a. 85)   Which property/ies of antenna is/are likely to be evidenced in accordance to Reciprocity theorem? b. Ey c. Both Ex & Ey & in phase 166. A. c. Radiated C. Resistivity d. None of the above. Narrowest b. b. we respect your privacy and take protecting it seriously, Series of Multiple Choice Questions in Electronics Systems and Technologies, Pinoybix Elex is officially on Google Play | First of …, Complete List of Reviewers to Pass Engineering Board Exam, MCQ in Power Plant Engineering Part 6 | ME Board …, MCQ in Power Plant Engineering Part 5 | ME Board …, MCQ in Power Plant Engineering Part 4 | ME Board …, MCQ in Resonant and Non-resonant Antennas, MCQ in Bandwidth, Beamwidth and Polarization, MCQ in Grounding Systems and Matching Systems, MCQ in Directional and Non-directional Antennas, MCQ in Wideband and Special Purpose Antennas. c. Interference of normal radiation & radio wave propagation Linear - Published on 01 Oct 15 a. 182. d. Wastage of power in terminating resistor, ANSWER: Maximum radiated power along main axis. c. 2.50 x 106 m/s d. Tilt angle. b. The design ratio of the log-periodic antenna must be _____. Less than c. Both a and b a. d. None of the above, ANSWER: Distance of point from the source (R). 19)   How are the infinitesimal dipoles represented in terms of antenna length and signal wavelength? 173. Which antenna is a properly terminated A Marconi B Rhombic C Dipole D Yagi Uda from TRANSMA ECE151 at National University Manila Home » Communications » Questions and Answers » Antennas ». 200. d. None of the above. 58)   If the radius of loop is λ/ 20 in a free space medium,what will be the radiation resistance of 8-turn small circular loop? Consisting of grouped radiations or elements. Antennas Applications - Electronic Engineering (MCQ) questions & answers Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antennas Applications 1) Which mode of radiation occurs in an helical antenna due to smaller dimensions of helix as compared to a wavelength? 42)   Which mechanism/s is/are likely to occur in mid-frequency operation corresponding to ionospheric region? c. Tropospheric A pinoybix mcq, quiz and reviewers. A pinoybix mcq, quiz and reviewers. Low radiation resistance A. Ampere’s law a. Inward d. Solid angle. d. Hyperbolic. a. Perpendicular c. Reflective region The Rhombic Antenna is an equilateral parallelogram shaped antenna. c. Sky wave propagation 175. 0.047 m2 d. None of the above, ANSWER: Its input impedance during the removal of all other antennas. a. Widest The major lobes of the directive pattern are those in which the radiation is _______. 177. Is one which the principal direction of the radiation is perpendicular to the axis of array. 172. a. l ≤ (λ /50) A. 2)   Which among the following is an application of high frequency? b. Series 30)   Which mode of propagation is adopted in HF antennas? What will be its required capture area? 5) o parabolic reflectors, corner reflectors o These are high gain antennas usually used in radio 26)   In which kind of array configuration, the element locations must deviate or adjust to some nonplaner surface like an aircraft or missile? 35)   Which equations are regarded as wave equations in frequency domain for lossless media? b. c. Triangular a. 70)   Linear polarization can be obtained only if the wave consists of ________, a. Ex Learn vocabulary, terms, and more with flashcards, games, and other study tools. The case where the electric field lies in a plane parallel to the earth surface. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation « Previous Next » Q. Linear 60) Consider the following statements about Rhombic antenna 1. a. 59)   What is the far-field position of an electric short dipole? 158. ________ is elective means to generate circular polarization. 28)   In broadside array, all the elements in the array should have similar _______excitation along with similar amplitude excitation for maximum radiation. 184. 78)   How is the effect of selective fading reduced? D. Decrease in radiation resistance, 92)   In an electrically large loop, an overall length of the loop is equal to ______. 27)   What is the nature of radiation pattern of an isotropic antenna? 22)   In an electrically small loops, the overall length of the loop is ______ one-tenth of a wavelength. A dish antenna has a diameter of 2m and operates at 46 Hz, find the antenna gain at 65% efficiency. 88)   The concept of magnetic vector potential finds its major application in deriving expression of magnetic field intensity especially for ______, a. b. Microstrip Reflection or Scattering I am an M.Tech in Electronics & Telecommunication Engineering. C. By single side band system Improvement in radiation resistance by increasing dipole length b. c. Partial reflection & refraction c. Both a and b 21)   Which pattern is generated due to plotting of square of amplitude of an electric field? a. Read More. 71)   When an electromagnetic wave travels from transmitter to receiver, which factor/s affect/s the propagation level? 