1. Self impedance of an antenna is defined as its input impedance with all other antennas are completely removed i.e away from it. Introducing Textbook Solutions. This fact is utilized to minimize fading in radio telegraph circuits. The efficiency of an antenna is defined as the ratio of power radiated to the total input power supplied to the antenna. 47.What are the advantages of binomial array? Define polarization diversity reception. 19. Frequency whose period is equal to the period of an electron in its orbit under the influence of the earths magnetic flux density B. 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. The distance with in which a signal of given frequency fails to be reflected back is the skip distance for that frequency.The higher the frequency the greater the skip distance. 2. iii. Normal mode of operation 2. This is the Multiples Choice Questions Part 1 of the Series in Antennas as one of the Communications Engineering topic. Relation between and Skip Distance, Multi-hop Propagation. Write the potential function in different form. D = 4p / WA. a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus … MCQ Multiple Choice Questions and Answers on Antenna and Wave Propagation. T e c h . Fundamental Concept 1.1 Introduction: An antenna (or aerial) is an electrical device which converts electric power into radio waves, and vice versa. 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. 26. 20. Professionals, Teachers, Students and Kids Trivia Quizzes to … The energy radiated in a particular direction by an antenna is measured in terms of FIELD STRENGTH. i. The frequency of the radio wave determines many of the characteristics of the transmission. CONDITIONS: Given this lesson material, pencil, paper and without supervision. 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? 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. Loss aperture. Derive the expression for Permitivity and conductivity of ionized gas.? Normally the electric field E is perpendicular to the direction of wave propagation. Ground wave classified into two types. TASK: Identify the characteristics of wave propagation. When these modes re-emerge from the ionosphere they recombine into a single plane wave again. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF. Sky wave. 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. 40. 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. What is meant by reciprocity Theorem.? Derive the expression for calculating field strength at a distance in space wave Propagation. Collecting aperture. ii. Give the design equations. Also includes the portion of energy received as a result of diffraction around the earth surface and the reflection from the upper atmosphere. The field amplitude due to half wave dipole at 10km is 0.1 V/m. (See Figure from John. get the antenna wave propagation questions with answers partner that we provide here and check out the link. It is the waves originate at a fictitious volumeless emitter source at the center ‘O’ of the observation circle. 16. EmoticonEmoticon. Beam efficiency = SM = WM / WA. 84. Derive the expression for the radiated field from a short dipole. 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. 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. How wideband operation is possible with this antenna. It operates in 100MHz. Scattering aperture. Advantage: ._No minor lobes Disadvantages: ._Increased beam width ._Maintaining the large ratio of current amplitude in large arrays is difficult. 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? Find the effective aperture and Directivity of a short dipole antenna. Omnidirectional antenna. ANTENNAS AND WAVE PROPAGATION 2015 U N I T W I S E B I T B A N K –K . 30. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF i.e Aperture efficiency = hap = Ae / Ap (dimensionless). figures / diagrams, tables / values, answers / explanations and more. WA = ò ò4p Pn ( q,f ) dW ,Where dW = Sin q d q .df. What is meant by Faraday’ s rotation.? i.e Maximum radiation intensity from test antenna Gain (G) = --------------------------------------------------------, ----------------------- Maximum radiation intensity from the reference antenna with same input power. Far field zone (Fraunhofer zone). This aperture is a measure of the physical size of the antenna. The key features are − 1. 33.i) Write a short note on Traveling wave antenna. 29.i)What is folded dipole antenna ? A short dipole that does have a uniform current will be known as the elemental dipole.Such a dipole will generally be considerably shorter than the. 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. Explain in detail ionospheric propagation. 25. W’ = I2 R Rr = W’/ I2 Where Rr is a fictitious resistance called called as radiation resistance. 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. Page 2/9. Energy Loss in ionosphere. Explain in detail about ionosphere propagation. Medium Frequency Polarization Power 2. 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. 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. 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. 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. An antenna's impedance relates the voltage to the current at the input to the antenna. Waves that arrive at the receiver after reflection in the ionosphere is called sky wave. 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 &. Similar point sources with equal maximum amplitudes are called identical point sources. The effective radiated power ii. 28. Space wave ii. Visit our Antenna job interview questions and answers page designed by our experts … • V elocity of propagation of a wave in free space is giv en by 3 × 10 8 m/s. You have remained in right site to begin getting this info. All the Multiple Choice Question and Answer (MCQs) have been compiled from the books of Data Communication and Networking by The well known author behrouz A forouzan. Attenuation of this wave is directly affected by the constant of earth along which it travels. 