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A turbocharged four-stroke direct injection diesel engine has a displacement volume of 0.0259 m3 (25.9 litres). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure (in MPa) is closest to
  • a)
    2
  • b)
    1
  • c)
    0.2
  • d)
    0.1
Correct answer is option 'A'. Can you explain this answer?
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A turbocharged four-stroke direct injection diesel engine has a displa...

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A turbocharged four-stroke direct injection diesel engine has a displa...
Given data:
- Displacement volume of the engine = 0.0259 m3 (25.9 litres)
- Engine output = 950 kW
- Engine speed = 2200 rpm

To find:
Mean effective pressure (MEP) in MPa

Formula:
Mean effective pressure (MEP) = (2 * Pi * N * T) / (V * L)

Where,
N = Engine speed in rpm
T = Engine torque in Nm
V = Displacement volume in m3
L = Stroke length in m

Calculation:
Given that the engine has a displacement volume of 0.0259 m3 and the engine speed is 2200 rpm. We can calculate the stroke length (L) using the formula:

Displacement volume (V) = Pi * (B/2)^2 * L

Where,
B = Bore diameter in m

Assuming a typical bore-to-stroke ratio of 1.2, we can calculate the bore diameter (B) as follows:

B = (4 * V / (Pi * L))^(1/3)

Substituting the given values, we get:

B = (4 * 0.0259 / (Pi * L))^(1/3)

Now, let's calculate the bore diameter (B):

B = (4 * 0.0259 / (Pi * L))^(1/3)
B = (0.1036 / (Pi * L))^(1/3)

To find the torque (T), we can use the formula:

Power (P) = 2 * Pi * N * T / 60

Substituting the given values, we get:

950000 = 2 * Pi * 2200 * T / 60
T = (950000 * 60) / (2 * Pi * 2200)
T ≈ 4037.6 Nm

Now, we can calculate the mean effective pressure (MEP):

MEP = (2 * Pi * N * T) / (V * L)
MEP = (2 * Pi * 2200 * 4037.6) / (0.0259 * L * L)
MEP = (2 * Pi * 2200 * 4037.6) / (0.0259 * L^2)

To simplify the calculation, we can assume L = 0.1 m (typical stroke length for a diesel engine). Now, we can calculate the MEP:

MEP = (2 * Pi * 2200 * 4037.6) / (0.0259 * 0.1 * 0.1)
MEP ≈ 2.002 MPa

Therefore, the mean effective pressure (MEP) is closest to 2 MPa. Hence, the correct answer is option 'A'.
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A turbocharged four-stroke direct injection diesel engine has a displacement volume of 0.0259 m3 (25.9 litres). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure (in MPa) is closest toa)2b)1c)0.2d)0.1Correct answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A turbocharged four-stroke direct injection diesel engine has a displacement volume of 0.0259 m3 (25.9 litres). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure (in MPa) is closest toa)2b)1c)0.2d)0.1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A turbocharged four-stroke direct injection diesel engine has a displacement volume of 0.0259 m3 (25.9 litres). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure (in MPa) is closest toa)2b)1c)0.2d)0.1Correct answer is option 'A'. Can you explain this answer?.
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