Mechanical Engineering - Thermodynamics - Discussion

Discussion Forum : Thermodynamics - Section 2 (Q.No. 36)
36.
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
combustion is at constant volume
expansion and compression are isentropic
maximum temperature is higher
heat rejection is lower
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
14 comments Page 2 of 2.

Prince said:   9 years ago
I think the answer should be C because max temperature is higher in otto cycle than the Diesel cycle keeping the compression ratio same and also we could not say anything about temperature if we, please comment to know about it.

Mayank said:   9 years ago
Yes, I agree with you @Navaneeth.

Navaneeth said:   1 decade ago
According to question Otto cycle is efficient, but practically diesel has more comparison ratio, so it has more efficiency.

Love said:   1 decade ago
Since rejection of heat takes place at lower temperatures, comparing its equation with carnot cycle, the efficiency is more as in diesel engines rejection of heat takes place at higher temp. than otto cycle.


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