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Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.
Reason (R): In a four stroke engine one cycle is completed in two revolutions.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'D'. Can you explain this answer?
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Assertion (A): Power generated by a four stroke engine working on Otto...
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Assertion (A): Power generated by a four stroke engine working on Otto...
Assertion (A): Power generated by a four-stroke engine working on the Otto cycle is higher than the power generated by a two-stroke engine for the same swept volume, speed, temperature, and pressure conditions.
Reason (R): In a four-stroke engine, one cycle is completed in two revolutions.
The correct answer is option 'D' - A is false but R is true.
Explanation:
To understand why the power generated by a four-stroke engine is not necessarily higher than that of a two-stroke engine, let's first discuss the working principles of both engines.
Four-Stroke Engine:
A four-stroke engine completes one full cycle in four strokes: intake, compression, power, and exhaust. Each stroke requires one revolution of the crankshaft. During the intake stroke, the air-fuel mixture is drawn into the cylinder. In the compression stroke, the mixture is compressed. The power stroke is where the combustion of the compressed mixture takes place, generating power. Finally, the exhaust stroke expels the burned gases from the cylinder.
Two-Stroke Engine:
A two-stroke engine completes one full cycle in two strokes: compression and power. Each stroke requires one revolution of the crankshaft. Unlike the four-stroke engine, the two-stroke engine combines the intake and exhaust processes into a single stroke. During the compression stroke, the air-fuel mixture is compressed, and in the power stroke, combustion occurs, generating power.
Comparison:
Now, let's compare the power generation between the two types of engines:
- The power generated by an engine depends on various factors, including the swept volume, speed, temperature, and pressure conditions. However, it is not solely determined by the number of strokes per cycle.
- While it is true that a four-stroke engine completes one cycle in two revolutions, it does not guarantee that it will generate more power than a two-stroke engine.
- The power generated by an engine is primarily determined by the efficiency of the combustion process, which includes factors such as the air-fuel mixture, combustion chamber design, ignition timing, etc.
- Both four-stroke and two-stroke engines can be designed to achieve high power outputs depending on their specific configurations and applications.
- In some cases, two-stroke engines can generate higher power outputs due to their simpler design, fewer moving parts, and the ability to complete one full cycle in fewer strokes.
- However, four-stroke engines are generally more fuel-efficient and produce lower emissions compared to two-stroke engines.
- The power output of an engine is also influenced by factors such as the fuel used, engine size, turbocharging, supercharging, etc.
Conclusion:
In summary, the assertion (A) is false because the power generated by a four-stroke engine is not necessarily higher than that of a two-stroke engine for the same swept volume, speed, temperature, and pressure conditions. The reason (R) is true, as a four-stroke engine does complete one cycle in two revolutions, but this does not directly correlate to higher power output.
Reason (R): In a four-stroke engine, one cycle is completed in two revolutions.
The correct answer is option 'D' - A is false but R is true.
Explanation:
To understand why the power generated by a four-stroke engine is not necessarily higher than that of a two-stroke engine, let's first discuss the working principles of both engines.
Four-Stroke Engine:
A four-stroke engine completes one full cycle in four strokes: intake, compression, power, and exhaust. Each stroke requires one revolution of the crankshaft. During the intake stroke, the air-fuel mixture is drawn into the cylinder. In the compression stroke, the mixture is compressed. The power stroke is where the combustion of the compressed mixture takes place, generating power. Finally, the exhaust stroke expels the burned gases from the cylinder.
Two-Stroke Engine:
A two-stroke engine completes one full cycle in two strokes: compression and power. Each stroke requires one revolution of the crankshaft. Unlike the four-stroke engine, the two-stroke engine combines the intake and exhaust processes into a single stroke. During the compression stroke, the air-fuel mixture is compressed, and in the power stroke, combustion occurs, generating power.
Comparison:
Now, let's compare the power generation between the two types of engines:
- The power generated by an engine depends on various factors, including the swept volume, speed, temperature, and pressure conditions. However, it is not solely determined by the number of strokes per cycle.
- While it is true that a four-stroke engine completes one cycle in two revolutions, it does not guarantee that it will generate more power than a two-stroke engine.
- The power generated by an engine is primarily determined by the efficiency of the combustion process, which includes factors such as the air-fuel mixture, combustion chamber design, ignition timing, etc.
- Both four-stroke and two-stroke engines can be designed to achieve high power outputs depending on their specific configurations and applications.
- In some cases, two-stroke engines can generate higher power outputs due to their simpler design, fewer moving parts, and the ability to complete one full cycle in fewer strokes.
- However, four-stroke engines are generally more fuel-efficient and produce lower emissions compared to two-stroke engines.
- The power output of an engine is also influenced by factors such as the fuel used, engine size, turbocharging, supercharging, etc.
Conclusion:
In summary, the assertion (A) is false because the power generated by a four-stroke engine is not necessarily higher than that of a two-stroke engine for the same swept volume, speed, temperature, and pressure conditions. The reason (R) is true, as a four-stroke engine does complete one cycle in two revolutions, but this does not directly correlate to higher power output.
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Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'D'. Can you explain this answer?
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Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'D'. Can you explain this answer?.
Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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ample number of questions to practice Assertion (A): Power generated by a four stroke engine working on Otto cycle is higher than the power generated by a two stroke engine for the same swept volume, speed,temperature and pressure conditions.Reason (R): In a four stroke engine one cycle is completed in two revolutions.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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