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ECE Objective Questions { Antenna }



99. The maximum effective aperture of a short dipole is nearly
A. 0.00119 X.2
B.0.0119 X2
C.0.119 X2
D. 1.19 X2

100. The maximum effective aperture of a microwave antenna which has a directivity of 900, wil be
A.71.619 X2
B.716.19X2
C.7161.9 X2
D.71619 X2

101. The gain of an antenna with a circular aperture of diameter 3 metres at a frequency of 5 GHz, will be
A.2.4674
B.24.674
C.246.74
D.24674

102. The radiation resistance of a ?16 wire dipole in free space will be nearly
A.1 SI
B.3 n
C. 13 SZ
D. 30 SI

103. The total field produced by an antenna array system at a great distance from it is
A. sum of the fields produced by the individual antennas of the array system
B. directional gain of antenna
C. linear antenna gain
D. vector sum of the fields produced by the individual antennas of the array system.

104. A broad side array is shown in Fig. 13.4 in which the elements are placed at equal distancdes. The direction of maximum radiation is represented by
A. AA
B. BB
C. CC
D.DD

105. The radiation pattern of two element collinear array is represented in
A. figure A
B. figure B
C. figure C
D. figure D

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