Question

For the same maximum pressure and same heat input in the air standard cycles, which of the following option is CORRECT?

• A. Diesel cycle is less efficient than Otto cycle
• B. Otto cycle is less efficient than Diesel cycle
• C. Otto and Diesel cycles have equal efficiency
• D. Carnot cycle is less efficient than Otto cycle

Hint:

The efficiency of a cycle increases with the compression ratio. Diesel engines typically have higher compression ratios than Otto engines, which leads to greater efficiency.

Answer 1

The Correct Option is B

For the same maximum pressure and heat input, the Diesel cycle is more efficient than the Otto cycle due to its higher compression ratio. The Otto cycle has a lower compression ratio, leading to a lower efficiency compared to the Diesel cycle under similar conditions.