71801. The radiation resistance of a rod tubing antenna is
71802. Power gain of an antenna in a given direction is the ratio of
71803. The secondary lobes in binomial arrays can be reduced by
71804. ------is a process-to-process protocol that adds only port addresses,checksum,error control and length information to the data from the upper layer:
71805. The maximum effective aperture of a microwave antenna which has a directivity of 900, will be
71806. For a wave propagating in air filled rectangular waveguide.
71807. Which of following antenna produces elliptical polarisation?
71808. End fire coupler is formed
71809. Antenna radiation efficiency can be increased by
71810. Divergence of curl A is
71811. If reflection coefficient is 1/5, then corresponding VSWR is given by
71812. The characteristic impedance is given by
71813. Surface integral of the electric field intensity is
71814. The essential condition for antenna array to be linear is that
71815. Directivity gain depends on
71816. The fluctuation in the received signal strength at the receiver of a random variation in the received signal is known as
71817. For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be
71818. The phase velocity in a transmission line is
71819. Which of the antenna is best excited by a waveguide?
71820. An end fire array consisting of several half-wave lengths of directive gain 40, then array length will be
71821. Loop antennas are mostly employed for direction finding (DF) purposes because they are small and hence portable.
71822. The troposphere extends from earth surface to a height of
71823. Antenna reciprocity is put to use in
71824. For satellite communication, the frequency should be
71825. The velocity of electromagnetic wave in free space is given by
71826. When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called
71827. A hertzian dipole has a radiation pattern with
71828. Circular polarized waves result when
71829. Permeance is analogue to
71830. Skip distance (D) is
71831. A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used as
71832. 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
71833. A parabolic antenna produces a radiation pattern which is
71834. Considerable ionization occurs between the range
71835. Gain of isotropic antenna is
71836. Antenna is a __________ element
71837. Laplacian of a scalar function v is
71838. The numerical value of directive gain may lie between
71839. The wave propagation occurs without attenuation in case of a
71840. The RSA algorithm uses a ---------cryptography method
71841. 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
71842. The phase velocity in a coaxial line is
71843. D-layer extends approximately from
71844. The ionosphere plays a significant role in radio wave propagation at
71845. Radiation resistance for wire antenna is
71846. After reflection from a plane conducting surface, the apparent velocity of electromagnetic wave becomes greater than the velocity of light in free space is called
71847. In a turnstile antenna the crossed dipoles are excited with voltages
71848. Directivity of antenna is defined as
71849. Consider the following; for a loss-less transmission line we can write, Zin = - jz0 for a shorted line with l = λ/8Zin = ± j ∞ for a shorted line with l = λ/4Zin= jz0 for an open line with l = λ/2Zin = 0 for a matched line of any length Select the correct answer using the codes given below codes.
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