Engineering Thermodynamics
For same compression ratio and for same heat added

Diesel cycle is more efficient than Otto cycle
Efficiency depends on other factors
Otto cycle is more efficient than Diesel cycle
Both Otto and Diesel cycles are equally efficient

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Engineering Thermodynamics
The mass of flue gas per kg of fuel is the ratio of the

Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas
Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas
Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel
Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel

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