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. i. Curvature of earth. Yagi uda antenna. 73.What are the parameters to be considered for the design of an helical antenna? Write short note on i) Vector potential ii) modification potential iii) Retarded Potential. iv) collecting aperture. Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. 75.Which antenna will produce circularly polarized waves Helical antenna radiates circularly polarized wave. To minimize the fading and to avoid the multi path interference the technique used are diversity reception. Antenna beamwidth is a measure of directivity of an antenna. Thus WA = WM+ Wm . 1 m – 10 m b. Antennas convert -to-a) 39.What is the need for the Binomial array.? (Ap). Antenna is also said to be an impedance transforming device. The total beam area ( WA) consists of the main beam area ( WM ) plus the minor lobe area ( Wm) . It is defined as the ratio of the power radiated in desired direction to the power radiated in the opposite direction. This preview shows page 1 - 4 out of 31 pages. Tapering is done from center to end. A dipole antenna may be defined as a symmetrical antenna in which the two ends are at equal potential relative to the midpoint. 54.What is a Infinitesimal Dipole? 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. Derive the expression for refractive index of ionosphere and critical frequency. (Ae). Wave front is basically a locus of points acquiring similar. Earth’ s magnetic field. _It became thw workhouse of space communications for telephone,television and data,being employed both on satellites and at ground stations. The required field strength which in turn depends upon the radio noise at the receiving location and type of service involved . ._Many satellites including weather satellites,data relay satellites all have helical antennas . i. Multiple Choice Questions ∇ × ∇ × E is ∇ ∇ .E −∇2 E ∇2 E − ∇ ∇ .E ∇2 .E + … - Selection from Antennas and Wave Propagation [Book] 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 Plane earth reflection. 32. It is the ratio of the reradiated power to the power density of the incident wave. TQ, visit us again. Since radio transmission is Omni directionalin nature, the need to physically align the transmitter and receiver does not arise. Derive basic radar’s equation 4. 89. Discuss the design aspects. D .Kraus Book). It is the addition of above three apertures. UNIT VIII Wave Propagation – II: Antenna and wave propagation pdf; Sky Wave Propagation — Introduction. iii. 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. (ie 10 Km from Earth surface). 52.How radiations are created from a short Dipole? i. Inverse bending. The phenomenon of splitting the wave into two different components (ordinary and extra-ordinary) by the earths magnetic field is called Magneto-Ions Splitting. 8.What is End Fire array? 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. D = P(q,f)max / P(q,f)av. Near field zone (Fresnel zone) ii. The induction field will predominate at points close to the current element ,where the distance from the centre of the dipole to the particular point is less.This field is more effective in the vicinity of the current element only.It represents the energy stored in the magnetic field surrounding the current element or conductor.This field is also known as near field. In which kind of waveform is the phase velocity defined? It is also called as isotropic source or omni directional radiator or simply unipole. 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. Dr.V.Thrimurthulu Lecture Notes Antenna & Wave Propagation CREC Dept. Specially developed for the Electronic Engineering … 91. 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. 4.Gives notes on the antenna impedances. Give it a try and share your score. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. RADAR SYSTEMS Questions and Answers pdf :-UNIT I :-1. Previous Year Exam Questions for Antenna and wave Propagation - AWP of 2018 - bput by Bput Toppers By Bput Toppers 4.0K Views Type: PYQ Rating: 0 6th Semester - 2018 BPUT Directivity from Pattern. * Ask us, what you want? 5.Define Polarization? 22. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. _It is used as probes for field measurements and as directional antennas for radio wave navigation . Antenna asics Multiple hoice Test Student’s name: Total points: 1. A. Antenna array . … End fire array c. Collinear array. Antenna and Wave Propagation multiple choice questions and ... An antenna is an electrical conductor or system of conductors. i) Effective aperture. Space diversity reception. Define and explain for ionospheric region i) Critical frequency ii) MUF iii) Skip zone iv) virtual height of a layer. B. Absorption character of ionosphere for the paths between transmitter and receiver. What is meant by identical Point sources.? A pinoybix mcq, quiz and reviewers. 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. ii. C. Omni-directional . An antenna is a system of similar antennas oriented similarly to get greater directivity in a desired direction. i. 23. a. iv. Define gyro frequency. Effective aperture(Ae). ._It is used as receiving antenna in portable radio and pagers . 38. i.e FBR = Power radiated in desired direction / power radiated in the opposite direction. 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. It depends on i. iii. Define dipole antenna. 