Q.1
A waveguide operated below cut off frequency can be used as
Q.2
The wave in wave guide has
Q.3
MUF is depend upon
Q.4
The radiation pattern of loop antenna is
Q.5
A square corner reflector is used in
Q.6
In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include
Q.7
Radiation intensity in a given direction is the
Q.8
Which of the following impedance inversion is obtained?
Q.9
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
Q.10
The useful magnetic flux obtainable from any closed surface is
Q.11
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as
Q.12
The frequency range for satellite communication is
Q.13
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
Q.14
If a and b are the dimensions of waveguide then
Q.15
The power gain of a half-wave dipole with respect to an isotropic radiator is
Q.16
MUF is highest in periods of greatest sunspot activity.
Q.17
The attenuation in waveguide above to cut off frequency
Q.18
The radiation pattern of a parabola antenna is
Q.19
The virtual height of an ionospheric layer is __________ true height
Q.20
The transmitting antennas for lower frequencies (below 500 kHz) are generally
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