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Electromagnetic Field Theory
Quiz 2
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Q.1
The critical frequency of ‘F’ layer is greater than 30 MHz.
True
False
Q.2
In a perfect conductor the incident and reflected wave combine to produce
A stronger incident wave
A stronger reflected wave
A standing wave which is not progressing
None of the above
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.
Yes
No
Q.4
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
Scattering
Polarisation
Absorption
Dispersion
Q.5
A satellite that simply reflect back the signals from one region of the earth to the other region is known as
Orbiting satellite
Geostationary satellite
Active satellite
Passive satellite
Q.6
The static electric field in a conductor is
Zero
Unity
Infinity
None of the above
Q.7
The skip distance is the maximum distance upto which ionospheric reflection is possible.
True
False
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 __________ .
Reflection
Refraction
Transmission
None of the above
Q.9
Tropospheric scatter propagation is not subject to any fading.
True
False
Q.10
Which of the following will increase the antenna radiation efficiency?
Use of larger section of conductor
Providing insulation on conductor
Top loading of antenna
Any of the above
Q.11
According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when
The impedance of one of the networks is half that of the other
The impedance of one is the complex conjugate of the other
The impedance of one is equal to that of the other
None of the above
Q.12
Which of the following statement regarding waveguides is incorrect?
At waveguide can be coupled to a coaxial cable
At frequencies below the cut off value the wave progresses across the waveguide after total reflections
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
Waveguides can handle large power at UHF and microwaves
Q.13
It is best to use for coupling a coaxial line to a parallel wire transmission line.
Directional Coupler
Balun
Slotted line
Tee
Q.14
In H-plane metal plate lens the travelling wave front is
Totally retarded
Retarded
Accelerated
Neither accelerated nor retarded
Q.15
The main disadvantage of the two-hole directional coupler is
Poor directivity
Narrow bandwidth
High standing wave ratio
Low directional coupling
Q.16
Parabolic and lens antenna used at
Microwave frequency
Medium frequency
Low frequency
High frequency
Q.17
A square corner reflector is used in which of the following?
TV broadcast
Point-to-point communication
Radio astronomy
All of the above
Q.18
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to
Decrease in the value of reactance
An increase in the value of reactance
No change in the reactance value
No change in the impedance value
Q.19
In case of surface waves the field strength at a point is directly proportional to
Antenna height
Wave frequency
Current of the antenna
Distance of the point from the antenna
Q.20
A rectangular waveguide is a
Rectangular conducting wire to propagate electromagnetic waves
Hollow rectangular walled room carrying electromagnetic wave
Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed
Tube antenna to transmit and receive electromagnetic waves
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