A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective pressure?

Correct Answer: Option A — 17.6 kg/cm2

Mean effective pressure is calculated by dividing the indicator diagram area by its length, then multiplying by the spring scale: (22 cm2 / 12.5 cm) x 10 kg/cm2 per cm yields 17.6 kg/cm2.