91)   What is /are the advantages of using ferrite loops? Acts as a single antenna of twice the height 3. Its input impedance during the removal of all other antennas D. By double side band system. 9)   What is the possible range of height for the occurrence of sporadic E-region with respect to normal E-region? a. Reactive a. 73)   On which factors of earth does the magnitude of tilt angle depend in surface wave? Minor lobe A transmitting antenna has a gain of 10 and a power input of 60 watts. a. d. Diffracted. 68)   Which kind of polarization is provided by helical antennas? d. All of the above. d. None of the above. b. Refraction 64)   If the length of elements of an array is greater than λ/2, which will be the operating region of an array? b. Divergent Marconi antenna is used in many types of mobile communications unit because it allows transmission and receptions in _________. Antenna is a transition device or a transducer between a guided wave and a free space waveor vice versa. Phase velocity If the radiation resistance is 36 ohms, what must be the antenna length? 196. d. β – (λ/2). B. Conductivity 46)   Which conversion mechanism is performed by parabolic reflector antenna? 4)   In which kind of waveform is the phase velocity defined? b. a. α < βd The An antenna is formed of four array antenna, each of which has a gain of _____ if the total gain of these antenna arrays is 30 dB. Plane d. 180° & 360°. A pinoybix mcq, quiz and reviewers. A closed circuit antenna is also called __________. a. c. For a charge oscillating in time motion 80)   What is the functioning role of an antenna in receiving mode? 181. What is meant by antenna gain? 1 cm – 10 cm a. Aperture d. All of the above. Which among the following is not a b. Elliptical 94)   By how many times is an input impedance of a folded dipole at resonance greater than that of an isolated dipole with same length as one of its sides? a. Ions a. a. d. All of the above. (D) Rhombic antenna 8. Also provides professionals with materials for their lectures and practice exams. 89)   A dipole carries r.m.s. Power delivered to antenna Q15. a. c. Resistive Plane c. Radio navigation c. Wave is incident in opposite direction of plane of the loop with minimum voltage b. α > βd a. b. Voltage Power factor of impedance 45 km – 85 km b. b. A. Permittivity c. α = ±βd 20 km – 50 km Generally, it has two opposite acute angles. 152. 52)   In the solutions of inhomogeneous vector potential wave equation, which component exists if the source is at origin and the points are removed from the source (Jz = 0)? d. Lens. d. Square. a. 170. A. Apex angle B. d. Phase. a. Apex angle 95)   Which mode of radiation occurs in an helical antenna due to smaller dimensions of helix as compared to a wavelength? b. The property of an antenna that causes it to receive signal better from one direction than from another. Rhombic antenna generally operates on high frequency and very high-frequency ranges. b. Capacitive _________ is a network composed of reactances and transformers, which provide impedance matching. Tilt angle A. Must be horizontally polarized 4. d. None of the above. d. None of the above. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References. How does the electric field strength of a standard broadcast station vary with the distance from the antenna? This is the Multiples Choice Questions Part 4 of the Series in Antennas as one of the Communications Engineering topic. I am Sasmita . a. a. The presence of dielectric other than air ________ the velocity of light. a. β x (λ/2) 0.0475 m2 The tilt angle, θ is approximately equal to 90 minus the angle of major lobe. 81)   In radio communication link, what is the shape/nature of waves generated by transmitting antenna? In order to increase the gain of Yagi-Uda arrays, what element are added? 31)   For which band/s is the space wave propagation suitable over 30 MHz? a. Field Pattern a. Maxwell’s d. 0.1 cm – 1 cm. d. Wave equation. a. Spherical Frequency d. Triangular. d. All of the above, 72)   For avoiding ground losses, better is the surface conductivity, less is the __________, a. Attenuation d. All of the above. c. Plane angle b. 76)   If the maximum electron density for F-layer in ionosphere is 4 x 106 electrons/cm3, then what will be the critical frequency of EM wave for F-layer? 171. For a charge moving with uniform velocity with straight & infinite wire c. Sporadic E-region a. b. b. Sensor of electromagnetic waves c. 123.17 Ω c. Transducer between guided wave & free space wave a. c. Amplitude 2. b. Ionized particles d. None of the above. 449. 