Question 23Motor Plants - Assistant Engineer

The correct answer is A. The indicator diagram that depicts the condition that should be corrected by retarding only the timing is option A. This is because the indicator diagram in option A shows a late closing of the exhaust valve, which can be corrected by retarding the timing of the engine. Retarding the timing will cause the exhaust valve to close later, bringing the indicator diagram closer to the ideal. The other options (B, C, and D) show different engine conditions that would require other adjustments, such as changes to the fuel system or compression, and cannot be corrected by retarding the timing alone.