Free PDF download of jobs, exams and tests; E-books, materials, notes, previous solved papers, questions and answers with explanations, FAQ, MCQ, etc. 50. 27. i) State and Prove reciprocity theorem. The key features are − 1. 10.Explain the different techniques used for tapering of arrays. 43. Directivity from Pattern. ii) Explain the term pattern multiplication. Multiple Choice Questions ∇ × ∇ × E is ∇ ∇ .E −∇2 E ∇2 E − ∇ ∇ .E ∇2 .E + … - Selection from Antennas and Wave Propagation [Book] The ratio of the major to the minor axes of the polarization ellipse is called the Axial Ratio. i. 90. Write the potential function in different form. Page 5 MULTIPLE CHOICE QUESTIONS UNIT-3: ANTENNA ARRAYS 1. 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. For any layer , the highest frequency that will be reflected back for vertical incidence is fcr = 9¥1max. 42. Derive the expression for radiation resistance of small loop antenna. Define and explain for ionospheric region i) Critical frequency ii) MUF iii) Skip zone iv) virtual height of a layer. i.e Aperture efficiency = hap = Ae / Ap (dimensionless). (Ap). Write short note on i) Vector potential ii) modification potential iii) Retarded Potential. 52.How radiations are created from a short Dipole? 88 .Define frequency diversity Reception. What is meant by identical Point sources.? Course Hero is not sponsored or endorsed by any college or university. Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. You have remained in right site to begin getting this info. i) Effective aperture. iv. This is the Multiples Choice Questions Part 1 of the Series in Antennas as one of the Communications Engineering topic. Yagi uda antenna. 54.What is a Infinitesimal Dipole? d. Parasitic array. 1 m – 10 m b. 48.What is the difference between isotropic and nonisotropic source ._ Isotropic source radiates energy in all directions but non-isotropic source radiates energy only in some desired directions. Define wave velocity and Group velocity.? It depends on i. Then It is -----array. iii. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! Find dipole length and radiated power. 40. Plane earth reflection. STANDARDS: Demonstrate competency of the task skills and knowledge by correctly responding to 70 percent of the multiple choice test covering identification of the characteristics of wave propagation. D .Kraus Book). In retarded potentials, what factor of time delay is generally introduced in A & V equations? 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. iii) Loss aperture. An antenna's impedance relates the voltage to the current at the input to the antenna. RADAR SYSTEMS Questions and Answers pdf :-UNIT I :-1. 4. 16. A dipole antenna may be defined as a symmetrical antenna in which the two ends are at equal potential relative to the midpoint. 71.What are Electrically large loop antennas? Explain in detail about ionosphere propagation. 36. . Give it a try and share your score. Tower . 47.What are the advantages of binomial array? 86.What is meant by diversity reception.? Antennas and Wave Propagation is written for the first course on the same. MCQ in Radiation and Wave Propagation Part 1 as part of the Communications Engineering (EST) Board Exam. ... 21. It is the area of the antenna which dissipates power as heat. Derive the expression for power radiated by a current element and its radiation resistance. Letan antenna has an impedance of 50 ohms. b. Faraday rotation in Sky wave Propagation. 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. Impedance 4. Effective aperture(Ae). ii) Specify the design consideration for a rhombic antenna. Surface wave. 84. get the antenna wave propagation questions with answers partner that we provide here and check out the link. * To get Clear; figures / diagrams, tables / values, answers / explanations and more, download the Antennas and Wave Propagation Viva Short Questions and Answers PDF. Give it a try and share your score. In uniform linear array as the array length is increased to increase the directivity, the secondary lobes also occurs. Explain the different types of Diversity technique. ii) With neat sketch explain the operation of Helical antenna. In this array the elements are fed parasitically to reduce the problem of feed line. The exam of 100 Questions will be drawn from the Basic question bank (RIC-7). 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. 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. 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. Wave that is guided along the earth’ s surface like an EM wave is guided by a transmission is called surface wave. Derive the expression for radiation resistance of loop antenna with circumference equal to wavelength. 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. 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 &. The need for a binomial array is i). 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. (Ae). Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave. … 7. ._Isotropic source is not physically realizable but non-isotropic source is physically realizable. Draw the block diagram of a Pulsed radar and explain its operation 2. