If the perigee and apogee lie in the same equatorial plane, then which symmetry is exhibited by the ground tracks?

Axis symmetry

Translation symmetry

180 deg rotational symmetry

90 deg vertical symmetry

Correct Answer : 180 deg rotational symmetry

Explanation : When the perigee and apogee lie in the same equatorial plane, the argument of perigee is zero. In that case, the ground track of the satellite in the orbit appears to have a 180-degree rotational symmetry about the orbital nodes i.e. it appears both same above and below the equator of the Earth.

Recently Updated in Spaceflight Mechanics Questions

What are the disadvantages of the optical sensors?

They are not efficient

Weather must be favorable

They are not accurate

Satellite must be in darkness

Correct Answer : Option (B) : Weather must be favorable

Explanation : The optical sensors are very accurate in determining the satellite. For taking a good photo, there are some conditions that have to be followed- good weather conditions, correct lighting and the satellite must be in the sunlight.

Which of these devices is used to observe objects by having two or more antennas with high aperture?

Telescope

Hyper telescope

Radio interferometer

Optical Interferometer

Correct Answer : Option (C) : Radio interferometer

Explanation : Radio interferometers are sensors which accurately measure the directional information of a satellite using radio interferometry. It makes use of 2 or more antennas of high aperture and waves interferes on the same receiver. This is similar to the double- slit experiment phenomenon.

Which of these radars operate by identifying signature od a booster by disturbance in ionosphere?

Pulse radar

Surface radar

Continuous wave radar

Over- the- horizon radar

Correct Answer : Option (D) : Over- the- horizon radar

Explanation : OTH radar operates on the principle of detecting launches and identifying the signature of a particular booster by the disturbance it causes in the ionosphere.