40) By which name/s is an ionospheric propagation, also known as? Ground wave propagation c. Sky wave propagation d. All of the above. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. The index refraction of the glass is, 86. 41) According to Snell’s law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal? Line of sight communications is not a factor in which frequency range? Antenna And Wave Propagation Multiple Choice Questions And. 98. a. The radio waves of frequency 300 MHz to 3000 MHz belong to. 3. Energy Loss in ionosphere. The sky waves as radiated towards the sky that are either reflected or refracted back to Earth by the ionosphere. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. The ionosphere is a region of the upper atmosphere, from about 80 km to 1000 km in altitude, where … A pinoybix mcq, quiz and reviewers. Also explore over 6 similar quizzes in this category. These MCQs are very useful for other competitive exams like UPSEE 2020, JEE Main 2020, WBJEE 2020 etc. MCQs on Radio Wave Propagation for NEET Radio waves are the waves having the longest wavelength in the electromagnetic spectrum. When the light ray approaches a glass-air interface from the glass side at the critical angle, the angle of refraction is, 80. The best solution seems to be the use of, 57. Give it a try and share your score. MCQ in Radiation and Wave Propagation Part 2 | ECE Board Exam. a. 10MHz and above it may only extend for a mile or two. Following is the list of multiple choice questions in this brand new series: P Energy Loss in ionosphere. A TV tower has a height of 100 m. So, the power radiated by antenna will remain unchanged. At MF it may extend as far as 100 miles or so, but for higher frequencies, e.g. The ionosphere is responsible for, d. The ability of satellites to orbit the earth, 69. An antenna is an electrical conductor or system of conductors. C. Severe attenuation of signals on the 10 meter band. UNIT VIII Wave Propagation – II: Antenna and wave propagation pdf; Sky Wave Propagation — Introduction. MCQ in Radiation and Wave Propagation Part 1 as part of the Communications Engineering (EST) Board Exam. If both the length of an antenna and the wave length of the signal to be transmitted are doubled, the power radiated by the antenna. A Skywave Propagation: The electromagnetic waves emitted by transmitting antenna are received after being reflected from the ionosphere are called sky waves and this type of propagation is called Sky wave Propagation. Wave propagation is any of the ways in which waves travel. 75. Professionals, Teachers, Students and Kids Trivia Quizzes to … At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. Q8. D. … 97. Top Ranking CBSE Sample Paper Books for 2021 Boards. The skywave propagation occurs due to the total internal reflection of the electromagnetic waves by the ionosphere. 96. Sea wave propagation B. A. The angle of refraction is 60 degrees. Learn important MCQs (with solutions) for CBSE Class 12th Physics Board Exam 2020 (Chapter 15 - Communication Systems). At such higher frequencies the other wave propagation techniques like sky wave propagation, ground wave propagation can’t work. The solid angle subtended by a hemisphere about its center is, d. depends on the radius of the hemisphere, 89. 100 TOP ANTENNA And WAVE PROPAGATION Objective Questions. A carrier wave is modulated by n number of sine waves with modulation indices μ1, μ2, μ3…. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. Dispersion is the term used to describe, a. Basically the technique of space wave propagation is used in bands having very high frequencies. It consists of several layers of charged … Menu. If the transmitter power remains constant, an increase in the frequency of the sky wave will . 40. Transducer is a device used for converting a one form of energy into another. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. Hence, it is an example of broadcasting. V.H.F. The minimum transmission distance is. ANSWER: Sky wave propagation. In this video, i have explained Sky Wave Propagation by following outlines:1. 76. Based on that, it can be classified as: 1. New Post! The ionosphere is a region of ionized gas in the upper atmosphere. The luminous flux emitted by a 60-cd isotropic light source is concentrated on an area of 0.5 m2. Ground Wave Propagation - Electronic Engineering (MCQ) questions & answers. 2 MHz to 30 MHz frequencies are propagating through the sky waves. Space (Tropospheric) waves 3. Ground wave propagation C. Sky wave propagation D. All of the above Ans: Sky wave propagation 41. signals transmission is either space wave propagation, i.e., line of sight propagation or satellite communication. the distance between the far end of the ground wave and where the refracted wave first returns to earth. An underwater swimmer shines a flash light beam upward at an angle of incidence of 40 degrees. The maximum distance between them for satisfactory communication in line of sight mode is: This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. In an electromagnetic wave the electric field is, a. A method of propagation that uses sky wave. 63. the absorption of a radio waves by the atmosphere depends on, a. is caused by reflections from the ground, b. arises only with spherical wave fronts, c. will occur when the waves pass through a large slot, d. may occur around the edge of a sharp object, 65. Long skip sky-wave propagation on the 10 meter band. Sky Wave Propagation2. 2. This is the Multiple Choice Questions in Chapter 15: Radio-Wave Propagation from the book Electronic Communication Systems by Roy Blake. a. lengthen the skip distance . 7) After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation? Sky (Ionospheric) waves. Before we discuss different modes of wave propagation, let us see the allocation of frequencies for broadcasting. Here the waves are shown to be transmitted from one place and where it is received by many receivers. Towards B. This is the Multiples Choice Questions Part 2 of the Series in Radiation and Wave Propagation as one of the Communications Engineering topic. Trans- mission can be received (Radius of earth = 8 X 106 m)? NEET Physics is the scoring paper in the medical entrance examination. b. increase the range of the ground wave . A light ray enters one medium from another along the normal. quiz which has been attempted 1361 times by avid quiz takers. B. 93. A 'skip zone' is: the distance between the antenna and where the refracted wave first returns to earth. The receiving antenna is 200ft high. CBSE Sample Papers 2020 for 10th & 12th with Answers & Marking Schemes: All Subjects, NCERT Exemplar Solutions for CBSE Class 12 Physics. Sky and it is again reflected back by the ionosphere is responsible for, the. The following is a good indicator of the most trusted Engineering review sites helping thousands of engineers... 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