Q. A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m³ . The phase velocity vp (assuming velocity of light as 3 x 10⁸ m/sec) is

View solution

Q. The phase velocity in a coaxial line is

View solution

Q. D-layer extends approximately from

View solution

Q. The ionosphere plays a significant role in radio wave propagation at

View solution

Q. Radiation resistance for wire antenna is

View solution

Q. When a coil consisting of single turn rotates at a uniform speed in a magnetic field, the induced e.m.f. is

View solution

Q. Short-circuited stubs are used, because open-circuited stubs are

View solution

Q. Directivity and beamwidth is related as

View solution

Q. An arrangement of several individual antennas to spaced and phased that their individual contributions combine in one preferred direction and cancel in all other directions, to get greater directive gain or directivity, is known as

View solution

Q. A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used as

View solution

Q. A rectangular waveguide (2.29 x 1.02) cm operates at a freq. of 11 GHz in TE₁₀ mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be

View solution

Q. A parabolic antenna produces a radiation pattern which is

View solution

Q. Considerable ionization occurs between the range

View solution

Q. Gain of isotropic antenna is

View solution

Q. Antenna is a __________ element

View solution

Q. Laplacian of a scalar function v is

View solution

Q. The numerical value of directive gain may lie between

View solution

Q. The wave propagation occurs without attenuation in case of a

View solution

Q. When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called

View solution

Q. A hertzian dipole has a radiation pattern with

View solution