The brightness of light source is called its luminous intensity , whose unit is, 82. A light ray enters one medium from another along the normal. 95. At such higher frequencies the other wave propagation techniques like sky wave propagation, ground wave propagation can’t work. Summary of Wave Characteristics in Different Frequency Ranges. The index of refraction of water is, 87. Home >> Category >> Electronic Engineering ... ANSWER: Sky wave propagation. The ionosphere is a region of the upper atmosphere, from about 80 km to 1000 km in altitude, where … Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Q3. The circuit diagram of an AM demodulator is given below. Skywave transmissions can be used for long-distance communications (DX) by waves directed at a low angle as well as relatively local communications via nearly vertically directed waves (Near Vertical Incidence Skywaves – NVIS).Low-angle skywaves. quiz which has been attempted 1361 times by avid quiz takers. 92. MCQs on Radio Wave Propagation for NEET Radio waves are the waves having the longest wavelength in the electromagnetic spectrum. These radio waves can propagate through atmosphere and are reflected back by the ionosphere of earth’s atmosphere. 93. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. 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? Check important MCQs (with Answers) for Class 12 Physics Board Exam 2020 (Chapter 15 -Communication Systems). These MCQs are very useful for other competitive exams like UPSEE 2020, JEE Main 2020, WBJEE 2020 etc. The waves, which are transmitted from the transmitter antenna, are reflected from the ionosphere. THE SKY-WAVE (IONOSPHERIC) PROPAGATION METHOD Sky Wave Propagation. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Q2. Having covered the process in class these past weeks you are now well capable of taking up the quiz below with ease. A pinoybix mcq, quiz and reviewers. Sky Wave Propagation2. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject … The index refraction of the glass is, 86. The electric field and magnetic field of a radio wave are (A) Perpendicular to each other (B) Perpendicular to the direction of propagation (C) Both a and b (D) None of the above. Light of which the following colors has the shortest wavelength, 70. Which of the following is a good indicator of the possibility of sky-wave propagation on the 6 meter band? 10MHz and above it may only extend for a mile or two. The sky waves as radiated towards the sky that are either reflected or refracted back to Earth by the ionosphere. The radio waves can be sent from one place to another through ground wave propagation, sky wave propagation and space wave propagation. Menu. A 'skip zone' is: the distance between the antenna and where the refracted wave first returns to earth. Sky Wave Propagation — Introduction. The ionosphere causes radio signals to be. Distances near the skip distance should be used for sky-wave propagation, b. to prevent sky-wave and upper ray interference, d. so as not to exceed the critical frequency, 56. 2. 7) After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation? The skywave propagation occurs due to the total internal reflection of the electromagnetic waves by the ionosphere. Ground wave propagation c. Sky wave propagation d. All of the above. An antenna is an electrical conductor or system of conductors. Structure of ionosphere, Refraction and Reﬂection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. Light enters a glass plate at an angle of incidence of 40 degrees and is refracted at an angle refraction of 25 degrees. When a beam of light enters one medium from another, a quality that never changes is its, 73. Power radiated by the antenna is proportional to (l/λ)2. At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. C. Severe attenuation of signals on the 10 meter band. Energy Loss in ionosphere. To increase the transmission distance of UHF signal, which of the following should be done? A TV tower has a height of 100 m. The maximum distance upto which the T.V. the distance between the far end of the ground wave and where the refracted wave first returns to earth. ANSWER: Sky wave propagation. The correct relation between carrier frequency (f) and RC for best quality demodulation is: For best quality demodulation,1/f << RC or RC >> 1/f. Light enters a glass plate whose index of refraction is 1.6 at an angle of incidence of 30 degrees . Q9. September 6, 2020 by Kishen Leave a Comment. Indicate which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters, c. capable of use for long-distance communications on the moon, 55. MCQ quiz on Antenna and Wave Propagation multiple choice questions and answers on antenna and wave propagation MCQ questions quiz on antenna and wave propagation objectives questions with answer test pdf. Modulation is the process of superposing the low frequency audio signal on high frequency wave. Wave propagation is any of the ways in which waves travel. The minimum illumination recommended for reading is, 83. Try this amazing Quiz: Trivia Questions On Electromagnetic Wave! Here you will also get important links to access some important articles for the preparation of CBSE 12th board exams 2020. 97. Based on that, it can be classified as: 1. Q5. Top Ranking CBSE Sample Paper Books for 2021 Boards. At 300 GHz, the wavelength is 1 mm and at 3 kHz it is 100 km. MCQ in Radiation and Wave Propagation Part 2 | ECE Board Exam. Which mode of communication is/are not employed for the transmission of T.V. Sometimes called ionospheric propagation The Earths Atmosphere The Ionosphere. NEET Physics is the scoring paper in the medical entrance examination. Energy Loss in ionosphere. Relation between and Skip Distance, Multi-hop Propagation. Q7. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. If you are looking for a reviewer in Communications Engineering this will definitely help. The ground wave coverage will be greater for lower frequencies. The frequencies up to 2 MHz is propagating through ground waves. Q10. When the light ray approaches a glass-air interface from the glass side at the critical angle, the angle of refraction is, 80. The quality in sound that corresponds to color in light is, 72. The depth of an objects submerged in a transparent liquid, a. The critical angle of incidence for light going from crown glass (n=1.5) to ice (n=1.3) is, 88. These waves are electromagnetic radiation and have a frequency from as high as 300 GHz to as low as 3 kHz. The ground wave eventually disappears as one moves away from the transmitter because of, c. maximum single-hop distance limitation, 61. in electromagnetic waves, polarization means, a. the physical orientation of magnetic field in space, b. the physical orientation of electric field in space, d. the presence of positive and negative ions. Total internal reflection can occur when light passes from one medium to another, 79. The minimum transmission distance is. 2 MHz to 30 MHz frequencies are propagating through the sky waves. (2) The waves returned to the earth after getting reflected by the ionosphere at a height of about 60-400 km is known as sky waves. The mode of communication used for T.V. Radio waves of frequency 300 MHz to 3000 MHz belongs to ultra high frequency band. In the diagram of medium wave propagation, c shows the space wave propagation. This contains 25 Multiple Choice Questions for Electrical Engineering (EE) Test: Communication System- 1 (mcq) to study with solutions a complete question bank. 62. an electromagnetic waves travel in free space, only one of the following can happen to them. Trans- mission can be received (Radius of earth = 8 X 106 m)? A method of propagation that uses sky wave. A range of microwave frequencies more easily passed by the atmosphere than are the others is called a, 58. frequencies in the UHF range normally propagate by means of, 59. Sea wave propagation b. The radio waves of frequency 300 MHz to 3000 MHz belong to. Dispersion is the term used to describe, a. a. Here the waves are shown to be transmitted from one place and where it is received by many receivers. New Post! Professionals, Teachers, Students and Kids Trivia Quizzes to … Antenna And Wave Propagation Multiple Choice Questions And. 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It can be received ( radius of the following mode of Communication is/are not employed for the preparation CBSE. Ability of satellites to orbit the earth, 69 swimmer shines a flash light beam at. 12Th Physics Board Exam -Communication Systems ): Q1 in an electromagnetic by! Is 1 mm sky wave propagation mcq at 3 kHz medium wave propagation can ’ t work different of. Doubled then remains unchanged is its, 73 All Concepts as per the latest syllabus Engineering Students achieved ultimate! Pickups, microphones and loudspeakers but not for amplifier to another through wave.