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Brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles are given in the increasing order as
- a)2 stroke SI engine, 4 stroke SI engine, 4 stroke Cl engine
- b)2 stroke SI engine, 4 stroke Cl engine, 4 stroke SI engine
- c)4 stroke SI engine, 2 stroke SI engine, 4 stroke Cl engine
- d)4 stroke Cl engine, 4 stroke SI engine, 2 stroke SI engine
Correct answer is option 'A'. Can you explain this answer?
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Brake thermal efficiency of the three types of reciprocating engines c...
Due to scavenging in two-stroke engine brake thermal efficiency of two-stroke engine is less. In Cl engine very high fuel-air. ratio is used as compared to SI engine hence thermal efficiency of Cl engine will be more than SI engine and also in Cl engine higher compressor ratios are used.
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Brake thermal efficiency of the three types of reciprocating engines c...
Brake thermal efficiency of reciprocating engines:
Brake thermal efficiency is defined as the ratio of brake power output to the energy input from the fuel. It is expressed in percentage.
The three types of reciprocating engines commonly used in road vehicles are:
1. 2 stroke SI engine
2. 4 stroke SI engine
3. 4 stroke Cl engine
The increasing order of brake thermal efficiency of these engines is given as:
2 stroke SI engine < 4="" stroke="" si="" engine="" />< 4="" stroke="" cl="" />
Explanation:
1. 2 stroke SI engine:
- It has lower brake thermal efficiency compared to other engines due to the loss of unburnt fuel and incomplete combustion.
- The fuel-air mixture is not completely burnt during the combustion process, resulting in lower efficiency.
- The fuel-air mixture is also not well mixed, leading to poor combustion.
- The engine has a higher tendency for knocking, which lowers the efficiency.
2. 4 stroke SI engine:
- It has higher brake thermal efficiency compared to 2 stroke SI engine due to the better combustion process.
- The fuel-air mixture is well mixed and burnt completely, resulting in higher efficiency.
- The engine has a lower tendency for knocking, which improves the efficiency.
3. 4 stroke Cl engine:
- It has the highest brake thermal efficiency among the three engines due to the better combustion process.
- The fuel-air mixture is well mixed and burnt completely, resulting in higher efficiency.
- The engine has a lower tendency for knocking, which improves the efficiency.
- The engine also has a higher compression ratio, which improves the efficiency.
Conclusion:
The brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles is in the increasing order of 2 stroke SI engine < 4="" stroke="" si="" engine="" />< 4="" stroke="" cl="" engine.="" 4="" stroke="" cl="" />
Brake thermal efficiency is defined as the ratio of brake power output to the energy input from the fuel. It is expressed in percentage.
The three types of reciprocating engines commonly used in road vehicles are:
1. 2 stroke SI engine
2. 4 stroke SI engine
3. 4 stroke Cl engine
The increasing order of brake thermal efficiency of these engines is given as:
2 stroke SI engine < 4="" stroke="" si="" engine="" />< 4="" stroke="" cl="" />
Explanation:
1. 2 stroke SI engine:
- It has lower brake thermal efficiency compared to other engines due to the loss of unburnt fuel and incomplete combustion.
- The fuel-air mixture is not completely burnt during the combustion process, resulting in lower efficiency.
- The fuel-air mixture is also not well mixed, leading to poor combustion.
- The engine has a higher tendency for knocking, which lowers the efficiency.
2. 4 stroke SI engine:
- It has higher brake thermal efficiency compared to 2 stroke SI engine due to the better combustion process.
- The fuel-air mixture is well mixed and burnt completely, resulting in higher efficiency.
- The engine has a lower tendency for knocking, which improves the efficiency.
3. 4 stroke Cl engine:
- It has the highest brake thermal efficiency among the three engines due to the better combustion process.
- The fuel-air mixture is well mixed and burnt completely, resulting in higher efficiency.
- The engine has a lower tendency for knocking, which improves the efficiency.
- The engine also has a higher compression ratio, which improves the efficiency.
Conclusion:
The brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles is in the increasing order of 2 stroke SI engine < 4="" stroke="" si="" engine="" />< 4="" stroke="" cl="" engine.="" 4="" stroke="" cl="" />
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Brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles are given in the increasing order asa)2 stroke SI engine, 4 stroke SI engine, 4 stroke Cl engineb)2 stroke SI engine, 4 stroke Cl engine, 4 stroke SI enginec)4 stroke SI engine, 2 stroke SI engine, 4 stroke Cl engined)4 stroke Cl engine, 4 stroke SI engine, 2 stroke SI engineCorrect answer is option 'A'. Can you explain this answer?
Question Description
Brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles are given in the increasing order asa)2 stroke SI engine, 4 stroke SI engine, 4 stroke Cl engineb)2 stroke SI engine, 4 stroke Cl engine, 4 stroke SI enginec)4 stroke SI engine, 2 stroke SI engine, 4 stroke Cl engined)4 stroke Cl engine, 4 stroke SI engine, 2 stroke SI engineCorrect 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 Brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles are given in the increasing order asa)2 stroke SI engine, 4 stroke SI engine, 4 stroke Cl engineb)2 stroke SI engine, 4 stroke Cl engine, 4 stroke SI enginec)4 stroke SI engine, 2 stroke SI engine, 4 stroke Cl engined)4 stroke Cl engine, 4 stroke SI engine, 2 stroke SI engineCorrect 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 Brake thermal efficiency of the three types of reciprocating engines commonly used in road vehicles are given in the increasing order asa)2 stroke SI engine, 4 stroke SI engine, 4 stroke Cl engineb)2 stroke SI engine, 4 stroke Cl engine, 4 stroke SI enginec)4 stroke SI engine, 2 stroke SI engine, 4 stroke Cl engined)4 stroke Cl engine, 4 stroke SI engine, 2 stroke SI engineCorrect answer is option 'A'. Can you explain this answer?.
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