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Electronics Engineering Objective Questions { Radar Engineering and Satellite Communication }

71. When P is the peak transmitted pulse power, the maximum range of the radar is proportional to
A. P
B. (P)1/2
C. (p)1 /4
D. (1))114
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72. The minimum receivable signal in radar receiver which has an IF bandwidth of 1.5 MHz and a 9 dB noise figure will be
A.4.17 x 10-1? W
B. 4.17 x 10-12 W
C.4.17 x 10-14 W
D. 4.17 x 10-16W
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73. The maximum range of a radar depends on all of the following EXCEPT
A. peak transmitted pulse power
B. direction of movement of target
C. target area
D. capture area of antenna
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74. The antenna used for radar is
A. paraboloidal antenna
B. horn fed paraboloid reflectors
C. dipole
D. all of the above
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75. The noise figure of a radar receiver is 12 dB, and its bandwidth is 2.5 Mhz. The value of Pminfor this radar will be
A. 1.59 x 10-9 W
B. 1.59 x 10-13 W
C. 1.59x 1015W
D. 1.59x 10-17 W
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76. An MTI radar operates at 10 GHz with PRF of 3000 ppps. The lowest blind will be
A. 40 km/hr
B. 66 km/hr
C. 81 lcm/hr
D. 162 lcm/hr
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77. The delay unit section of the VRM/delay unit can De used to
A. extend the range of radar
B. reduce radar interference expand an area for examination
C. both (a) & (b)
D. none of the above
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