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Consider the following statements regarding the satellite imaging: <br> 1. The satellite orbit is fixed in the inertial space<br> 2. During successive across-track imaging, the earth rotates beneath the sensor<br> 3. The satellite images a skewed area<br>Which one of the following statements is/are correct?
A
1, 2, 3
B
1, 3
C
2, 3
D
1, 2
Correct Answer:
1, 2, 3
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Reject
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Consider the following statements.
1. The time period of satellite does not depend on the radius of the orbit.
2. The orbital velocity is inversely proportional to the square root of the radius of the orbit.
3. The orbital velocity of a satellite increases with the radius of the orbit.
Which of the statement(s) given above is/are correct?
A
Only 1
B
Only 2
C
1 and 2
D
1, 2 and 3
What is the area swept by a satellite in an elliptical orbit around earth at t = T/5, where T is the time period of the orbit? Given, semi-major axis and semi-minor axis of the orbit are 9,000 km and 4,000 km respectively.
A
22.62 x 106 km2
B
29.89 x 106 km2
C
120.5 x 103 km2
D
117.9 x 104 km2
Which of the following option is correct for the given statements about gray scale and binary imaging? Statement 1: All binary images are gray scale images. Statement 2: In gray scale imaging, every pixel is represented by 8 bits.
A
F, F
B
T, F
C
F, T
D
T, T
A satellite is seen after every 8 hours. If it rotates opposite to that of the earth, what is its angular velocity about the centre of the earth? Assume the earth is perfectly spherical and the satellite is in the equatorial plane.
A
pi/2
B
pi/4
C
pi/6
D
pi/8
If the standard gravitational parameter of earth, μ is 398,600 km3/s2 and the radius of earth is 6378 km, what is the period of a satellite revolving around earth in a circular orbit 500 kms above the surface of the earth?
A
2,012.2 s
B
5,801.06 s
C
1,156.21 s
D
937.267 s
At an instant of time, a satellite in an elliptical orbit is at a distance of 500 km from the surface of the earth. If the semi major axis of the orbit is 8500 km in length, determine the magnitude of the satellite velocity. Take μ = 3.986 x 1014 m3/sec2.
A
8118.33 m/s
B
8813.38 m/s
C
8311.38 m/s
D
8181.38 m/s
What is the specific angular momentum of an elliptical orbit, if the flight path angle of the satellite in orbit at an instant is 15°? The satellite is travelling at a velocity of 10.7 km/s at the same instant and is parked at an altitude of 7048 km measured from earth’s center.
A
70,234.12 km2/s
B
72,876.32 km2/s
C
61,456.23 km2/s
D
4,536.32 km2/s
A space station moving in a circular orbit around the earth goes into a new bound orbit by fixing its engine radially outwards. This orbit is
A
larger circle
B
smaller circle
C
an ellipse
D
a parabola
Which of these statements are correct regarding the atmosphere of the earth:
1. It is enveloping the earth because of gravity.
2. Its density decreases with increasing height from the surface of the earth.
3. Its characteristic composition is same throughout its height.
4. Amount of pressure it exerts on earth's surface at sea level is called one atm sphere.
A
1 and 4
B
2 and 4
C
2, 3 and 4
D
1, 2 and 4
Consider the following statements. The acceleration due to earth's gravity decreases if
1. we go up from the surface of the earth.
2. we go from the equator towards the pole.
3. the rotation speed of the earth is increased.
4. we go down from the surface of the earth towards its centre.
Which of these statements are correct?
A
1, 2 and 3
B
1, 3 and 4
C
1. 2 and 4
D
1, 2, 3 and 4