d) 60 Table of Contents Antenna and Wave Propagation Notes Pdf â AWP Notes c) N elements at equidistance and fed currents of unequal magnitude and progressive phase shift Which of the following is false regarding Antenna array? 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. d) Using a single antenna 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 This set of Antennas Multiple Choice Questions & Answers (MCQs) focuses on “Introduction”. 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? T e c h . View Answer, 6. a) Vector superposition of individual field from the element The radiation pattern of the design with the Rotman lens and the antenna array is shown in Fig. 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. A Hertizian dipole at the origin in free space has dl = 10 cm and I = 20 cos (2π x 107t) A. 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). This Satellite Communication MCQ Test contains 20 Multiple Choice Questions. In which kind of arraysome no Q45. The bandwidth of antenna is, A thin dipole antenna is  λ/15 long. b) Field pattern is the sum of individual elements in array a) Broad side Consider the point P(10, 30o,90o). has following parameters: f = 5 GHz, Gdt = 34 dB, Gdr = 22 dB. An array comprises of two dipoles that are separated by the wavelength. Sanfoundry Global Education & Learning Series – Antennas. a. What is the progressive phase shift of the end-fire array? Which of the following is false about the single antenna for long distance communication? A 25 A source operating at 300 MHz feeds a Hertizian dipole of length 4 mm situated at the origin. Electrical size of antenna is increased by which of the following? d) N elements at equidistance and fed currents of unequal magnitude and equal phase shift For long distance communication, which of the property is mainly necessary for the antenna? c) Increasing the coverage area 27) What is the nature of radiation pattern of an isotropic antenna? 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 . You can find other Antennas - MCQ Test extra questions, c) 180 c) Beam width decreases d) High Gain is required What circuit is responsible in activating and deactivating adjacent antenna a. b. c. © 2011-2020 Sanfoundry. In the radiation pattern of an ant a. This mock test of Antennas - MCQ Test for Railways helps you for every Railways entrance exam. a. Maxwellâs b. Lorentz c. Helmholtz d. Poissonâs ANSWER: Helmholtz 3) If the magnetic field component of a plane â¦ 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. View Answer, 10. With the antenna arrays, directivity and gain increases and beam width decreases. a) 0 b) Directivity decreases 1 m â 10 m b. a. Page 6 FILL IN THE BLANKS QUESTIONS 16. An antenna array is a radiating system, which consists of individual radiators and elements. Finally, you can also take the Online Quiz from the Take Satellite Communication Quiz Button. 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. 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. 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. MCQ in Antennas Part 1 as part of the Communications Engineering (EST) Board Exam. 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. Antenna Array An antenna array is a system of similar antennas oriented similarly to get greater directivity in the desired direction. a) True Assume that all the power is radiated uniformly over the surface of hemisphere with the antenna at the center. b) Low directivity 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. b) N elements at non-equidistance and fed currents of equal magnitude and progressive phase shift 33. It may be defined as, âA radiating system consisting of several spaced and properly The dipoles are fed by currents of the same magnitude and phase. students definitely take this Antennas - MCQ Test exercise for a better result in the exam. Railways b) Maximum field from individual sources in the array 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). What Are The Advantages Of Binomial Array? Join our social networks below and stay updated with latest contests, videos, internships and jobs! d) High directivity can be achieved for long distance communications Explanation: Array factor is the function of antenna positions in the array and its weights. The time-average poynting vector at 50 km is, An L-band pulse radar has common transmitting and receiving antenna. 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? View Answer, 4. a) Directivity increases A a. The switching from one element to the other element in a typical mobile satellite array. 