Internal Combustion Engines
The knocking tendency in spark ignition engines may be decreased by

Reducing the compression ratio
Controlling the ignition timing
Controlling the air-fuel mixture
Controlling the exhaust temperature

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Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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