Comparing the Otto and Diesel cycles on the P-v diagram for the SAME compression ratio and same heat input, which cycle has the higher peak temperature and higher thermal efficiency?
Options:
(A) Otto cycle has both higher peak temperature and higher efficiency
(B) Diesel cycle has higher peak temperature and higher efficiency
(C) Otto cycle has higher efficiency, but Diesel cycle has higher peak temperature
(D) Both have identical efficiency and peak temperature
Answer Key:
A
Step-by-Step Solution & Explanation
For the same compression ratio and heat input, heat addition in the Otto cycle occurs at constant volume, leading to higher peak temperature and pressure, and higher thermal efficiency than the constant-pressure heat addition of the Diesel cycle.