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<p><strong>A two constant pressure processes and two constant volume processes B two constant pressure and two constant entropy processes C two constant volume processes and two constant entropy processes D none of the above</strong></p>
Option A
2 constant pressure processes and two constant volume processes
The air-standard-Otto cycle is the idealized cycle for the spark-ignition internal combustion ...
This below would let me believe D to be the right answer.
As this an isotropic process, entropy remains constant (i.e., s1=s2).
The Otto Cycle is more commonly known as the4 stroke cycle and is comprised of four functions which take place in a sequential order within the cylinder: Intake, Compression, Combustion, Exhaust. Or for us simple people it's Suck, squeeze, bang, blow. Pressure never remains constant nor does volume.
Process1-2: Reversible adiabatic compression of air.
Process2-3: Heat addition at constant volume.
Process3-4: Reversible adiabatic expansion of air.
Process4-1: Heat rejection at constant volume.
Good analysis to the answers by Elke.
Pressure never remains constant nor does volume.
D none of the above
I believe the answer is choice "A"
