Question

The correct way of representing the compression ratio is __________

(a) C.R.=\(\frac{Total \, cylinder \, volume}{Clearance \, Volume} \)

(b) C.R.=\(\frac{Clearance \, Volume}{Total \, Clearance \, Volume} \)

(c) C.R.=\(\frac{Total \, clearance \, volume}{Cylinder \, Volume} \)

(d) C.R.=\(\frac{Clearance \, volume}{Total \, cylinder \, volume} \)

The question was asked by my college professor while I was bunking the class.

My question is based upon Diesel Engine Vs. Petrol Engine in section Internal Combustion Engine of Farm Machinery

Answer 1

Correct answer is (a) C.R.=\(\frac{Total \, cylinder \, volume}{Clearance \, Volume} \)

The best explanation: Compression ratio is the ratio of the volume of the charge at the beginning of the compression stroke to that at the end of the compression stroke, i.e., ratio of total cylinder to clearance volume or \(\frac{Swept \, volume+Clearance \, volume}{Clearance \, Volume}.\)