Mechanical Engineering Exam > Mechanical Engineering Questions > Consider the following statements:1. Petrol e...
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Consider the following statements:
1. Petrol engines are quantity governed.
2. SI engine combustion is heteroge-neous.
3. Lean mixturer is required during idling.
4. Choke supplies rich mixture for cold starting.
5. Stoichiometric AJFratio for IC engine fuels is about 18.
1. Petrol engines are quantity governed.
2. SI engine combustion is heteroge-neous.
3. Lean mixturer is required during idling.
4. Choke supplies rich mixture for cold starting.
5. Stoichiometric AJFratio for IC engine fuels is about 18.
Which of these are correct statements ?
- a)1,2, 4 and 5
- b)1 and 4
- c)1,3 and 4
- d)3 and 4
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Consider the following statements:1. Petrol engines are quantity gover...
Combustion in SI engine is homogeneous
Rich mixture is required during idling
Stoichiometric A/F ratio for 1C engine fuels is about 15.
Rich mixture is required during idling
Stoichiometric A/F ratio for 1C engine fuels is about 15.
Most Upvoted Answer
Consider the following statements:1. Petrol engines are quantity gover...
Statement analysis:
Let's analyze each statement one by one:
1. Petrol engines are quantity governed.
2. SI engine combustion is heterogeneous.
3. Lean mixture is required during idling.
4. Choke supplies rich mixture for cold starting.
5. Stoichiometric AFR ratio for IC engine fuels is about 18.
Correct statements:
After analyzing each statement, we find that the correct statements are:
1. Petrol engines are quantity governed.
4. Choke supplies rich mixture for cold starting.
Explanation:
1. Petrol engines are quantity governed:
- In a petrol engine, the quantity of fuel-air mixture entering the engine is controlled by the throttle valve. The throttle valve regulates the flow of air into the engine, and the fuel flow is adjusted accordingly to maintain the desired air-fuel ratio.
- This statement is correct as petrol engines use throttle control to regulate the quantity of fuel-air mixture.
4. Choke supplies rich mixture for cold starting:
- During cold starting, the engine requires a richer fuel-air mixture to start easily. The choke valve restricts the air intake, thus creating a vacuum in the carburetor throat. This vacuum draws more fuel into the engine, resulting in a richer mixture.
- This statement is correct as the choke supplies a rich mixture during cold starting.
Incorrect statements:
2. SI engine combustion is heterogeneous:
- In a spark-ignition (SI) engine, the combustion process is homogeneous, meaning the fuel-air mixture is uniformly mixed before combustion. This allows for a more controlled and efficient combustion process.
- This statement is incorrect as SI engine combustion is homogeneous.
3. Lean mixture is required during idling:
- During idling, when the engine is running at low speeds or at rest, a lean fuel-air mixture is required to minimize fuel consumption and emissions. A lean mixture refers to a mixture with a higher proportion of air compared to fuel.
- This statement is incorrect as a lean mixture is required during idling.
5. Stoichiometric AFR ratio for IC engine fuels is about 18:
- The stoichiometric air-fuel ratio (AFR) is the ideal ratio at which complete combustion occurs. For gasoline (petrol) engines, the stoichiometric AFR is around 14.7:1, meaning 14.7 parts of air to 1 part of fuel.
- This statement is incorrect as the stoichiometric AFR ratio for IC engine fuels is not about 18, but around 14.7.
Conclusion:
After analyzing each statement, we find that statements 1 and 4 are correct, while statements 2, 3, and 5 are incorrect. Therefore, the correct option is 'B' - 1 and 4.
Let's analyze each statement one by one:
1. Petrol engines are quantity governed.
2. SI engine combustion is heterogeneous.
3. Lean mixture is required during idling.
4. Choke supplies rich mixture for cold starting.
5. Stoichiometric AFR ratio for IC engine fuels is about 18.
Correct statements:
After analyzing each statement, we find that the correct statements are:
1. Petrol engines are quantity governed.
4. Choke supplies rich mixture for cold starting.
Explanation:
1. Petrol engines are quantity governed:
- In a petrol engine, the quantity of fuel-air mixture entering the engine is controlled by the throttle valve. The throttle valve regulates the flow of air into the engine, and the fuel flow is adjusted accordingly to maintain the desired air-fuel ratio.
- This statement is correct as petrol engines use throttle control to regulate the quantity of fuel-air mixture.
4. Choke supplies rich mixture for cold starting:
- During cold starting, the engine requires a richer fuel-air mixture to start easily. The choke valve restricts the air intake, thus creating a vacuum in the carburetor throat. This vacuum draws more fuel into the engine, resulting in a richer mixture.
- This statement is correct as the choke supplies a rich mixture during cold starting.
Incorrect statements:
2. SI engine combustion is heterogeneous:
- In a spark-ignition (SI) engine, the combustion process is homogeneous, meaning the fuel-air mixture is uniformly mixed before combustion. This allows for a more controlled and efficient combustion process.
- This statement is incorrect as SI engine combustion is homogeneous.
3. Lean mixture is required during idling:
- During idling, when the engine is running at low speeds or at rest, a lean fuel-air mixture is required to minimize fuel consumption and emissions. A lean mixture refers to a mixture with a higher proportion of air compared to fuel.
- This statement is incorrect as a lean mixture is required during idling.
5. Stoichiometric AFR ratio for IC engine fuels is about 18:
- The stoichiometric air-fuel ratio (AFR) is the ideal ratio at which complete combustion occurs. For gasoline (petrol) engines, the stoichiometric AFR is around 14.7:1, meaning 14.7 parts of air to 1 part of fuel.
- This statement is incorrect as the stoichiometric AFR ratio for IC engine fuels is not about 18, but around 14.7.
Conclusion:
After analyzing each statement, we find that statements 1 and 4 are correct, while statements 2, 3, and 5 are incorrect. Therefore, the correct option is 'B' - 1 and 4.
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Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. 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 Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. 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 Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. 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 Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. 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 Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. Can you explain this answer?.
Solutions for Consider the following statements:1. Petrol engines are quantity governed.2. SI engine combustion is heteroge-neous.3. Lean mixturer is required during idling.4. Choke supplies rich mixture for cold starting.5. Stoichiometric AJFratio for IC engine fuels is about 18.Which of these are correct statements ?a)1,2, 4 and 5b)1 and 4c)1,3 and 4d)3 and 4Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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