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Q.1
A waveguide operated below cut off frequency can be used as
Phase shifter
An attenuator
An isolator
None
Q.2
The wave in wave guide has
Group velocity inversely proportional to wavelength
Larger frequency than in the free space
Diminishing wavelength than in the free space
Larger wavelength than in the free space
Q.3
MUF is depend upon
Electron density of the ionospheric layer
11 year sun spot cycle
Received frequency by receiver
Height of ionospheric layer
Q.4
The radiation pattern of loop antenna is
Circle
Semicircle
Elliptical
Cardoid or Limacon
Q.5
A square corner reflector is used in
Radio astronomy
Tv broadcast
Point to point communication
All of the above
Q.6
In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include
Antenna replacement and feed correction
Amplitude timing and phase correction
Polarization shifting and code diversity
Path diversity and frequency diversity
Q.7
Radiation intensity in a given direction is the
Energy radiated per square metre
Power radiated per square metre
Power radiated per unit solid angle in that direction
None of the above
Q.8
Which of the following impedance inversion is obtained?
Short-circuited stub
A quarter wave line
Balun transformer
A half wave line
Q.9
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
Dust particles may not accumulate
Charge per unit area becomes very high for lightening to discharge
Rain drops may not collect
None of the above
Q.10
The useful magnetic flux obtainable from any closed surface is
Unity
Constant
Both A and B
None of the above
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
Transmission efficiency
Front to back ratio
Loss coefficient
None of the above
Q.12
The frequency range for satellite communication is
3 to 30 kHz
300 to 3000 kHz
3000 to 30000 MHz
30000 to 300000 MHz
Q.13
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
The value of current
The weight of the conductor
The direction of the conductor
None of the above
Q.14
If a and b are the dimensions of waveguide then
a = 3b
a = 2b
a = b
a = b/4
Q.15
The power gain of a half-wave dipole with respect to an isotropic radiator is
2.15 db
3 db
4.15 db
6 db
Q.16
MUF is highest in periods of greatest sunspot activity.
True
False
Q.17
The attenuation in waveguide above to cut off frequency
Very high
Very low
Zero
Infinite
Q.18
The radiation pattern of a parabola antenna is
Omnidirectional
A figure of directional
Highly directional
None of the above
Q.19
The virtual height of an ionospheric layer is __________ true height
Equal to
Less than
Higher than
No relation
Q.20
The transmitting antennas for lower frequencies (below 500 kHz) are generally
Vertical grounded wire type
Horizontal suspended wire type
Parabolic reflector type
Any of the above
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