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Space & Astronomy15 Concepts & Facts

ISRO Launch Vehicles GK Questions & Answers

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India's space launch capability developed through an incremental technological progression spearheaded by the Indian Space Research Organisation. The program achieved orbital launch capability in July 1980 under Project Director Dr. A.P.J. Abdul Kalam when the Satellite Launch Vehicle-3 successfully injected the Rohini-1 satellite into Low Earth Orbit using an all-solid four-stage configuration. To validate strap-on booster technology and closed-loop guidance systems, ISRO developed the Augmented Satellite Launch Vehicle during the late 1980s. These experimental systems paved the way for the Polar Satellite Launch Vehicle in 1993, which matured into India's primary launch workhorse for delivering Earth observation payloads to Sun-Synchronous Polar Orbits and communication payloads to Geosynchronous Transfer Orbits.

The PSLV architecture employs a four-stage propulsion configuration alternating between solid and liquid stages. The first stage uses Hydroxyl-Terminated Polybutadiene solid propellant augmented by strap-on motors; the second stage utilizes the liquid-fueled Vikas engine burning unsymmetrical dimethylhydrazine and nitrogen tetroxide; the third stage uses solid HTPB; and the fourth stage uses liquid monomethylhydrazine and mixed oxides of nitrogen. Configured in XL, Core Alone, and DL variants, PSLV launched Chandrayaan-1, the Mars Orbiter Mission, and deployed a record 104 satellites on flight PSLV-C37 in February 2017. To launch heavier payloads, ISRO developed the Geosynchronous Satellite Launch Vehicle Mk II, integrating an indigenous Cryogenic Upper Stage (CE-7.5) fueled by liquid hydrogen at minus 253 degrees Celsius and liquid oxygen at minus 183 degrees Celsius.

Heavy-lift operations rely on Launch Vehicle Mark 3 (LVM3), capable of placing 4,000 kilograms into Geosynchronous Transfer Orbit and 8,000 kilograms into Low Earth Orbit. LVM3 combines two S200 solid rocket boosters, an L110 core liquid stage with twin Vikas engines, and a high-thrust CE-20 cryogenic engine. LVM3 successfully injected Chandrayaan-2 and Chandrayaan-3 into translunar trajectories and is designated for the Gaganyaan crewed mission. For cost-effective commercial launches, ISRO introduced the Small Satellite Launch Vehicle (SSLV), utilizing three solid propulsion stages and a liquid Velocity Trimming Module. Vehicle stages, propellant chemistries, cryogenic thermodynamic cycles, and launch capacities represent recurring themes in UPSC CSE General Studies Paper III, CDS, and technical service examinations.

Key Concepts & Self-Assessment15 Key Facts

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#1
PSLV is a 4-stage launch vehicle alternating between solid (stages 1 & 3) and liquid (stages 2 & 4) propellants, powering Chandrayaan-1 and Mangalyaan.
#2
GSLV Mk II incorporates an indigenous Cryogenic Upper Stage (CE-7.5) burning liquid hydrogen (LH2) and liquid oxygen (LOX) for geostationary launches.
#3
LVM3 (Launch Vehicle Mark 3) is ISRO's heavy-lift launcher capable of carrying 4,000 kg to GTO and 8,000 kg to LEO, powered by two S200 solid boosters and a CE-20 cryogenic engine.
#4
LVM3 successfully launched India's Chandrayaan-2 and Chandrayaan-3 lunar missions and is selected for India's human spaceflight program Gaganyaan.
#5
The Small Satellite Launch Vehicle (SSLV) is a three-stage solid rocket with a liquid Velocity Trimming Module (VTM) designed for rapid, low-cost commercial launches.
#6
India's first satellite launch vehicle, SLV-3, led by project director Dr. A.P.J. Abdul Kalam, successfully placed the Rohini satellite (RS-1) into orbit on July 18, 1980.
#7
The Vikas engine, developed by Nambi Narayanan and ISRO engineers in the 1970s, powers the second stage of PSLV and the core stage of GSLV using unsymmetrical dimethylhydrazine (UDMH).
#8
PSLV-C37 created a world record on February 15, 2017, by deploying 104 satellites into orbit in a single mission using the PSLV-XL configuration.
#9
The first stage of PSLV is one of the largest solid rocket boosters in the world, utilizing hydroxyl-terminated polybutadiene (HTPB) fuel with up to six strap-on motors.
#10
GSLV Mk II can inject payloads of up to 2,500 kg into Geosynchronous Transfer Orbit (GTO) and 5,000 kg into Low Earth Orbit (LEO).
#11
The L110 core liquid stage of LVM3 burns 110 tonnes of liquid propellant through two clustered Vikas engines, flanked by two massive S200 solid rocket boosters.
#12
NewSpace India Limited (NSIL), incorporated in 2019 as ISRO's commercial arm, commercialized the LVM3 by launching 72 satellites for the global OneWeb constellation.
#13
The Reusable Launch Vehicle Technology Demonstrator (RLV-TD) achieved autonomous runway landing milestones under Project Pushpak at the Aeronautical Test Range in Chitradurga.
#14
Satish Dhawan Space Centre (SDSC-SHAR) at Sriharikota barrier island, Andhra Pradesh, serves as ISRO's primary orbital spaceport, equipped with two operational launch pads.
#15
ISRO is developing the Next Generation Launch Vehicle (NGLV), designated Soorya, featuring semi-cryogenic methane-LOX propulsion capable of lifting up to 30 tonnes to Low Earth Orbit.

Subject Specialist Commentary

Analytical perspective & practical exam advice from the Master10 academic board

Educator's Insight
Space launch vehicles are multi-stage rockets designed to overcome Earth's gravity and place satellites into precise orbits. India's journey began with the modest SLV-3 under Dr. A.P.J. Abdul Kalam in 1980. Today, ISRO relies on a versatile rocket fleet. The workhorse Polar Satellite Launch Vehicle uses four alternating solid and liquid stages. For heavier satellites and deep-space missions like Gaganyaan and Chandrayaan-3, ISRO deploys the heavy-lift LVM3, which features two massive solid boosters and an indigenous cryogenic upper stage.
UPSC and State PSC science papers love to test rocket staging and propellant types. A frequent exam trap mixes up PSLV stages: memorize the sequence as "Solid-Liquid-Solid-Liquid" (1-2-3-4). For the newer Small Satellite Launch Vehicle, remember it uses three solid stages topped by a liquid velocity trimming module. Pay close attention to payload capacities in prelims statement questions, especially distinguishing between Low Earth Orbit and Geosynchronous Transfer Orbit limits for LVM3 versus GSLV Mk II.

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