Midterm Review

______ type automotive air-conditioning systems use a receiver filter drier to ensure that a pure liquid refrigerant is delivered to the restriction.

• Fixed orifice tube

• Thermal expansion valve

• Low-pressure cycling

• High-pressure cycling

In the automotive air-conditioning system, the transformation from liquid to gas begins when the air from the passenger compartment passes over the coils and fins.

• Restriction

• Compressor

• Evaporator
• Condenser

______ currents from the heated air in the passenger compartment flow over an evaporator core of refrigerant, causing a conduction of heat through the metal coils of the evaporator.

• Radiation

• Conduction

• Convection

• Thermal

Fixed orifice tube automotive air-conditioning systems use a(n) to ensure that a pure gas is delivered to the compressor.

• Thermal expansion valve
• Evaporator

• Condenser

• Accumulator

Automotive air-conditioning is federally regulated by _______.

• The Environmental Protection Agency (EPA)

• The Department of Transportation (DOT)

• The National Highway Traffic Safety Administration (NHTSA)

• The Federal Trade Commission (FTC)

The function of air-conditioning in the HVAC system is to .

• Decrease overall aerodynamic efficiency

• Increase the fuel economy of the vehicle

• Reduce the temperature and humidity inside the passenger compartment to a level that ensures passenger comfort

• Increase the buildup of heat in the passenger compartment

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

• HFO-1234yf

• R-134a

• R-12
• R-410a

The older refrigerant systems that used typically used mineral oil as a lubricant.

• Carbon

• R-12
• R-134a

• R-410a

The acts as a low-pressure safety switch for the air-conditioning system.

• Accumulator

• Fixed orifice tube

• High-pressure cycling switch

• Low-pressure cycling switch

In a fixed orifice tube air-conditioning system, the low-pressure cycling switch is typically installed on the low-pressure line or on the:

• Accumulator.

• Compressor.

• Condenser.

• Receiver/drier.