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ECE Objective Questions { Radar Engineering and Satellite Communication }



99.  In a doppler radar, the transmitted frequency was 100 MHz whereas that of received echo was 110 MHz. This indicates that
A. the target is moving away from the radar
B. the target is moving towards the radar
C. the target is at an angle with the horizontal determined by change in frequency
D. the target is moving towards the radar with a speed of 10 m/s

100. The third blind speed starting from the lowest in case of a 3 cm MTI emitting at a pulse repetition rate of! kHz would be
A. 54 lan/hr
B. 108 lan/hr
C. 162 lcm/hr
D. 216 km/hr

101. If (AA), (AE) and (E) are the azimuth difference, the elevation difference signal and the sum signal in a monopulse tracking radar system, the for an angle (0) between the azimuth difference signal and the sum signal, the azimuth angular error detector output is given by
A. ?E cos 0
B. ? cos 0
C. ? sin 0
D. ? sin 0

102. To cover all inhabited regions of the Earth, the number of geosynchronous communication satellite required is
A.5
B.3
C.10
D.2

103. For global communication, the number of satellites needed is
A.1
B.3
C.10
D.15

104. The ending part of the popular teleserial Mahabharat will be beamed to the viewers via
A. WESTAR
B. INSAT-IC
C.ARABSAT
D. INSAT-ID

105. The first geostationary satellite launched in 1965 was called
A. ANIK
B. EARLY BIRD (Intelsat-1)
C. WESTAR
D. MOLNIYA

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