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What is the percentage at which rated power from biogas in petrol engine can be developed?

What is the percentage at which rated power from biogas in petrol engine can be developed? Correct Answer 85%

Petrol engine can be operated on biogas after initially starting with petrol. Petrol replacement of 1005 is possible and petrol engines can develop about 85% of rated power where as diesel engine can develop full power.

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