What is broadside array? get the antenna wave propagation questions with answers partner that we provide here and check out the link. T e c h . 3. RADAR SYSTEMS Questions and Answers pdf :-UNIT I :-1. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. Explain the different types of polarization in detail. 25. ii. Derive the expression for radiation resistance of loop antenna with circumference equal to wavelength. Attenuation of this wave is directly affected by the constant of earth along which it travels. The efficiency of an antenna is defined as the ratio of power radiated to the total input power supplied to the antenna. Derive the expression for power radiated by a current element and its radiation resistance. 21.Explain the concept of Reflection and refraction wavesby the ionosphere. Two types. The effective height h of an antenna is the parameter related to the aperture.It may be defined as the ratio of the induced voltage to the incident field.i.e H= V / E. The fields around an antenna may be divided into two principal regions. 52.How radiations are created from a short Dipole? Computer Networks MCQ Questions and Answers with PDF Download is offered here so that you can prepare your exams better and score good marks for this chapter. 54.What is a Infinitesimal Dipole? If an e.m.f is applied to the terminals of an antenna no.1 and the current measured at the terminals of the another antenna no.2, then an equal current both in amplitude and phase will be obtained at the terminal of the antenna no.1 if the same emf is applied to the terminals of antenna no.2. Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave. When the length of the short dipole is vanishingly small,then such a dipole is called a infinitesimal dipole.If dl be the infinitesimally small length and I be the current,then Idl is called as the current element. Antenna and Wave Propagation Question and Answer 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? 37. CONDITIONS: Given this lesson material, pencil, paper and without supervision. 91. Find the effective aperture and Directivity of a short dipole antenna. 85. The polarization of the radio wave can be defined by direction in which the electric vector E is aligned during the passage of atleast one full cycle.Also polarization can also be defined the physical orientation of the radiated electromagnetic waves in space.The polarization are three types. Space wave ii. EM wave Acoustic wave TEM wave TE 10 wave 3. 30. Loss aperture. ii) With neat sketch explain the operation of Helical antenna. ... 21. 1 cm – 10 cm c. 10 cm – 1 m d. 0.1 cm – 1 cm ANSWER: 1 cm – 10 cm 2) Which among the following is an application of high frequency? What is the principle of the pattern multiplication? B. Broad side array. It is made up of direct wave and ground reflected wave. Effective aperture(Ae). Visit Wisdom jobs to look into the various Antenna jobs available along with the training and assessment material for improving your knowledge base and sample resumes for a winning job and Antenna interview questions. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. 53.Why a short dipole is also called an elemental dipole? The need for a binomial array is i). Multi path fading. Normal mode of operation 2. It is used in normally in microwave links, and it is found that signal transmitted over the same path in two polarizations have independent fading patterns.in broad band dish antenna system, Polarization diversity combined with frequency diversity reception achieve excellent results. In uniform linear array as the array length is increased to increase the directivity, the secondary lobes also occurs. This is the Multiples Choice Questions Part 1 of the Series in Antennas as one of the Communications Engineering topic. ANTENNAS AND WAVE PROPAGATION 2015 MULTIPLE CHOICE QUESTIONS UNIT-1: ANTENNA BASICS 1. 2. It states that the vector product of electric field intensity vector E and the magnetic filed intensity vector H at any point is a measure of the rate of energy flow per unit area at that point.The direction of power flow is perpendicular to both the electric field and magnetic field components. 19. Eg. The ratio of the main beam area to the total beam area is called beam efficiency. It is defined as the ratio of the power radiated in desired direction to the power radiated in the opposite direction. Impedance 4. ii). ._Many satellites including weather satellites,data relay satellites all have helical antennas . 2. Derive the expression for Permitivity and conductivity of ionized gas.? 84. Graphical representation of the radial component of the pointing vector Sr at a constant radius as a function of angle is called power density pattern or power pattern. Antenna asics Multiple hoice Test Student’s name: Total points: 1. The ratio of maximum radiation intensity in given direction to the maximum radiation intensity from a reference antenna produced in the same direction with same input power. In this array the elements are fed parasitically to reduce the problem of feed line. Antenna and Wave Propagation Trivia Questions and Answers PDF. 10.Explain the different techniques used for tapering of arrays. 