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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at 30° after top dead center and ends at 50° after bottom dead center
May start and end anywhere
Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at top dead center and ends at bottom dead center

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Internal Combustion Engines
A hydraulic ram is a device used to

Increase the pressure of water
To lift water from deep wells
Store the energy of water
To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

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