Internal Combustion Engines
For the same compression ratio

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

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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

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

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