71701. An electromagnetic wave is incident normally on a dielectric boundary. It is
71702. According to maximum power transfer theorem, if the load is inductive, the source should be
71703. According to Siegel and Labus, antenna can be treated as
71704. Given figure shows a 90° sector of spherical reflector with vertex 'V', centre of curvature 'C' and equal distances VD, DF, FE and EC. When a beam of EM wave is incident parallel to the axis, all the energy will pass through the region
71705. The value of susceptibility in case of vacuum is taken as
71706. Self impedance is
71707. Equipotential surfaces about a point charge are in which one of the following forms?
71708. __________ will have the least value of relative permeability.
71709. The relative permeability is taken as unity for which of the following?
71710. The disturbance from adjacent power lines is known as
71711. Magnesium is alloyed with conducting materials for antenna primarily with the purpose of
71712. Which of the following term applies to troposcatter propagation?
71713. The effective refraction index of the ionosphere for radio wave is
71714. For space propagation, what will be the electric field strength at receiving antenna
71715. A medium is said to be isotropic when
71716. The radiation resistance of a resonant long wire antenna of half wavelength (λ/2) is given
71717. A uniform wave have components
71718. The measure of mismatch between the load and the transmission line is known as
71719. Ionospheric storm causes an abnormal decrease in the critical frequency.
71720. Which of the following is best excited from a waveguide?
71721. In a vertical earthed antenna the base input impedance will be inductive for a height
71722. The frequencies in ultra high frequency range are propagated by means of __________ waves
71723. Maximum effective aperture of a antenna is
71724. Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure. Reflection coefficient is given by
71725. Which of the following wave remains unaffected during day and night?
71726. A microwave link uses only line-of-sight propagation.
71727. The phase velocity of an EM wave propagating in a hollow metallic rectangular waveguide in the TE10 mode is
71728. The electric field of an EM wave propagating in the z direction given by The wave is
71729. Which of the following waves do not exist in waveguides?
71730. The bidirectional pattern of a broadside array can be converted into unidirectional by
71731. VLF waves are used for communication system because
71732. Which one is correct option?
71733. A vertical loop antenna, like a horizontal dipole, is vertically polarised.
71734. The attenuation in a waveguide near the cut off frequency is
71735. The electric flux and field intensity inside a conducting sphere is
71736. T.V. antennas are usually
71737. Measurement of radiation resistance by reflection method is suitable for
71738. A lossless transmission line is connected to two identical voltage source as shown in figure. The impedance measured at the midpoint AA' is
71739. A loss less transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is
71740. A higher directivity is specified by
71741. The best excited reflector from a wave guide is
71742. Long distance short-wave radio broadcasting uses
71743. The affect of ground on radiation pattern is to
71744. If a electromagnetic signal is incident at 0° in a waveguide then at other port of waveguide we will get
71745. An antenna having a high Q has
71746. The polarization of dielectric materials results in
71747. For a quarter wave transformer, characteristic impedance is related with input and load impedances as
71748. An electron when placed midway between two equal and opposite charges will
71749. Which of the following is the abnormal phenomena observed in the ionosphere?
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