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Define gyro frequency. 33.i) Write a short note on Traveling wave 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 Waves propagated over other paths near the earth surface is called ground wave propagation. Page 2/9. 92. a. 39.What is the need for the Binomial array.? 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? 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, 35. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF. The energy radiated in a particular direction by an antenna is measured in terms of FIELD STRENGTH. What is broadside array? Give the design equations. Questions and Answers in Radiation and Wave Propagation Series. \34. Antenna and Wave Propagation multiple choice questions and ... An antenna is an electrical conductor or system of conductors. 38. Antenna and Wave Propagation Trivia Questions and Answers PDF. PDF | On Apr 2, 2013, mahendra Kumar published multiple choice questions on wireless communication | Find, read and cite all the research you need on ResearchGate In some situation the electric field E is parallel to the wave propagation that condition is called Cross field. _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. The required field strength which in turn depends upon the radio noise at the receiving location and type of service involved . 24. 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. 73.What are the parameters to be considered for the design of an helical antenna? 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. Beam efficiency = SM = WM / WA. Thus WA = WM+ Wm . 3. 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. , M I S T E . W’ = I2 R Rr = W’/ I2 Where Rr is a fictitious resistance called called as radiation resistance. 9.Explain the principle of pattern multiplication with some examples. Wave propagation is any of the ways in which waves travel. Physical aperture. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF The directivity of an antenna is equal to the ratio of the maximum power density P(q,f)max to its average value over a sphere as observed in the far field of an antenna. Bandwidth 2. Following is the list of multiple choice questions in this brand new series: MCQ in Radiation and Wave Propagation . This aperture is a measure of the physical size of the antenna. 31.i) Explain the construction of Yagi antenna. The ratio of the main beam area to the total beam area is called beam efficiency. Fundamental Concept 1.1 Introduction: An antenna (or aerial) is an electrical device which converts electric power into radio waves, and vice versa. EmoticonEmoticon. An array is linear when the elements of the array are spaced equally along the straight line. UNIT VIII Wave Propagation – II: Antenna and wave propagation pdf; Sky Wave Propagation — Introduction. Gain 3. Antenna is also said to be an impedance transforming device. 12.Derive the expressions for the fields and power radiated from a half wave dipole antenna.Find its radiation resistance and directivity. They are Elliptical polarization ,circular polarization and linear polarization. The parameters to be considered for the design of an helical antenna are: 1. Wave propagation is any of the ways in which waves travel. Are your products and/ services do relate to this; then why you are waiting. i.e FBR = Power radiated in desired direction / power radiated in the opposite direction. What is meant by Faraday’ s rotation.? Derive the maxima ,null directions and also the beamwidth of a broadside array. It is obtained by two ways. It is an array in which the amplitudes of the antenna elements in the array are arranged according to the coefficients of the binomial series. Finally the plane of polarization will usually have changed, this phenomenon is known as Faraday’ s rotation. It operates in 100MHz. Derive the expression for Permitivity and conductivity of ionized gas.? This Data Communication and Networking – Analog Transmission multiple choice Based Questions and Answers PDF cover the below lists of topic. i. Inverse bending. List the arrays used for array tapering . Introducing Textbook Solutions. The radiation intensity is independent of distance. A pinoybix mcq, quiz and reviewers. • E and H oscillate in phase and ratio of their amplitudes is constant and is equal to: 18. 59.At what distance from the dipole is the induction field equal to the radiation field? UGC NET PAPER-I (ENGLISH) EXCLUSIVE ONLINE COURSE @ JUST RS 399 /- ONLY, Antennas and Wave Propagation Viva Short Questions and Answers PDF, : Credits goes to the faculty and staff of Pavendar Bharathidasan Institute of Information Technology -, DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING. TQ, visit us again. 76.List the applications of helical antenna. Define dipole antenna. At low frequencies, the waves can pass through obstacles easily. Find the radiated power of an antenna if 10 Amp current exists and its radiation resistance 32 ohm. iii. Derive the expression for calculating field strength at a distance in space wave Propagation. Medium Frequency Polarization Power 2. Find the maximum effective area of an antenna at 2GHz when the directivity is 100. Which among the following is/are not present in free space? Explain about the frequencies used for radar 5. 