Internal Combustion Engines
Which of the following statement is correct regarding petrol engines?

A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
All of these
The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug

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

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

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Internal Combustion Engines
Volatility of diesel fuel oil is

Temperature at which it solidifies or congeals
Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
It catches fire without external aid

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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/V₁)/ [1 + (V₀/V₁)²]
V₀/(V₀ + V₁)

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