51. Mark out the WRONG statement.
As compared to FDMA, the demand assignment system TDMA
52. APPLE was into orbit on 19 th June 1981 by European Space Agency (ESA) from
53. A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.
54. Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it
55. Which of the following statement regarding link loss for a satellite is wrong?
56. Depending on the technique used, digitized television requires a bit rate between __________ millions.
57. In selecting a satellite system, the First determining factor is its
58. Phase modulation is commonly-used for data transmission mainly because
59. India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit.
60. Most of the communication satellites are stationed to the West of their service areas in order to reduce their
61. The degradation of satellite solar cells with time is mainly due to
62. The echo heard by a telephone user on a satellite channel can be removed by using
63. The 1150 kg geosynchronous satellite INSAT-IA parked 36000 km above India had greatly improved India's
64. Presently, the worlds's largest and most advanced multi-purpose communication satellite is
65. A satellite link uses different frequencies for receiving and transmitting in order to
66. A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second.
67. Regarding TASI which one of the following statements is wrong?
68. Master control facility (MCF) for INSAT-2 series satellites is located at
69. The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch.
70. The distance of a synchronous satellite from Earth's surface is __________ km.
71. A typical error rate on satellite circuits is one bit error in
72. Geosynchronous communication satellites travel around the earth in circular orbits with a forward speed of about __________ km/h.
73. In satellite communication, highly directional antennas are used to
74. The average noise temperature of Earth, as viewed from space, is __________ °K.
75. Low-orbit satellites are not used for communications because they