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MCQs

Total Questions : 100 | Page 8 of 10 pages
Question 71. A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is
  1.    10,000 watts
  2.    1,000 watts
  3.    100 watts
  4.    1,000,000 watts
 Discuss Question
Answer: Option C. -> 100 watts
Question 72. When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.
  1.    To the tone of the pulse repetition
  2.    Tune the magnetron to the correct frequency
  3.    Which may be used to tune the radar synchronizer
  4.    Which may be used to tune the radar receiver
 Discuss Question
Answer: Option D. -> Which may be used to tune the radar receiver
Question 73. The coarse frequency adjustment of a reflex klystron is accomplished by
  1.    Adjusting the flexible wall of the resonant cavity
  2.    An adjustment in the synchronizer
  3.    Varying the repeller voltage
  4.    The AFC system
 Discuss Question
Answer: Option A. -> Adjusting the flexible wall of the resonant cavity
Question 74. The frequency of the oscillation generated by a magnetron, is mainly determined by
  1.    The ratio of the dc cathode voltage to the magnetic flux density
  2.    The dimension of each cavity resonator
  3.    The number of the cavity resonators
  4.    The flux density of the external magnet
 Discuss Question
Answer: Option B. -> The dimension of each cavity resonator
Question 75. If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers
  1.    May be decreased
  2.    Must be doubled
  3.    Must remain as before
  4.    Must be increased
 Discuss Question
Answer: Option A. -> May be decreased
Question 76. Which of the following operating frequencies is used for the modern loran navigational system?
  1.    Loran D: 10.2 kHz
  2.    Loran C: 100 kHz
  3.    Loran A: 1950 kHz
  4.    Loran B: 900 kHz
 Discuss Question
Answer: Option B. -> Loran C: 100 kHz
Question 77. A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be
  1.    A decrease in gain
  2.    No noticeable effect
  3.    A decrease in range
  4.    A reduction in horizontal resolution
 Discuss Question
Answer: Option B. -> No noticeable effect
Question 78. The maximum usable range of the usual radar set (on any particular range setting) is determined by
  1.    The bandwidth of the receiver IF stages
  2.    The interval between transmitted pulses
  3.    The width of the transmitted pulses
  4.    The duty cycle
 Discuss Question
Answer: Option B. -> The interval between transmitted pulses
Question 79. Which of the reception problems below that is not due to multipath?
  1.    Slow fading
  2.    Rayleigh fading
  3.    Random Doppler shift
  4.    Delayed spreading
 Discuss Question
Answer: Option A. -> Slow fading
Question 80. A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)
  1.    All of these
  2.    Must be capable of floating or being secured to a survival
  3.    Must have its battery replaced after emergency use
  4.    May be tested during the first five minutes of any hour
 Discuss Question
Answer: Option A. -> All of these

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