4. Otto cycle in four-stroke spark-ignition engine

A. Explain the processes in a gasoline engine by treating it as a basic four-

stroke spark-ignition engine. In each stroke, fill the empty cells of the following table:

the status of inlet and outlet valves (i.e., either open or closed), energy transfer (i.e.,

stating a form of energy A is converted to another form of energy B), and mass transfer.

B. Assume that in the expansion stroke, the piston moves with a speed of 10

m/s. The velocity of sound is 340 m/s, and the length of the cylinder is 9 cm. Can the

expansion stroke be considered as a quasi-equilibrium process? Explain your

reasoning. (Combustion is completed within a very short time, and we consider the

expansion process after combustion.)