Antennas and wave propagation MCQs

  1. What is the primary function of an antenna?
    A. To amplify signals
    B. To convert electrical signals into electromagnetic waves and vice versa
    C. To filter noise from a signal
    D. To provide impedance matching

    Answer: B

  2. Which of the following is NOT a type of antenna?
    A. Dipole antenna
    B. Parabolic antenna
    C. Quartz antenna
    D. Loop antenna

    Answer: C

  3. The radiation pattern of an antenna is a graphical representation of:
    A. Power distribution as a function of distance
    B. The impedance of the antenna
    C. Power distribution as a function of direction
    D. Frequency variation over time

    Answer: C

  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

    Answer: B

  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

    Answer: B

  6. The directivity of an antenna refers to:
    A. The maximum gain of the antenna
    B. The ability to focus energy in a specific direction
    C. The radiation resistance of the antenna
    D. The bandwidth of the antenna

    Answer: B

  7. Which type of antenna is commonly used in satellite communication?
    A. Yagi-Uda antenna
    B. Horn antenna
    C. Parabolic reflector antenna
    D. Dipole antenna

    Answer: C

  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

    Answer: A

  9. What is the typical radiation pattern of a dipole antenna?
    A. Spherical
    B. Figure-eight
    C. Directional cone
    D. Isotropic

    Answer: B

  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

    Answer: B

  11. Ground wave propagation is most effective for:
    A. Low-frequency signals
    B. High-frequency signals
    C. Microwave signals
    D. Satellite communication

    Answer: A

  12. In space wave propagation, the primary limitation is:
    A. Atmospheric absorption
    B. Line-of-sight requirement
    C. Ionospheric reflection
    D. Frequency shift

    Answer: B

  13. Which layer of the ionosphere is primarily responsible for reflecting radio waves back to Earth?
    A. D layer
    B. E layer
    C. F layer
    D. G layer

    Answer: C

  14. The length of a half-wave dipole antenna is approximately equal to:
    A. Wavelength of the signal
    B. Half the wavelength of the signal
    C. Quarter of the wavelength of the signal
    D. Twice the wavelength of the signal

    Answer: B

  15. The bandwidth of an antenna refers to:
    A. The range of frequencies over which it operates effectively
    B. The power it can radiate
    C. The distance it can cover
    D. Its impedance matching capability

    Answer: A

  16. Which of the following antennas is used in Wi-Fi routers?
    A. Horn antenna
    B. Dipole antenna
    C. Patch antenna
    D. Parabolic antenna

    Answer: C

  17. The concept of beamforming is used in antennas to:
    A. Reduce interference
    B. Focus the signal in a specific direction
    C. Increase the antenna’s size
    D. Improve impedance matching

    Answer: B

  18. Which type of wave propagation is dominant in mobile communication systems?
    A. Ground wave propagation
    B. Sky wave propagation
    C. Space wave propagation
    D. Tropospheric propagation

    Answer: C

  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

    Answer: B

  20. Polarization of an antenna refers to the:
    A. Shape of the antenna
    B. Direction of the electric field of the radiated wave
    C. Material used in the antenna design
    D. Frequency of operation

    Answer: B

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