21.Explain the concept of Reflection and refraction wavesby the ionosphere. Scattering aperture(As.) Waves that arrive at the receiver after reflection in the ionosphere is called sky wave. What is meant by similar Point sources.? 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. Earth’ s magnetic field. 4.Gives notes on the antenna impedances. Optimum frequency for transmitting between any two points is therefore selected as some frequency lying between about 50 and 85 percent of the predicted maximum usable frequency between those points. 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. Tags. Get step-by-step explanations, verified by experts. The effective radiated power ii. It is defined as n = c / vp Velocity of light in vacua n = Phase velocity in the medium n = ¥ r, The maximum Frequency that can be reflected back for a given distance of transmission is called the maximum usable frequency (MUF) for that distance. 37. 26. 41. wave velocity vp = c / ¥__- (fc / f)2 Group velocity, vp vg = c2 vg = c2 / vp. 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. Frequency diversity reception. It is the waves originate at a fictitious volumeless emitter source at the center ‘O’ of the observation circle. 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. Electrically Large loop antennas is one in which the overall length of the loop approaches the wavelength. 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. Derive the expression for radiation field and radiation resistance. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. This fact is utilized to minimize fading in radio telegraph circuits. Loss aperture. Self impedance of an antenna is defined as its input impedance with all other antennas are completely removed i.e away from it. What are the type of fading.? tenth wave length maximum specified for a short dipole.Elemental dipole is also called as elementary dipole,elementary doublet and hertzian dipole. ANTENNAS AND WAVE PROPAGATION 2015 MULTIPLE CHOICE QUESTIONS UNIT-1: ANTENNA BASICS 1. Axial mode of operation. The total beam area ( WA) consists of the main beam area ( WM ) plus the minor lobe area ( Wm) . Subscribe via Email, to get the latest articles [updates] from this site. • V elocity of propagation of a wave in free space is giv en by 3 × 10 8 m/s. Sky wave. a. 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? _____ is an antenna with a number of half-wave antenna on it. 29.i)What is folded dipole antenna ? Far field zone (Fraunhofer zone). 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. If the individual antennas of the array are spaced equally along a straight line. Polarization diversity. This means that if a sinusoidal voltage is input at the antenna terminals with amplitude 1 Volt, the current will have an amplitude of 1/50 = 0.02 Amps. 75.Which antenna will produce circularly polarized waves Helical antenna radiates circularly polarized wave. Space diversity reception. However, their powe… When these modes re-emerge from the ionosphere they recombine into a single plane wave again. Wave front is basically a locus of points acquiring similar. Relation between and Skip Distance, Multi-hop Propagation. Antennas convert -to-a) Attenuation of this wave is directly affected by the constant of earth along which it travels. Specially developed for the Electronic Engineering … It is also called as isotropic source or omni directional radiator or simply unipole. Due to the earth’ s magnetic fields, the ionosheric medium becomes an isotropic and the incident plane wave entering the ionosphere will split into ordinary and extra ordinary waves/modes. a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus … a. 85. CONDITIONS: Given this lesson material, pencil, paper and without supervision. The phenomenon of splitting the wave into two different components (ordinary and extra-ordinary) by the earths magnetic field is called Magneto-Ions Splitting. A. Antenna array . _It is used to estimate the direction of radio wave propagation. An antenna is a system of similar antennas oriented similarly to get greater directivity in a desired direction. 22. The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. If the elements are fed with currents of equal magnitude and having a uniform progressive phase shift along the line, then it is called uniform linear array . Derive basic radar’s equation 4. 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. What are the factors that affect the propagation of radio waves.? 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. Ans: A short dipole is one in which the field is oscillating because of the oscillating voltage and current.It is called so, because the length of the dipole is short and the current is almost constant throughtout the entire length of the dipole.It is also called as Hertzian Dipole which is a hypothetical antenna and is defined as a short isolated conductor carrying uniform alternating current. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. i. 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. Near field zone (Fresnel zone) ii. EM wave Acoustic wave TEM wave TE 10 wave 3. 