Line: The spine of the antenna used to hold the directors and reflectors and connect to the driven element. C 1.0 km. Reflector: Used to reject signal outside its range as well as amplify what’s inside - think of a mirror reflecting light. 7. An antenna reflector is a device that is reflected in electromagnetic waves. D log-periodic array. Yagi-Uda antenna consists of----- [ ] a) Folded Dipole b) Reflector C) Director d) All above 3. It is made of metal or screen mesh. An antenna array is a radiating system, which consists of individual radiators and elements. l. ASSEMBLY INSTRUCTIONS FOR MOSLEY CUBICAL QUAD MODEL MCQ- 3B The high performance of your MOSLEY Antenna … Which may be used to … 14. It is usually mounted vertically, with the disc at the top and the cone beneath. 2. The driven antenna 1the 3 images have currents of equal magnitude. The maximum range will be proportional to A parabolic reflector antenna is commonly used for satellite communications, radio astronomy, and for various types of radio communication links. Parabolic Reflector Antenna. A. The diameter of the reflector 2. Which conversion mechanism is performed by parabolic reflector antenna? B 1.5 km. B Is less than that of dipole. Wave propagation. Observe how the antenna arrays are connected. 12. Communication Systems MCQ question is the important chapter for a Electrical Engineering and GATE students. A. Reflector Antennas. 48. Verilog programs. FM dipole antenna is used as an FM broadcasting-receiving antenna for the FM broadcast band 88 MHz to 108 MHz. In a Yagi antenna, maximum direction of radiation is toward the a. director b. driven element c. reflector … Assemble the remaining Radiator spreader, coE0r coded red, and the two Reflector spreaders, color code yellow, in the same manner described above and in Fig. 2. MCQ in Basic considerations ; A dipole antenna requires to be fed with 20 kW of power to produce a given signal strength to a particular distant point. ... 40.A form of unwanted radiation working against the main beam caused by feeding a parabolic reflector with an isotropic source. For a transmit antenna with a radiation resistance of 72 ohms, an effective antenna resistance of 8 ohms, a directive gain of 20 and an input power of 100W, determine the antenna … ... Cassegrain feed is used with a parabolic reflector to (A) increase the gain of the system (B) increase the bandwidth of the system ... Computer Science multiple choice questions and answers. When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target. applied to analyze the corner reflector antenna for angle α = 180°/n, where n is any positive integer. i … It is exactly this idea, which led to the invention of Antenna arrays. (18) With a parabolic reflector cassegrain feed is used to (A) Increase the system beam width (B) Increase the system gain (C) Allow the feed to be placed at convenient point (D) Reduce the main reflector size ... (26) Consider a radar having the capture area of receiving antenna A. Excess noise generated. ELECTRONICS 100 IMPORTANT MCQ, electronics mcq, electronics communication objective questions and answers, NTS, PTS, STS April 20, 2020 ELECTRONICS 100 IMPORTANT MCQ's (Part-1) 1. Electromagnetic Field Theory MCQ question is the important chapter for a Electrical Engineering and GATE students. This parabolic reflector antenna is used in conjunction with horn antenna as shown in the figure. This set of Microwave Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Antenna Family”. Antenna reflectors can be a standalone device for redirecting FM energy or can be integrated as part of an antenna concentration. D May be equal, more or less than that of dipole. 15. A Is the same as that of dipole. If the addition of a reflector makes the same field strength available with an input power of ... Antenna and Wave propagation mcq | Part-1 A narrow, antenna-beam width in the vertical plane B. EC8701 AME Syllabus. Hello Friends, In this video , ihave discussed about solution of assignment of last 3 years of week 12 parabolic reflector antenna of subject antenna which falls under NPTEL MOOC course. How does a parabolic reflector provide very high gain ? 1. C pyramidal horn. 11) The type of antenna to be used for producing circularly polarized beams is a) pyramidal horn b) log-periodic array c) paraboloid d) helical antenna 12) In LOS-line of sight propagation systems, to take account of normal refraction, an effective earth radius factor k is used whose value is a) 4/3 b) 4 c) ¾ ... Read more Microwave Engineering MCQ Questions Answers Electronics ECE A discone antenna is a version of a biconical antenna in which one of the cones is replaced by a disc. What is primary radiation and secondary radiation as applicable to parabolic reflector ? Plane to spherical wave B. Spherical to plane wave C. Both a and b D. None of the above Ans: Spherical to plane wave 47. Anna University Regulation 2017 ECE Engineering (ECE) … The calculation results are:. Antenna beamwidth calculator. Aperture area of the feed 4. Flat-plate Reflector Antenna. Yagi uda antenna 4. In the analysis of the 90° corner reflector there are 3 image elements, 2, 3 and 4, located shown in Fig 6.5. C Is more than that of dipole. Enter the diameter of your parabolic dish in m (metres) and the operating frequency in GHz (Gigahertz) A typical VSAT is 1.2m diameter and transmits at 14 - 14.5 GHz. B paraboloid. Define spill over. Rhombic antenna 3. Microwave frequency range is----- [ ] a) above 30MHZ b) above 300MHZ C) above 200MHZ d) above 2000MHZ. If the addition of a reflector makes the same field strength available with an input power of 11kW. If the addition of a reflector makes the same field strength available … Page-5 section-1 Airbus Defence and Space selected L3Harris Technologies to build a space reflector antenna for Thuraya 4-NGS, a next-generation satellite which will provide mobile telecommunication services throughout the Middle East, Africa, Europe, and Central Asia. In addition, undesired interferences are reduced compared to using an omnidirectional antenna because the transmitted signal is directed toward its intended recipient. The noise figure of a receiver is a measure of: 1. D o.5 km ... 28 The type of antenna to be used for producing circularly polarized beams is A helical antenna. What are parasitic elements and where are they used ? In this feed system, primary radiator is put at the opening of vertex of paraboloid reflector B. the secondary feed of the cssegrain system is a hyperboloid reflector whose focus F coincides with focus of the paraboiloid reflector . 10. Antenna and Wave Propagation Pdf notes book starts with the topics covering Antenna Basics, Thin Linear Wire Antennas, Antenna … – 1000+ Multiple Choice Questions & Answers in Antennas with explanations – Every MCQ set focuses on a specific topic in Antennas Subject. Last week, Yahsat chose Airbus to build Thuraya 4-NGS. 8. Director(s): Used to provide the antenna with directional power and gain. 46. Bandwidth of the receiver The horn antenna is an example of an aperture antenna that provides a smooth transition from a waveguide to a larger aperture that couples more effectively into space. Shaped Reflector Antenna; 1.Horn Antenna. What is the reason for using Yagi antenna for TV broadcast reception ? An antenna array can be better understood by observing the following images. The gain of parabolic reflector antenna is proportional to 1. None of these. Dipole antenna 2. Some of the desired rays are not captured by the reflector antenna and this constitute spill over. The section contains questions on reflector antenna basics, flat sheet and corner reflector, parabolic reflector antenna, feeding systems, aperture blockage and parabolic reflector application. The figure depicts a plane reflector antenna type. The antenna gain helps reduce energy consumption when the node actively receives or transmit packets. Electrical Engineering MCQ - English . The total side to side beamwidth of the antenna main beam. A narrow, antenna-beam width in the horizontal plane C. A low repetition rate D. A high duty cycle. Most important and frequently asked multiple choice questions and answers on Antenna and wave propagation. ______is not a microwave tube. Square of the diameter of the reflector 3. Page-6 section-1 Learn Communication Systems MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The phase of … 27. 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