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An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at intake is 1 kg/m3, the indicated mean effective pressure for the engine is
  • a)
    6.075 bar
  • b)
    6.75 bar
  • c)
    67.5 bar
  • d)
    243 bar
Correct answer is option 'A'. Can you explain this answer?
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An automobile engine operates at a fuel air ratio of 0.05, volumetric ...

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An automobile engine operates at a fuel air ratio of 0.05, volumetric ...
Given data:
- Fuel air ratio (λ) = 0.05
- Volumetric efficiency (ηv) = 90%
- Indicated thermal efficiency (ηth) = 30%
- Calorific value of the fuel (CV) = 45 MJ/kg
- Density of air at intake (ρair) = 1 kg/m3

Formula:
Indicated mean effective pressure (IMEP) = (ηth * CV * λ) / (ρair * ηv)

Calculation:
Substituting the given values into the formula:

IMEP = (0.30 * 45 * 0.05) / (1 * 0.90)
= 0.675 bar

Rounding off to the nearest hundredth, the indicated mean effective pressure (IMEP) is approximately 0.68 bar.

Therefore, the correct answer is option 'A' - 0.68 bar.
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An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at intake is 1 kg/m3, the indicated mean effective pressure for the engine isa)6.075 barb)6.75 barc)67.5 bard)243 barCorrect answer is option 'A'. Can you explain this answer?
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An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at intake is 1 kg/m3, the indicated mean effective pressure for the engine isa)6.075 barb)6.75 barc)67.5 bard)243 barCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at intake is 1 kg/m3, the indicated mean effective pressure for the engine isa)6.075 barb)6.75 barc)67.5 bard)243 barCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at intake is 1 kg/m3, the indicated mean effective pressure for the engine isa)6.075 barb)6.75 barc)67.5 bard)243 barCorrect answer is option 'A'. Can you explain this answer?.
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