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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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel at a high velocity to facilitate atomization
All of these
Ensure that penetration is not high
Inject fuel in a chamber of high pressure at the end of compression stroke

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