Rejinpaul.com Provides Important Questions for all departments every year. QUESTION PAPER SOLUTION Unit- 1: Antenna Basics 1. What are the factors that affect the propagation of radio waves.? Antennas. It is made up of direct wave and ground reflected wave. End fire array c. Collinear array. A half wave antenna is the fundamental radio antenna of metal rod or tubing or thin wire which has a physical length of half wavelength in free space at the frequency of operation, 65.What is the radiation resistance of a half wave dipole, The radiation resistance of a half wave dipole is given by Rr=73 ohm, A loop antenna is a radiating coil of any convenient cross-section of one or more turns carrying radio frequency current.it may assume any shape (e.g. Eg. Tapering of array is a technique used for reduction of unwanted side lobes .The amplitude of currents in the linear array source is non- uniform; hence the central source radiates more energy than the ends. Wave that is guided along the earth’ s surface like an EM wave is guided by a transmission is called surface wave. Radiation pattern is the relative distribution of radiated power as a function of distance in space .It is a graph which shows the variation in actual field strength of the EM wave at all points which are at equal distance from the antenna. ii) For certain applications, it is highly desirable that secondary lobes should be eliminated completely or reduced to minimum desirable level compared to main lobes. Advantage: ._No minor lobes Disadvantages: ._Increased beam width ._Maintaining the large ratio of current amplitude in large arrays is difficult. What is the principle of the pattern multiplication? 47.What are the advantages of binomial array? ANTENNA & WAVE PROPAGATION (2 marks question and answer) 1) What is magnetic vector potential? A short dipole is initially in neutral condition and the moment a current starts to flow in one direction,one half of the dipole require an excess of charge and the other a deficit because a current is a flow of electrical charge.Then ,there will be a voltage between the two halves of the dipole.When the current changes its direction this charge unbalance will cause oscillations.Hence an oscillating current will result in an oscillating voltage.Since,in such dipole,electric charge oscillates ,it may be called as Oscilllating electric dipole. antenna and wave propagation questions with answers multiple choice questions antennas and wave propagation. 4.Gives notes on the antenna impedances. D = 4p / WA. Download link is provided 29.i)What is folded dipole antenna ? Answer : Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave (i.e. Maxwell Equations. Space diversity reception. Dr.V.Thrimurthulu Lecture Notes Antenna & Wave Propagation CREC Dept. Plane earth reflection. GATE. A … It is defined the angle between the first nulls (or) it is defined as twice the angle between the first null and the major lobe maximum direction. Find the effective aperture and Directivity of a short dipole antenna. The wave length of an electromagnetic wave depends on its velocity. Broad side array. To minimize the fading and to avoid the multi path interference the technique used are diversity reception. Two types. They are Elliptical polarization ,circular polarization and linear polarization. You can view Result with Detail Solution of each question after completion of the test. 70.What are Electrically Small loop antennas? 89. _It is used as probes for field measurements and as directional antennas for radio wave navigation . Derive the expression for Permitivity and conductivity of ionized gas.? Broad side array is defined as an arrangement in which the principal direction of radiation is perpendicular to the array axis and also the plane containing the array element. Year Percentage of Marks Overall Percentage 2015 8.70 8.862% 2014 8.25 2013 5.00 2012 12.00 2011 9.00 84. A NOVEL ANALYSIS OF TERAHERTZ WAVEFORMS STRUCTURES WITH GaAlAs BASED ALLOY SUBSTRATE, IJSTE - International Journal of Science Technology and Engineering, Design of a High Directive Gain Reconfigurable Circular Patch Antenna, Design and Analysis of Rectangular Microstrip Patch Antenna Using Inset Feed Technique for Wireless Application. PART 1: MCQ from Number 1 – 50 Answer key: PART 1. 10 Km from Earth surface). iii. Explain in detail ionospheric propagation. The current having both magnitude and direction. (AR). Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. Explain in detail about ionosphere propagation. The radiation resistance of a loop antenna can be increased by: 2. inserting a ferrite core of very high permeability with loop antenna’ s circumference which will rise the magnetic field intensity called ferrite loop. 35. Gain 3. 4. Question 69. _It is on many othe probes of planets and comets,including moon and mars,being used alone,in arrays or as feeds for parabolic reflectors,its circular polarization and high gain and simplicity making it effective for space application. A. SONAR … Basics of Propagation in Dielectric Waveguide and Optical Fibers. Antenna And Wave Propagation Question And Answers Unit 8 have look hundreds times for their chosen novels like this antenna and wave propagation question and answers unit 8, but end up in harmful downloads. Derive the expression for Permitivity and conductivity of ionized gas. Transmission Lines. Derive the expression for the radiated field from a short dipole. ._Isotropic source is not physically realizable but non-isotropic source is physically realizable. MCQ quiz on Antenna and Wave Propagation multiple choice questions and answers on antenna and wave propagation MCQ questions quiz on antenna and wave propagation objectives questions with answer test pdf. antenna and wave propagation two marks question and. PART 3: MCQ from Number 101 – 150 Answer key: PART 3. iii. The test carries questions on Uniform plane waves, Ground wave propagation, Ionospheric propagation, Introduction of antenna, Antenna parameters, Radiation integrals, Dipoles, Loop antenna, Antenna … 28.What is meant by uniform linear array.? JNTUK B.Tech AWP, Question papers, Answers, important QuestionANTENNAS AND WAVE PROPAGATION R13 Regulation B.Tech JNTUK-kakinada Old question papers previous question papers download Normally the electric field E is perpendicular to the direction of wave propagation. 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