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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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