5.Define Polarization? D = P(q,f)max / P(q,f)av. Multiple Choice Questions and Answers on Antenna & Wave Propagation 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? The parameters to be considered for the design of an helical antenna are: 1. Antenna And Wave Propagation Questions With Answers File Type PDF Antenna And Wave Propagation Questions … Antenna asics Multiple hoice Test - ETH Z Antenna asics Multiple hoice Test Student’s name: Total points: 1 The propagation speed of an EM wave depends on the Medium Frequency Polarization Power 2 Which of Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Wave that is guided along the earth’ s surface like an EM wave is guided by a transmission is called surface wave. What are the factors that affect the propagation of radio waves.? 2 III Year – I SEMESTER T P C 3+1 0 3 ANTENNAS AND WAVE PROPAGATION OBJECTIVES UNIT I ANTENNA FUNDAMENTALS: Introduction, Radiation Mechanism –single wire, 2 wire, dipoles, Current Distribution on a thin wire antenna.Antenna Parameters - Radiation Patterns, Subscribe via Email, to get the latest articles [updates] from this site. The applications of helical antenna are: . 41. Explain about the frequencies used for radar 5. TQ, visit us again. The total field pattern of an array of non isotropic but similar sources is the product of the i) individual source pattern and ii) The array pattern of isotropic point sources each located at the phase center of the individual source having the same amplitude and phase. Similar point sources with equal maximum amplitudes are called identical point sources. Find dipole length and radiated power. The radiation field will be produced at a larger distance from the the current element ,where the distance from the centre of the dipole to the particular point is very large.It is also called as distant field or far field. You have remained in right site to begin getting this info. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF. 88 .Define frequency diversity Reception. Thus WA = WM+ Wm . D = 4p / WA. It is defined as the fictitious resistance which when inserted in series with the antenna will consume the same amount of power as it is actually radiated.The antenna appears to the transmission line as a resistive component and this is known as the radiation resistance. 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. The phenomenon of splitting the wave into two different components (ordinary and extra-ordinary) by the earths magnetic field is called Magneto-Ions Splitting. i.e Maximum radiation intensity from test antenna Gain (G) = --------------------------------------------------------, ----------------------- Maximum radiation intensity from the reference antenna with same input power. However, their powe… ii) Explain the term pattern multiplication. This aperture is a measure of the physical size of the antenna. 6.Explain in detail the different cases of the array containing two isotropic sources. * Ask us, what you want? … Plane earth reflection. What is meant by similar Point sources.? Multiple Choice Questions and Answers on Antenna & Wave Propagation Multiple Choice Questions and Answers By Sasmita January 14, 2017 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? 22. iii. 56.What do you understand by retarded current? Visit our Antenna job interview questions and answers page designed by our experts … Page 5 MULTIPLE CHOICE QUESTIONS UNIT-3: ANTENNA ARRAYS 1. Ans:The dipole has two equal charges of opposite sign oscillating up and down in a harmonic motion.The charges will move towards each other and electric filed lines were created.When the charges meet at the midpoint, the field lines cut each other and new field are created.This process is spontaneous and so more fields are created around the antenna.This is how radiations are obtained from a short dipole. While the total phase pattern is the sum of the phase patterns of the individual source pattern and array pattern.0, 44.What is the advantage of pattern multiplication? MCQ in Radiation and Wave Propagation Part 1 as part of the Communications Engineering (EST) Board Exam. * To get Clear; figures / diagrams, tables / values, answers / explanations and more, download the Antennas and Wave Propagation Viva Short Questions and Answers PDF. ._Isotropic source is not physically realizable but non-isotropic source is physically realizable. ._It is used as receiving antenna in portable radio and pagers . Read PDF Antenna Wave Propagation Questions With Answers Recognizing the way ways to acquire this books antenna wave propagation questions with answers is additionally useful. 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. 