Internal Combustion Engines
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

Metacentre
Centre of gravity
Centre of pressure
Centre of buoyancy

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Internal Combustion Engines
For the same compression ratio

Compression ratio has nothing to do with efficiency
Both Otto and Diesel cycles are, equally efficient
Otto cycle is more efficient than the Diesel
Diesel cycle is more efficient than Otto

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