81) The theoretically correct air fuel ratio for petrol engine is of the order of

82) Air fuel ratio for idling speed of a petrol engine is approximately

83) Air fuel ratio at which a petrol engine can not work is

84) For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

85) The following volume of air is required for consuming 1 liter of fuel by a four stroke engine