Semi Quiz 3

What does the slope of an isentropic process on the Mollier diagram represent?

• Constant pressure

• Constant temperature

• No change in entropy

Why is the enthalpy value important in refrigeration cycle calculations?

• It helps determine refrigerant mass flow rate

• It shows the energy change between different stages

• It calculates the physical size of the system

• It is used to measure compressor efficiency directly

What does a horizontal movement in the Mollier diagram indicate?

• A constant enthalpy process

• A change in entropy

• An increase in temperature

• Work done on the refrigerant

Why does the enthalpy of refrigerant increase in the evaporator?

• The refrigerant absorbs heat from the surroundings

• The compressor adds work energy

• The condenser removes heat

• The refrigerant undergoes an expansion process

If a refrigeration system has an evaporator inlet enthalpy of 120 kJ/kg and an outlet enthalpy of 160 kJ/kg, how much heat is absorbed by the evaporator?

• 120 kJ/kg

• 160 kJ/kg

• 40 kJ/kg

• 280 kJ/kg