Terms, Definitions, MCQs and Free Templates
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Which one is correct?
The radiation pattern of loop antenna is
Directivity of antenna is defined as
For an ideal antenna, numerical value of directivity must be
Which of the antenna is best excited by a waveguide?
Self impedance is
Mutual impedance is not depend upon
In a metal, the drift velocity of electrons in the presence of a electric field E is
Radiation resistance for wire antenna is
The gain of an half wavelength antenna is
Gain of isotropic antenna is
1 dB is equal to __________ nepier
The refractive index of E layer, if angle of incidence is 30°
Bandwidth of an antenna is related with where Q is quality factor
Which of following antenna not produces circular polarisation?
Which of following antenna produces elliptical polarisation?
Maximum usable frequency is [fmuf]
Considerable ionization occurs between the range
Radar antennas are
T.V. antennas are usually
Dish antennas are
In cell phone antennas are
The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
Purpose of antenna is
Antenna is a __________ element
Which of the following antennas is λ /4 length?
Which of the following is λ/2 length?
In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is
In a rectangular waveguide ZTE . ZTM is
A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The reflection coefficient will be
A λ/8 section of transmission line is determined of load impedance of (2 – j 5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is
Whenever a wave is incident on a perfect conductor then the reflection coefficient is
A conductor carries 10 A current in + x direction and is lying in a field having a flux density 0.2 T directed along + z direction. The magnitude of force per metre length and direction are
Equipotential surfaces about a point charge are in which one of the following forms?
Which one of the following statement is correct?
A waveguide operated below cut off frequency can be used as
Unit of e is __________ .
ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter wave transformer should have a characteristic impedance of
For TE or TM modes of propagation in bounded media, the phase velocity is