Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

(V₀/V₁)/ [1 + (V₀/V₁)²]
V₁/(V₀ + V₁)
[2(V₀/V₁)]/ [1 + (V₀/V₁)²]
V₀/(V₀ + V₁)

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

All of these
Nature of the fuel mixture strength
Relative velocity between the fuel injection and air turbulence pressure of residual gases
Temperature and pressure in the cylinder at the time of injection

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