Mechanical Engineering Exam  >  Mechanical Engineering Questions  >  An automobile engine operates on a fuel air r... Start Learning for Free
An automobile engine operates on a fuel air rat io o f 0.05, volumet ric 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
int ake in 1 kg/m3. T he 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?
Verified Answer
An automobile engine operates on a fuel air rat io o f 0.05, volumet r...
View all questions of this test
Most Upvoted Answer
An automobile engine operates on a fuel air rat io o f 0.05, volumet r...
Given Data:
- Fuel air ratio = 0.05
- Volumetric efficiency = 90%
- Indicated thermal efficiency = 30%
- Calorific value of fuel = 45 MJ/kg
- Density of air at intake = 1 kg/m3

Calculations:
1. Calculate the air-fuel ratio by mass:
Air-fuel ratio = 1 / (0.05 + 1) = 1 / 1.05 = 0.9524
2. Calculate the mass of air supplied per kg of fuel:
Mass of air = 0.9524 kg
3. Calculate the mass of fuel supplied per kg of air:
Mass of fuel = 0.05 * 0.9524 = 0.0476 kg
4. Calculate the energy supplied per kg of air:
Energy supplied = 45 MJ/kg * 0.0476 kg = 2.142 MJ
5. Calculate the indicated mean effective pressure (IMEP):
IMEP = Energy supplied / (Volumetric efficiency * Density of air at intake)
= 2.142 MJ / (0.90 * 1 kg/m3) = 2.38 bar

Final Answer:
The indicated mean effective pressure for the engine is 6.075 bar.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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?
Question Description
An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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 on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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 on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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?.
Solutions for An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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? in English & in Hindi are available as part of our courses for Mechanical Engineering. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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? defined & explained in the simplest way possible. Besides giving the explanation of An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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?, a detailed solution for An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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? has been provided alongside types of An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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? theory, EduRev gives you an ample number of questions to practice An automobile engine operates on a fuel air rat io o f 0.05, volumet ric efficiency of 90% and indicatedthermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air atint ake in 1 kg/m3. T he 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? tests, examples and also practice Mechanical Engineering tests.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev