The type of atmospheric layers which will best return signals to earth are: consists of magnetised particles around the earth, is formed from layers of ionised gases around the earth, is a spherical belt of solar radiation around the earth. The radio signal spreads out from the transmitter along the surface of the Earth. 31) For which band/s is the space wave propagation suitable over 30 MHz? Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Ground Wave Propagation; 1) Which layer has the atmospheric conditions exactly opposite to that of standard atmosphere? Indicate which one of the following terms applies to troposcatter propagation . I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. If you are looking for a reviewer in Communications Engineering this will definitely help. Subject: Antenna and Wave Propagation 3. The probable cause of this is: Skip distance is a term associated with signals through the ionosphere. The medium which reflects high frequency radio waves back to the earth's surface is called the: The highest frequency that will be reflected back to the earth at any given time is known as the: All communications frequencies throughout the spectrum are affected in varying degrees by the: The polarisation of an electromagnetic wave is defined by the direction of: That portion of HF radiation which is directly affected by the surface of the earth is called: Radio wave energy on frequencies below 4 MHz during daylight hours is almost completely absorbed by this ionospheric layer: Because of high absorption levels at frequencies below 4 MHz during daylight hours, only high angle signals are normally reflected back by this layer: Scattered patches of high ionisation developed seasonally at the height of one of the layers is called: For long distance propagation, the radiation angle of energy from the antenna should be: more than 30 degrees but less than forty-five, more than 45 degrees but less than ninety. 3. MCQ in Wave Propagation ; MCQ in Radiation Patterns ; MCQ in Wavelength Calculations ; MCQ in Radiation Resistance ; MCQ in Diversity Systems ; Start Practice Exam Test Questions Part 1 of the Series. b. fading . the Doppler effect would cause HF waves to be shifted into the VHF and UHF bands. Towards b. Also provides professionals with materials for their lectures and practice exams. As electromagnetic waves travel in free space, only one of the following can happen to them: 13. ELECTRONICS IMPORTANT MCQ PDF Antenna Amp Wave Propagation 3. Mcqs in Wave propagation A 'skip zone' is: the distance between the antenna and where the refracted wave first returns to earth the distance between the far end of the ground wave and where the refracted wave first returns to earth 32) If the tower antenna is not grounded, which method of excitation is/are applicable for it? Answer. 2) Which among the following is an application of high frequency? A. The test carries questions on Uniform plane waves, Ground wave propagation, Ionospheric propagation, Introduction of antenna, Antenna parameters, Radiation integrals, Dipoles, Loop antenna, Antenna … Three recognised layers of the ionosphere that affect radio propagation are: Propagation on 80 metres during the summer daylight hours is limited to relatively short distances because of. a) Linear. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Fun Facts. 8) 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? Q1. Ground Wave propagation is a method of radio wave propagation that uses the area between the surface of the earth and the ionosphere for transmission. The wave when propagates through the Earth’s atmosphere is known as ground wave. This is the Multiple Choice Questions in Chapter 8: Radiation and Propagation of Waves from the book Electronic Communication Systems by George Kennedy. upto 2 MHz only. 36236362 Mcq Antenna Antenna Radio Polarization Waves. Harikesh Yadav June 1, 2017 ECE MCQ PDF, General. Part 4: List for questions and answers of Antenna & wave Propagation . View Answer: Answer: Option B. Frequencies in the UHF range normally propagate by means of. Electromagnetic waves are refracted when they, a. pass into a medium of different dielectric constant, b. are polarized at right angles to the direction of propagation, c. encounter a perfectly conducting plane, d. pass through a small slot in a conducting plane, a. is caused by reflections from the ground, c. will occur when the waves pass through a large slot, d. may occur around the edge of a sharp obstacle, 16. The skip distance of radio signals is determined by the: power fed to the final amplifier of the transmitter, only the angle of radiation from the antenna, both the height of the ionosphere and the angle of radiation from the antenna.