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. rectangular,square,triangular and hexagonal), 67.Give an expression of radiation resistance of a small loop Radiation resistance of a small loop is given by Rr=31,200 (A/_ 2)2, 68.How to increase the radiation resistance of a loop antenna. 23. Variation of signal strength occur on line of sight paths as a result of the atmospheric conditions and it is called .It can not be predicted properly. Wave propagation is any of the ways in which waves travel. 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. What is meant by identical Point sources.? List the arrays used for array tapering . wave velocity vp = c / ¥__- (fc / f)2 Group velocity, vp vg = c2 vg = c2 / vp. 76.List the applications of helical antenna. A dipole antenna may be defined as a symmetrical antenna in which the two ends are at equal potential relative to the midpoint. Discuss the design aspects. Write short notes on i) Ground wave propagation ii) space wave propagation. EmoticonEmoticon. 39.What is the need for the Binomial array.? Lecture 4 - Practical Machine Learning 1.pptx, Malaviya National Institute of Technology, Jaipur, ECE-VI-ANTENNAS AND PROPAGATION [10EC64]-NOTES, MCQ in Electronics - Wave Propagation And Antenna, Malaviya National Institute of Technology, Jaipur • CSE 306, Visvesvaraya Technological University • ELECTRICAL NA, Sri Sivani College of Engineering • CSE 509, University of Pangasinan • ECE 111005619. b) Non-Linear. Antennas convert -to-a) Ground wave classified into two types. 59.At what distance from the dipole is the induction field equal to the radiation field? An antenna is an electrical conductor or system of conductors. End fire array is defined as an arrangement in which the principal direction of radiation is coincides with the array axis. Find the radiated power of an antenna if 10 Amp current exists and its radiation resistance 32 ohm. This method takes advantage of the fact that signals of slightly different frequencies do not fade synchronously. Axial Ratio, 74.What are the types of radiation modes of operation for an helical antenna The two types of radiation modes of operation possible for an helical antenna are: 1. Antenna beam width is an angular width in degrees, measured on the radiation pattern (major lobe) between points where the radiated power has fallen to half its maximum value .This is called as “beam width” between half power points or half power beam width.(HPBW). Relation between and Skip Distance, Multi-hop Propagation. a. Sky wave. An array is linear when the elements of the array are spaced equally along the straight line. Find the maximum effective area of an antenna at 2GHz when the directivity is 100. 7. 73.What are the parameters to be considered for the design of an helical antenna? For a charge moving with uniform velocity with straight & infinite wire, ANSWER: For a charge oscillating in time motion. 4. 1 cm – 10 cm c. 10 cm – 1 m d. 0.1 cm – For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! 47.What are the advantages of binomial array? a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus … Then It is -----array. Antenna and Wave Propagation multiple choice questions and ... An antenna is an electrical conductor or system of conductors. Write the potential function in different form. Axial mode of operation. The antenna is a radiating device in which power is radiated into space in the form of electromagnetic wave. Derive the expression for refractive index of ionosphere and critical frequency. c) Both a and b. It is the addition of above three apertures. The maximum amplitudes of the individual sources may be unequal. Polarization diversity. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. Space diversity reception. Electrically Large loop antennas is one in which the overall length of the loop approaches the wavelength. Interference of normal radiation & radio wave propagation, If the path difference of two waves with single source traveling by different paths to, arrive at the same point, is λ/2, what would be the phase difference between, Which ionization layer exists during day time & usually vanishes at night due to highest, What is the possible range of height for the occurrence of sporadic E-region with, layer of appleton region acts as a significant reflecting medium for, The knowledge of which parameter is sufficient for deriving the time varying, According to Webster’s dictionary, what is an. iii) Loss aperture. Antenna Wave Propagation Questions With Answers related files: 87244389a5b844c4a277fb9944d1a6da Powered by TCPDF (www.tcpdf.org) 1 / 1 i. Curvature of earth. 40. 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 is a transition device or a transducer between a guided wave and a free space waveor vice versa. At low frequencies, the waves can pass through obstacles easily. i. Electrically Small loop antennas have small radiation resistances that are usually smaller than their loop resistances.They are very poor radiators and seldom employed for transmission in radio communication. 