Plane earth reflection. Explain a. 25. 1. Tower . i.e Maximum radiation intensity from test antenna Gain (G) = --------------------------------------------------------, ----------------------- Maximum radiation intensity from the reference antenna with same input power. 50. Define wave velocity and Group velocity.? Which of the following waves has the lowest propagation speed? Find dipole length and radiated power. iv) collecting aperture. Wave that is guided along the earth’ s surface like an EM wave is guided by a transmission is called surface wave. It depends on i. 20. An antenna's impedance relates the voltage to the current at the input to the antenna. 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. Define polarization diversity reception. Frequency whose period is equal to the period of an electron in its orbit under the influence of the earths magnetic flux density B. 3. The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Beam efficiency = SM = WM / WA. 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 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. Also includes the portion of energy received as a result of diffraction around the earth surface and the reflection from the upper atmosphere. 19. 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? Derive basic radar’s equation 4. * Ask us, what you want? 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. 71.What are Electrically large loop antennas? RADAR SYSTEMS Questions and Answers pdf :-UNIT I :-1. The ratio of the effective aperture to the physical aperture is the aperture efficiency. Frequency diversity reception. Antenna and Wave Propagation multiple choice questions and ... An antenna is an electrical conductor or system of conductors. i. Inverse bending. Directivity from beam area(WA ). 100. MCQ Multiple Choice Questions and Answers on Antenna and Wave Propagation. It is the ratio of the reradiated power to the power density of the incident wave. The number at the end within the bracket identifies which of the four multiple choice answers is the correct one. 4. It operates in 100MHz. 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. ANTENNAS AND WAVE PROPAGATION 2015 U N I T W I S E B I T B A N K –K . This method takes advantage of the fact that signals of slightly different frequencies do not fade synchronously. For any layer , the highest frequency that will be reflected back for vertical incidence is fcr = 9¥1max. 39. Give it a try and share your score. Collecting aperture. An antenna is an electrical conductor or system of conductors. Page 5 MULTIPLE CHOICE QUESTIONS UNIT-3: ANTENNA ARRAYS 1. Give the design equations. Axial mode of operation. 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. \34. Questions and Answers in Radiation and Wave Propagation Series. Computer Networks MCQ Questions and Answers with PDF Download is offered here so that you can prepare your exams better and score good marks for this chapter. 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. The key features are − 1. If the individual antennas of the array are spaced equally along a straight line. Thus WA = WM+ Wm . Since radio transmission is Omni directionalin nature, the need to physically align the transmitter and receiver does not arise. Tapering is done from center to end. Define gyro frequency. 2. (Ae). 56.What do you understand by retarded current? Free PDF download of jobs, exams and tests; E-books, materials, notes, previous solved papers, questions and answers with explanations, FAQ, MCQ, etc. The book begins with an introduction that discusses the fundamental concepts, notations, representation and principles that govern the field of antennas. * To get Clear; figures / diagrams, tables / values, answers / explanations and more, download the Antennas and Wave Propagation Viva Short Questions and Answers PDF. , M I S O I . Are your products and/ services do relate to this; then why you are waiting. _____ is an antenna with a number of half-wave antenna on it. (Ae). Planning for an excelling and compelling career as an Antenna Engineer? UNIT VIII Wave Propagation – II: Antenna and wave propagation pdf; Sky Wave Propagation — Introduction. End fire array is defined as an arrangement in which the principal direction of radiation is coincides with the array axis. 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. Dear Readers, Welcome to Antenna & Wave Propagation multiple choice questions and answers with explanation. At low frequencies, the waves can pass through obstacles easily. [ ] a) Linear. Directivity from Pattern. 4.Gives notes on the antenna impedances. tenth wave length maximum specified for a short dipole.Elemental dipole is also called as elementary dipole,elementary doublet and hertzian dipole. Write the potential function in different form. Earth’ s magnetic field. Derive the expression for Permitivity and conductivity of ionized gas. 8.What is End Fire array? iii) Loss aperture. View awp-bitbank-pdf.docx from CSE 304 at National Institute of Technology, Warangal. Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. Derive the expression for calculating field strength at a distance in space wave Propagation. This is the Multiples Choice Questions Part 1 of the Series in Antennas as one of the Communications Engineering topic. 38. Wave front is basically a locus of points acquiring similar. Tags. Derive the radiation field and radiation resistance from a half wave dipole. ._It is used as receiving antenna in portable radio and pagers . Define and explain for ionospheric region i) Critical frequency ii) MUF iii) Skip zone iv) virtual height of a layer. iii. 37. In this array the elements are fed parasitically to reduce the problem of feed line. 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 uniform linear array as the array length is increased to increase the directivity, the secondary lobes also occurs. a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus … B. 88 .Define frequency diversity Reception. Derive the expression for radiation resistance of loop antenna with circumference equal to wavelength. 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. 7. Letan antenna has an impedance of 50 ohms. Explain in detail ionospheric propagation. Eg. 55.Why a short dipole is called a oscillating dipole? List the arrays used for array tapering . _Binomial Array:Tapering follows the coefficient of binomial series ._Dolph Tchebycheff Array: Tapering follows the coefficient of Tchebycheff polynomial. 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, 1 cm – 10 cm c. 10 cm – 1 m d. 0.1 cm – Following is the list of multiple choice questions in this brand new series: MCQ in Radiation and Wave Propagation . i. Curvature of earth. 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. 32. Derive the expression for Permitivity and conductivity of ionized gas.? Far field zone (Fraunhofer zone). 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. C. Omni-directional . iii. The need for a binomial array is i). What is broadside array? The field amplitude due to half wave dipole at 10km is 0.1 V/m. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF. figures / diagrams, tables / values, answers / explanations and more. This preview shows page 1 - 4 out of 31 pages. When these modes re-emerge from the ionosphere they recombine into a single plane wave again. WA = ò ò4p Pn ( q,f ) dW ,Where dW = Sin q d q .df. For a charge moving with uniform velocity with straight & infinite wire, ANSWER: For a charge oscillating in time motion. 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. However, their powe… Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave. Lecture 4 - Practical Machine Learning 1.pptx, Malaviya National Institute of Technology, Jaipur, ECE-VI-ANTENNAS AND PROPAGATION [10EC64]-NOTES, MCQ in Electronics - Wave Propagation And Antenna, Malaviya National Institute of Technology, Jaipur ⢠CSE 306, Visvesvaraya Technological University ⢠ELECTRICAL NA, Sri Sivani College of Engineering ⢠CSE 509, University of Pangasinan ⢠ECE 111005619. (See Figure from John. Waves that arrive at the receiver after reflection in the ionosphere is called sky wave. Page 2/9. ANTENNA and WAVE PROPAGATION Multiple Choice Questions :: 51. 21.Explain the concept of Reflection and refraction wavesby the ionosphere. It is made up of direct wave and ground reflected wave. 35. Loss aperture. Wave propagation is any of the ways in which waves travel. Wave propagation is any of the ways in which waves travel. What is the principle of the pattern multiplication? 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. b. Faraday rotation in Sky wave Propagation. 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. 10.Explain the different techniques used for tapering of arrays. EmoticonEmoticon. 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. Which among the following is/are not present in free space? Explain in detail about the aperture Concept, 3.Briefly explain the radiation from a short dipole. 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. Affect the propagation of a layer length of the array containing two isotropic.... 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