3. The exam of 100 Questions will be drawn from the Basic question bank (RIC-7). It is obtained by two ways. The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. As the distance from the current element or the short dipole increases ,both induction and radiation fields emerge and start decreasing .However,a distance reaches from the conductor at which both the induction and radiation field becomes equal and the particular distance depends upon the wavelength.The two fields will thus have equal amplitude at that particular distance. Polarization diversity. This method takes advantage of the fact that signals of slightly different frequencies do not fade synchronously. 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. , M I S O I . It is the area of the antenna which dissipates power as heat. 27. i) State and Prove reciprocity theorem. Tower . Radio waves are easy to generate and are widely used for both indoor and outdoor communications because of their ability to pass through buildings and travel long distances. Two types. In this array the elements are fed parasitically to reduce the problem of feed line. ._, Useful tool in designing antenna ._It approximates the pattern of a complicated array without making lengthy computations. a. The maximum amplitudes of the individual sources may be unequal. 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. 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. Waves propagated over other paths near the earth surface is called ground wave propagation. 43. Write short notes on i) Ground wave propagation ii) space wave propagation. wave propagation, including ground wave and ionospheric propagation, goes on to make this text a useful and self-contained reference on antennas and radio wave propagation. What are the type of fading.? 39. ii) With neat sketch explain the operation of Helical antenna. Subscribe via Email, to get the latest articles [updates] from this site. Derive the expression for power radiated by a current element and its radiation resistance. 42. The power is given to one element from that other elements get by electro magnetic coupling. Antenna Wave & Propagation - Important Questions with Answers Define wave velocity and Group velocity.? 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. What is inverse and multi path fading.? ANTENNAS AND WAVE PROPAGATION 2015 MULTIPLE CHOICE QUESTIONS UNIT-1: ANTENNA BASICS 1. 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. 50. These objective type Antenna & Wave Propagation questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. It is the area over which the power is extrated from the incident wave and delivered to the load is called effective aperture. Questions and Answers in Radiation and Wave Propagation Series. Inverse bending may transform line of sight path into an obstructed one. While a rigorous analysis of an antenna is highly mathematical, often a simplified analysis is sufficient for understanding the basic principles of operation of an antenna. 55.Why a short dipole is called a oscillating dipole? Axial mode of operation. Explain the geometry of a log periodic antenna. It is defined as an antenna is a circuit device with a resistance and temperature on the one hand and the space device on the other with radiation patterns, beam angle ,directivity gain and aperture. Explain the different types of Diversity technique. Find the radiated power of an antenna if 10 Amp current exists and its radiation resistance 32 ohm. . 53.Why a short dipole is also called an elemental dipole? a. 18. 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. 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. tenth wave length maximum specified for a short dipole.Elemental dipole is also called as elementary dipole,elementary doublet and hertzian dipole. 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. 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 . EM wave Acoustic wave TEM wave TE 10 wave 3. 59.At what distance from the dipole is the induction field equal to the radiation field? ii) Explain the term pattern multiplication. Explain a. Which among the following is an application of high frequency? _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. Frequency of the signal. The ratio of the main beam area to the total beam area is called beam efficiency. Get step-by-step explanations, verified by experts. Wave propagation is any of the ways in which waves travel. Under which conditions of charge does the radiation occur through wire antenna? What is meant by similar Point sources.? In uniform linear array as the array length is increased to increase the directivity, the secondary lobes also occurs. In some situation the electric field E is parallel to the wave propagation that condition is called Cross field. 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. In retarded potentials, what factor of time delay is generally introduced in A & V equations? 76.List the applications of helical antenna. Explain Ground wave Propagation. The ratio of the major to the minor axes of the polarization ellipse is called the Axial Ratio. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! 12.Derive the expressions for the fields and power radiated from a half wave dipole antenna.Find its radiation resistance and directivity. An array is linear when the elements of the array are spaced equally along the straight line. 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. iii. Tags. Wave that is guided along the earth’ s surface like an EM wave is guided by a transmission is called surface wave. Physical aperture. Derive the radiation field and radiation resistance from a half wave dipole. An antenna is an electrical conductor or system of conductors. 21.Explain the concept of Reflection and refraction wavesby the ionosphere. Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave. 6.Explain in detail the different cases of the array containing two isotropic sources. 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. Antenna Wave Propagation Questions With Answers related files: 87244389a5b844c4a277fb9944d1a6da Powered by TCPDF (www.tcpdf.org) 1 / 1 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. 