26. , M I S T E . • E and H oscillate in phase and ratio of their amplitudes is constant and is equal to: i. Explain in detail about the aperture Concept, 3.Briefly explain the radiation from a short dipole. 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. It is the waves originate at a fictitious volumeless emitter source at the center ‘O’ of the observation circle. Antennas and Wave Propagation is written for the first course on the same. It is the area over which the power is extrated from the incident wave and delivered to the load is called effective aperture. Derive the expression for radiation resistance of small loop antenna. Antenna and wave Propagation, AWP Questions For placement and exam preparations, MCQs, Mock tests, Engineering Class handwritten notes, exam notes, previous year questions, PDF free download LectureNotes.in works best with JavaScript, Update your browser or enable Javascript Which among the following is/are not present in free space? Following is the list of multiple choice questions in this brand new series: MCQ in Radiation and Wave Propagation . What is inverse and multi path fading.? Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. (Ae). Multi path fading is caused by interference between the direct and ground reflected waves as well as interference between two are more paths in the atmosphere. 100. Give the design equations. The ratio of the major to the minor axes of the polarization ellipse is called the Axial Ratio. The energy radiated in a particular direction by an antenna is measured in terms of FIELD STRENGTH. Yagi uda antenna. Electrically Small loop antennas is one in which the overall length of the loop is less than one-tenth of the wavelength. Professionals, Teachers, Students and Kids Trivia Quizzes to … 29.i)What is folded dipole antenna ? 43. Give it a try and share your score. 32. When these modes re-emerge from the ionosphere they recombine into a single plane wave again. b. Introducing Textbook Solutions. 13.Derive the field radiated from a small loop antenna, 14.Explain in detail about the helical antenna, 15.Explain the different modes of operation of helical antenna. [ ] a) Linear. How wideband operation is possible with this antenna. • V elocity of propagation of a wave in free space is giv en by 3 × 10 8 m/s. i.e FBR = Power radiated in desired direction / power radiated in the opposite direction. This fact is utilized to minimize fading in radio telegraph circuits. It operates in 100MHz. The effective radiated power ii. 70.What are Electrically Small loop antennas? Tapering is done from center to end. Finally the plane of polarization will usually have changed, this phenomenon is known as Faraday’ s rotation. View awp-bitbank-pdf.docx from CSE 304 at National Institute of Technology, Warangal. Far field zone (Fraunhofer zone). Medium Frequency Polarization Power 2. Eg. 4.Gives notes on the antenna impedances. It is obtained by two ways. 50. The radiation intensity is independent of distance. Absorption character of ionosphere for the paths between transmitter and receiver. 49.Define Side Lobe Ratio Side Lobe Ratio is defined as the ratio of power density in the principal or main lobe to the power density of the longest minor lobe. Derive the expression for the radiated field from a short dipole. The total beam area ( WA) consists of the main beam area ( WM ) plus the minor lobe area ( Wm) . Explain in detail about ionosphere propagation. It is also called as isotropic source or omni directional radiator or simply unipole. AWP QUES1.pdf - Multiple Choice Questions and Answers on Antenna Wave Propagation 1 What is the wavelength of Super high frequency(SHF especially used, Multiple Choice Questions and Answers on Antenna & Wave Propagation, What is the wavelength of Super high frequency (SHF) especially used in Radar &. Waves that arrive at the receiver after reflection in the ionosphere is called sky wave. The lowest useful HF for a given distance and transmitter power is defined as the lowest frequency that will give satisfactory reception for that distance and power. Scattering aperture. ._, Useful tool in designing antenna ._It approximates the pattern of a complicated array without making lengthy computations. R A V E E N D R A M . ii) Specify the design consideration for a rhombic antenna. The presence of near by antenna no.2 induces a current in the antenna no.1 indicates that presence of antenna no.2 changes the impedance of the antenna no.1.This effect is called mutual coupling and results in mutual impedance. In retarded potentials, what factor of time delay is generally introduced in A & V equations? The dipole is the correct one well capable of taking up the quiz below with.! For telephone, television and data, being employed both on satellites and at stations... 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