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MCQs

Total Questions : 55 | Page 2 of 6 pages
Question 11. Tropospheric scatter propagation is not subject to any fading.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 12. A square corner reflector is used in which of the following?
  1.    TV broadcast
  2.    Point-to-point communication
  3.    Radio astronomy
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 13. In case of surface waves the field strength at a point is directly proportional to
  1.    Antenna height
  2.    Wave frequency
  3.    Current of the antenna
  4.    Distance of the point from the antenna
 Discuss Question
Answer: Option D. -> Distance of the point from the antenna
Question 14. In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to
  1.    Decrease in the value of reactance
  2.    An increase in the value of reactance
  3.    No change in the reactance value
  4.    No change in the impedance value
 Discuss Question
Answer: Option B. -> An increase in the value of reactance
Question 15. The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a
  1.    Null
  2.    Circle
  3.    Figure of eight
  4.    None of the above
 Discuss Question
Answer: Option C. -> Figure of eight
Question 16. In a perfect conductor the incident and reflected wave combine to produce
  1.    A stronger incident wave
  2.    A stronger reflected wave
  3.    A standing wave which is not progressing
  4.    None of the above
 Discuss Question
Answer: Option C. -> A standing wave which is not progressing
Question 17. It is best to use for coupling a coaxial line to a parallel wire transmission line.
  1.    Directional Coupler
  2.    Balun
  3.    Slotted line
  4.    Tee
 Discuss Question
Answer: Option B. -> Balun
Question 18. In H-plane metal plate lens the travelling wave front is
  1.    Totally retarded
  2.    Retarded
  3.    Accelerated
  4.    Neither accelerated nor retarded
 Discuss Question
Answer: Option B. -> Retarded
Question 19. Which of the following is multiband HF receiving antenna?
  1.    Square loop
  2.    Log-periodic
  3.    Conical horn
  4.    Folded dipole
 Discuss Question
Answer: Option B. -> Log-periodic
Question 20. An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 O. The standing wave ratio will be
  1.    1.5
  2.    2.5
  3.    3.5
  4.    4.5
 Discuss Question
Answer: Option A. -> 1.5

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