Internal Combustion Engines
A diesel engine as compared to petrol engine (both running and rated load) is

More efficient
Less efficient
Other factors will decide it
Equally efficient

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Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging reduces knocking in diesel engines
Supercharging at high altitudes is essential
Supercharging results in fuel economy
There can be limited supercharging in petrol engines because of detonation

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