Automobile Engineering in ME
A battery can be charged by

Adding sulphuric acid
Applying a voltage in the same direction to that of charging
Adding distilled water
Applying voltage in the reverse direction to that of charging

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

It makes petrol engines lighter
It is just customary to have less compression ratio in petrol engines
Less compression ratio gives better performance
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

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