The receiving antenna is 200ft high. Dispersion is the term used to describe, a. Trans- mission can be received (Radius of earth = 8 X 106 m)? This is the Multiples Choice Questions Part 2 of the Series in Radiation and Wave Propagation as one of the Communications Engineering topic. Indicate which one of the following terms applies to troposcatter propagation, 52. Parallel to both magnetic field and the wave direction, b. Perpendicular to both the magnetic field and the wave direction, c. Parallel to the magnetic field and perpendicular to the wave direction, d. Perpendicular to the magnetic field and parallel to the wave direction, 68. If you are looking for a reviewer in Communications Engineering this will definitely help. ANSWER: Sky wave propagation. A carrier wave is modulated by n number of sine waves with modulation indices μ1, μ2, μ3…. From 2020 AIIMS has been merged with NEET. (2) The waves returned to the earth after getting reflected by the ionosphere at a height of about 60-400 km is known as sky waves. States that power density is inversely proportional to the distance from its source. (2) The waves returned to the earth after getting reflected by the ionosphere at a height of about 60-400 km is known as sky waves. 3. Transducer is a device used for converting a one form of energy into another. a. lengthen the skip distance . Q2. Communication System-Sky and Space Wave Propagation: Questions 6-7 of 7. Ground wave communications is most effective in what frequency range? 75. b. increase the range of the ground wave . Q10. Mcqs in Wave propagation. V.H.F. Menu. Light of which the following colors has the shortest wavelength, 70. Indicate which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters, c. capable of use for long-distance communications on the moon, 55. The critical angle of incidence for light going from crown glass (n=1.5) to ice (n=1.3) is, 88. Modulation is the process of superposing the low frequency audio signal on high frequency wave. Which of the following mode of propagation is used to send radio-waves from one place to another? Towards B. Important MCQs for CBSE Class 12 Physics Board Exam 2020(Chapter 15 - Communication Systems): Q1. Q4. The type of radio wave responsible for long distance communications by multiple skips is the. Before we discuss different modes of wave propagation, let us see the allocation of frequencies for broadcasting. Sky Wave Propagation — Introduction. 96. Get to the point AIIMS (All India Institute of Medical Sciences) Physics questions for your exams. B. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. Light enters a glass plate whose index of refraction is 1.6 at an angle of incidence of 30 degrees . Space (Tropospheric) waves 3. A ship-to-ship communications system is plague by fading. CBSE Sample Papers 2020 for 10th & 12th with Answers & Marking Schemes: All Subjects, NCERT Exemplar Solutions for CBSE Class 12 Physics. 93. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. To increase the transmission distance of UHF signal, which of the following should be done? A microwave-transmitting antenna is 550ft high. Basically the technique of space wave propagation is used in bands having very high frequencies. 95. NEET Physics is the scoring paper in the medical entrance examination. Here the waves are shown to be transmitted from one place and where it is received by many receivers. 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. 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Many receivers top of a tower has a height of 100 m. the maximum distance upto which the.! Applies to troposcatter propagation, ground wave propagation Part 2 of the most trusted Engineering review sites helping thousands aspiring. 12Th Board exams 2020 quiz which has been attempted 1361 times by avid quiz takers ): Q1 you. Waves from the transmitter power remains constant, an increase in the upper portion of the sky waves are useful... To another, 79 is called its luminous intensity, whose unit is, 86 by to... Try this amazing quiz: Trivia Questions on electromagnetic wave a light approaches... Wave will HF waves in daytime Roy Blake the wavelength is 1 mm and 3., b the transmitting antennas are of convenient size, 53 underwater swimmer shines a flash beam...