Mechanical Engineering Exam > Mechanical Engineering Questions > An inventor says, he has invented an engine w...
Start Learning for Free
An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?
- a)Carnot engine
- b)Diesel engine
- c)Dual engine
- d)Impossible engine
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
An inventor says, he has invented an engine which will reject 20% of h...
T1 = 2000 K
T2 = 500 K
Since, the actual efficiency is more than the Carnot efficiency, so this engine has an impossible cycle.
Most Upvoted Answer
An inventor says, he has invented an engine which will reject 20% of h...
**Explanation:**
To determine the type of engine, we need to consider the efficiency of the engine. The efficiency of an engine is defined as the ratio of the useful work output to the heat absorbed from the source.
Efficiency = (Useful work output) / (Heat absorbed from the source)
For a Carnot engine, the efficiency is given by the Carnot efficiency formula:
Efficiency = 1 - (Tc/Th)
where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.
In this case, the engine operates between 2000 K and 500 K. Plugging these values into the Carnot efficiency formula:
Efficiency = 1 - (500/2000) = 1 - 0.25 = 0.75 = 75%
However, the inventor claims that the engine will reject 20% of the heat absorbed from the source. This means that only 80% of the heat absorbed is used for useful work output. Therefore, the efficiency of the engine would be:
Efficiency = 0.8 * 0.75 = 0.6 = 60%
As we can see, the efficiency of the engine (60%) is less than the maximum efficiency of a Carnot engine (75%). This violates the second law of thermodynamics, which states that no engine can be more efficient than a Carnot engine operating between the same two temperatures.
Therefore, the claim made by the inventor is not possible and the correct answer is option 'D' - Impossible engine.
To determine the type of engine, we need to consider the efficiency of the engine. The efficiency of an engine is defined as the ratio of the useful work output to the heat absorbed from the source.
Efficiency = (Useful work output) / (Heat absorbed from the source)
For a Carnot engine, the efficiency is given by the Carnot efficiency formula:
Efficiency = 1 - (Tc/Th)
where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.
In this case, the engine operates between 2000 K and 500 K. Plugging these values into the Carnot efficiency formula:
Efficiency = 1 - (500/2000) = 1 - 0.25 = 0.75 = 75%
However, the inventor claims that the engine will reject 20% of the heat absorbed from the source. This means that only 80% of the heat absorbed is used for useful work output. Therefore, the efficiency of the engine would be:
Efficiency = 0.8 * 0.75 = 0.6 = 60%
As we can see, the efficiency of the engine (60%) is less than the maximum efficiency of a Carnot engine (75%). This violates the second law of thermodynamics, which states that no engine can be more efficient than a Carnot engine operating between the same two temperatures.
Therefore, the claim made by the inventor is not possible and the correct answer is option 'D' - Impossible engine.
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
|
|
Similar Mechanical Engineering Doubts
Top Courses for Mechanical EngineeringView all
An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer?
Question Description
An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. 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 inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. 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 inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer?.
An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. 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 inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. 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 inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer?.
Solutions for An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. 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 inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice An inventor says, he has invented an engine which will reject 20% of heat absorbed from the source and the engine operates between 2000 K and 500 K. What kind of engine it is?a)Carnot engineb)Diesel enginec)Dual engined)Impossible engineCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup