WorksheetsQuiz 4
Total questions: 12
Worksheet time: 6mins
______ is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
antenna
circuits
amplifier
mutliplier
Gain is lower than Directivity is due to ______
energy losses
Ohmic losses
scattering loss
lossless medium
Power density at any distance from an isotropic antenna is simply the transmitted power dived by the _______ at that distance.
area of square
area of rectangle
area of circle
area of sphere
An antenna source that radiates energy uniformly in all the directions is called
Isotropic source
Anisotropic source
Point source
None of the mentioned
The ratio of radiation intensity in a certain direction to average radiation intensity is:
Gain
Directivity
Radiatio Pattern
An antenna capable of radiating in all directions is called:
Omni-directional antenna
Bi-directional antenna
Directional antenna
Broadside
Antenna
Radiation resistance of a half-wave dipole is ______
73Ω
72Ω
71Ω
70Ω
The graphical representation of the radiation properties of the antenna as a function of space coordinates is called.
Radiation pattern
Radiation Intensity
Directivity
Resolution
What is the directivity of half-wave dipole?
1.44
1.43
1.5
1.64
Which of the following expression is correct for radiation efficiency?
ηr=Rl/Rr+Rl
ηr=Rr/Rr+Rl
ηr=Rr/Rr−Rl
ηr=Rr/Rl
For circular wave polarization to occur:
Two linearly polarized waves with equal magnitude and same phase
Two linearly polarized waves with unequal magnitude with 90 degrees phase shift
Two linearly polarized waves with equal magnitude with 90 degrees phase shift
Two linearly polarized waves with unequal magnitude and same phase
The antenna employed in TV receiver is
Half wave dipole
Yagi-Uda Antenna
Rhombic antenna
Horn antenna
