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MCQs

Total Questions : 55 | Page 4 of 6 pages
Question 31. MUF is depend upon
  1.    Electron density of the ionospheric layer
  2.    11 year sun spot cycle
  3.    Received frequency by receiver
  4.    Height of ionospheric layer
 Discuss Question
Answer: Option C. -> Received frequency by receiver
Question 32. The radiation pattern of loop antenna is
  1.    Circle
  2.    Semicircle
  3.    Elliptical
  4.    Cardoid or Limacon
 Discuss Question
Answer: Option D. -> Cardoid or Limacon
Question 33. When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
  1.    The value of current
  2.    The weight of the conductor
  3.    The direction of the conductor
  4.    None of the above
 Discuss Question
Answer: Option A. -> The value of current
Question 34. If a and b are the dimensions of waveguide then
  1.    a = 3b
  2.    a = 2b
  3.    a = b
  4.    a = b/4
 Discuss Question
Answer: Option B. -> a = 2b
Question 35. When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
  1.    Reflection
  2.    Refraction
  3.    Transmission
  4.    None of the above
 Discuss Question
Answer: Option B. -> Refraction
Question 36. Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
  1.    Dust particles may not accumulate
  2.    Charge per unit area becomes very high for lightening to discharge
  3.    Rain drops may not collect
  4.    None of the above
 Discuss Question
Answer: Option B. -> Charge per unit area becomes very high for lightening to discharge
Question 37. The useful magnetic flux obtainable from any closed surface is
  1.    Unity
  2.    Constant
  3.    Both A and B
  4.    None of the above
 Discuss Question
Answer: Option D. -> None of the above
Question 38. When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
  1.    Scattering
  2.    Polarisation
  3.    Absorption
  4.    Dispersion
 Discuss Question
Answer: Option B. -> Polarisation
Question 39. A satellite that simply reflect back the signals from one region of the earth to the other region is known as
  1.    Orbiting satellite
  2.    Geostationary satellite
  3.    Active satellite
  4.    Passive satellite
 Discuss Question
Answer: Option D. -> Passive satellite
Question 40. The main disadvantage of the two-hole directional coupler is
  1.    Poor directivity
  2.    Narrow bandwidth
  3.    High standing wave ratio
  4.    Low directional coupling
 Discuss Question
Answer: Option B. -> Narrow bandwidth

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