Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

Exhaust valve opens just after bottom dead center and closes just before top dead center
May open and close anywhere
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens at bottom dead center and closes at top dead center

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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

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

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MORE MCQ ON Internal Combustion Engines