127. The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about

A. 10 minutes on 5 consecutive days

B. 5 minutes on 10 consecutive days

C. 30 minutes for 5 consecutive days

D. one hour for 3 consecutive days

128. A geostationary satellite is one which

A. hangs motionless in space about 36,000 km above Earth

B. travels around the Earth in 24 hours

C. remains stationary about the Earth

D. appears stationary to everydody on Earth

129. Synchronous satellites orbit the Earth once in

A. 24 hours

B. 12 hours

C. 1 hour

D. 1 minute

130. A few minutes disturbance in communications occurs twice during Sun-blinding when line

A. Sun and satellite

B. Sun and Earth station

C. satellite and Earth station

D. Sun, satellite and Earth station

131. Assuming Earth to be a sphere of radius 6400 km and height ofa geosynchronous satellite above Earth as 36,000 km, the velocity of a geosynchronous satellite is km/hr.

A.28,000

B.15,000

C.36,000

D.11,100

132. Assuming a minimum angle of elevation of 50, a geoynchronous satellite remains in line-of-sight for percentage of Eargh'ssurface?

A.30.3

B.42.4

C.50

D.25

133. Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?

A. pressure of solar radiations

B. gravitational changes due to Sun and Moon

C. oblateness of the Earth

D. weight of thesatellite

Page **19** of **39**