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

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Internal Combustion Engines
The purpose of testing an internal combustion engine is

To determine the information, which cannot be obtained by calculations
All of these
To satisfy the customer regarding the performance of the engine
To conform the data used in design, the validity of which may be doubtful

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