An Otto cycle with air as the working fluid has a compression ratio of 8.2. The ambient temperature is 298K. The maximum temperature of the Otto cycle is 2000K. Under cold air standard conditions, the thermal efficiency of this cycle is

The correct answer is "57%".

Explanation:

Given:

Temperature:

Compression ratio (r),

=

For Otto cycle, the thermal efficiency will be:

⇒

By substituting the values, we get

        (%)  

answer:

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