Exam 54: Heating and Air Conditioning

What is the main purpose of an accumulator?

High relative humidity is more comfortable than low humidity.

What is the function of the heating and ventilation system?

A malfunctioning engine thermostat can be the cause of poor heater performance.

Which of the following may be electrically connected in series with the compressor electromagnetic clutch?

The heater ____________________ is generally designed and constructed much like a miniature radiator.

Technician A says R-12 is a chlorofluorocarbon (CFC) that damages Earth's ozone layer. Technician B says R-134a is a hydrofluorocarbon (HFC) that causes even greater damage. Who is correct?

Airflow control valves in the ventilation duct work are operated by ______.

The boiling point of a liquid increases as ______.

Technician A repairs a leaking heater core. Technician B replaces it with a new core. Who is correct?

Which of the following components is NOT part of a receiver/drier?

All manufacturers recommend reverse flushing their heater cores.

The change from a vapor to a liquid is called ____________________.

A vehicle with insufficient heater performance is being discussed. Technician A says the problem could be a stuck-open engine thermostat. Technician B says air could be trapped inside the heater core. Who is correct?

The high pressure cutout switch disengages the compressor clutch when high-side pressure reaches _____ psi.

Technician A says when the pressure applied to a liquid is increased, the boiling point decreases. Technician B says when the pressure on a liquid is suddenly released, heat energy is absorbed into the liquid. Who is correct?

A liquid will boil at a lower temperature when it is put under pressure.

Variable displacement compressors are normally _____ compressors with a pivoting wobble plate.

Identify three common types of air-conditioning compressors.

Which of the following statements is not correct?