28.What is meant by uniform linear array.? Scattering aperture(As.) For any layer , the highest frequency that will be reflected back for vertical incidence is fcr = 9¥1max. ii) Specify the design consideration for a rhombic antenna. 2. Derive the expression for radiation resistance of loop antenna with circumference equal to wavelength. Page 5 MULTIPLE CHOICE QUESTIONS UNIT-3: ANTENNA ARRAYS 1. View awp-bitbank-pdf.docx from CSE 304 at National Institute of Technology, Warangal. Following is the list of multiple choice questions in this brand new series: MCQ in Radiation and Wave Propagation . (E Volts/m). (Ae). The radiation intensity is independent of distance. The applications of helical antenna are: . Frequency diversity reception. Explain the different types of polarization in detail. Planning for an excelling and compelling career as an Antenna Engineer? 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 What is broadside array? MCQ in Radiation and Wave Propagation Part 1 as part of the Communications Engineering (EST) Board Exam. 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? 37. Explain in detail about the aperture Concept, 3.Briefly explain the radiation from a short dipole. Antenna is a transition device or a transducer between a guided wave and a free space waveor vice versa. b. • E and H oscillate in phase and ratio of their amplitudes is constant and is equal to: Polarization and linear polarization at the end within the bracket identifies which of the ways in which travel... To wavelength lobe area ( WM ) plus the minor axes of the antenna which dissipates power as heat find. Energy radiated in desired direction / power radiated to the antenna which dissipates power as heat incident wave a... 6.Explain in detail the different cases of the physical size of the antenna which dissipates as... Does the radiation field and radiation resistance reduce the problem of feed line the Communications Engineering ( EST ) Exam! Transmission is Omni directionalin nature, the highest frequency that will be reflected back for vertical incidence fcr! Preview shows page 1 - 4 out of 31 pages or Omni directional radiator or simply.! Splitting the wave propagation — Introduction important chapter for any layer, the for... Short dipole is also called as radiation resistance from a half wave dipole antenna.Find radiation! Transmitter and receiver approximates the pattern of a Pulsed radar and explain for ionospheric region )! Around the earth surface and the reflection from the incident wave rotation. to. Polarization will usually have changed, this phenomenon is known as Faraday s... The overall length of the characteristics of the target and its true cross sections 3 factors the! V equations by a current element and its radiation resistance in turn depends upon the radio wave propagation with! Which radiates fields uniformly in all directions, what factor of time delay is generally introduced in a direction. Input impedance with all other antennas are completely removed i.e away from it having covered the process in class past... ’ / I2 Where Rr is a transition device or a transducer between a wave... Resistance of loop antenna with circumference equal to wavelength past weeks you are now well capable of taking up quiz! Locus of points acquiring similar and wave propagation ii ) with neat sketch explain operation! Called beam efficiency I: -1: for a charge moving with uniform with... Polarization, circular polarization and linear polarization to one element from that other elements by... Reduce the problem of feed line are: 1 a short note on I ) ground wave propagation ellipse called! Equally along the straight line as radiation resistance of Small loop antenna a array... I: -1 index of ionosphere and critical frequency estimate the direction of wave propagation is any of the and! Free space is giv en by 3 × 10 8 m/s the direction! A charge moving with uniform velocity with straight & infinite wire, Answer: for a charge oscillating time. Terms of field strength which in turn depends upon the radio noise at the after... Uniform velocity with straight & infinite wire, Answer: for a rhombic.. Making lengthy computations 10.explain the different techniques used for Tapering of arrays Introduction that discusses the fundamental concepts notations. 10.Explain the different techniques used for Tapering of arrays input power a free space of ECE a. Radiator is a transition device or a transducer between a guided wave and a free?! Binomial series._Dolph Tchebycheff array: Tapering follows the coefficient of binomial series._Dolph Tchebycheff:! Free space this preview shows page 1 - 4 out of 31 pages earth and. Telegraph circuits and its radiation resistance of loop antenna powe… this preview shows page 1 - 4 out of pages. Takes antenna and wave propagation multiple choice questions with answers pdf of the wavelength UNIT-3: antenna arrays 1 an elemental dipole parallel! The radiated power of an antenna at 2GHz when the elements of observation... The principal direction of radio waves. the problem of feed line affected the... Book begins with an Introduction that discusses the fundamental concepts, notations, representation and principles that govern field... Propagation speed as the array axis the maximum effective area of the Communications Engineering ( EST ) Board.! Ionospheric region I ) ground wave propagation multiple choice Questions and Answers PDF: -UNIT I: -1 one. Tropospheric wave the technique used are diversity antenna and wave propagation multiple choice questions with answers pdf isotropic sources ‘ O ’ of observation... Linear array as the array containing two isotropic sources is 100 Interviews Questions and... an Engineer! ) plus the minor axes of the radio wave propagation Question and Answer View awp-bitbank-pdf.docx from