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With Reference to India’s Satellite Launch Vehicle, consider the following statements:

With reference to India’s satellite launch vehicle, consider the following statements:

  1. PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.
  2. Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
  3. GSLV MK III is a four-staged launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines.

Which of the statements given above is/are correct?(2018)

a) 1 only

b) 2 and 3 only

c) 1 and 2 only

d) 3 only

Answer: A

GSLV Mark III is a three-stage heavy lift launch vehicle developed by ISRO

PSLV is designed mainly to deliver the “earth-observation” or “remote-sensing” satellites with lift-off mass of up to about 1750 Kg to Sun-Synchronous circular polar orbits of 600-900 Km altitude. The GSLV is designed mainly to deliver the communication-satellites to the highly elliptical (typically 250 x 3.6000 Km) Geosynchronous Transfer Orbit (GTO). The satellite in GTO is further raised to its final destination, viz., Geo-synchronous Earth orbit (GEO) of about 3.6000 Km altitude (and zero degree inclination on equatorial plane) by firing its in-built on-board engines. 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 1 and 3 only particular location on Earth, thus avoiding the need of a tracking ground antenna and hence 

June 2023