Question 3Motor Plants - Assistant Engineer
70% to passA 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?
A17.6 kg/cm2
B27.5 kg/cm2
C34.5 kg/cm2
D36.0 kg/cm2
AI Explanation
The correct answer is A) 17.6 kg/cm2. To calculate the cylinder mean effective pressure (CMEP), we can use the formula: CMEP = (Indicator diagram area) / (Indicator diagram length) x (Scale of the indicator spring). Given information: - Indicator diagram area = 22 cm2 - Indicator diagram length = 12.5 cm - Scale of the indicator spring = 1 mm = 1 kg/cm2 Plugging in the values: CMEP = (22 cm2) / (12.5 cm) x (1 kg/cm2) CMEP = 1.76 kg/cm2 Therefore, the cylinder mean effective pressure is 17.6 kg/cm2, which is the correct answer. The other options are incorrect because they do not match the calculated value of 17.6 kg/cm2.
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