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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 11 of 39 pages
Question 101. 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 102. 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.    3.5
  2.    1.5
  3.    4.5
  4.    2.5
 Discuss Question
Answer: Option B. -> 1.5
Question 103. Which of the following is multiband HF receiving antenna?
  1.    Log-periodic
  2.    Conical horn
  3.    Square loop
  4.    Folded dipole
 Discuss Question
Answer: Option A. -> Log-periodic
Question 104. It is best to use for coupling a coaxial line to a parallel wire transmission line.
  1.    Directional Coupler
  2.    Slotted line
  3.    Balun
  4.    Tee
 Discuss Question
Answer: Option C. -> Balun
Question 105. In a perfect conductor the incident and reflected wave combine to produce
  1.    A standing wave which is not progressing
  2.    None of these
  3.    A stronger reflected wave
  4.    A stronger incident wave
 Discuss Question
Answer: Option A. -> A standing wave which is not progressing
Question 106. Tropospheric scatter is used with frequencies in the
  1.    HF
  2.    VHF
  3.    UHF
  4.    VLF
 Discuss Question
Answer: Option C. -> UHF
Question 107. The critical frequency of ‘F’ layer is greater than 30 MHz.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 108. A Yagi antenna has a driven antenna
  1.    Only
  2.    With a reflector and one or more directors
  3.    With one or more directors
  4.    With a reflector
 Discuss Question
Answer: Option B. -> With a reflector and one or more directors
Question 109. A rectangular waveguide is a
  1.    Rectangular conducting wire to propagate electromagnetic waves
  2.    Tube antenna to transmit and receive electromagnetic waves
  3.    Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed
  4.    Hollow rectangular walled room carrying electromagnetic wave
 Discuss Question
Answer: Option C. -> Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed
Question 110. Which of the following statement regarding waveguides is incorrect?
  1.    Waveguides can handle large power at UHF and microwaves
  2.    Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
  3.    At frequencies below the cut off value the wave progresses across the waveguide after total reflections
  4.    At waveguide can be coupled to a coaxial cable
 Discuss Question
Answer: Option D. -> At waveguide can be coupled to a coaxial cable

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