Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at bottom dead centre and closes at top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
May open and close anywhere

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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

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

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Internal Combustion Engines
The exhaust valve in a four stroke cycle petrol engine

Opens at 50° after bottom dead center and closes at 15° before top dead center
Opens at 50° before bottom dead center and closes at 15° after top dead center
May open and close anywhere
Opens at bottom dead center and closes at top dead center

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Internal Combustion Engines