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Consider the following statements : 1. The air standard efficiency of an Otto cycle is a function of the properties of the working substance (gas) 2. For the same compression ratio and same input, the thermal efficiency of an Otto cycle is more than that of a Diesel cycle 3. The thermal efficiency of a Diesel cycle increases with decrease of cut-off ratio Which of the above statements are correct? (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3 |
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Answer» (d) 1, 2 and 3 \(\eta\)Otto = 1 - \(\cfrac{1}{r^{\gamma - 1}}\) i.e \(\eta\)Otto = f(r1\(\gamma\)) Here r is not property of working substance. Lower cut-off ratio leads to better efficiency. |
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