Understanding Vapor-Compression Refrigeration

What is the primary function of the compressor in the vapor-compression refrigeration cycle?

• To cool the refrigerant

• To compress the refrigerant, increasing its pressure and temperature

• To expand the refrigerant

• To condense the refrigerant

What happens to the refrigerant in the condenser?

• It is compressed

• It is expanded

• It is de-superheated and condensed into a liquid

• It is evaporated

What is the state of the refrigerant as it enters the compressor?

• High-pressure, high-temperature vapor

• Low-pressure, low-temperature liquid

• Low-pressure, low-temperature superheated vapor

• High-pressure, high-temperature liquid

What is the purpose of subcooling the liquid refrigerant before it leaves the condenser?

• To increase its pressure

• To reduce its temperature below the saturation temperature

• To convert it into a vapor

• To increase its temperature

What happens to the refrigerant as it passes through the metering or expansion device?

• Its pressure is increased

• Its pressure is reduced, causing some of it to flash to a vapor

• It is condensed into a liquid

• It is heated

What is the effect of the pressure reduction in the metering device on the refrigerant's temperature?

• The temperature increases

• The temperature remains constant

• The temperature decreases to its saturation temperature

• The temperature becomes zero

In which component of the vapor-compression refrigeration cycle does the refrigerant become a low-pressure, low-temperature liquid?

• Compressor

• Condenser

• Evaporator

• Expansion device

What is the state of the refrigerant as it enters the evaporator?

• High-pressure, high-temperature vapor

• Low-pressure, low-temperature liquid

• High-pressure, high-temperature liquid

• Low-pressure, low-temperature vapor

Which component is considered the "heart" of the vapor-compression refrigeration cycle?

• Condenser

• Evaporator

• Compressor

• Expansion device

What is the term used for the vapor that forms when the refrigerant pressure is reduced in the expansion device?

• Superheated vapor

• Flash-gas

• Subcooled liquid

• Saturated vapor