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Electrical Engineering Objective Questions { Electromagnetism }



85. Parabolic antenna is used at
A. long waves
B. medium waves
C. short waves
D. microwaves

86. EM waves in the frequency range 300 MHz to 30 GHz can be best transmitted using
A. Groundwave propagation
B. Duct propagation
C. sky wave propagation
D. none of these

87. Skip distance is
A. the minimum distance from the transmitter at which a stay wave of a given frequency is returned to earth from the ionosphere
B. the maximum distance from the transmitter at which a sky wave of a given frequency is returned to earth from the ionosphere3 x 108
C. metres 3 x 108
D.)" ' metres

88.  For a plane good conductor, skin depth varies
A. directly as the conductiarty cr
B. inversely as a
C. inversely as /(7-
D. directly as fj

89. For a good conductor, the depth of penetration of EM waves equals1
A. Ihrf24.2a
B. 7.Fria"
C. Ihrf24.2a
D. 1.17-70*

90. Frequencies in the UHF range propagate by means of
A. sky waves
B. surface waves
C. ionospheric scatter
D. space wave

91. In faraday rotation, the polarization phenomenon
A. does not exist
B. is noreciprocal
C. exists along the perpendicular direction
D. exists along the axis of the array

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