Parabolic Reflector Antenna Question & Answers September 27, 2022 By WatElectronics This article lists 50 Parabolic Reflector Antenna MCQs for engineering students. All the Parabolic Reflector Antenna Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of a Parabolic Reflector Antenna. German Physicist named Heinrich Hertz discovered Parabolic reflectors during the invention of Radio waves. Typical Parabolic reflector antennas contain metal-made parabolic reflectors along with small feeding antenna and reflectors facing each other. Most common parabolic reflectors are in the shape of a dish popularly referred to as a parabolic Dish or Dish Antenna. Directivity is high and is considered to be the major advantage of this type of antenna. Functionality resembles a Flashlight Reflector. Parabolic reflectors used must be larger compared to the wavelengths of Radio waves used. The radio spectrum's higher frequencies section makes use of these antennas. In Point-to-point communication, these antennas are utilized as High-gain antennas. Microwave Relay links to carry television and telephone signals among near cities, WAN/LAN For data communication links, Spacecraft and Satellite communication antennas, and Radio telescopes use these Parabolic Reflectors. 1). What are the various Reflector antennas? Plane Reflector Corner Reflector Parabolic Reflector All Mentioned Above None Hint 2). What type of antenna is a Parabolic Reflector? Microwave Antennas Aperture Antennas Wire Antennas Array Antennas None Hint 3). What is the range of frequency of Parabolic Reflector Antennas? Above 1 Hz Above 1 MHz Above 1 GHz Above 1 THz None Hint 4). Line joining vertex and the focus in a Parabolic Reflector is referred to as _____________? Axis of Reflection Axis of Symmetry Directrix Axis of Refraction None Hint 5). Focal Length to the size of aperture ratio in a Parabolic Reflector is referred to as __________? F over D Ratio F Ratio D Ratio D over F Ratio None Hint 6). What are the major parts of a Parabolic Reflector Antenna? Reflector Feed Mechanism a & b None None Hint 7). What can be the actual section of radiating in the Parabolic Reflector Antenna? Reflector Feed Mechanism a & b Transmitter None Hint 8). Reflecting surface of a Parabola in a Parabolic Reflector Antenna is ___________? Active Passive a & b None None Hint 9). Incoming signals concentrated at a point in a Parabolic Reflector Antenna is ___________? Focus Vertex Directrix Focal Length None Hint 10). What is the point present at the center of a Parabolic Reflector Antenna? Focus Vertex Directrix Focal Length None Hint 11). Distance from the focus to the vertex of a Parabolic Reflector Antenna is ___________? Focus Vertex Directrix Focal Length None Hint 12). What is the formula to calculate the Focal Length? D^2 /16 c D/16c D^2 /16 D/16 None Hint 13). What makes wave-fronts in phase in a Parabolic Reflector Antenna? Reflector Shape Feed Mechanism Focal Length Directrix None Hint 14). What is the opening of a Parabolic Reflector Antenna? Focus Vertex Aperture Focal Length None Hint 15). What are the various factors affecting Parabolic Reflector Antennas Gain? Reflecting Surface Diameter Operational Wavelength Efficiency of Antenna All Mentioned Above None Hint 16). What happens to gain if the reflecting surface diameter of a Parabolic Reflector Antenna is large? Gain is High Gain is Low Gain is Decreasing Gain is Reduced None Hint 17). Gain of a Parabolic Reflector Antenna depends upon _________ when wavelengths are considered? Reflector Size Feed Mechanism Focal Length Directrix None Hint 18). If the Reflector is utilized on the two distinct frequencies gain obtained is __________? Same Different Similar Constant None Hint 19). How the gain of a Parabolic Reflector Antenna is calculated? On knowing Reflector Surface Diameter Signals Wavelength Knowing Efficiency of Antenna All Mentioned Above None Hint 20). What is the formula to calculate Parabolic Reflector Antenna Gain? 10\log_{10}{k}{(\pi D/\lambda)}^2 10\log_{10}{k}(\pi D/\lambda) \pi D/\lambda \pi D None Hint 21). What happens to beam width if the Parabolic Reflector Antenna Gain increases? Rises Falls Increases Constant None Hint 22). How to calculate the beamwidth of a Parabolic Reflector Antenna? \pi D/\lambda \pi D 70\lambda/D D/16 None Hint 23). Narrow beamwidths