Q. Which type of fading causes serious distortion of modulated signal?

View solution

Q. Which of the following is abnormal variation in ionosphere?

View solution

Q. Troposphere is the upper part of the Earth's atmosphere which absorbs large quantities of Sun's radiations.

View solution

Q. For resonant long wire antenna 'n' half wavelength long in free space, if 'n' is increased then inclination of the major lobe with wire axis will __________ .

View solution

Q. The maximum effective aperture of λ/2 (half-wave) antenna is

View solution

Q. Microwave signals follow the curvature of the earth and the phenomenon is known as

View solution

Q. In a carbon-zinc cell the function of the depolarizer is that

View solution

Q. Induction and radiation fields are equal at a distance equal to

View solution

Q. The effective height of an antenna is slightly greater than physical height because

View solution

Q. A long periodic antenna is a

View solution

Q. The wave in wave guide has

View solution

Q. While determining antenna height for terrestrial microwaves links, the effect of refraction from the atmosphere is taken care of by considering the effective curvature of the earth to be

View solution

Q. A T.V. station works at 300 MHz and radiates 100 kW of power. This signal received at a distance of 200 km will be

View solution

Q. The power gain of a half-wave dipole with respect to an isotropic radiator is

View solution

Q. In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

View solution

Q. The relative permittivity of the ionosphere at ratio frequencies is

View solution

Q. Tropospheric scatter propagation is not subject to any fading.

View solution

Q. The attenuation in waveguide above to cut off frequency

View solution

Q. When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

View solution

Q. Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

View solution