Question 5Motor Plants - Assistant Engineer70% to pass
An 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?
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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