Antennas MCQ

Test your knowledge with important Antennas MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Antennas MCQs at Bissoy

• Which of the following statement regarding smart antenna is false?
  ক

  Design of transceiver is complex

  খ

  Smart antennas is more directive

  গ

  Smart antenna is more expensive

  ঘ

  Numeric processors and control systems are not needed in smart antennas
• Which of the following is the drawback of smart antenna?
  ক

  Design of trans-receiver

  খ

  Spacing between base stations

  গ

  Probability of collisions being reduced

  ঘ

  Focused to an intended direction
• Which of the following is benefit of smart antenna?
  ক

  It is easy to tap the connection by the intruder apart from the user

  খ

  Co-Channel interference is less compared to the Omni-directional

  গ

  Design of Trans-receiver is complex

  ঘ

  It cannot be used for location-specific services
• Smart antennas can be used for location-specific service.
  ক

  True

  খ

  False
• Which of the following suffers the co-channel interference most?
  ক

  Smart antennas

  খ

  Sectored antennas

  গ

  Omni-directional

  ঘ

  Both Smart antenna and Omni-direction
• In Smart antennas, signal to interference ratio is low.
  ক

  True

  খ

  False
• Which of the following is not the benefit of smart antenna?
  ক

  It increases the SIR

  খ

  It decreases the SIR

  গ

  It increases the SNR

  ঘ

  Probability of collisions is reduced
• In which of the following type of smart antenna, the performance of the multi-channel fading is limited?
  ক

  Diversity system

  খ

  Omni-directional system

  গ

  Sectored system

  ঘ

  Directional system
• Which of the following is mostly used to generate multiple fixed beams by augmentation in specific orders?
  ক

  Switched Beam array

  খ

  Range gates

  গ

  Conical Scanning

  ঘ

  FMCW radar
• Which of the following is used to distinguish the selected signal and the multipath signal in smart antenna architecture?
  ক

  DSP procedure

  খ

  Switched beam array

  গ

  Range gates

  ঘ

  Delay Cancellers
• Which of the following is not the advantage of smart antenna?
  ক

  Range is increased

  খ

  Secured transmission

  গ

  Design of trans-receiver is simple

  ঘ

  Probability of collisions is reduced
• Which of the following statements is false regarding smart antenna for 802.11 applications?
  ক

  Coverage area is increased

  খ

  Signal paths are reduced

  গ

  Probability of collisions is increased

  ঘ

  Interference is reduced
• The Upper ray is stronger than the lower ray and is mostly preferred for communication.
  ক

  True

  খ

  False
• Which of the following propagation is used when the receiver is beyond the skip distance?
  ক

  Single hop

  খ

  Single hop multi layer

  গ

  Multi hop

  ঘ

  Ground wave
• Find the take-off angle for the flat earth surface with θi = 75.
  ক

  15

  খ

  30

  গ

  105

  ঘ

  75
• The take-off angle for the curved earth surface is given by ____
  ক

  β = 90 – θi – 57.3d/2R

  খ

  β = 180 – θi

  গ

  β = 180 – θi – 57.3d/2R

  ঘ

  β = 90 – θi
• The propagation of wave from transmitter to receiver by touching ground in between them and goes through different layers is called _____
  ক

  Multi-hop single layer

  খ

  Single hop multi layer

  গ

  Multi hop multi layer

  ঘ

  Single hop single layer
• The propagation of wave from transmitter to receiver without touching the ground is called as ___
  ক

  Single hop distance

  খ

  Virtual height

  গ

  Actual height

  ঘ

  Multi-hop
• Which of the following is true when a ray is incident normally in an Ionosphere region?
  ক

  MUF is equal to critical frequency

  খ

  MUF is greater than critical frequency

  গ

  MUF is less than critical frequency

  ঘ

  MUF is zero
• What is the value of maximum usable frequency when the incident angle is 60° and the critical frequency is 4.5MHz?
  ক

  4.5MHz

  খ

  2.25MHz

  গ

  9MHz

  ঘ

  18MHz
• Skip distance is the _____
  ক

  Minimum distance at which wave returns back at the lowest possible frequency

  খ

  Maximum distance at which wave returns back at the critical frequency

  গ

  Minimum distance at which wave returns back at the critical angle

  ঘ

  Maximum distance at which wave returns back at the lowest possible frequency
• Relation between MUF and critical frequency is ______
  ক

  fc = fMUF secθi

  খ

  fMUF = fc sec2 θi

  গ

  fc = fMUF sinθi

  ঘ

  fMUF = fc secθi
• The frequency below which the entire power gets absorbed is called as ____
  ক

  MUF

  খ

  LUF

  গ

  Critical frequency

  ঘ

  Optimum frequency
• If wave exceeds the MUF then it is not reflected back.
  ক

  True

  খ

  False
• The maximum possible frequency for which the wave is reflected back for a given distance of propagation in the ionosphere layer is called as_______
  ক

  Maximum usable frequency

  খ

  Critical frequency

  গ

  Resonance frequency

  ঘ

  Dominating frequency
• When the frequency decreases below _____ frequency, the signal reception becomes too weak and the Noise increases.
  ক

  MUF

  খ

  LUF

  গ

  Optimum frequency

  ঘ

  Critical frequency
• Which of the following frequency is greater than the critical frequency?
  ক

  MUF

  খ

  LUF

  গ

  Optimum frequency

  ঘ

  VLF
• For fMUF ≥ fc, the wave will reflects back irrespective of the angle of incidence.
  ক

  True

  খ

  False
• When a wave is incident normally then the acceptable highest frequency at which signal can be returned is the ______
  ক

  critical frequency

  খ

  LUF

  গ

  optimum frequency

  ঘ

  dominating frequency
• Skip zone is distance between the point where the ground wave reception becomes zero and the sky wave returns for the first time.
  ক

  True

  খ

  False