Answer:
η=0.568
Step-by-step explanation:
At inlet condition
temperature = 30 C and pressure P=1 bar
The maximum temperature = 13456 C
Compression ratio r= 12
We know that for process 1-2



Now for process 2-3



So the cut off ratio ρ=1.97
Efficiency of diesel engine

Now put the values

⇒η=0.568
So the efficiency is 56.8%.