Antennas and wave propagation MCQs January 8, 2026November 20, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. What is the primary function of an antenna? (A) To amplify signals (B) To filter noise from a signal (C) To convert electrical signals into electromagnetic waves and vice versa (D) To provide impedance matching 2. Which of the following is NOT a type of antenna? (A) Dipole antenna (B) Parabolic antenna (C) Loop antenna (D) Quartz antenna 3. The radiation pattern of an antenna is a graphical representation of: (A) Power distribution as a function of distance (B) Power distribution as a function of direction (C) The impedance of the antenna (D) Frequency variation over time 4. The gain of an antenna is a measure of: (A) Efficiency of signal modulation (B) Ability to radiate energy in a specific direction (C) Total power output of the antenna (D) Frequency response 5. What does VSWR (Voltage Standing Wave Ratio) indicate in an antenna system? (A) Power gain of the antenna (B) Impedance matching quality (C) Radiation efficiency (D) Frequency range 6. The directivity of an antenna refers to: (A) The maximum gain of the antenna (B) The bandwidth of the antenna (C) The radiation resistance of the antenna (D) The ability to focus energy in a specific direction 7. Which type of antenna is commonly used in satellite communication? (A) Yagi-Uda antenna (B) Horn antenna (C) Dipole antenna (D) Parabolic reflector antenna 8. A Yagi-Uda antenna is primarily used for: (A) High-gain applications in a specific direction (B) Omni-directional signal reception (C) Low-frequency transmission (D) Space communication 9. What is the typical radiation pattern of a dipole antenna? (A) Spherical (B) Isotropic (C) Directional cone (D) Figure-eight 10. Which type of wave propagation is used for long-distance communication using the ionosphere? (A) Ground wave propagation (B) Sky wave propagation (C) Space wave propagation (D) Surface wave propagation 11. Ground wave propagation is most effective for: (A) Microwave signals (B) High-frequency signals (C) Low-frequency signals (D) Satellite communication 12. In space wave propagation, the primary limitation is: (A) Line-of-sight requirement (B) Atmospheric absorption (C) Ionospheric reflection (D) Frequency shift 13. Which layer of the ionosphere is primarily responsible for reflecting radio waves back to Earth? (A) F layer (B) E layer (C) D layer (D) G layer 14. The length of a half-wave dipole antenna is approximately equal to: (A) Half the wavelength of the signal (B) Wavelength of the signal (C) Quarter of the wavelength of the signal (D) Twice the wavelength of the signal 15. The bandwidth of an antenna refers to: (A) The power it can radiate (B) The range of frequencies over which it operates effectively (C) The distance it can cover (D) Its impedance matching capability 16. Which of the following antennas is used in Wi-Fi routers? (A) Horn antenna (B) Patch antenna (C) Dipole antenna (D) Parabolic antenna 17. The concept of beamforming is used in antennas to: (A) Focus the signal in a specific direction (B) Reduce interference (C) Increase the antenna’s size (D) Improve impedance matching 18. Which type of wave propagation is dominant in mobile communication systems? (A) Space wave propagation (B) Sky wave propagation (C) Ground wave propagation (D) Tropospheric propagation 19. Which of the following antennas is ideal for satellite TV reception? (A) Log-periodic antenna (B) Parabolic reflector antenna (C) Folded dipole antenna (D) Horn antenna 20. Polarization of an antenna refers to the: (A) Shape of the antenna (B) Frequency of operation (C) Material used in the antenna design (D) Direction of the electric field of the radiated wave