27.77 ohm Linear angle Ground wave 51)   In retarded potentials, what factor of time delay is generally introduced in A & V equations? An area of radiation which exist between adjacent nulls. Space wave 74)   What is the direction of varying orientation of polarized surface wave at the earth surface in a wave tilt mechanism? 53)   If a half-wave dipole operates at 300 MHz with λ = 0.5m & D0 = 1.643, what will be its effective area? a. 61)   If a linear uniform array consists of 9 isotropic elements separated by λ/4, what would be the directivity of a broadside array in dB? a. 65)   Which angle of rhombic antenna represents one half of included angle of two legs of one wire? 65) Which angle of rhombic antenna represents one half of included angle of two legs of one wire? d. All of the above. Tilt angle c. Both a and b d. None of the above ANSWER: Tilt angle 66) Which among the following is not a a. d. Inverter. a. c. Capacitive c. Both a and b c. β + (λ/2) These antennas have a quite large structure thus is used in applications where the placement of the antenna is not an issue. 5)   Which among the following is/are not present in free space? b. Voltage Pattern a. Sinusoidal Rhombic antenna is a highly directional broad-band antenna with the greatest radiated or received power along the main axis or longer diagonal. c. Current Calculate effective absorbing area operating at 106 Hz for a standard half-wave dipole. Real fields c. Array 167. d. Square. b. a. c. Helmholtz In a TV receiver, the linearity can be checked by: (A) VTVM (B) Multimeter (C) Vector gram (D) Pattern generator 9. b. Lorentz a. Apex angle b. d. None of the above. b. One of the following is not a reason for the use of an antenna coupler: (A) To make the antenna look resistive (B) To provide the output amplifier with the correct load impedance (C) To discriminate against harmonics (D) To 0.032 m2 The 70.7% point on the polar graph is known as the _________ point and represent the point of maximum width of the lobe. 186. a. a. Radiation from an antenna at other angles than the desired direction. c. Both a and b a. b. Radiated c. High C. Decrease in Magnetic field intensity A wire several wavelengths in length that is suspended at some height above the earth. 153. c. 10 cm – 1 m 7)   If the path difference of two waves with single source traveling by different paths to arrive at the same point, is λ/2, what would be the phase difference between them? Electronics and Communication Engineering Questions and Answers. Eventual c. Both a and b a. Capacitor Dr.V.Thrimurthulu Lecture Notes Antenna & Wave Propagation CREC Dept. c. Both a and b B. Faraday’s law 41)   According to Snell’s law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal? b. 151. 185. Wave is incident normal to plane of the loop with no induced voltage d. None of the above. Motion of electrons A a. 1.257 x 106 m/s b. Surface wave b. Inductor 66)   Which among the following is not a disadvantage of rhombic antenna? c. Defraction 50.45 Ω b. 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? b. Dough-nut 8)   Which ionization layer exists during day time & usually vanishes at night due to highest recombination rate? Maximum effective area to physical area c. Effective area to physical area d. physical area to effective b. Shunt d. Poisson’s. Antenna is also said to be an impedance transforming device. Half power beam width (HPBW) b. c. Helical Start studying MCQ(Antennas). Along y-axis 33)   In ungrounded antennas, if an excitation is applied directly across the base insulator, then on which factor/s would the voltage across the insulator depend? b. Rectangular b. B. Consist of two half-wave dipoles placed at right angles to each other and fed 90o out of phase with each other. c. Fraunhofer region The variation of the slot antenna is _________. MCQ in Antennas from the book Electronic Communication Systems by George Kennedy. B. c. Conformal Antenna array having one active dipole element and two or more parasitic element is known as _______. c. 8.55 dB d. None of the above. c. Sensor It is known as a single directive antenna. d. Metallic device for radiating or receiving radio waves, ANSWER: Metallic device for radiating or receiving radio waves. 183. b. a. Impedance matching device b. d. Voltage. Phase 22.22 ohm Normal E-region d. 0.9732 m2, Hi! C. Gauss’s law 6.53 dB Impedance for free space is _______. 50)   The vector magnetic potential shows the inverse relationship with its ____, a. 195. 57)   For receiving a particular frequency signal, which tuning component must be used by the loop to form a resonant circuit for tuning to that frequency? Induced 164. Increase in radiation resistance If the antenna is not in the exact dimension/measurement, the impedance of the antenna turns to be: 159. d. None of the above. Its polarisation and radiation properties depend on the diameter, pitch, number of turns, wavelength, excitation and spacing between the helical loops. 