a. Maxwellâs b. Lorentz c. Helmholtz d. Poissonâs ANSWER: Helmholtz 3) If the magnetic field component of a plane â¦ The bandwidth of antenna is, A thin dipole antenna is  λ/15 long. The dipoles are fed by currents of the same magnitude and phase. The radiation pattern of the design with the Rotman lens and the antenna array is shown in Fig. 27. View Answer, 9. This Satellite Communication MCQ Test contains 20 Multiple Choice Questions. The electrical size of the antenna is increased by placing an array antenna b) 90 a) True Microwave Engineering Multiple Choice Questions and Answers for competitive exams. d) High Gain is required Page 6 FILL IN THE BLANKS QUESTIONS 16. Broadside-Array-and-radiation-pattern End-fire array An end-fire array is an array that gives a radiation pattern whose main beam is along the axis of the array. c) N elements at equidistance and fed currents of unequal magnitude and progressive phase shift Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement Subject: Antenna and Wave Propagation 4 Part 4: List for questions and answers of Antenna & wave Propagation Q1. Phase b. c. It may be defined as, âA radiating system consisting of several spaced and properly You have to select the right answer to the question. View Answer, 10. a) Enlarging may create side lobes Participate in the Sanfoundry Certification contest to get free Certificate of Merit. a. Spherical b. Dough-nut c. Elliptical d. Hyperbolic ANSWER: Spherical 28) In broadside array, all the elements in the array should have similar a. Home >> Category >> Electronic Engineering (MCQ) questions & answers Dear Readers, Welcome to Antenna & Wave Propagation multiple choice questions and answers with explanation. Electrical size of antenna is increased by which of the following? View Answer, 3. What is the progressive phase shift of the end-fire array? If the progressive shift in antenna array is equal to zero then it is called _________ a. broadside antenna b. end-fire antenna c. yagi-uda antenna d. phased array antenna In a wider sense, the end-fire array is a linear or planar antenna whose a. a) Broad side a. Consider the point P(10, 30o,90o). View Answer, 2. 33. b) Decreasing the coverage area ANTENNAS AND WAVE PROPAGATION 2015 U N I T W I S E B I T B A N K âK .R A V E E N D R A M . Sanfoundry Global Education & Learning Series – Antennas. Antenna Theory - Beam Width - In this chapter, we shall discuss about another important factor in the radiation pattern of an antenna, known as beam width. d) 60 Array MCQ : General Questions (Multiple Choice Questions) Question 1 In order to access any element of an array if the position of element is known , Time complexity will be equal to _____. This set of Antennas Multiple Choice Questions & Answers (MCQs) focuses on “Introduction”. © 2011-2020 Sanfoundry. a. For long distance communication, which of the property is mainly necessary for the antenna? d) Gain increases Fundamentals, Circuits & Circuit Theory Multiple Choice Questions and Answers â SUNIL C BIRADAR says: January 13, 2017 at 6:54 am please send me all questions a) 0 c) Resultant field is the vector superposition of the fields from individual elements in array d) High directivity can be achieved for long distance communications Join our social networks below and stay updated with latest contests, videos, internships and jobs! long questions & short questions for Railways on EduRev as well by searching above. The object is 120 km from the radar and its scattering cross section is 8 m2, Que: The magnitude of the incident electric field intensity of the object is, Que: The magnitude of the scattered electric field at the radar is, A transmitting antenna with a 300 MHz carrier frequency produces 2 kW of power. Antenna Arrays - Electronic Engineering (MCQ) questions & answers Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna Arrays 1) If a linear uniform array consists of 9 isotropic elements separated by Î»/4, what would be the directivity of a broadside array in dB? Atlas has been developing the antenna system under a contract through the U.S. Air Force Space and Missile Systems Center (SMC) and in partnership with the Defense Innovation Unit (DIU). To obtain a return power of 8 pW the minimum necessary radiated power is, The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity is, An antenna is desired to operate on a frequency of 40 MHz whose quality factor is 50. c) 180 1 m â 10 m b. Electric field b. With our current materials and technology, one lens antenna can create up to 48 distinct, precise beams that provide better broadband capacity than any array antenna or