Circular Orbits MCQ

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• What is the eccentricity of a GEO?
  ক

  1.01

  খ

  0.87

  গ

  1.0

  ঘ

  0.0
• What is the flight path angle of a satellite in circular orbit of 30,000 km from earth’s surface and a true anomaly of 45°?
  ক

  22.5°

  খ

  0°

  গ

  45°

  ঘ

  27°
• What is the additional speed required to escape from earth’s GEO? GEO altitude from earth’s surface is 35,786 km. Earth’s radius is 6,378 km.
  ক

  1.274 km/s

  খ

  4.348 km/s

  গ

  3.075 km/s

  ঘ

  2.091 km/s
• A sidereal day for Mars is 24.623 hours. ISRO is planning to put a satellite in geostationary orbit around Mars. What should be the altitude from the surface of Mars to achieve this goal? Radius of Mars is 3,389.5 km and gravitational parameter is 42,828 km3/s2.
  ক

  17,038.14 km

  খ

  25,012.11 km

  গ

  20,427.64 km

  ঘ

  13648.64 km
• What is the angular velocity of earth given one sidereal day of earth is 23 hours 55 minutes and 48 seconds?
  ক

  7.293 x 10-5 rad/s

  খ

  7.05 x 10-5 rad/s

  গ

  4.236 x 10-5 rad/s

  ঘ

  1.223 x 10-3 rad/s
• What is the specific energy of a satellite in circular orbit of radius 7078 km around earth? Given, gravitational parameter of earth is 398,600 km3/s2.
  ক

  -90.14 km2/s2

  খ

  -180.15 km2/s2

  গ

  -30.13 km2/s2

  ঘ

  -28.16 km2/s2
• What is the sidereal time period of a probe in a circular orbit around Mars? The probe is orbiting at an altitude of 500 km from the surface of Mars. Radius of Mars is 3,389.5 km and its mass is 6.39 x 1023 kg.
  ক

  2.48 hrs

  খ

  2.05 hrs

  গ

  2.16 hrs

  ঘ

  1.89 hrs
• What is the velocity of a spacecraft in a circular orbit of 1,000 km from the surface of Mars? Radius of Mars is 3,389.5 km and its mass is 6.39 x 1023 kg.
  ক

  7.233 km/s

  খ

  4.525 km/s

  গ

  3.117 km/s

  ঘ

  3.989 km/s
• There is no radial velocity component if a satellite is travelling in a circular orbit.
  ক

  True

  খ

  False