

• Magnetic filter

• None of the answers listed

The low- pressure cycling switch will remain open until the pressure rises on the low side of the A/C system to around:

Select one:

• 26 psi.

• 36 psi.

• 46 psi.

• 56 psi.

Tech A says that the engine thermostat controls the flow of coolant through the heater system. Tech B says that the heater core can have engine coolant or refrigerant flowing through it, depending on whether heat or cool is commanded. Who is correct?

Select one:

• Tech A

• Tech B

• Both A and B

• Neither A nor B

________ are already taking the place of less-efficient belt-driven compressors.

• Pulse width compressors

• Chain-driven compressors

• Thermal compressors

• Electric compressors