180. Low c. Fraunhofer region 63) What kind of beamwidth is/are produced by Chebyshev arrays for given side lobe level (SLL)? 45 km – 85 km a. Depression layer c. Capacitive 36) If the magnetic field component of a plane wave in a lossless dielectric is H = 50 sin (2π x 106 t – 6x) azmA/m , what will be the wave velocity? Electric field intensity 40) By which name/s is an ionospheric propagation, also known as? c. Sky wave propagation c. For a charge oscillating in time motion d. 180° & 360°. 53) If a half-wave dipole operates at 300 MHz with λ = 0.5m & D0 = 1.643, what will be its effective area? (D) Rhombic antenna 8. d. Diffracted. Shape a. Ions c. 10 cm – 1 m 193. d. None of the above, 20) In flared transmission line, the radiation phenomenon increases due to ________ in flaring, a. b. 83) If an antenna draws 12 A current and radiates 4 kW, then what will be its radiation resistance? d. Wave equation. a. b. Elliptical a. Widest b. Area c. Both a and b d. 140 km – 200 km, 10) F2 layer of appleton region acts as a significant reflecting medium for _____ frequency radio waves, a. a. Reduced transmission efficiency Magnetic field intensity b. The 70.7% point on the polar graph is known as the _________ point and represent the point of maximum width of the lobe. Its polarisation and radiation properties depend on the diameter, pitch, number of turns, wavelength, excitation and spacing between the helical loops. 93) How do the elements of an active region behave? Rhombic antenna generally operates on high frequency and very high-frequency ranges. a. Aperture a. Power factor of impedance 172. 91) What is /are the advantages of using ferrite loops? 171. The design ratio of the log-periodic antenna must be _____. a. Inward c. 90 km – 130 km d. None of the above, 24) From the radiation point of view, small loops are _________radiators. d. All of the above. d. All of the above, 48) Sterdian is a measurement unit of __________, a. The ratio of the signal in the forward direction to the signal in the b. Reflected 174. d. None of the above. d. 3 x 106 m/s. A. Which among the following is not a 22.22 ohm a. 67) Why are beverage antennas not used as transmitting antenna? Half power beam width (HPBW) C. Decrease in Magnetic field intensity a. D-region c. Conformal b. Radiation from an antenna at other angles than the desired direction. 2) Which among the following is an application of high frequency? 181. b. Rectangular a. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Linear Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation Q. 45) Which antennas are renowned as patch antennas especially adopted for space craft applications? 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. Eventual d. α ≠ ±βd. d. Invasion layer. 71) When an electromagnetic wave travels from transmitter to receiver, which factor/s affect/s the propagation level? Real fields a. d. Metallic device for radiating or receiving radio waves, ANSWER: Metallic device for radiating or receiving radio waves. 7.99 dB b. Voltage Pattern b. Outward d. All of the above. Antenna Theory - Antenna Arrays - An antenna, when individually can radiate an amount of energy, in a particular direction, resulting in better transmission, how it would be if few more elements a. Impedance matching device 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 d. None of the above, ANSWER: Distance of point from the source (R). d. None of the above. d. 9.02 dB. Is one supplied power from the transmitter, usually through a transmission line. These antennas have a quite large structure thus is used in applications where the placement of the antenna is not an issue. 187. Q15. 155. b. Phase 34) Which among the following exhibits perpendicular nature in TEM wave? 50.45 Ω A [v]) 1, 2, 3 B [ ]) 1, 3 only C [ ]) 2, 3 only 29) Which among the following is regarded as a condition of an ordinary endfire array? b. b. Mor-gain_antenna_broch_1977.pdf Mor-gain_antenna_broch_1978.pdf Mosley_Antenna_maintenance_2011.pdf Mosley_Checking_traps_2011.pdf Mosley_Devant_special_user.pdf Mosley_El_Toro_review_1965.pdf Mosley_MCQ 161. Tilt angle Point angle 25) According to the directivity of a small loop, which value of ‘θ’ contributes to achieve the maximum value of radiation intensity (Umax)? a. Spherical d. All of the above, 72) For avoiding ground losses, better is the surface conductivity, less is the __________, a. Attenuation 4) In which kind of waveform is the phase velocity defined? b. Fresnel region I am Sasmita . d. All of the above, ANSWER: For a charge oscillating in time motion. Tilt angle c. Both a and b d. None of the above ANSWER: Tilt angle 66) Which among the following is not a a. Pinoybix.org is an engineering education website maintained and designed toward helping engineering students achieved their ultimate goal to become a full-pledged engineers very soon. A dish antenna has a diameter of 2m and operates at 46 Hz, find the antenna gain at 65% efficiency. b. Converter D. Kirchoff’s law. It is a very efficient and widely employed antenna for radio communication where enough space necessary for its … A discone antenna is a radiator whose impedance can be directly matched to what type of coaxial transmission line? Low radiation resistance D. Decrease in radiation resistance, 92) In an electrically large loop, an overall length of the loop is equal to ______. b. Ionized particles d. 0.1 cm – 1 cm. 178. 65) Which angle of rhombic antenna represents one half of included angle of two legs of one wire? Only Refraction Following is the list of multiple choice questions in this brand new series: P Calculate the aperture. c. Amplitude Its input impedance during the removal of all other antennas 96) A rectangular horn antenna operating at 4GHz has the wavelength of 0.075m and gain of about 13dBi. c. Reflective region c. Stability a. 191. b. 0° & 180° b. Sensor of electromagnetic waves Ratio of g p and g d b. c. Both a and b 160. c. Defraction b. Vertical b. Planer d. Along xy plane. Sea wave propagation b. Along y-axis 79) In lens antenna, what kind of wave energy is transformed into plane waves? 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. a. Inductive 47) Which antenna radiating region/s has/have independent nature of angular field distribution over the distance from the antenna? Series a. Ionospheric c. Both a and b c. 0.65 m2 Its impedance by taking into consideration the consequences of other antennas b. The major lobes of the directive pattern are those in which the radiation is _______. d. 190.01 Ω. 23) On which factor/s do/does the radiation field of a small loop depend? a. MCQ in Antennas Part 1 as part of the Communications Engineering (EST) Board Exam. a. Apex angle b. 88) The concept of magnetic vector potential finds its major application in deriving expression of magnetic field intensity especially for ______, a. Reflection or Scattering 90) What is/are the major applications of an infinitesimal dipole that contribute/s to its analysis? c. Reflected d. Inductive. d. Phase. c. Equality of effective lengths a. Reactive c. Both a and b a. l ≤ (λ /50) b. Dough-nut b. Rectangular 169. 16) Which among the following defines the angular distance between two points on each side of major lobe especially when the radiation drops to zero? a. d. Square. d. None of the above. a. Perpendicular a. 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? 200. Improvement in radiation resistance by increasing dipole length Phase c. Both a and b a. c. Partial reflection & refraction Normal E-region 173. b. Refracted a. Spherical a. Along x-axis Calculate effective absorbing area operating at 106 Hz for a standard half-wave dipole. Increase in Magnetic field intensity Impedance for free space is _______. b. Resistive I am an M.Tech in Electronics & Telecommunication Engineering. 39) After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation? B. 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That of standard atmosphere dipole/wire antennas in lens antenna, which radiating axis!
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