{"id":90188,"date":"2025-06-01T10:22:33","date_gmt":"2025-06-01T10:22:33","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=90188"},"modified":"2025-06-01T10:22:33","modified_gmt":"2025-06-01T10:22:33","slug":"which-one-of-the-following-statements-about-air-pollution-caused-by-di","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/","title":{"rendered":"Which one of the following statements about air pollution caused by di"},"content":{"rendered":"

Which one of the following statements about air pollution caused by diesel engines is correct ?<\/p>\n

[amp_mcq option1=”It produces large quantity of carbon monoxide at lower and high temperatures” option2=”It produces large quantity of nitrogen oxides at lower and high temperatures” option3=”It produces large quantity of carbon monoxide at lower temperature and nitrogen oxides at high temperature” option4=”It produces large quantity of nitrogen oxides at lower temperature and carbon monoxide at high temperature” correct=”option3″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC CAPF – 2017<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nCombustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). CO is a product of incomplete combustion and is more prevalent when combustion temperatures and efficiency are lower, such as during engine start-up, idling, or low load conditions (lower temperatures). Nitrogen oxides (primarily NO and NO2) are formed at high temperatures and pressures when nitrogen and oxygen in the air react. Therefore, NOx production is significant at high engine loads and speeds, where combustion temperatures are high. Statement C correctly reflects this pattern: higher CO production at lower temperatures and higher NOx production at high temperatures.
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\nDiesel engines produce more CO under conditions of incomplete combustion (often at lower temperatures) and more NOx under conditions of high temperature and pressure (often at high engine loads).
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\nDiesel engines are also significant emitters of particulate matter (PM) and unburnt hydrocarbons (HC), particularly under rich-burn conditions or at lower temperatures. NOx formation is highly sensitive to temperature and the availability of oxygen and nitrogen; high temperatures break the strong N2 bond, allowing reactions with oxygen. CO formation is limited by insufficient oxygen or incomplete mixing, which is more likely at lower temperatures or during transient operation.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following statements about air pollution caused by diesel engines is correct ? [amp_mcq option1=”It produces large quantity of carbon monoxide at lower and high temperatures” option2=”It produces large quantity of nitrogen oxides at lower and high temperatures” option3=”It produces large quantity of carbon monoxide at lower temperature and nitrogen oxides at … <\/p>\n

Detailed SolutionWhich one of the following statements about air pollution caused by di<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1085],"tags":[1101,1136,1137],"class_list":["post-90188","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1101","tag-environment-and-ecology","tag-pollution","no-featured-image-padding"],"yoast_head":"\nWhich one of the following statements about air pollution caused by di<\/title>\n<meta name=\"description\" content=\"Combustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). CO is a product of incomplete combustion and is more prevalent when combustion temperatures and efficiency are lower, such as during engine start-up, idling, or low load conditions (lower temperatures). Nitrogen oxides (primarily NO and NO2) are formed at high temperatures and pressures when nitrogen and oxygen in the air react. Therefore, NOx production is significant at high engine loads and speeds, where combustion temperatures are high. Statement C correctly reflects this pattern: higher CO production at lower temperatures and higher NOx production at high temperatures. Diesel engines produce more CO under conditions of incomplete combustion (often at lower temperatures) and more NOx under conditions of high temperature and pressure (often at high engine loads).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following statements about air pollution caused by di\" \/>\n<meta property=\"og:description\" content=\"Combustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). CO is a product of incomplete combustion and is more prevalent when combustion temperatures and efficiency are lower, such as during engine start-up, idling, or low load conditions (lower temperatures). Nitrogen oxides (primarily NO and NO2) are formed at high temperatures and pressures when nitrogen and oxygen in the air react. Therefore, NOx production is significant at high engine loads and speeds, where combustion temperatures are high. Statement C correctly reflects this pattern: higher CO production at lower temperatures and higher NOx production at high temperatures. Diesel engines produce more CO under conditions of incomplete combustion (often at lower temperatures) and more NOx under conditions of high temperature and pressure (often at high engine loads).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:22:33+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following statements about air pollution caused by di","description":"Combustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). CO is a product of incomplete combustion and is more prevalent when combustion temperatures and efficiency are lower, such as during engine start-up, idling, or low load conditions (lower temperatures). Nitrogen oxides (primarily NO and NO2) are formed at high temperatures and pressures when nitrogen and oxygen in the air react. Therefore, NOx production is significant at high engine loads and speeds, where combustion temperatures are high. Statement C correctly reflects this pattern: higher CO production at lower temperatures and higher NOx production at high temperatures. Diesel engines produce more CO under conditions of incomplete combustion (often at lower temperatures) and more NOx under conditions of high temperature and pressure (often at high engine loads).","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following statements about air pollution caused by di","og_description":"Combustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). CO is a product of incomplete combustion and is more prevalent when combustion temperatures and efficiency are lower, such as during engine start-up, idling, or low load conditions (lower temperatures). Nitrogen oxides (primarily NO and NO2) are formed at high temperatures and pressures when nitrogen and oxygen in the air react. Therefore, NOx production is significant at high engine loads and speeds, where combustion temperatures are high. Statement C correctly reflects this pattern: higher CO production at lower temperatures and higher NOx production at high temperatures. Diesel engines produce more CO under conditions of incomplete combustion (often at lower temperatures) and more NOx under conditions of high temperature and pressure (often at high engine loads).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:22:33+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-air-pollution-caused-by-di\/","name":"Which one of the following statements about air pollution caused by di","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:22:33+00:00","dateModified":"2025-06-01T10:22:33+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Combustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). 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