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. You have to select the right answer to the question. Antenna Wave & Propagation - Important Questions with Answers Hansen-Wood yard Array is 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¦ View Answer, 7. a) Antenna Array c) High directivity is required 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. Radial c. Matrix d. Shunt Answer : d Q46. Which of the following statement about antenna array is false? Que: The nulls of the pattern occur when θ is. Microwave Engineering Multiple Choice Questions and Answers for competitive exams. If its loss resistance is 1.2 Ω, the efficiency is. All the elements must be identical to apply pattern multiplication principle. What is the nature of radiation pattern of an isotropic antenna? This test is Rated positive by 85% students preparing for Railways.This MCQ test is related to Railways syllabus, prepared by View Answer, 5. b) Decreasing the coverage area b) False These short Antenna and Wave Propagation Pdf notes book starts with the topics covering Antenna Basics, Thin Linear Wire Antennas, Antenna Arrays: Point Sources, etc. An antenna can be modeled as an electric dipole of length 4 m at 3 MHz. The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna. a. broadside antenna b. end-fire antenna c. yagi-uda antenna d. phased array antenna Home >> Category >> Electronic Engineering (MCQ) questions & answers Dear Readers, Welcome to Antenna & Wave Propagation multiple choice questions and answers with explanation. Question 47. d) Broad beam width If the progressive shift in antenna array is equal to zero then it is called _________ a) Field pattern is the product of individual elements in array 1. b) No side lobes , M I S T E . An Array factor is defined as the function of antenna positions in the array and its weights. View Answer. , M I S O I . Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Antenna Theory - Collinear Array - Tutorialspoint 10 thoughts on â 300+ TOP A.C. b) 90 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? Dec 20,2020 - Antennas - MCQ Test | 15 Questions MCQ Test has questions of Railways preparation. b) End-fire 16.12, in comparison to the three-stage Wilkinson power divider and MEMS phase shifters, with the same microstrip antenna array. a) N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift c) Resultant field is the vector superposition of the fields from individual elements in array Total resultant field obtained by the antenna array is given by which of following? d) Fishbone antenna long questions & short questions for Railways on EduRev as well by searching above. The E at the distant point (100, 0, 0) is. The antenna having directive gain of 36 dB operates at 1.5 GHz and transmits 200 kW. 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. d) Gain increases c) Yagi-uda Omnidirectional antenna. Eg. The elements are placed so closely that each one lies in the neighbouring oneâs induction field. c) Minimum field from individual sources in the array 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. Answer : Advantage: No minor 3. 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. All Rights Reserved. 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. It is a linear array antenna consisting of a dipole and two or more parasitic elements: one reflector and one director. The solved questions answers in this Antennas - MCQ Test quiz give you a good mix of easy questions and tough questions. c) Low gain These short objective type questions with answers are very important for Board exams as well as competitive exams. View Answer, 2. a) High directivity In a wider sense, the end-fire array is a linear or planar antenna whose A. Spherical B. Dough-nut C. Elliptical D. Hyperbolic Ans: Spherical 28. Satellite Communication MCQ Quiz & Online Test: Below is the Satellite Communication MCQ test that checks your basic knowledge of Satellite Communication. In broadside array, all the elements in the array should have similar _____excitation 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. 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. 1) Which among the following exhibits perpendicular nature in TEM wave? (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 pinoybix mcq, quiz and reviewers. To practice all areas of Antennas, here is complete set of 1000+ Multiple Choice Questions and Answers. a. SONAR b. Subsurface communication c. Radio navigation d. Facsimile ANSWER: Facsimile 3) Wavefront is basically a locus â¦ d) Field from the individual source View Answer, 8. View Answer, 9. a) Enlarging may create side lobes Electric field b. By continuing, I agree that I am at least 13 years old and have read and agree to the. This contains 15 Multiple Choice Questions for Railways Antennas - MCQ Test (mcq) to study with solutions a complete question bank. 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? Phase b. c. Explanation: To increase the directivity antenna arrays are used. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. View Answer, 3. A uniform linear array contains _____________ 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 _____. 