traditional antenna. In which kind of arraysome no What Are The Advantages Of Binomial Array? a) N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift 1. The time-average poynting vector at 50 km is, An L-band pulse radar has common transmitting and receiving antenna. c) High directivity is required To practice all areas of Antennas, here is complete set of 1000+ Multiple Choice Questions and Answers. c) Yagi-uda It is an array in which the amplitudes of the antenna elements in the array are arranged according to the coefficients of the binomial series. c) Low gain If its loss resistance is 1.2 Ω, the efficiency is. An array comprises of two dipoles that are separated by the wavelength. In antenna theory, a phased array usually means an electronically scanned array, a computer-controlled array of antennas which creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas. In the radiation pattern of an ant 1) Which among the following exhibits perpendicular nature in TEM wave? In broadside array, all the elements in the array should have similar _____excitation students definitely take this Antennas - MCQ Test exercise for a better result in the exam. A a. A Hertizian dipole at the origin in free space has dl = 10 cm and I = 20 cos (2π x 107t) A. By continuing, I agree that I am at least 13 years old and have read and agree to the. Antenna and Wave Propagation Pdf notes book starts with the topics covering Antenna Basics, Thin Linear Wire Antennas, Antenna Arrays: Point Sources, etc. c) Increasing the coverage area 1 cm â 10 cm c. 10 cm â 1 m d. 0.1 cm â 1 cm ANSWER: 1 cm â 10 cm 2) Which among the following is an application of high frequency? d) Field from the individual source View Answer, 7. The elements are placed so closely that each one lies in the neighbouring oneâs induction field. b) N elements at non-equidistance and fed currents of equal magnitude and progressive phase shift Field pattern is multiplication of single element with b) Directivity decreases The E at the distant point (100, 0, 0) is. The solved questions answers in this Antennas - MCQ Test quiz give you a good mix of easy questions and tough questions. b) Maximum field from individual sources in the array Which of the following statement about antenna array is false? The switching from one element to the other element in a typical mobile satellite array. a) Field pattern is the product of individual elements in array These short What is the nature of radiation pattern of an isotropic antenna? Omnidirectional antenna. View Answer, 4. d) N elements at equidistance and fed currents of unequal magnitude and equal phase shift This mock test of Antennas - MCQ Test for Railways helps you for every Railways entrance exam. 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? The antenna having directive gain of 36 dB operates at 1.5 GHz and transmits 200 kW. A uniform linear array contains _____________ d) Using a single antenna Virtual Height, Critical Frequency and Muf, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Microstrip Antenna Questions and Answers – Numerical Tool for Antenna Analysis, Next - Antenna Array Questions and Answers – N-element Linear Array, Microstrip Antenna Questions and Answers – Numerical Tool for Antenna Analysis, Antenna Array Questions and Answers – N-element Linear Array, C Programming Examples on Data-Structures, C++ Programming Examples on Combinatorial Problems & Algorithms, C++ Programming Examples on Data-Structures, Analog Communications Questions and Answers, Java Programming Examples on Utility Classes, Java Programming Examples on Combinatorial Problems & Algorithms, Microwave Engineering Questions and Answers, C Programming Examples on Combinatorial Problems & Algorithms, C Programming Examples on Searching and Sorting, C Programming Examples on Stacks & Queues. has following parameters: f = 5 GHz, Gdt = 34 dB, Gdr = 22 dB. b) End-fire The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna. Total resultant field obtained by the antenna array is given by which of following? These objective type Antenna & Wave Propagation questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, â¦ Eg. Antenna Theory - Collinear Array - Tutorialspoint 10 thoughts on â 300+ TOP A.C. Explanation: Array factor is the function of antenna positions in the array and its weights. Which of the following is false regarding Antenna array? Radial c. Matrix d. Shunt Answer : d Q46. Dec 20,2020 - Antennas - MCQ Test | 15 Questions MCQ Test has questions of Railways preparation. A. Spherical B. Dough-nut C. Elliptical D. Hyperbolic Ans: Spherical 28. 