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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 11
41.
The effective height of a vertical radiator can be increased by
loading with lumped inductance
supporting on an insulator
capacitive loading
giving input more power
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
When an electromagnetic wave travelling in one medium strikes upon a second medium (having a different conductivity) the wave will be
totally transmitted
totally reflected
neither transmitted nor reflected
partially transmitted and partially reflected
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
For transmission of waveform a dielectric medium of permittivity ε1 into a dielectric medium of lower permittivity ε2 , (ε1 > ε2) the critical angle of incidence θc (relative to the interface) is given by
sin-1
cos-1
tan-1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
The line of sight communication requires that transmit and receive antennas to face each other. If the transmit antenna is vertically polarized, for the best reception the receive antenna should be
horizontally polarized
vertically polarized
at 45° with respect to horizontal polarization
at 45° with respect to vertical polarization
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
An antenna has 40 Ω resistance and 60 Ω radiation resistance. The efficiency of the antenna is
30%
40%
50%
60%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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