71751. Which layer is least important in high frequency propagation?
71752. Which of the wave remains unaffected whether it is a day or night?
71753. Which of the following is not an omnidirectional antenna?
71754. The unit of magnetic flux density is
71755. In a waveguide if TE mode exist for z direction propagation, then
71756. Critical frequency of a layer in ionosphere
71757. Distances near the skip distance should be used for sky-wave propagation
71758. End fire array has a dipole spacing of λ/2.
71759. Which one of following is correct for broadside array?
71760. Curl of gradient A is
71761. What does the expression represent?
71762. A conductor is said to be perfect if it has __________ conductivity
71763. The simplest standing wave is due to the value of reflection co-efficient is
71764. In terrestrial microwave links, the number of 'fades' per unit increases as
71765. Bandwidth of an antenna is related with where Q is quality factor
71766. Select the correct relation
71767. Diffraction of electromagnetic wave
71768. Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is
71769. For a plane good conductor, skin depth varies
71770. When a plane wave travelling in free space is incident normally on a medium having εr = 4.0, then fraction of power transmitted into the medium is given by
71771. For broadside array, maxima will be obtain at
71772. Surface impedance at high frequencies is a consideration for
71773. The unit of displacement density is
71774. Dish antennas are
71775. When microwave signals follow the curvature of the earth, this is known as
71776. Characteristic wave impedance is
71777. The attenuation factor a and phase shift factor β for a wave propagated in a good dielectric having are given by
71778. Consider isotropic radiator radiating a power of 1 watt. At a distance of 1 metre, the power per unit area with equal
71779. Cassegrain feed is used with a parabolic reflection to
71780. Consider an arbitrary distribution of conducting bodies in a charge free space according to the uniqueness theorem, which of following are required to be specified in order that the field is uniquely determined everywhere? Total charge on each conductorPotential at each conductor surfacePotential at same of conductor and total charge on the remainderTotal charge as well as potential gradient on each conductor surface Select the correct answer using the codes given below codes
71781. Which of the following is a better propagation mode to propagate television frequency modulation and radar signals?
71782. Antenna used for T.V. broadcasting is
71783. For a rectangular waveguide (a x b, a > b) to support only the TE10 mode at wavelength which one of the following pairs of in equalities is to be satisfied?
71784. Transverse electric (TE) waves have
71785. For infinite value of SWR on a transmission line, the line be terminated with impedance as
71786. An electromagnetic wave incident on a perfect conductor is
71787. A time varying magnetic field produces
71788. An open coil has
71789. Antenna used for direction finding is
71790. In E plane metal plate lens antenna
71791. The disturbance from adjacent telephone line is known as
71792. The boundary conditions at the interface between two dielectrics in an electric field are given by
71793. The curve representing Ohm's law is
71794. When a plane wave is incident normally from dielectric '1' (μ0, ε1) onto dielectric '2' (μ0, ε2) the electric field of the transmitted wave is 2 times the electric field of the reflected wave. The ratio ε2/ε1 is
71795. The electric intensity for free space is given by
71796. Which of following antenna not produces circular polarisation?
71797. Purpose of antenna is
71798. MF is generally used for
71799. The attenuation in waveguides near the cut off frequency is
71800. The ground waves eventually disappear as one moves away from the transmitter because of
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