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MCQs

Total Questions : 55 | Page 5 of 6 pages
Question 41. A square corner reflector is used in
  1.    Radio astronomy
  2.    Tv broadcast
  3.    Point to point communication
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 42. The power gain of a half-wave dipole with respect to an isotropic radiator is
  1.    2.15 db
  2.    3 db
  3.    4.15 db
  4.    6 db
 Discuss Question
Answer: Option A. -> 2.15 db
Question 43. In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include
  1.    Antenna replacement and feed correction
  2.    Amplitude timing and phase correction
  3.    Polarization shifting and code diversity
  4.    Path diversity and frequency diversity
 Discuss Question
Answer: Option D. -> Path diversity and frequency diversity
Question 44. The attenuation in waveguide above to cut off frequency
  1.    Very high
  2.    Very low
  3.    Zero
  4.    Infinite
 Discuss Question
Answer: Option B. -> Very low
Question 45. MUF is highest in periods of greatest sunspot activity.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 46. A waveguide operated below cut off frequency can be used as
  1.    Phase shifter
  2.    An attenuator
  3.    An isolator
  4.    None
 Discuss Question
Answer: Option B. -> An attenuator
Question 47. The wave in wave guide has
  1.    Group velocity inversely proportional to wavelength
  2.    Larger frequency than in the free space
  3.    Diminishing wavelength than in the free space
  4.    Larger wavelength than in the free space
 Discuss Question
Answer: Option D. -> Larger wavelength than in the free space
Question 48. Radiation intensity in a given direction is the
  1.    Energy radiated per square metre
  2.    Power radiated per square metre
  3.    Power radiated per unit solid angle in that direction
  4.    None of the above
 Discuss Question
Answer: Option C. -> Power radiated per unit solid angle in that direction
Question 49. Which of the following impedance inversion is obtained?
  1.    Short-circuited stub
  2.    A quarter wave line
  3.    Balun transformer
  4.    A half wave line
 Discuss Question
Answer: Option B. -> A quarter wave line
Question 50. When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.
  1.    Yes
  2.    No
 Discuss Question
Answer: Option B. -> No

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