Reflector Antenna MCQ

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

• In which of the following feed there is no impedance mismatch?
  ক

  Offset feed

  খ

  Cassegrain feed

  গ

  Front feed

  ঘ

  Gregorian feed
• Large f/D ratio is used for deep-dish reflectors.
  ক

  True

  খ

  False
• Which of the following is formed by moving parabolic counter parallel to itself?
  ক

  Parabolic cylinder

  খ

  Pill box

  গ

  Cheese antenna

  ঘ

  Truncated antenna
• Which of the following antenna is a combination of pillbox and parabolic cylinder?
  ক

  Cheese antenna

  খ

  Orange peel antenna

  গ

  Corner antenna

  ঘ

  Cassegrain
• Cassegrain antennas cannot be used in radio telescopes.
  ক

  True

  খ

  False
• In which of the following secondary reflector is convex?
  ক

  Gregorian

  খ

  Cassegrain

  গ

  Parabolic

  ঘ

  Corner
• In which of the following secondary reflector is concave?
  ক

  Gregorian

  খ

  Cassegrain

  গ

  Parabolic

  ঘ

  Corner
• Which of the following reflector antenna doesn’t require a directive feed?
  ক

  Parabolic

  খ

  Hyperbolic

  গ

  Corner

  ঘ

  Truncated
• Which type of feed in parabolic antenna blocks the beam limiting aperture efficiency to 55%?
  ক

  Axial feed

  খ

  Offset feed

  গ

  Cassegrain

  ঘ

  Gregorian
• Which of the following statements is false about Array-fed antenna?
  ক

  It is widely used to create a downlink radiation in satellite communication

  খ

  An array of feed horns are clustered at focal point to produce arbitrary shaped beam

  গ

  It uses only a single horn feed and a multiple array of passive reflectors

  ঘ

  It can also be used with secondary reflector antennas
• Which of the following antenna has a shape of letter ‘C’?
  ক

  Orange peel antenna

  খ

  Pill box

  গ

  Yagi-Uda antenna

  ঘ

  Wire dipole
• Which one of the following antennas is mostly used in TV Dish?
  ক

  Parabolic reflector

  খ

  Lens antenna

  গ

  Log periodic

  ঘ

  Rhombus antenna
• In Polarization-twist reflector, sub-reflector consists of a horizontal grating of wires.
  ক

  True

  খ

  False
• Which of the following condition holds good for minimum total aperture blocking in Cassegrain?
  ক

  Area of sub-reflector and projected area of feed are equal

  খ

  Area of primary reflector and projected area of feed are equal

  গ

  Area of sub-reflector greater than area of primary reflector

  ঘ

  Area of sub-reflector is less than projected area of feed
• Which of the following is not used for aperture blocking?
  ক

  Reducing size of sub-reflector

  খ

  Offset feed system

  গ

  High directive feed

  ঘ

  Reducing spillover
• In which of the following a sub-reflector called trans-reflector is present?
  ক

  Polarization-twist reflector

  খ

  Plane reflector

  গ

  Cassegrain

  ঘ

  Gregorian
• In which of the following the aperture blocking is reduced by permitting antenna to operate in a single polarization?
  ক

  Truncated reflector

  খ

  Cassegrain

  গ

  Polarization-twist reflector

  ঘ

  Plane reflector
• Which of the following statement is true regarding a Gregorian antenna?
  ক

  Sub-reflector ellipsoidal lies closer to the focus of the paraboloid

  খ

  Sub-reflector is a hyperboloid with its convex facing feed

  গ

  Sub-reflector is an ellipsoidal with its concave facing reflector

  ঘ

  Sub-reflector is an ellipsoidal with its concave facing feed
• In which of the following the secondary reflector faces the primary reflector?
  ক

  Cassegrain

  খ

  Gregorian

  গ

  Corner reflector

  ঘ

  Plane reflector
• Which of the following causes aperture blockage in a Cassegrain antenna?
  ক

  Main reflector

  খ

  Sub-reflector

  গ

  Feed radiator

  ঘ

  Noise from surroundings
• Which of the following is used to avoid the aperture blockage due to secondary reflector?
  ক

  Offset feed system

  খ

  Cassegrain

  গ

  Plane reflector

  ঘ

  Parabolic antenna
• Which of the following uses a concave sub-reflector in a dual reflector antenna?
  ক

  Cassegrain

  খ

  Gregorian

  গ

  Both Gregorian &Cassegrain

  ঘ

  Neither Gregorian nor Cassegrain
• When a dipole with a parasitic reflector is used as a feed system, the distance between them is _____
  ক

  0.125λ

  খ

  0.4λ

  গ

  1λ

  ঘ

  0.625λ
• Which of the following regarding the Cassegrain feed system is false?
  ক

  Spill over is reduced

  খ

  It is a dual reflector antenna

  গ

  Minor lobe radiation increases

  ঘ

  A convex sub-reflector is used
• Which of the following coincides with the focus of the parabolic reflector in a Cassegrain antenna?
  ক

  Feed

  খ

  Parabolic reflector

  গ

  Focus of hyperboloid reflector

  ঘ

  Focus of primary radiator
• In a Cassegrain feed system; the feed is placed at _____
  ক

  Focus

  খ

  Vertex

  গ

  Directrix

  ঘ

  Anywhere between vertex and focus
• The beam gets deteriorated when it is moved along a line perpendicular to the main axis passing through focus?
  ক

  True

  খ

  False
• When the feed is moved along the main axis in a reflector antenna what happens to the beam pattern?
  ক

  It broadens

  খ

  It deteriorates

  গ

  Beam remains unchanged

  ঘ

  Side lobes are increased
• To obtain maximum beam pattern, the primary radiator is placed ______ in a reflector antenna.
  ক

  between Focus and Directrix

  খ

  after the focus

  গ

  at the focus point

  ঘ

  can be placed anywhere
• In which of the following cases, a parabolic reflector primary radiator is said to be ideal feed?
  ক

  The entire reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

  খ

  Some part of reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

  গ

  Some part of reflector is illuminated with radiation in unwanted direction when feed radiated entire energy towards it

  ঘ

  The entire reflector is illuminated with small radiation in unwanted direction when feed radiated entire energy towards it