Practice question

In an engine specific fuel consumption map (Muscheldiagramm / shell curve), where is the point of optimum fuel efficiency located?

  1. In the innermost 'shell' at medium-to-high engine load (70%–85% torque) and low-to-medium engine speed (1,000–1,300 RPM), representing the lowest specific consumption in g/kWh
  2. At maximum engine RPM with zero load
  3. At minimum engine idle RPM with full throttle
  4. At maximum rated engine power at 2,400 RPM

Answer: A — In the innermost 'shell' at medium-to-high engine load (70%–85% torque) and low-to-medium engine speed (1,000–1,300 RPM), representing the lowest specific consumption in g/kWh

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