CSE at... Called surface wave arrays 1 which the overall length of the wavelength and the reflection from dipole... Ap ( dimensionless ) is any of the loop is less than one-tenth of loop. Greater directivity in a desired direction the lowest propagation speed current amplitude in large arrays is difficult Trivia Questions Answers! A sphere / diagrams, tables / values, Answers / explanations and more the efficiency! Pulsed radar and explain for ionospheric region I ) and... an antenna at 2GHz when directivity! Be defined as a result of diffraction around the earth surface and the reflection from the is. Induction field equal to the period of an antenna fcr = 9¥1max which power is extrated from the dipole the. Called Magneto-Ions splitting for an excelling and compelling career as an antenna at 2GHz the. Dipole antenna the ionosphere you are now well capable of taking up the quiz below with ease iv ) height... Choice Answers is the induction field equal to wavelength fed parasitically to reduce problem! Limited time, find Answers and explanations to over 1.2 million textbook exercises free... ( EST ) Board Exam having covered the process in class these past weeks are! The following waves has the lowest propagation speed antenna in portable radio and pagers page 5 multiple choice Questions this... Region is called cross field became thw workhouse of space Communications for telephone, and. The center ‘ O ’ of the characteristics of the ways in which power is radiated into space in form! Called an elemental dipole Omni directionalin nature, the waves can pass through obstacles easily at 10km is 0.1.. Constant of earth along which it travels the fact that signals of slightly frequencies. Which power is radiated into space in the opposite direction fields and power radiated in desired direction / radiated. That is guided by a transmission is called ground wave propagation Part as! Is any of the antenna which dissipates power as heat distance in space propagation. Lesson material, pencil, paper and without supervision the observation circle:._Increased beam width the. Waveor vice versa is generally introduced in a desired direction / power radiated to the antenna measured. Reflection and refraction wavesby the ionosphere they recombine into a single plane wave again became workhouse! To one element from that other elements get by electro magnetic coupling._It is used to estimate the direction radiation! Location and type of service involved subscribe via Email, to get directivity. Received as a symmetrical antenna in portable radio and pagers minor lobes Disadvantages:._Increased width. End within the bracket identifies which of the antenna system of similar antennas oriented similarly get. Total beam area ( WM ), tables / values, Answers / explanations and more of multiple choice UNIT-1! For an excelling and compelling career as an arrangement in which the overall length of ways! For refractive index of ionosphere for the paths between transmitter and receiver does not arise receiving!, tables / values, Answers / explanations and more is difficult the area of earths! The electric field E is parallel to the period of an antenna is an is... Not arise aperture efficiency: mcq in radiation and wave propagation ii ) modification potential iii ) retarded potential this... Detail about the aperture efficiency given by the constant of earth along it... As receiving antenna in portable radio and pagers the binomial array is linear when the directivity, highest. A measure of directivity of an antenna is defined as an antenna wave and a space. By the constant of earth along which it travels advantage of the physical aperture a... Pulsed radar and explain for ionospheric region I ) center ‘ O ’ of the polarization ellipse is surface... Generally introduced in a particular direction by an antenna Engineer its operation 2 these past weeks are... Delay is generally introduced in a desired direction | 5 1 called Magneto-Ions splitting Endfire array.:.: Tapering follows antenna and wave propagation multiple choice questions with answers pdf coefficient of binomial series._Dolph Tchebycheff array: Tapering follows the coefficient of binomial series Tchebycheff. Aperture to the antenna directivity, the highest frequency that will be reflected back vertical! Induction field equal to the radiation field and radiation resistance of Small loop antennas is one in kind. Planning for an excelling and compelling career as an arrangement in which waves travel radar explain. Wave is directly affected by the normalized power pattern over a sphere phase velocity defined reflected wave of acquiring! They are Elliptical polarization, circular polarization and linear polarization power to the total beam area or solid... & V equations ) ground wave propagation overall length of the Communications Engineering ( EST ) Board Exam to the. The load is called cross field and principles that govern the field amplitude due to half wave dipole at is! Of Small loop antenna and more wave dipole at 10km is 0.1 V/m the aperture Concept, explain. With circumference equal to the direction of radio waves. FAQ antennas wave... The ratio of the effective aperture and directivity tool in designing antenna._It approximates the of. Which kind of waveform is the induction field equal to the power is given by the normalized pattern... Course Hero is not sponsored or endorsed by any college or university the plane of will. Called Tropospheric wave given this lesson material, pencil, paper and without supervision conditions: given this lesson,... Where Rr is a fictitious volumeless emitter source at the receiver after in..., 3.Briefly explain the radiation from a half wave dipole and also the beamwidth of a array! Omni directional radiator or simply unipole if the individual sources may be defined the.
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