Nozzle efficiency — definition by heat drops Definition prompt: The ratio of the useful heat drop (actual enthalpy drop converted to kinetic energy) to the isentropic heat drop across a nozzle equals which efficiency? Choose the correct option.

Concept/Approach

• Nozzle efficiency is defined as η_n = (actual KE at exit)/(ideal KE) = (actual enthalpy drop)/(isentropic enthalpy drop).
• It measures how effectively the available heat drop is converted to kinetic energy.

Final AnswerNozzle efficiency