Automotive AC

The boiling point of R-134a is _____________.

• 16 ^degrees  Fahrenheit
• -16^degrees  Celcius
• -16^degrees  Fahrenheit
• 27^degrees   Celcius

____________ is the measurement of how hot or cold something feels.

• BTU
• freezing
• temperature
• comfort

The air conditioning compressor _____________ vaporized refrigerant and allows it to flow to the condenser. 

• pressurizes
• cools
• supplies
• cleans

Adding pressure to a liquid _______ its boiling point. Adding pressure to a vapor _______ its temperature. 

• raises, raises
• lowers, lowers
• raises, lowers
• lowers, raises

In the evaporator, refrigerant is under very low pressure and is much colder than the air inside of the vehicle. Because of this, heat transfers from the ________ to the _______, causing the refrigerant to _______. 

• refrigerant, vehicle, vaporize
• vehicle, refrigerant, condense
• vehicle, refrigerant, vaporize
• refrigerant, vehicle, condense

CAUTION!  High-pressure tubing near the compressor is extremely ________.

• expensive
• HOT
• fragile
• rare

The Compressor discharge hose uses a _____________ diameter than the suction hose.

• larger
• smaller
• identical
• opposite

The air conditioning compressor acts as the ________ of the system, keeping refrigerant circulating during air conditioning system operation.

• Top
• Bottom
• Pump
• brain

R-134a A/C systems use a different refrigerant oil than older vehicles with R-12 systems.  This is known as ______ oil.

• dye
• castor
• PAG
• Ester

Where is the TXV installed in the refrigeration system? 

• At the condenser inlet and outlet tubes
• Between the evaporator outlet and the compressor inlet
• At the evaporator inlet and outlet fittings
• Between the evaporator outlet and condenser inlet