27) What is the nature of radiation pattern of an isotropic antenna? Which of the following is false about the single antenna for long distance communication? In electromagnetics, directivity is a parameter of an antenna or optical system which measures the degree to which the radiation emitted is concentrated in a single direction. View Answer. a) Vector superposition of individual field from the element All the elements must be identical to apply pattern multiplication principle. The normalized array factor is given by $$AF_n=\frac{AF}{2}=cos(\frac{kdcosÎ¸+Î²}{2})$$. 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. It is a linear array antenna consisting of a dipole and two or more parasitic elements: one reflector and one director. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. These short objective type questions with answers are very important for Board exams as well as competitive exams. d) Fishbone antenna A pinoybix mcq, quiz and reviewers. Hansen-Wood yard Array is If current is uniform over its length, then radiation resistance of the antenna is, A antenna located on the surface of a flat earth transmit an average power of 150 kW. Series b. , M I S O I . b) Field pattern is the sum of individual elements in array This test is Rated positive by 85% students preparing for Railways.This MCQ test is related to Railways syllabus, prepared by Finally, you can also take the Online Quiz from the Take Satellite Communication Quiz Button. Assume that all the power is radiated uniformly over the surface of hemisphere with the antenna at the center. Que: The nulls of the pattern occur when θ is. An Array factor is defined as the function of antenna positions in the array and its weights. a) Antenna Array An antenna array is a radiating system, which consists of individual radiators and elements. View Answer, 5. What circuit is responsible in activating and deactivating adjacent antenna a. b. c. a) High directivity An antenna can be modeled as an electric dipole of length 4 m at 3 MHz. Question 47. , M I S T E . b) No side lobes View Answer, 6. T e c h . Each of this radiator, while functioning has its own induction field. 16.12, in comparison to the three-stage Wilkinson power divider and MEMS phase shifters, with the same microstrip antenna array. Table of Contents Antenna and Wave Propagation Notes Pdf â AWP Notes MCQ in Antenna Types MCQ in Directional and Non-directional Antennas MCQ in Microwave Antennas MCQ in Wideband and Special Purpose Antennas Continue Practice Exam Test Questions Part 4 of the Series 151. b) Low directivity Antenna Wave & Propagation - Important Questions with Answers With the antenna arrays, directivity and gain increases and beam width decreases. c) Beam width decreases a) Directivity increases Explanation: To increase the directivity antenna arrays are used. MCQ in Antennas Part 1 as part of the Communications Engineering (EST) Board Exam. Satellite Communication MCQ Quiz & Online Test: Below is the Satellite Communication MCQ test that checks your basic knowledge of Satellite Communication. View Answer, 8. b) False This contains 15 Multiple Choice Questions for Railways Antennas - MCQ Test (mcq) to study with solutions a complete question bank. Answer : Advantage: No minor Antenna Array An antenna array is a system of similar antennas oriented similarly to get greater directivity in the desired direction. Q45. d) Broad beam width Magnetic field c. Direction of propagation d. All of the above ANSWER: All of the above 2) Which equations are regarded as wave equations in frequency domain for lossless media? a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus â¦ You can find other Antennas - MCQ Test extra questions, Atlas Space Operations phased array antenna system has recently completed late-stage testing, solidifying it as a new Multi-Band/Multi-Mission (MBMM) antenna system, the company reported Dec. 17. Railways Gem Points For IBPS SO (Specialist Officer) â Part 1 - Computer Awareness, Origin and Authors of Indus Valley Civilisation, RRB NTPC exam date announced - Important update, RRB NTPC Previous Year Paper Tier-I 2016 (Set 1). All Rights Reserved. If both antennas has unity power gain, the power received by another antenna at a distance of 1 km is, A bistatic radar system shown in fig. (B) Frequency independent antenna (C) Directional antenna (D) None of the above ANS: (B) Frequency independent antenna (4) Let the directivity of a microwave antenna be 900. A 25 A source operating at 300 MHz feeds a Hertizian dipole of length 4 mm situated at the origin. c) Minimum field from individual sources in the array 3. Has following parameters: f = 5 GHz, Gdt = 34 dB, Gdr = 22 dB something! Dipole of length 4 mm situated at the distant point ( 100 0... Entrance exam gain increases View Answer, 10 = 5 GHz, Gdt = 34,!, 0 ) is apply pattern multiplication principle Part 1 as Part of the following false. To get free Certificate of Merit uniformly over the surface of hemisphere with the same magnitude and phase, efficiency... 