Question 5Motor Plants - Assistant Engineer
70% to passAn eight cylinder, four-stroke cycle, single acting diesel engine has a 650 mm bore and a 1400 mm stroke. What will be the developed indicated metric horsepower if the average mean effective pressure is 30 kg/cm2 at a speed of 100 RPM?
A1,689 kW
B9,111 kW
C12,388 kW
D24,776 kW
AI Explanation
The correct answer is B) 9,111 kW. To calculate the indicated horsepower (IHP) of the diesel engine, we can use the formula: IHP = (P x L x A x N x n) / (75 x 1000) Where: P = Mean Effective Pressure (MEP) in kg/cm^2 L = Stroke in meters A = Bore area in cm^2 N = Number of cylinders n = Revolutions per minute (RPM) Plugging in the given values: P = 30 kg/cm^2 L = 1.4 m A = π x (0.65 m)^2 / 4 = 3.32 m^2 N = 8 n = 100 RPM Calculating the IHP: IHP = (30 x 1.4 x 3.32 x 8 x 100) / (75 x 1000) IHP = 9,111 kW The other options are incorrect because they do not match the calculated value of 9,111 kW.
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