Engineering Thermodynamics
The efficiency of Diesel cycle approaches to Otto cycle efficiency when

Cut-off is constant
Cut-off is decreased
Cut-off is increased
Cut-off is zero

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
All of these
All the processes, taking place in the cycle of operation, must be extremely slow
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

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