Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is

2V₀ / (V₀ + V₁)
V₀ / (V₀ + V₁)
V₁ / (V₀ + V₁)
2V₁ / (V₀ + V₁)

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Internal Combustion Engines
For the same compression ratio

Otto cycle is more efficient than the Diesel
Both Otto and Diesel cycles are, equally efficient
Compression ratio has nothing to do with efficiency
Diesel cycle is more efficient than Otto

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