compared to various antenna types are provided by ____________? Panel Antennas Patch Antennas Parabolic Reflector Antennas Yagi Antennas None Hint 24). Narrow beamwidth in a Parabolic Reflector Antenna must have a large _________ of used Radio waves? Frequency Wavelength Diameter Efficiency None Hint 25). Radiating element in a Parabolic Reflector Antenna at focus is __________? Dipole Horn Antenna a or b Reflector None Hint Parabolic Reflector Antenna MCQs for Exams 26). What are the various feeding systems of a Parabolic Reflector Antenna? Offset Feed Cassegrain Feed Gregorian Feed All Mentioned Above None Hint 27). Radiating element placed at a Focal point in a Parabolic Reflector Antenna of _________? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 28). Feed and the support used to block some part of the beam in ____________ of a Parabolic Reflector antenna? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 29). Which of the feed doesn’t require secondary surfaces of reflection in a Parabolic Reflector antenna? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 30). What is the efficiency of using a Cassegrain feeding in a Parabolic Reflector antenna? 50-55 55-60 60-65 65-70 None Hint 31). Overall length of Dish antenna among two Reflectors is ________ than length amid Parabolic reflector and radiating element? Larger Shorter Greater Can’t Say None Hint 32). Secondary reflector used is Concave in shape in ____________ feed of a Parabolic Reflector antenna? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 33). Better illumination and efficiency up to 70 % is provided in __________? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 34). Parabola of asymmetrical shape segment type reflector is utilized in __________? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 35). What type of feeding mechanism is utilized in Home Satellite antennas of Television? Offset Feed Cassegrain Feed Gregorian Feed Focal Feed None Hint 36). What is used in a Parabolic Reflector Antenna that improves performance? Focal Feed Cassegrain Feed Gregorian Feed b & c None Hint 37). What affects the efficiency of aperture in Parabolic antennas? Feed Spill over Feed Illumination Taper Aperture Blockage All Mentioned Above None Hint 38). Aperture of reflector is large than wavelengths in _________? Parabolic Reflector Antennas Aperture Antennas Wire Antennas Array Antennas None Hint 39). What type of antennas are mostly preferred in TV Dishes? Lens Parabolic Reflector Loop Helix None Hint 40). Size of a Parabolic Reflector Antenna is quite _______? Large Small Compact Medium None Hint Parabolic Reflector Antenna MCQs for Students 41). Beam adjustments are easier by using __________? Parabolic Reflector Antennas Aperture Antennas Wire Antennas Array Antennas None Hint 42). What are the advantages of a Parabolic Reflector Antenna? High Gain High Directivity Less Power Wastage All Mentioned Above None Hint 43). Parabolic Reflector used in an antenna reduces ___________? Major Lobes Minor Lobes Shape Size None Hint 44). What are the various applications of a Parabolic Reflector Antenna? Microwave Relay Links Wireless LAN/WAN Links Spacecraft & Satellite Communications All Mentioned Above None Hint 45). To locate the guided missile, airplane and ships ____________ are used? Parabolic Reflector Antennas Aperture Antennas Wire Antennas Array Antennas None Hint 46). What directs the Radio waves to the receivers' point of focus in it? Panel Antennas Patch Antennas Parabolic Reflector Antennas Yagi Antennas None Hint 47). Gain in a Parabolic Reflector Antenna is ______________? High Moderate Low Infinite None Hint 48). Which of these antennas is highly efficient directional antenna? Panel Antennas Patch Antennas Parabolic Reflector Antennas Yagi Antennas None Hint 49). Which antenna can collimate radiations of an Isotropic source confined into a Parallel beam? Parabolic Reflector Antennas Aperture Antennas Wire Antennas Array Antennas None Hint 50). Which antenna is used in collecting energies from distant sources? Parabolic Reflector Antennas Aperture Antennas Wire Antennas Array Antennas None Hint For More MCQs Antennas Question & Answers. Loop Antenna Question & Answers. Yagi Uda Antenna Question & Answers. Horn Antenna Question & Answers. Please fill in the comment box below. Time's up
