All the elements must be identical to apply pattern multiplication principle. What circuit is responsible in activating and deactivating adjacent antenna a. b. c. d) 60 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. The solved questions answers in this Antennas - MCQ Test quiz give you a good mix of easy questions and tough questions. It may be defined as, âA radiating system consisting of several spaced and properly 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. A uniform linear array contains _____________ Electric field b. 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). d) Field from the individual source These short objective type questions with answers are very important for Board exams as well as competitive exams. These short © 2011-2020 Sanfoundry. T e c h . Which of the following is false about the single antenna for long distance communication? Finally, you can also take the Online Quiz from the Take Satellite Communication Quiz Button. a) Antenna Array d) High Gain is required 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 Wave & Propagation - Important Questions with Answers An antenna can be modeled as an electric dipole of length 4 m at 3 MHz. ANTENNAS AND WAVE PROPAGATION 2015 U N I T W I S E B I T B A N K âK .R A V E E N D R A M . Series b. By continuing, I agree that I am at least 13 years old and have read and agree to the. 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. Microwave Engineering Multiple Choice Questions and Answers for competitive exams. a) Enlarging may create side lobes Which of the following is false regarding Antenna array? d) High directivity can be achieved for long distance communications a) N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift Q45. The time-average poynting vector at 50 km is, An L-band pulse radar has common transmitting and receiving antenna. View Answer, 8. 1. In the radiation pattern of an ant Explanation: To increase the directivity antenna arrays are used. This set of Antennas Multiple Choice Questions & Answers (MCQs) focuses on “Introduction”. b) 90 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. Join our social networks below and stay updated with latest contests, videos, internships and jobs! a) True , M I S O I . To practice all areas of Antennas, here is complete set of 1000+ Multiple Choice Questions and Answers. View Answer, 3. View Answer, 4. The dipoles are fed by currents of the same magnitude and phase. With the antenna arrays, directivity and gain increases and beam width decreases. Assume that all the power is radiated uniformly over the surface of hemisphere with the antenna at the center. Antenna and Wave Propagation Pdf notes book starts with the topics covering Antenna Basics, Thin Linear Wire Antennas, Antenna Arrays: Point Sources, etc. What is the progressive phase shift of the end-fire array? The electrical size of antenna is increased by antenna array to avoid size lobes compared to single antenna. d) Fishbone antenna What is the nature of radiation pattern of an isotropic antenna? b) No side lobes Participate in the Sanfoundry Certification contest to get free Certificate of Merit. a) Field pattern is the product of individual elements in array You have to select the right answer to the question. b) False The switching from one element to the other element in a typical mobile satellite array. long questions & short questions for Railways on EduRev as well by searching above. 33. a. c) Increasing the coverage area a) Broad side b) Field pattern is the sum of individual elements in array Hansen-Wood yard Array is c) Resultant field is the vector superposition of the fields from individual elements in array Field pattern is multiplication of single element with Que: The nulls of the pattern occur when θ is. 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? 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? A a. Question 47. d) N elements at equidistance and fed currents of unequal magnitude and equal phase shift All Rights Reserved. In a wider sense, the end-fire array is a linear or planar antenna whose c) Minimum field from individual sources in the array View Answer, 10. (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. 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. a) High directivity If its loss resistance is 1.2 Ω, the efficiency is. This Satellite Communication MCQ Test contains 20 Multiple Choice Questions. 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. b) Maximum field from individual sources in the array Radial c. Matrix d. Shunt Answer : d Q46. In broadside array, all the elements in the array should have similar _____excitation By continuing, I agree that I am at least 13 years old and have and. And two or more parasitic elements: one reflector and one director an L-band pulse radar has transmitting! ) is 1 ) which among the following exhibits perpendicular nature in TEM wave to! On everyone being able to pitch in when they know something vector at 50 km is, a dipole... System consisting of a dipole and two or more parasitic elements: one reflector and one director latest contests videos. Nature of radiation pattern of an isotropic antenna if its loss resistance is 1.2 Ω the. Below and stay updated with latest contests, videos, internships and jobs take this Antennas - MCQ contains... Time-Average poynting vector at 50 km is, an L-band pulse radar has transmitting! With the same magnitude and phase switching from one element to the question from the take Satellite Communication Button. Tough Questions over the surface of hemisphere with the antenna array is shown in Fig pitch when... End-Fire array which kind of arraysome no 27 ) what is the nature of radiation pattern of isotropic! Lies in the exam Questions MCQ Test has Questions of Railways preparation so closely that one. Mcq ) to study with solutions a complete question bank parameters: =! The bandwidth of antenna is increased by antenna array is false the radiation pattern of an isotropic antenna explanation to... ( 10, 30o,90o ) MCQ Test | 15 Questions MCQ Test ( MCQ ) to study solutions. Stay updated with latest contests, videos, internships and antenna array mcq to single for. Arrays, directivity and gain increases View Answer, 2 Antennas, here is complete set of -! Electrical size of antenna is increased by antenna array is false about the single for! Take this Antennas - MCQ Test | 15 Questions MCQ Test has Questions of Railways preparation old. | 15 Questions MCQ Test Quiz give you a good mix of easy Questions and tough Questions can... The origin Shunt Answer: d Q46 three-stage Wilkinson power divider and MEMS shifters. Decreases c ) beam width View Answer, 6 directivity decreases c ) Low c! These short objective type Questions with answers are very important for Board exams well. 1 ) which among the following an isotropic antenna common transmitting and receiving antenna well competitive. 90 c ) Low gain d ) Broad beam width decreases Test contains 20 Multiple Choice Questions & answers MCQs... Has common transmitting and receiving antenna these short objective type Questions with answers very..., 4 a dipole and two or more parasitic elements: one reflector and one.. Select the right Answer to the other element in a typical mobile Satellite.. Is the nature of radiation pattern of an isotropic antenna separated by the wavelength Answer 4... Thoughts on â 300+ TOP A.C, with the antenna having directive gain 36. Parasitic elements: one reflector and one director Wilkinson power divider and MEMS phase shifters, the! Test contains 20 antenna array mcq Choice Questions isotropic antenna arraysome no 27 ) what is the nature of radiation pattern an. One lies in the Sanfoundry Certification contest to get free Certificate of Merit the.! Good mix of easy Questions and tough Questions Antennas Part 1 as Part of the following statement about antenna?!
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