84. The key features are − 1. Antenna is a transition device or a transducer between a guided wave and a free space waveor vice versa. 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 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. Course Hero is not sponsored or endorsed by any college or university. It is the waves originate at a fictitious volumeless emitter source at the center ‘O’ of the observation circle. tenth wave length maximum specified for a short dipole.Elemental dipole is also called as elementary dipole,elementary doublet and hertzian dipole. 1 m – 10 m b. ANTENNAS AND WAVE PROPAGATION 2015 MULTIPLE CHOICE QUESTIONS UNIT-1: ANTENNA BASICS 1. Antenna is also said to be an impedance transforming device. 21.Explain the concept of Reflection and refraction wavesby the ionosphere. Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. 28. a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus … Frequency of the signal. The book begins with an introduction that discusses the fundamental concepts, notations, representation and principles that govern the field of antennas. 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. The radiation intensity is independent of distance. (Ae). 16. 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. 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. 55.Why a short dipole is called a oscillating dipole? 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 &. Are your products and/ services do relate to this; then why you are waiting. 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. Beam efficiency = SM = WM / WA. i. TQ, visit us again. 71.What are Electrically large loop antennas? 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. Eg. Electrically Small loop antennas is one in which the overall length of the loop is less than one-tenth of the wavelength. 75.Which antenna will produce circularly polarized waves Helical antenna radiates circularly polarized wave. Specially developed for the Electronic Engineering … 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. ii). _It is used to estimate the direction of radio wave propagation. 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. Bandwidth 2. The power radiated from an antenna per unit solid angle is called the radiation intensity U (watts per steradian or per square degree). 30. Scattering aperture. 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? T e c h . 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 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. In this array the elements are fed parasitically to reduce the problem of feed line. ii) With neat sketch explain the operation of Helical antenna. 3. Electrically Large loop antennas is one in which the overall length of the loop approaches the wavelength. EM wave Acoustic wave TEM wave TE 10 wave 3. The energy radiated in a particular direction by an antenna is measured in terms of FIELD STRENGTH. D = 4p / WA. Letan antenna has an impedance of 50 ohms. (See Figure from John. 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. To minimize the fading and to avoid the multi path interference the technique used are diversity reception. Sky wave. The required field strength which in turn depends upon the radio noise at the receiving location and type of service involved . 36. Waves propagated over other paths near the earth surface is called ground wave propagation. 2. 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. 8.What is End Fire array? Directivity from Pattern. 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. 31.i) Explain the construction of Yagi antenna. EmoticonEmoticon. What is meant by reciprocity Theorem.? 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. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. Which among the following is an application of high frequency? 42. The ratio of the main beam area to the total beam area is called beam efficiency. Give it a try and share your score. Directivity from beam area(WA ). [ ] a) Linear. 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. Effective aperture(Ae). Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF An antenna's impedance relates the voltage to the current at the input to the antenna. 16. 3. Tags. 56.What do you understand by retarded current? 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. Derive the expression for radiation resistance of loop antenna with circumference equal to wavelength. 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. The maximum amplitudes of the individual sources may be unequal. 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. ._, Useful tool in designing antenna ._It approximates the pattern of a complicated array without making lengthy computations. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. ii) Specify the design consideration for a rhombic antenna. 100. Page 2/9. Page 5 MULTIPLE CHOICE QUESTIONS UNIT-3: ANTENNA ARRAYS 1. Explain in detail about the aperture Concept, 3.Briefly explain the radiation from a short dipole. ._Many satellites including weather satellites,data relay satellites all have helical antennas . Near field zone (Fresnel zone) ii. This is the Multiples Choice Questions Part 1 of the Series in Antennas as one of the Communications Engineering topic. What are the factors that affect the propagation of radio waves.? wave velocity vp = c / ¥__- (fc / f)2 Group velocity, vp vg = c2 vg = c2 / vp. i.e FBR = Power radiated in desired direction / power radiated in the opposite direction. A. Antenna array . 1. Collecting aperture. iii. * Ask us, what you want? _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. iii. Antenna Wave & Propagation - Important Questions with Answers iv) collecting aperture. 43. Define wave velocity and Group velocity.? A isotropic radiator is a fictitious radiator and is defined as a radiator which radiates fields uniformly in all directions. Communication and Networking – Analog transmission multiple choice Questions UNIT-1: antenna and propagation. Large arrays is difficult an arrangement in which the overall length of the target and its radiation of! Recombine into a single plane wave again one-tenth of the major to the total beam area or beam solid or! Omni directional radiator or simply unipole array length is increased to increase the directivity is 100 career as an in... 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