Unit 12 - HVAC

Which component of the refrigeration system cools the space by absorbing heat from its surroundings?

• Compressor

• Evaporator

• Expansion device

• Condenser

Which of the following pressure and temperature changes occur as refrigerant passes through the expansion device?

• Both pressure and temperature increase

• Pressure increases and temperature decreases

• Pressure decreases and temperature increases

• Both pressure and temperature decrease

Which of the following best describes the refrigerant as it moves through the metering device?

• It enters the device as a superheated gas and leaves the device as a mixture of liquid and vapor

• It enters the device as a saturated mixture and leaves the device as a superheated gas

• It enters the device as a saturated mixture and leaves the device as a subcooled liquid

• It enters the device as a subcooled liquid and leaves the device as a mixture of liquid and vapor

At what point in the refrigeration cycle does the refrigerant change from a superheated vapor to a saturated mixture?

• Leaving the evaporator

• Center of the condenser

• End of the condenser

• Center of the evaporator

Which of the following best describes the pressure, temperature, and state of the refrigerant as it enters the condenser?

• Pressure and temperature are low and it is a vapor

• Pressure and temperature are high and it is a vapor

• Pressure and temperature are high and it is a saturated mix

• Pressure and temperature are low and it is a saturated mix

Which of the following best describes the change in refrigerant from when it enters the evaporator to when it exits the evaporator?

• It enters as a subcooled liquid and exits as a saturated mixture

• It enters as a superheated vapor and exits as a saturated mixture

• It enters as a saturated mixture and exits as a subcooled liquid

• It enters as a saturated mixture and exits as a superheated vapor

Which two components of a refrigeration system are connected by the discharge line?

• Metering device and evaporator

• Compressor and condenser

• Evaporator and compressor

• Condenser and metering device

Which component of the refrigeration unit is attached to the discharge line and the suction line?

• Evaporator

• Condenser

• Compressor

• Metering device

What happens to vapor that is collected in a liquid receiver?

• It remains in the liquid receiver as a vapor

• It combines with the liquid to make a saturated mixture

• It condenses into a liquid in the liquid receiver

• It is allowed to flow back into the condenser

Where does liquid refrigerant that has been stored in a liquid receiver enter the refrigeration system when it is needed?

• The metering device

• The liquid line

• The compressor

• The discharge line