Answer: Flexible duct because, They also developed more than 1,000 safety criteria, some of which are... labelled goods bearing a silver UL sticker on the duct that defines this listing. ... lie in the research carried out by UL and, as a result, the authorized use of the code. Air Ducts are required to perform 15 separate tests.
Source: https://dundasjafine.com/ul-classification/
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Answer:
Cut-off ratio
Cxpansion ratio
The exhaust temperature
Explanation:
Compression ratio CR(r)=20



We know that for air γ=1.4
If we assume that in diesel engine all process is adiabatic then





So cut-off ratio

Now putting the values in above equation


So expansion ratio
.



So the exhaust temperature