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MCQs

Total Questions : 100 | Page 6 of 10 pages
Question 51. Coupling into and out of a traveling-wave tube can be accompanied by a
  1.    Cavity match
  2.    Waveguide match
  3.    Direct coax-helix match
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 52. The aquadag coating on the inside of PPI tube is used
  1.    As a second anode and to prevent the build-up of secondary field
  2.    To shield the electron beam from unidirectional magnetic
  3.    All of these
  4.    To focus the beam of primary electrons
 Discuss Question
Answer: Option A. -> As a second anode and to prevent the build-up of secondary field
Question 53. When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have
  1.    The restricted high-frequency response
  2.    Low-pass filters
  3.    The shortest possible time
  4.    A long time constant
 Discuss Question
Answer: Option C. -> The shortest possible time
Question 54. The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)
  1.    S = λR/RL
  2.    S = λR/L
  3.    S = 3λR/L
  4.    S = 2λR/L
 Discuss Question
Answer: Option C. -> S = 3λR/L
Question 55. What allow microwave to pass in only one direction?
  1.    Varactor-triac
  2.    RF emitter
  3.    Ferrite emitter
  4.    Capacitor
 Discuss Question
Answer: Option C. -> Ferrite emitter
Question 56. If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the
  1.    2π mode
  2.    π/2 mode
  3.    π mode
  4.    π/4 mode
 Discuss Question
Answer: Option C. -> π mode
Question 57. Oscillators of a klystron tube are maintained
  1.    By feedback between the accelerating grid and the repeller
  2.    By plate-to-cathode feedback
  3.    By circulating bunches of electrons within the cavities.
  4.    By bunches of electrons passing the cavity grids
 Discuss Question
Answer: Option D. -> By bunches of electrons passing the cavity grids
Question 58. A PPI cathode-ray tube as used on a radar set
  1.    Is used to check the percentage of modulation
  2.    Is used for receiver alignment
  3.    Indicates both the range and azimuth of a target
  4.    Indicates only the range of a target
 Discuss Question
Answer: Option C. -> Indicates both the range and azimuth of a target
Question 59. A high-power microwave pulse of the order of megawatts can be generated by a
  1.    Reflex klystron
  2.    Traveling-wave tube
  3.    Gunn diode
  4.    Magnetron
 Discuss Question
Answer: Option D. -> Magnetron
Question 60. It is possible to increase the maximum range of a radar equipment by
  1.    Raising the peak power of the transmitter
  2.    All of these
  3.    Narrowing the beam width and increasing the pulse duration
  4.    Lowering the pulse frequency
 Discuss Question
Answer: Option B. -> All of these

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