{"id":1377,"date":"2024-02-17T19:36:43","date_gmt":"2024-02-17T14:06:43","guid":{"rendered":"https:\/\/lotusarise.com\/qna\/?p=1377"},"modified":"2024-04-03T07:13:11","modified_gmt":"2024-04-03T01:43:11","slug":"q-with-reference-to-indias-satellite-launch-vehicles-consider-the-following-statements","status":"publish","type":"post","link":"https:\/\/lotusarise.com\/qna\/upsc\/q-with-reference-to-indias-satellite-launch-vehicles-consider-the-following-statements","title":{"rendered":"Q.\u00a0With reference to India\u2019s satellite launch vehicles, consider the following statements:"},"content":{"rendered":"\n<ol class=\"wp-block-list\">\n<li>PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.<\/li>\n\n\n\n<li>Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.<\/li>\n\n\n\n<li>GSLV Mk III is a&nbsp;<strong>four-staged<\/strong>&nbsp;launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Which of the statements given above is\/are correct?<\/p>\n\n\n\n<ul class=\"mcq wp-block-list\">\n<li>1 only<\/li>\n\n\n\n<li>2 and 3<\/li>\n\n\n\n<li>1 and 2<\/li>\n\n\n\n<li>3 only<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Answer: (a) 1 only<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"pslv-and-gslv\">PSLV and GSLV<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Both&nbsp;<a href=\"https:\/\/lotusarise.com\/satellite-launch-vehicles-upsc\/\">PSLV (Polar Satellite Launch Vehicle)<\/a>&nbsp;and&nbsp;<a href=\"https:\/\/lotusarise.com\/satellite-launch-vehicles-upsc\/\">GSLV (Geosynchronous Satellite Launch Vehicle)<\/a>&nbsp;are the&nbsp;<strong>satellite-launch vehicles<\/strong>&nbsp;<strong>(rockets) developed by ISRO.<\/strong><\/li>\n\n\n\n<li><strong>PSLV is designed mainly to deliver the \u201cearth-observation\u201d or \u201cremote-sensing\u201d satellites<\/strong>&nbsp;with lift-off mass of up to about 1750 Kg to Sun-Synchronous circular polar orbits of 600-900 Km altitude.<\/li>\n\n\n\n<li>The remote sensing satellites orbit the earth from pole-to-pole (at about 98 deg orbital-plane inclination). An orbit is called sun-synchronous when the angle between the line joining the centre of the Earth and the satellite and the Sun is constant throughout the orbit.<\/li>\n\n\n\n<li>Due to their sun-synchronism nature, these orbits are also referred to as \u201cLow Earth Orbit (LEO)\u201d which enables the on-board camera to take images of the earth under the same sun-illumination conditions during each of the repeated visits, the satellite makes over the same area on ground thus making the satellite useful for earth resources monitoring.<\/li>\n\n\n\n<li>Apart from launching the remote sensing satellites to Sun-synchronous polar orbits, the PSLV is also used to launch the satellites of lower lift-off mass of up to about 1400 Kg to the elliptical Geosynchronous Transfer Orbit (GTO).<\/li>\n\n\n\n<li>PSLV is a four-staged launch vehicle with first and third stage using solid rocket motors and second and fourth stages using liquid rocket engines. It also uses strap-on motors to augment the thrust provided by the first stage, and depending on the number of these strap-on boosters, the PSLV is classified into its various versions like core-alone version (PSLV-CA), PSLV-G or PSLV-XL variants.<\/li>\n\n\n\n<li>The&nbsp;<strong>GSLV is designed mainly to deliver the communication-satellites<\/strong>&nbsp;to the highly elliptical (typically 250 x 36000 Km) Geosynchronous Transfer Orbit (GTO). The satellite in GTO is further raised to its final destination, viz., Geo-synchronous Earth orbit (GEO) of about 36000 Km altitude (and zero deg inclination on equatorial plane) by firing its in-built on-board engines.<\/li>\n\n\n\n<li>Due to their geo-synchronous nature, the satellites in these orbits appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth, thus avoiding the need of a tracking ground antenna and hence are useful for the communication applications.<\/li>\n\n\n\n<li>Two versions of the GSLV are being developed by ISRO. The first version, GSLV Mk-II, has the capability to launch satellites of lift-off mass of up to 2,500 kg to the GTO and satellites of up to 5,000 kg lift-off mass to the LEO.&nbsp;<strong>GSLV MK-II is a three-staged vehicle with first stage using solid rocket motor, second stage using Liquid fuel and the third stage, called Cryogenic Upper Stage, using cryogenic engine<\/strong>.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lotusarise.com\/wp-content\/uploads\/2024\/01\/launch_vehicles.webp\" alt=\"launch vehicles\" class=\"wp-image-47649\" title=\"\"><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which of the statements given above is\/are correct? Answer: (a) 1 only PSLV and GSLV<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1,3],"tags":[44],"years":[55],"class_list":["post-1377","post","type-post","status-publish","format-standard","hentry","category-upsc","category-prelims","tag-science-and-tech","years-55"],"acf":[],"taxonomy_info":{"category":[{"value":1,"label":"UPSC"},{"value":3,"label":"Prelims"}],"post_tag":[{"value":44,"label":"Science and Tech"}],"years":[{"value":55,"label":"2018"}]},"featured_image_src_large":false,"author_info":{"display_name":"LotusArise","author_link":"https:\/\/lotusarise.com\/qna\/author\/team-lotusarise"},"comment_info":0,"category_info":[{"term_id":1,"name":"UPSC","slug":"upsc","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":1269,"filter":"raw","cat_ID":1,"category_count":1269,"category_description":"","cat_name":"UPSC","category_nicename":"upsc","category_parent":0},{"term_id":3,"name":"Prelims","slug":"prelims","term_group":0,"term_taxonomy_id":3,"taxonomy":"category","description":"","parent":1,"count":1251,"filter":"raw","cat_ID":3,"category_count":1251,"category_description":"","cat_name":"Prelims","category_nicename":"prelims","category_parent":1}],"tag_info":[{"term_id":44,"name":"Science and Tech","slug":"science-and-tech","term_group":0,"term_taxonomy_id":44,"taxonomy":"post_tag","description":"","parent":0,"count":167,"filter":"raw"}],"_links":{"self":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/1377","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/comments?post=1377"}],"version-history":[{"count":0,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/1377\/revisions"}],"wp:attachment":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/media?parent=1377"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/categories?post=1377"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/tags?post=1377"},{"taxonomy":"years","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/years?post=1377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}