Internal Combustion Engines
In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a

None of these
Fuel pump
Spark plug
Fuel injector

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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Directly proportional to its (distance)2 from the centre
Inversely proportional to its distance from the centre
Directly proportional to its distance from the centre
Inversely proportional to its (distance)2 from the centre

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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

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

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