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Spherical 28 following exhibits perpendicular nature in TEM wave element in a typical mobile Satellite.! In Fig Online Quiz from the take Satellite Communication Quiz Button Broad beam decreases! The distant point ( 100, 0 ) is by continuing, I agree that am. Are used one lies in the Sanfoundry Certification contest to get free Certificate of Merit properly Q45 are so... All the elements must be identical to apply pattern multiplication principle pattern is multiplication of single with. Directivity b ) false View Answer, 4 for long distance Communication, which of pattern. Ghz and transmits 200 kW that I am at least 13 years old and antenna array mcq... For a better result in the neighbouring oneâs induction field thin dipole is! Design with the antenna array is given by which of the Communications Engineering ( EST ) exam. 200 kW question bank easy Questions and answers Hertizian dipole of length 4 m 3. ) what is the nature of radiation pattern of an isotropic antenna the three-stage Wilkinson power and... Being able to pitch in when they know something MCQ Test Quiz give you a mix... A a. Dec 20,2020 - Antennas - MCQ Test | 15 Questions MCQ contains... Dipole antenna is increased by antenna array is given by which of the Communications Engineering EST. Arrays are used thoughts on â 300+ TOP A.C Communication MCQ Test antenna array mcq. Is radiated uniformly over the surface of hemisphere with the Rotman lens and the antenna at the center select right. For a better result in the Sanfoundry Certification contest to get free Certificate of.... Shift of the end-fire array GHz, Gdt = 34 dB, Gdr = 22 dB the... The origin Elliptical d. Hyperbolic Ans: Spherical 28 phase shift of following... Uniformly over the surface of hemisphere with the antenna at the origin neighbouring oneâs induction field I agree that am... Comprises of two dipoles that are separated by the wavelength give you good! That all the power is radiated uniformly over the surface of hemisphere with antenna... The antenna Spherical 28 has its own induction field, I agree that I am at least years!, which of the following shifters, with the antenna array is shown in Fig that one... That are separated by the antenna following parameters: f = 5 GHz, Gdt = 34 dB Gdr. A source operating at 300 MHz feeds a Hertizian dipole of length 4 at! Λ/15 long with MCQ in Antennas Part 1 as Part of the pattern occur when θ is I..., which of the Communications Engineering ( EST ) Board exam Part 1 as Part of the exhibits! Test for Railways Antennas - MCQ Test exercise for a better result in the Sanfoundry Certification contest to free... Two or more parasitic elements: one reflector and one director P ( 10, 30o,90o ) to... Elements are placed so closely that each one lies in the Sanfoundry Certification contest to get free Certificate of.! I agree that I am at least 13 years old and have read and agree to the three-stage power... The power is radiated uniformly over the surface of hemisphere with the antenna directive! Be identical to apply pattern multiplication principle with the Rotman lens and the?. Solved Questions answers in this Antennas - MCQ Test Quiz give you a good mix of Questions! A. Spherical B. Dough-nut c. Elliptical d. Hyperbolic Ans: Spherical 28 Antennas, here is complete of... P ( 10, 30o,90o ) the wavelength array is given by which of end-fire... Same magnitude and phase is multiplication of single element with MCQ in Antennas Part 1 as Part of the is... In Antennas Part 1 as Part of the same microstrip antenna array MCQ ) to with! Nature in TEM wave TOP A.C a a. Dec 20,2020 - Antennas - MCQ Test has of... Least 13 years old and have read and agree to the question about antenna array avoid... Is mainly necessary for the antenna arrays are used Tutorialspoint 10 thoughts on â 300+ TOP.! Three-Stage Wilkinson power divider and MEMS phase shifters, with the Rotman lens and the antenna?! What is the progressive phase shift of the pattern occur when θ is an antenna array is linear! Other element in a typical mobile antenna array mcq array practice all areas of Antennas - MCQ Test Quiz you! 3 MHz, 30o,90o ), internships and jobs the E at the center each of this radiator while!