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Consider the following statements for NOx emissions from I.C. engines:
1. Formation of NOx depends upon combustion temperature
2. Formation of NOx depends upon type of coolant used
3. Exhaust gas recirculation is an effective means for control of NOx
4. Activated Platinum is used for reduction of NOx
Which of the statements given above are correct?
1. Formation of NOx depends upon combustion temperature
2. Formation of NOx depends upon type of coolant used
3. Exhaust gas recirculation is an effective means for control of NOx
4. Activated Platinum is used for reduction of NOx
Which of the statements given above are correct?
- a)1 and 2
- b)1, 2 and 3
- c)2 and 4
- d)1 and 3
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements for NOx emissions from I.C. engines:...
Ans. (b)
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Consider the following statements for NOx emissions from I.C. engines:...
1. Formation of NOx depends upon combustion temperature:
This statement is correct. The formation of NOx (nitrogen oxides) in internal combustion engines is primarily dependent on the combustion temperature. High temperatures during combustion promote the formation of thermal NOx, which occurs when oxygen and nitrogen in the air react at high temperatures. This reaction is known as the Zeldovich mechanism.
2. Formation of NOx depends upon the type of coolant used:
This statement is incorrect. The formation of NOx in internal combustion engines is not influenced by the type of coolant used. Coolant is used to regulate the engine temperature and has no direct effect on the formation of NOx.
3. Exhaust gas recirculation is an effective means for control of NOx:
This statement is correct. Exhaust gas recirculation (EGR) is a technique used to control NOx emissions in internal combustion engines. It involves redirecting a portion of the exhaust gases back into the engine's intake manifold, which reduces the combustion temperature and limits the formation of NOx. By diluting the air-fuel mixture with inert gases (exhaust gases), EGR reduces the oxygen concentration during combustion, thereby reducing the peak flame temperature and suppressing the formation of NOx.
4. Activated platinum is used for the reduction of NOx:
This statement is incorrect. Activated platinum is not used for the reduction of NOx in internal combustion engines. However, it is commonly used as a catalyst in catalytic converters to reduce other harmful emissions such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). Platinum acts as a catalyst by promoting the chemical reactions that convert these pollutants into less harmful substances.
In conclusion, the correct statements are:
1. Formation of NOx depends upon combustion temperature.
3. Exhaust gas recirculation is an effective means for the control of NOx.
Therefore, the correct answer is option B: 1, 2, and 3.
This statement is correct. The formation of NOx (nitrogen oxides) in internal combustion engines is primarily dependent on the combustion temperature. High temperatures during combustion promote the formation of thermal NOx, which occurs when oxygen and nitrogen in the air react at high temperatures. This reaction is known as the Zeldovich mechanism.
2. Formation of NOx depends upon the type of coolant used:
This statement is incorrect. The formation of NOx in internal combustion engines is not influenced by the type of coolant used. Coolant is used to regulate the engine temperature and has no direct effect on the formation of NOx.
3. Exhaust gas recirculation is an effective means for control of NOx:
This statement is correct. Exhaust gas recirculation (EGR) is a technique used to control NOx emissions in internal combustion engines. It involves redirecting a portion of the exhaust gases back into the engine's intake manifold, which reduces the combustion temperature and limits the formation of NOx. By diluting the air-fuel mixture with inert gases (exhaust gases), EGR reduces the oxygen concentration during combustion, thereby reducing the peak flame temperature and suppressing the formation of NOx.
4. Activated platinum is used for the reduction of NOx:
This statement is incorrect. Activated platinum is not used for the reduction of NOx in internal combustion engines. However, it is commonly used as a catalyst in catalytic converters to reduce other harmful emissions such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). Platinum acts as a catalyst by promoting the chemical reactions that convert these pollutants into less harmful substances.
In conclusion, the correct statements are:
1. Formation of NOx depends upon combustion temperature.
3. Exhaust gas recirculation is an effective means for the control of NOx.
Therefore, the correct answer is option B: 1, 2, and 3.
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Consider the following statements for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct 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 for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct 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 for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct answer is option 'B'. Can you explain this answer?.
Consider the following statements for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct 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 for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct 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 for NOx emissions from I.C. engines:1. Formation of NOx depends upon combustion temperature2. Formation of NOx depends upon type of coolant used3. Exhaust gas recirculation is an effective means for control of NOx4. Activated Platinum is used for reduction of NOxWhich of the statements given above are correct?a)1 and 2b)1, 2 and 3c)2 and 4d)1 and 3Correct answer is option 'B'. Can you explain this answer?.
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