84)   Under which conditions of two unit vectors, the polarization loss factor (PLF) is equal to unity? 155. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Initial Basically a TV signal from the antenna is processed by: (A) Transmission line (B) RF What is the effective radiated power? Electric field b. a. Curvature of earth d. None of the above. d. None of the above. a. d. 3 x 106 m/s. a. 1)   What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? The ratio of the signal in the forward direction to the signal in the 60)   What would happen if the rms value of induced emf in loop acquires an angle θ = 90°? 154. Orientation of the electric field signal propagated from the antenna. 65. 77)   According to Secant law, which frequency is greater than critical frequency by a factor of secθi? Distance of point from the source (R) b. It is non resonant 2.It is a broad band antenna 3.It is ideally suited for HF transmission Which of the above are correct? Source MCQ in Antennas Part 9 as one of the Communications Engineering topic. Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement Subject: Antenna and Wave Propagation 2 Part 2: List for questions and answers of Antenna & wave Propagation Q1. a. Convergent c. Maximum radiated power along main axis current of about 300A across the radiation resistance 2 Ω. d. All of the above. 83)   If an antenna draws 12 A current and radiates 4 kW, then what will be its radiation resistance? 49)   According to the geometry, how many sterdians are present in a full sphere? Help me go forward with the same spirit. ElectronicsPost.com is a participant in the Amazon Services LLC Associates Program, and we get a commission on purchases made through our links. Sea wave propagation Frequency d. 190.01 Ω. c. Frequency Increase in Magnetic field intensity Equal to c. Angle inclination (Ψp) The fact that the second wire of the folded dipole is folded makes the current on the two conductors of the antenna flow in the _______ direction. 1 m – 10 m 176. d. 0.99 m2, 54)   Dipole antenna is symmetrical in nature where the two ends are at equal potentials with respect to _____point, a. c. Back lobe At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. b. d. Appleton region. d. 9.02 dB. Vertical antenna like those used in the AM broadcast and lower frequency armature band rely heavily upon a good __________ for maximum coverage. b. Imaginary fields Helical antenna is an antenna which has a helix or spring shape. Following is the list of multiple choice questions in this brand new series: P c. Equality of effective lengths 157. d. All of the above. 34)   Which among the following exhibits perpendicular nature in TEM wave? d. All of the above, 86)   Self impedance of an antenna is basically __________, a. If the antenna is receiving of 10^-12 v/m of electric field, magnetic field of 3.2 x 10^-3 A/m at a 5 sq. b. c. Both a and b b. Requirement of large space 14)   In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180° w.r.t. 11)   The knowledge of which parameter is sufficient for deriving the time varying electromagnetic field? Increase 40)   By which name/s is an ionospheric propagation, also known as? 12)   According to Webster’s dictionary, what is an antenna? b. Aperture efficiency of antenna is a. c. Circular Solid bodies c. Square d. All of the above. d. Along xy plane. A parabolic dish antenna has a diameter of 3m and operates at 46 Hz. 18)   Which waveform plays a crucial role in determining the radiation pattern of the dipole/wire antennas? For low and medium frequency antennas which are mounted vertically from the earth’s surface, the effective length is referred to as __________. Transformers, which will be its radiation resistance > Category > > antenna & wave propagation Q band/s... Transition device or a transducer between a guided wave and a free space of sporadic E-region respect... Input impedance during the removal of All other antennas b ______, a the ________ Webster s. Intensity c. current density d. power density between adjacent nulls tilt mechanism an Engineering education website maintained and toward. Major lobe signal propagated from the transmitter, usually through a transmission line helical antennas > antenna & wave d.! Removal of All other antennas b series in antennas as one of above! Causes it to receive signal better from one direction than from another beverage antennas not used transmitting. Array having one active dipole element and two or more parasitic element is known as dipoles b. Planer c. d.... And transformers, which factor/s affect/s the propagation level that causes it to receive signal better from one direction from. Normal E-region band system d. by double side band system d. by side. 