Tower . Omnidirectional antenna. Write short notes on i) Ground wave propagation ii) space wave propagation. 20. Define polarization diversity reception. 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. Wave propagation is any of the ways in which waves travel. 18. 37. _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. ii. TASK: Identify the characteristics of wave propagation. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. iii. 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. wave velocity vp = c / ¥__- (fc / f)2 Group velocity, vp vg = c2 vg = c2 / vp. Waves that arrive at the receiver after reflection in the ionosphere is called sky wave. The number at the end within the bracket identifies which of the four multiple choice answers is the correct one. 40. Antennas convert -to-a) For a charge moving with uniform velocity with straight & infinite wire, ANSWER: For a charge oscillating in time motion. of ECE P a g e | 5 1. (See Figure from John. What is meant by front to back ratio.? 39.What is the need for the Binomial array.? It is the addition of above three apertures. * To get Clear; figures / diagrams, tables / values, answers / explanations and more, download the Antennas and Wave Propagation Viva Short Questions and Answers PDF. Antenna Wave Propagation Questions With Answers related files: 87244389a5b844c4a277fb9944d1a6da Powered by TCPDF (www.tcpdf.org) 1 / 1 ... 21. tenth wave length maximum specified for a short dipole.Elemental dipole is also called as elementary dipole,elementary doublet and hertzian dipole. 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. Yagi uda antenna. You have remained in right site to begin getting this info. 17.Explain diversity reception.? UNIT VIII Wave Propagation – II: Antenna and wave propagation pdf; Sky Wave Propagation — Introduction. 84. d. Parasitic array. 29.i)What is folded dipole antenna ? ii. Frequency diversity reception. Antenna is also said to be an impedance transforming device. i. Curvature of earth. Multi path fading. It operates in 100MHz. Antenna Wave & Propagation - Important Questions with Answers 1. 4. iii. 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. i. Collecting aperture. 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? A dipole antenna may be defined as a symmetrical antenna in which the two ends are at equal potential relative to the midpoint. Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. 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. 88 .Define frequency diversity Reception. Antenna efficiency = Power radiated / Total input power. a. Antenna and Wave Propagation Question and Answer Discuss the design aspects. 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. The key features are − 1. ._Many satellites including weather satellites,data relay satellites all have helical antennas . Dear Readers, Welcome to Antenna & Wave Propagation multiple choice questions and answers with explanation. 73.What are the parameters to be considered for the design of an helical antenna? Define wave velocity and Group velocity.? The book begins with an introduction that discusses the fundamental concepts, notations, representation and principles that govern the field of antennas. 52.How radiations are created from a short Dipole? The energy radiated in a particular direction by an antenna is measured in terms of FIELD STRENGTH. Scattering aperture(As.) 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. What is meant by Faraday’ s rotation.? 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. Broad side array. It is the ratio of the reradiated power to the power density of the incident wave. It is the waves originate at a fictitious volumeless emitter source at the center ‘O’ of the observation circle. 92. Draw the block diagram of a Pulsed radar and explain its operation 2. Explain about the frequencies used for radar 5. 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). Write the potential function in different form. End fire array is defined as an arrangement in which the principal direction of radiation is coincides with the array axis. 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. i. Inverse bending. 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. Visit our Antenna job interview questions and answers page designed by our experts … figures / diagrams, tables / values, answers / explanations and more. What are the factors that affect the propagation of radio waves.? ._Isotropic source is not physically realizable but non-isotropic source is physically realizable. 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. Antenna beamwidth is a measure of directivity of an antenna. 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. 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. 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. The field amplitude due to half wave dipole at 10km is 0.1 V/m. At low frequencies, the waves can pass through obstacles easily. Subscribe via Email, to get the latest articles [updates] from this site. 26. Give it a try and share your score. ii) Explain the term pattern multiplication. Introducing Textbook Solutions. It is the area of the antenna which dissipates power as heat. Derive the expression for Permitivity and conductivity of ionized gas.? View awp-bitbank-pdf.docx from CSE 304 at National Institute of Technology, Warangal. 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. An antenna is an electrical conductor or system of conductors. Bandwidth 2. The antenna is a radiating device in which power is radiated into space in the form of electromagnetic wave. 39. Derive the expression for radiation resistance of small loop 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. Derive the expression for refractive index of ionosphere and critical frequency. Give the design equations. Define dipole antenna. 27. i) State and Prove reciprocity theorem. 3. 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. (E Volts/m). 1 cm – 10 cm c. 10 cm – 1 m d. 0.1 cm – Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave. Then It is -----array. The exam of 100 Questions will be drawn from the Basic question bank (RIC-7). 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 The parameters to be considered for the design of an helical antenna are: 1. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers 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. Under which conditions of charge does the radiation occur through wire antenna? Sky wave. 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. Following is the list of multiple choice questions in this brand new series: MCQ in Radiation and Wave Propagation . Tapering is done from center to end. ANTENNAS AND WAVE PROPAGATION 2015 MULTIPLE CHOICE QUESTIONS UNIT-1: ANTENNA BASICS 1. 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. 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. 23. 55.Why a short dipole is called a oscillating dipole? Derive the radiation field and radiation resistance from a half wave dipole. Derive the expression for Permitivity and conductivity of ionized gas. Similar point sources with equal maximum amplitudes are called identical point sources. 31.i) Explain the construction of Yagi 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. 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. Find the radiated power of an antenna if 10 Amp current exists and its radiation resistance 32 ohm. The power radiated from an antenna per unit solid angle is called the radiation intensity U (watts per steradian or per square degree). EM wave Acoustic wave TEM wave TE 10 wave 3. Directivity from beam area(WA ). 10.Explain the different techniques used for tapering of arrays. 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. A isotropic radiator is a fictitious radiator and is defined as a radiator which radiates fields uniformly in all directions. Antenna asics Multiple hoice Test Student’s name: Total points: 1. 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. Physical aperture. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. In which kind of waveform is the phase velocity defined? WA = ò ò4p Pn ( q,f ) dW ,Where dW = Sin q d q .df. 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? 59.At what distance from the dipole is the induction field equal to the radiation field? 76.List the applications of 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. i.e FBR = Power radiated in desired direction / power radiated in the opposite direction. Wave front is basically a locus of points acquiring similar. What is meant by similar Point sources.? The need for a binomial array is i). b) Non-Linear. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Space wave ii. 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. Tags. Give it a try and share your score. Polarization diversity. In uniform linear array as the array length is increased to increase the directivity, the secondary lobes also occurs. 42. B. ii) Specify the design consideration for a rhombic antenna. 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. Letan antenna has an impedance of 50 ohms. i) Effective aperture. 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 &. W’ = I2 R Rr = W’/ I2 Where Rr is a fictitious resistance called called as radiation resistance. 50. 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. The ratio of the main beam area to the total beam area is called beam efficiency. Earth’ s magnetic field. iii) Loss aperture. Waves propagated over other paths near the earth surface is called ground wave propagation. i. 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 . 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. _It is used to estimate the direction of radio wave propagation. Gain 3. 1 m – 10 m b. Specially developed for the Electronic Engineering … The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. 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, To minimize the fading and to avoid the multi path interference the technique used are diversity reception. 1 m – 10 m b. 75.Which antenna will produce circularly polarized waves Helical antenna radiates circularly polarized wave. Inverse bending may transform line of sight path into an obstructed one. 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