Internal Combustion Engines
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be

None of the listed here
Remain unaffected
Higher
Lower

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Internal Combustion Engines
Compression ratio of I.C. Engines is

The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Ratio of pressure after compression and before compression
Volume displaced by piston per stroke and clearance volume in cylinder
Swept volume/cylinder volume

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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

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

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