Question 3Motor Plants - Assistant Engineer70% to pass
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?
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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