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

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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel in a chamber of high pressure at the end of compression stroke
All of these
Ensure that penetration is not high
Inject fuel at a high velocity to facilitate atomization

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