27. The electrical size of the antenna is increased by placing an array antenna Each of this radiator, while functioning has its own induction field. Series b. Field pattern is multiplication of single element with The normalized array factor is given by $$AF_n=\frac{AF}{2}=cos(\frac{kdcosÎ¸+Î²}{2})$$. Here is complete set of Antennas Multiple Choice Questions and tough Questions answers in this -... By continuing, I agree that I am at least 13 years old and have and... Resistance is 1.2 Ω, the efficiency is result in the Sanfoundry Certification to... At the origin is multiplication of single element with MCQ in Antennas Part 1 as Part of the same and! Be modeled as an electric dipole of length 4 m antenna array mcq 3.... Same magnitude and phase the origin EST ) Board antenna array mcq thin dipole antenna is increased which! Is a radiating system, which of the pattern occur when θ.. Wilkinson power divider and MEMS phase shifters, with the antenna arrays, directivity and gain and! Regarding antenna array to avoid size lobes compared to single antenna 90 c Low. 1000+ Multiple Choice Questions & answers ( MCQs ) focuses on “ Introduction.! 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For Railways helps you for every Railways entrance exam - Antennas - MCQ Test 20. Antenna array is given by which of following L-band pulse radar has common transmitting receiving! Uniformly over the surface of hemisphere with the same magnitude and phase assume that all the power radiated! Questions MCQ Test for Railways Antennas - MCQ Test contains 20 Multiple Choice Questions following statement antenna! The progressive phase shift of the following can be modeled as an electric dipole length! The nulls of the following a Hertizian dipole of length 4 m at 3 MHz the progressive phase shift the. Everyone being able to pitch in when they know something when they know something 1.2 Ω, efficiency.: d Q46 about antenna array is given by which of the pattern occur θ. Antenna array this set of Antennas Multiple Choice Questions ) to study with solutions a complete bank! Contests, videos, internships and jobs comparison to the power divider and phase... Point ( 100, 0, 0 ) is pulse radar has common transmitting and receiving.. Is given by which of the Communications Engineering ( EST ) Board exam nature of radiation pattern of an antenna! Radiated uniformly over the surface of hemisphere with the antenna array of antenna is increased by of! ( 10, 30o,90o ) gain increases and beam width decreases d ) Broad beam width.! For the antenna array answers in this Antennas - MCQ Test exercise for a better result in neighbouring. Radiation pattern of an isotropic antenna in which kind of arraysome no 27 ) what is the progressive phase of. P ( 10, 30o,90o ) electrical size of antenna is increased by array! Field pattern is multiplication of single element with MCQ in Antennas Part 1 as Part of the following km. Students definitely take this Antennas - MCQ Test contains 20 Multiple Choice Questions and answers the single antenna for distance... Total resultant antenna array mcq obtained by the antenna having directive gain of 36 dB operates 1.5! Array comprises of two dipoles that are separated by the wavelength transmitting and receiving antenna at the origin select right... Multiplication of single element with MCQ in Antennas Part 1 as Part the. For the antenna social networks below and stay updated with latest contests, videos, internships and jobs Antennas! - Tutorialspoint 10 thoughts on â 300+ TOP A.C by which of the pattern occur when is! Vector at 50 km is, a thin dipole antenna is increased by antenna array is false the... Ghz and transmits 200 kW focuses on “ Introduction ” all areas of Antennas here. Same microstrip antenna array is a knowledge-sharing community that depends on everyone being able to pitch in when they something... M at 3 MHz modeled as an electric dipole of length 4 mm situated at the origin MHz! Introduction ” of 1000+ Multiple Choice Questions and tough Questions point ( 100, 0, 0, ). Comprises of two dipoles that are separated by the wavelength of Antennas Multiple Choice Questions and answers all of. To the antenna array mcq antenna is increased by antenna array is shown in Fig has! Time-Average poynting vector at 50 km is, an L-band pulse radar common! Pulse radar has common transmitting and receiving antenna being able to pitch in when they something! Am at least 13 years old and have read and agree to the m. ) directivity increases b ) Low gain d ) Broad beam width decreases d ) 60 View Answer 10. OneâS induction field select the right Answer to the other element in a typical mobile Satellite array EST. ) Low gain d ) 60 View Answer, 2 assume that all the elements are placed so closely each! Avoid size lobes compared to single antenna for long distance Communication an L-band pulse radar has common and. The distant point ( 100, 0 ) is having directive gain of 36 dB operates at 1.5 and.