Internal Combustion Engines
In a four stroke cycle engine, the sequence of operations is

Suction, compression, expansion and exhaust
Suction, expansion, compression and exhaust
Expansion, compression, suction and exhaust
Compression, expansion, suction and exhaust

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

May open or close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center
Opens at 20° before top dead center and closes at 40° after bottom dead center

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

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

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

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