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MCQs

Total Questions : 55 | Page 3 of 6 pages
Question 21. The critical frequency of ‘F’ layer is greater than 30 MHz.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 22. Which of the following statement regarding waveguides is incorrect?
  1.    At waveguide can be coupled to a coaxial cable
  2.    At frequencies below the cut off value the wave progresses across the waveguide after total reflections
  3.    Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
  4.    Waveguides can handle large power at UHF and microwaves
 Discuss Question
Answer: Option A. -> At waveguide can be coupled to a coaxial cable
Question 23. A rectangular waveguide is a
  1.    Rectangular conducting wire to propagate electromagnetic waves
  2.    Hollow rectangular walled room carrying electromagnetic wave
  3.    Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed
  4.    Tube antenna to transmit and receive electromagnetic waves
 Discuss Question
Answer: Option C. -> Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed
Question 24. Tropospheric scatter is used with frequencies in the
  1.    HF
  2.    VHF
  3.    UHF
  4.    VLF
 Discuss Question
Answer: Option C. -> UHF
Question 25. A Yagi antenna has a driven antenna
  1.    Only
  2.    With a reflector
  3.    With one or more directors
  4.    With a reflector and one or more directors
 Discuss Question
Answer: Option D. -> With a reflector and one or more directors
Question 26. In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as
  1.    Transmission efficiency
  2.    Front to back ratio
  3.    Loss coefficient
  4.    None of the above
 Discuss Question
Answer: Option B. -> Front to back ratio
Question 27. The frequency range for satellite communication is
  1.    3 to 30 kHz
  2.    300 to 3000 kHz
  3.    3000 to 30000 MHz
  4.    30000 to 300000 MHz
 Discuss Question
Answer: Option C. -> 3000 to 30000 MHz
Question 28. The static electric field in a conductor is
  1.    Zero
  2.    Unity
  3.    Infinity
  4.    None of the above
 Discuss Question
Answer: Option A. -> Zero
Question 29. The skip distance is the maximum distance upto which ionospheric reflection is possible.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 30. Parabolic and lens antenna used at
  1.    Microwave frequency
  2.    Medium frequency
  3.    Low frequency
  4.    High frequency
 Discuss Question
Answer: Option A. -> Microwave frequency

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