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.