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

Lower
None of the listed here
Higher
Remain unaffected

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

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

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

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

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

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