Automotive Air-Conditioning Midterm

The Clean Air Act (CAA) ________.

• Mandates that each shop maintain a current government-issued license

• Outlines the specific refrigerants that can be safely used for each application

• Sets the standards for shops that do air-conditioning work

• All of the above

The 609 license ensures that the technician knows how to repair the automotive air-conditioning systems.

• True

• False

The _________ of the refrigerant system is designed to allow easy transformation of the refrigerant from a liquid to a gas.

• High side

• Low side

• Medium side

• None of the above

The amount of heat required to raise the temperature of 1 pound of water at 32°F (0°C) and at atmospheric pressure by 1°F would be:

• 1 kelvin.

• 1 Btu.

• 1 joule.

• 1 rankine.

When the pressure of a gas is raised, its temperature:

• goes down.

• remains unchanged.

• goes up.

• becomes unstable.

The A/C compressor clutch is engaged and disengaged by using:

• hydraulic pressure.

• vacuum.

• compressed air.

• electromagnetism.

The A/C condenser is normally positioned:

• in front of the radiator.

• behind the radiator.

• in the cabin air box.

• on the firewall.

______, a member of the CFC family of gases, was the first common refrigerant to be used in an automotive air-conditioner.

• HFO-1234yf

• Tetrafluoroethan (R-134a)

• Dichlorodifluoromethane (R-12)

• Pentafluoroethane (R-410a)

Fixed orifice tube automotive air-conditioning systems do not use a(n) _____ to ensure that a pure gas is delivered to the compressor.

• Thermal expansion valve

• Evaporator

• Condenser

• Accumulator

When the compressor switches on, the suction from the compressor removes refrigerant vapor from the evaporator and _____ its pressure.

• Lowers

• Raises

• Varies

• None of the answers listed