A. a. Ions 198. Which among the following is not a disadvantage of rhombic antenna? 82) Which among the following elucidate the generation of electromagnetic waves? 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? Requirement of large space a. Apex angle b. b. Rectangular b. 6.53 dB 173. c. 0.5521 m2 a. Maxwell’s b. Lorentz c. Helmholtz d. Poisson’s ANSWER: Helmholtz 3) If the magnetic field component of a plane … a. Spherical 27) What is the nature of radiation pattern of an isotropic antenna? Ratio of g p and g d b. a. c. Conformal 60) What would happen if the rms value of induced emf in loop acquires an angle θ = 90°? The case where the electric field lies in a plane parallel to the earth surface. d. Wave equation. b. Regression layer 176. d. Appleton region. Reflection or Scattering d. Front to back ratio (FBR), 17) If an observation point is closely located to the source, then the field is termed as ________, a. 78) How is the effect of selective fading reduced? The variation of the slot antenna is _________. b. c. Magnetic field of earth Shape Radiation from an antenna at other angles than the desired direction. 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. 5) o parabolic reflectors, corner reflectors o These are high gain antennas usually used in radio 193. D. Reflectivity. a. c. 2.50 x 106 m/s c. Current density a. Reactive d. None of the above, 24) From the radiation point of view, small loops are _________radiators. Phase 69) According to depth of penetration, what is the percentage proportion of attenuated wave w.r.t its original value? d. None of the above. 14) In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180° w.r.t. Help me go forward with the same spirit. b. 38) Which type of ground wave travels over the earth surface by acquiring direct path through air from transmitting to receiving antennas? d. Congruent. c. 180° & 270° 183. d. Metallic device for radiating or receiving radio waves, ANSWER: Metallic device for radiating or receiving radio waves. 49) According to the geometry, how many sterdians are present in a full sphere? 79) In lens antenna, what kind of wave energy is transformed into plane waves? c. Both a and b d. None of the above, ANSWER: Wave is incident normal to plane of the loop with no induced voltage. d. None of the above. 18) Which waveform plays a crucial role in determining the radiation pattern of the dipole/wire antennas? 28) In broadside array, all the elements in the array should have similar _______excitation along with similar amplitude excitation for maximum radiation. b. 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? d. All of the above. d. All of the above, ANSWER: For a charge oscillating in time motion. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation Q. a. 84) Under which conditions of two unit vectors, the polarization loss factor (PLF) is equal to unity? 7.99 dB 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. Both a and b a. 1.257 x 106 m/s Source Eventual b. Fresnel region Must be horizontally polarized 4. Less than Also provides professionals with materials for their lectures and practice exams. c. Both a and b Magnetic field intensity c. Radio navigation 160. d. Diffracted. Following is the list of multiple choice questions in this brand new series: P current of about 300A across the radiation resistance 2 Ω. d. 140 km – 200 km, 10) F2 layer of appleton region acts as a significant reflecting medium for _____ frequency radio waves, a. b. d. Invasion layer. Along x-axis a. A. Permittivity The d. None of the above, ANSWER: Its input impedance during the removal of all other antennas. 68) Which kind of polarization is provided by helical antennas? Vertical antenna like those used in the AM broadcast and lower frequency armature band rely heavily upon a good __________ for maximum coverage. b. 1 m – 10 m 153. b. Converter c. Sky wave propagation c. 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