3. Write the relative factors between the radar’s cross section of the target and its true cross sections 3. Explain Ground wave Propagation. Since,the short electric dipole is so short,the current which is flowing through the dipole is assumed to be constant throughtout its length.The effect of this current is not felt instantaneous at a distance point only after an interval equal to the time required for the wave to propagate over the distance r is called the retardation time. Inverse bending may transform line of sight path into an obstructed one. 2. ._, Useful tool in designing antenna ._It approximates the pattern of a complicated array without making lengthy computations. In this array the antenna elements are arranged coaxially by mounting the elements end to end in straight line or stacking them one over the other with radiation pattern circular symmetry. Derive the expression for the radiated field from a short dipole. Whenever the variation of the amplitude and the phase of the field with respect to the absolute angle for any two sources are same then they are called similar point sources. iv) collecting aperture. ii) Write a short note on Self and mutual impedance of antenna. Advantage: ._No minor lobes Disadvantages: ._Increased beam width ._Maintaining the large ratio of current amplitude in large arrays is difficult. 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. The power is given to one element from that other elements get by electro magnetic coupling. 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. Eg. ._Many satellites including weather satellites,data relay satellites all have helical antennas . 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? MUF = fcr_VHF_ i. ii. 1. D = 4p / WA. 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. It is the area over which the power is extrated from the incident wave and delivered to the load is called effective aperture. Under which conditions of charge does the radiation occur through wire antenna? 1. Antenna Wave Propagation Questions With Answers related files: 87244389a5b844c4a277fb9944d1a6da Powered by TCPDF (www.tcpdf.org) 1 / 1 It is the addition of above three apertures. 20. c) Both a and b. 8.What is End Fire array? What is the principle of the pattern multiplication? 70.What are Electrically Small loop antennas? The maximum amplitudes of the individual sources may be unequal. 28. This preview shows page 1 - 4 out of 31 pages. Collecting aperture. Write short notes on i) Ground wave propagation ii) space wave propagation. ._It is used as receiving antenna in portable radio and pagers . Absorption character of ionosphere for the paths between transmitter and receiver. The applications of helical antenna are: . Derive the radiation field and radiation resistance from a half wave dipole. 100. Antenna Wave & Propagation - Important Questions with Answers Which among the following is an application of high frequency? What is meant by reciprocity Theorem.? An antenna is an electrical conductor or system of conductors. 1 cm – 10 cm c. 10 cm – 1 m d. 0.1 cm – Antenna beamwidth is a measure of directivity of an antenna. The efficiency of an antenna is defined as the ratio of power radiated to the total input power supplied to the antenna. 55.Why a short dipole is called a oscillating dipole? (E Volts/m). Electrically Small loop antennas is one in which the overall length of the loop is less than one-tenth of the wavelength. 6.What are the different types of aperture.? Similar point sources with equal maximum amplitudes are called identical point sources. 12. 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Layer, the waves can pass through obstacles easily, Viva, Questions! Factor of time delay is generally introduced in a particular direction by an antenna given... Said to be considered for the binomial array. main beam area ( )... Endorsed by any college or university on I ) ground wave propagation fed to! A transducer between a guided wave and a free space Questions and Answers PDF cover the below lists of.! Exercises for free delivered to the direction of radiation is coincides with the array axis the troposphere region is surface! Basics 1 Faraday ’ s cross section of the Communications Engineering ( EST ) Board.. Of polarization will usually have changed, this phenomenon is known as Faraday ’ s rotation. are factors. Guided wave and ground reflected wave in turn depends upon the radio noise at the receiving and! Modification potential iii ) Skip zone iv ) virtual height of a layer sketch explain the operation of antenna... Resistance called called as radiation resistance of loop antenna = ò ò4p Pn (,... Around the earth surface is called the Axial ratio. a number of half-wave on! The load is called Tropospheric wave volumeless emitter source at the receiver after in! We provide here and check out the link by the constant of earth along which travels. A locus of points acquiring similar the normalized power pattern over a.... Brand new series: mcq in radiation and wave propagation Trivia Questions and Answers radiation! Textbook exercises for free earth along which it travels the lowest propagation speed as!