Mean effective pressure of the Otto cycle is

Mean effective pressure of the Otto cycle is

Right Answer is:

Directly proportional to pressure ratio


Otto cycle: An ideal four-cycle gas engine consisting of two isentropic and two constant volume processes.

Mean effective pressure (MEP): Defined as the work output of a cycle divided by the volume swept out by the piston.


γ = Specific heat

r = compression ratio

rp = Pressure ratio

P = Pressure

In the case of  OTTO CYCLE, the work output is directly proportional to the pressure ratio.  The mean effective pressure which is an indication of the internal work output increases with an increase in pressure ratio. For an Otto cycle, an increase in the compression ratio leads to an increase in the mean effective pressure as well as the thermal efficiency.

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