In Air-Standard cycle, which process from actual cycle is replaced by the process of restoring....

In Air-Standard cycle, which process from actual cycle is replaced by the process of restoring the working fluid to its initial state?

Options:

a. air intake process
b. fuel injection process
c. exhaust process
d. nothing is replaced

Correct Answer: c. exhaust process

Explanation:

Air-Standard cycle is an ideal cycle which is generally used for the elementary analysis of an I C Engine cycles. In the Air-Standard cycle no combustion takes place inside the cylinder. The combustion process is replaced by heat addition process from an external source as shown in figure below.



Air-Standard Cycle

No chemical process takes place inside the cylinder. A fixed amount of air which is considered as an ideal gas is used as working fluid. As the air-standard cycle is an ideal process, there must not be any heat losses or friction losses, so they should not be considered. Thus the combustion process, intake and exhaust processes are not considered in the air-standard cycle. The combustion process is replaced by heat addition and the exhaust process is replaced by heat rejection process at constant volume that mean the process of restoring the working fluid to its initial state.