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The efficiency of Diesel cycle approaches to Otto cycle efficiency when
Answer & Solution
Correct Answer:
Option
D
In the Diesel cycle, the efficiency approaches the efficiency of the Otto cycle when the cut-off is zero.
The Diesel cycle consists of constant pressure heat addition followed by constant volume heat rejection. When the cut-off ratio is zero, the heat addition process in the Diesel cycle becomes constant volume (isochoric) instead of constant pressure. This is analogous to the heat addition process in the Otto cycle, where heat is added at constant volume.
As a result, when the cut-off ratio is zero in the Diesel cycle, its thermal efficiency approaches that of the Otto cycle, which is higher due to the constant volume heat addition process. Therefore, the correct option is Option D: Cut-off is zero.
The Diesel cycle consists of constant pressure heat addition followed by constant volume heat rejection. When the cut-off ratio is zero, the heat addition process in the Diesel cycle becomes constant volume (isochoric) instead of constant pressure. This is analogous to the heat addition process in the Otto cycle, where heat is added at constant volume.
As a result, when the cut-off ratio is zero in the Diesel cycle, its thermal efficiency approaches that of the Otto cycle, which is higher due to the constant volume heat addition process. Therefore, the correct option is Option D: Cut-off is zero.
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LoginBecause here (Cut-off) is mention so, when cut-off will be zero then the efficiency of diesel cycle approaches to the efficiency of otto.
Where CUT-OFF and CUT-OFF RATIO both are different, If cut-off ratio is unity then the efficiency of the diesel cycle will approach to efficiency of otto cycle.