Antenna Theory & Wave Propagation- Online Test 4

15 Questions

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Antenna Theory & Wave Propagation- Online Test 4

The quiz below is the fourth and final one in a series of tests aimed at testing out how much you understand on antenna theory and wave propagation. Give it a try and do come back for more quizzes to help you in your end year applied physics exams.


Questions and Answers
  • 1. 
    What is the radiation characteristic of a dipole antenna? 
    • A. 

      Omnidirectional

    • B. 

      Bidirectional

    • C. 

      Unidirectional

    • D. 

      Hemispherical

  • 2. 
    An antenna with unity gain
    • A. 

      Rhombic

    • B. 

      Half-wave dipole

    • C. 

      Isotropic

    • D. 

      Whip

  • 3. 
    What is the theoretical gain of a Hertzian dipole? 
    • A. 

      1.76 dB

    • B. 

      2.15 dB

    • C. 

      3 dB

    • D. 

      0 dB

  • 4. 
    • A. 

      By adding several antennas in parallel

    • B. 

      By adding several antennas in parallel

    • C. 

      By making antenna rods thicker

    • D. 

      By making the antenna size larger

  • 5. 
    An antenna which is one-tenth wavelength long 
    • A. 

      Hertzian dipole

    • B. 

      Loop antenna

    • C. 

      Marconi antenna

    • D. 

      Elementary doublet

  • 6. 
    What is the minimum number of turns a helix antenna must have? 
    • A. 

      3

    • B. 

      5

    • C. 

      4

    • D. 

      6

  • 7. 
    What is the gain of isotropic antenna? 
    • A. 

      10

    • B. 

      1

    • C. 

      100

    • D. 

      1000

  • 8. 
    The length of a Marconi antenna to operate with 985 kHz is ______. 
    • A. 

      200 ft

    • B. 

      500 ft

    • C. 

      250 ft

    • D. 

      999 ft

  • 9. 
    What is the front-to-back ratio of an antenna which radiates 500 watts in a north direction and 50 watts in south direction? 
    • A. 

      25000 dB

    • B. 

      10 dB

    • C. 

      100 dB

    • D. 

      20 dB

  • 10. 
    Which of the following improves antenna directivity? 
    • A. 

      Driven element

    • B. 

      Reflector element

    • C. 

      Director element

    • D. 

      Parasitic element

  • 11. 
    The antenna radiates _____ polarized waves when the transmitter antenna is horizontally installed. 
    • A. 

      Vertically

    • B. 

      Negatively

    • C. 

      Horizontally

    • D. 

      Circularly

  • 12. 
    . If 4 kW in antenna produces 50 μV/m in a receiving antenna, a 15 kW will produce _____. 
    • A. 

      200 μV/m

    • B. 

      10 μV/m

    • C. 

      100 μV/m

    • D. 

      20 μV/m

  • 13. 
    If the radiated power increase 10.89 times, the antenna current increases by ______. 
    • A. 

      3.3 times

    • B. 

      6.6 times

    • C. 

      1.82 times

    • D. 

      10.89 times

  • 14. 
    The frequency of operation of a dipole antenna cut to a length of 3.4 m. 
    • A. 

      88 MHz

    • B. 

      44 MHz

    • C. 

      22 MHz

    • D. 

      11 MHz

  • 15. 
    Comparing the signal strength arriving at the driven element from the desired direction to the signal strength reaching the driver from the opposite direction.
    • A. 

      Directivity

    • B. 

      Sensitivity

    • C. 

      Beamwidth

    • D. 

      Front-to-back ratio