HVAC Basics

What separates the high and low pressure sides in a refrigeration system?

• Indoor and outdoor coils

• Filter dryer and surface valve

• Condenser and evaporator

• Compressor and metering device

What is the primary function of the compressor in a refrigeration cycle?

• To decrease the pressure of the refrigerant

• To increase the temperature of the refrigerant by increasing its pressure

• To absorb heat from the indoor air

• To filter out water vapor from the refrigerant

What does the metering device do to the refrigerant?

• Removes moisture from it

• Converts it into a gas

• Lowers its pressure to decrease temperature

• Increases its temperature

What state is the refrigerant in when it enters the compressor?

• High pressure high temperature vapor

• High pressure liquid

• Low pressure liquid

• Low pressure low temperature vapor

What is the main purpose of the refrigeration cycle?

• To increase the pressure of the refrigerant

• To move heat from the indoor coil to the outdoor coil

• To cool the motor inside the compressor

• To filter out impurities from the refrigerant

What happens to the refrigerant in the condenser coil?

• It rejects heat and becomes a high pressure high temperature liquid

• Both B and C are correct

• It changes from a vapor to a liquid state

• It absorbs heat from the outdoor air

What is the role of the filter dryer in the refrigeration system?

• To decrease the refrigerant pressure

• To cool the refrigerant

• To absorb water vapor from the system

• To increase the refrigerant pressure

What is the condition of the refrigerant as it enters the metering device?

• Low pressure low temperature vapor

• High pressure high temperature subcooled liquid

• Saturated vapor and liquid mix

• High pressure vapor only

What is the significance of the refrigerant being 'saturated'?

• It is fully in a liquid state

• It is fully in a vapor state

• It has absorbed maximum heat

• It is at its boiling point and both liquid and vapor exist simultaneously

Why is it important that only vapor refrigerant enters the compressor?

• To prevent damage to the compressor

• To increase the efficiency of heat absorption

• To maintain high pressure in the system

• To ensure the refrigerant is cooled properly