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

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Internal Combustion Engines
The purpose of testing an internal combustion engine is

All of these
To conform the data used in design, the validity of which may be doubtful
To satisfy the customer regarding the performance of the engine
To determine the information, which cannot be obtained by calculations

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve closing before bottom dead center
Inlet valve closing after bottom dead center
Exhaust valve closing after top dead center
Inlet valve opening before top dead center

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