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MCQs

Total Questions : 100 | Page 4 of 10 pages
Question 31. Which of the following operating frequencies is used for the modern loran navigational system?
  1.    Loran C: 100 kHz
  2.    Loran D: 10.2 kHz
  3.    Loran A: 1950 kHz
  4.    Loran B: 900 kHz
 Discuss Question
Answer: Option A. -> Loran C: 100 kHz
Question 32. The maximum usable range of the usual radar set (on any particular range setting) is determined by
  1.    The width of the transmitted pulses
  2.    The interval between transmitted pulses
  3.    The bandwidth of the receiver IF stages
  4.    The duty cycle
 Discuss Question
Answer: Option B. -> The interval between transmitted pulses
Question 33. A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)
  1.    Must be capable of floating or being secured to a survival
  2.    Must have its battery replaced after emergency use
  3.    May be tested during the first five minutes of any hour
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 34. 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 range
  2.    A reduction in horizontal resolution
  3.    No noticeable effect
  4.    A decrease in gain
 Discuss Question
Answer: Option C. -> No noticeable effect
Question 35. Which of the reception problems below that is not due to multipath?
  1.    Delayed spreading
  2.    Rayleigh fading
  3.    Random Doppler shift
  4.    Slow fading
 Discuss Question
Answer: Option D. -> Slow fading
Question 36. A traveling-wave tube (TWT) amplifies by virtue of
  1.    The absorption of energy by the signal from an electron stream
  2.    The effect of an external magnetic field
  3.    The energy contained the cavity resonators
  4.    The energy liberated form the collector
 Discuss Question
Answer: Option A. -> The absorption of energy by the signal from an electron stream
Question 37. Calculate the effective earth’s radius if the surface refractivity is 301.
  1.    8493 km
  2.    8493 mmi
  3.    6370 km
  4.    6370 mi
 Discuss Question
Answer: Option A. -> 8493 km
Question 38. To achieve good bearing resolution when using a pulsed-radar set, an important requirement is
  1.    A narrow, antenna-beam width in the vertical plane
  2.    A narrow, antenna-beam width in the horizontal plane
  3.    A low repetition rate
  4.    A high duty cycle
 Discuss Question
Answer: Option B. -> A narrow, antenna-beam width in the horizontal plane
Question 39. In an SHF pulsed radar set, a reflex klystron can be used as a
  1.    Single mixer stage
  2.    Local oscillator
  3.    Transmitter oscillator
  4.    Duplexer stage
 Discuss Question
Answer: Option B. -> Local oscillator
Question 40. The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the
  1.    Electron transit time
  2.    Distributed lead inductance
  3.    Inter-electrode capacitance
  4.    Degree of emission from the cathode
 Discuss Question
Answer: Option D. -> Degree of emission from the cathode

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