Understanding Refrigeration Systems

What role does the evaporator play in a refrigeration cycle?

• To absorb heat from the environment.

• To compress the refrigerant gas.

• To release heat into the surroundings.

• To filter impurities from the refrigerant.

Which component in the refrigeration cycle is responsible for absorbing heat?

• Expansion Valve

• Condenser

• Evaporator

• Compressor

In a refrigeration cycle, what happens to the refrigerant in the evaporator?

• The refrigerant absorbs heat and evaporates from liquid to gas.

• The refrigerant releases heat and condenses from gas to liquid.

• The refrigerant remains in a solid state throughout the process.

• The refrigerant cools down and freezes into ice.

What is the purpose of the condenser in the refrigeration cycle?

• To reject heat and turn refrigerant from gas to liquid.

• To absorb heat and vaporize refrigerant from liquid to gas.

• To circulate refrigerant throughout the system.

• To filter impurities from the refrigerant.

Which thermodynamic principle is primarily used in refrigeration systems?

• First law of thermodynamics

• Second law of thermodynamics

• Third law of thermodynamics

• Law of conservation of energy

What does the pressure-enthalpy diagram represent in refrigeration?

• It represents the thermodynamic processes of a refrigerant in refrigeration systems.

• It illustrates the cost of refrigeration systems.

• It depicts the environmental impact of refrigerants.

• It shows the temperature changes of a refrigerant.

How does increasing pressure affect the boiling point of a refrigerant?

• Increasing pressure makes the refrigerant boil instantly.

• Increasing pressure raises the boiling point of a refrigerant.

• Increasing pressure has no effect on the boiling point of a refrigerant.

• Increasing pressure lowers the boiling point of a refrigerant.

What is the role of the expansion valve in the refrigeration cycle?

• The expansion valve regulates refrigerant flow and reduces pressure, facilitating cooling in the refrigeration cycle.

• The expansion valve increases pressure to enhance cooling efficiency.

• The expansion valve is responsible for compressing the refrigerant before it enters the condenser.

• The expansion valve acts as a heat exchanger in the refrigeration cycle.

What is the significance of the critical point in a refrigerant's pressure-enthalpy diagram?

• The critical point is where the refrigerant becomes a solid.

• The critical point represents the maximum temperature of the refrigerant.

• The critical point indicates the optimal efficiency of the refrigerant.

• The critical point indicates the limit of phase separation between liquid and vapor for the refrigerant.

In the refrigeration cycle, what happens to the refrigerant during the compression process?

• The refrigerant is cooled, causing it to condense and lose pressure.

• The refrigerant remains at the same pressure and temperature throughout the process.

• The refrigerant is pressurised, increasing its pressure and temperature.

• The refrigerant evaporates, decreasing its pressure and temperature.