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MCQs

Total Questions : 147 | Page 1 of 15 pages
Question 1.   The number of lobes on each side of a 3 X resonant antenna is
  1.    3
  2.    6
  3.    2
  4.    1
 Discuss Question
Answer: Option A. -> 3
Question 2.   A quarter-wave monopole at a frequency of one MHz has a length of metre.
  1.    1
  2.    75
  3.    150
  4.    300
 Discuss Question
Answer: Option B. -> 75
Question 3.   A parasitic element of an array is one which
  1.    is directly connected to the transmitter output
  2.    is spaced X18 from driven element
  3.    increases signal strength in its own direction
  4.    acts as a reflector or director depending on whether it is longer or shorter than the driven element
 Discuss Question
Answer: Option D. -> acts as a reflector or director depending on whether it is longer or shorter than the driven element
Question 4.   A half-wave dipole at a frequency of 100 MHz has a length of metre.
  1.    100
  2.    3
  3.    1.5
  4.    0.75
 Discuss Question
Answer: Option C. -> 1.5
Question 5.   Which statement regarding end-fire array is wrong?
  1.    there is no radiation at right angles to the plane of the array
  2.    it has a dipole spacing of X/2
  3.    it is called a linear resonant dipole array
  4.    it has narrow bandwidth
 Discuss Question
Answer: Option B. -> it has a dipole spacing of X/2
Question 6.   Radiation resistance of a half-wave folded dipole is ohm.
  1.    72
  2.    144
  3.    288
  4.    216
 Discuss Question
Answer: Option C. -> 288
Question 7.   Which statement ragarding the Yagi-Uda antenna is wrong?
  1.    it is an array consisting of a driven element and parasitic elements arranged collinearly and closely
  2.    it has extremely high gain
  3.    it has a folded dipole as the driven element
  4.    it is often employed as VHF television receiving antenna
 Discuss Question
Answer: Option B. -> it has extremely high gain
Question 8.  Antennas commonly used for microwave links are
  1.    loop antennas
  2.    log-periodic antennas
  3.    paraboloidal dishes
  4.    rhombic antennas
 Discuss Question
Answer: Option C. -> paraboloidal dishes
Question 9. . A loop antenna is commonly used for
  1.    radar
  2.    direction finding
  3.    satellite communication
  4.    aeronautical Engg.
 Discuss Question
Answer: Option B. -> direction finding
Question 10. . Which one of the following is a low-gain but omnidirectional antenna?
  1.    discone
  2.    log-periodic
  3.    loop
  4.    helical
 Discuss Question
Answer: Option A. -> discone

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