Engineering Thermodynamics
For same compression ratio and for same heat added

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

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Engineering Thermodynamics
An isolated system is one in which

Mass does not cross boundaries of the system, though energy may do so
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system
Mass crosses the boundary but not the energy

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