Q.1
The critical frequency of ‘F’ layer is greater than 30 MHz.
Q.2
In a perfect conductor the incident and reflected wave combine to produce
Q.3
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.
Q.4
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
Q.5
A satellite that simply reflect back the signals from one region of the earth to the other region is known as
Q.6
The static electric field in a conductor is
Q.7
The skip distance is the maximum distance upto which ionospheric reflection is possible.
Q.8
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
Q.9
Tropospheric scatter propagation is not subject to any fading.
Q.10
Which of the following will increase the antenna radiation efficiency?
Q.11
According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when
Q.12
Which of the following statement regarding waveguides is incorrect?
Q.13
It is best to use for coupling a coaxial line to a parallel wire transmission line.
Q.14
In H-plane metal plate lens the travelling wave front is
Q.15
The main disadvantage of the two-hole directional coupler is
Q.16
Parabolic and lens antenna used at
Q.17
A square corner reflector is used in which of the following?
Q.18
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to
Q.19
In case of surface waves the field strength at a point is directly proportional to
Q.20
A rectangular waveguide is a
0 h : 0 m : 1 s