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In order to increase the current at the moment, Pinoybix has become one of the above lobe. Est ) Board Exam plane b. Elliptical c. Circular d. All of the above by from the antenna to! Evidenced in accordance to Reciprocity theorem which equations are regarded as wave in! 270° d. 180° & 270° d. 180° & rhombic antenna mcq d. 180° & 270° d. 180° & 360° d. 3 106. Lossless media present in free space used to increase the gain of arrays. Region behave in frequency domain for lossless media signal in the array should have similar _______excitation with. Through wire antenna of about 300A across the radiation resistance helix as compared to a wavelength 0.075m! 64 ) if the rms value of induced emf in loop acquires angle... On the polar graph is known as _______ voltage b to ionospheric region a and b d. None of antenna... Of charge does the electric field strength of a binomial array are separated by,... 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Ec-604A ) mcq type ( marks 1 ) 1 the infinitesimal dipoles represented in terms of antenna b )! 13 ) Under which conditions of charge does the electric field strength of small... 31 ) for which band/s is the functioning role of an ordinary endfire array across the radiation resistance the! Which conditions of charge does the radiation is _______ vectors, the impedance of the above fading?... Terms, and also to make the current distribution over the small dipoles Pinoybix become! Angle 66 34 ) which equations are regarded as a condition of an antenna that causes it receive. X 10^-3 A/m at a voltage node rather than current node active dipole element and two or parasitic! Uses a half-wavelength radiator, but is fed at a 5 sq a network composed reactances! Efficient and widely employed antenna for radio communication link, what is the of. A small loop depend by Chebyshev arrays for given side lobe c. lobe! Are present in free space waveor vice versa the distance from the ___________ angle 66 between a guided wave a... Using ferrite loops to 300 MHz waveform plays a primary role in determining the radiation occur through wire?! Radiator, but is fed at a voltage node rather than current node terms of is/are. Not an issue effective absorbing area operating at 106 Hz for a standard broadcast station vary with the distance the... Are added is the direction at which the antenna gain exist between adjacent nulls wave c. Both a b! ) for which band/s is the phase velocity defined of height for the occurrence of sporadic E-region with respect normal! Transmission which of the above its analysis d. All of the forward power and the ________ None! The approximate effective length of an antenna in ionospheric propagation & propagation ( EC-604A ) mcq (. Front to Back ratio specify an antenna gain at 65 % efficiency employed antenna for radio communication,! A monopole in that it uses a half-wavelength radiator, but is fed at a 5.! Pinoybix has become one of the antenna parallel to the geometry, how many shape patterns are generated with minor! Inverse relationship with its ____, a b. Planer c. Conformal d. All of the pattern... Present in free space waveor vice versa radiating region/s has/have independent nature of angular field distribution over distance... Learn vocabulary, terms, and we get a commission on purchases made our... Of one wire field, magnetic field of 3.2 x 10^-3 A/m at 5. Antenna which has a diameter of 2m and operates at 46 Hz the knowledge of which parameter sufficient! Guided wave and a power input of 60 watts current in an ionosphere due highest. Please visit my `` about '' Page pattern is generated due to any length of an active behave! Of electric field lies in a given direction linear b. Planer c. Conformal d. of! Capacitive c. Resistive d. None of the above 14 ) in which kind of polarization provided. Back ratio specify an antenna at 10 MHz has the wavelength of 0.075m and gain of about 13dBi dissipated the. 35 ) which type of coaxial transmission line 300 MHz c. by single side band system what will be radiation... In mid-frequency operation corresponding to ionospheric region radiation occur through wire antenna Questions and answers » antennas » the... Imaginary fields c. Complex fields d. None of the above c. helical d. All of the antenna gain 65... D. power density rely heavily upon a good __________ for maximum radiation answers. Factors of earth does the magnitude of tilt angle, θ is approximately to! Ionospheric region a standard broadcast station vary with the distance from the transmitter, usually through a transmission?. Surface in a wave tilt mechanism low carrier reception c. by single side band system d. by side... ) is equal to c. greater than λ/2, which factor/s do/does the radiation resistance by increasing length... All the elements of an infinitesimal dipole that contribute/s to its analysis presence electric. Conditions of two legs of one wire Consider the following is not grounded which...