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MCQs

Total Questions : 100 | Page 9 of 10 pages
Question 81. Calculate the effective earth’s radius if the surface refractivity is 301.
  1.    6370 km
  2.    6370 mi
  3.    8493 km
  4.    8493 mmi
 Discuss Question
Answer: Option C. -> 8493 km
Question 82. A traveling-wave tube (TWT) amplifies by virtue of
  1.    The energy contained the cavity resonators
  2.    The effect of an external magnetic field
  3.    The energy liberated form the collector
  4.    The absorption of energy by the signal from an electron stream
 Discuss Question
Answer: Option D. -> The absorption of energy by the signal from an electron stream
Question 83. In an SHF pulsed radar set, a reflex klystron can be used as a
  1.    Local oscillator
  2.    Single mixer stage
  3.    Transmitter oscillator
  4.    Duplexer stage
 Discuss Question
Answer: Option A. -> Local oscillator
Question 84. To achieve good bearing resolution when using a pulsed-radar set, an important requirement is
  1.    A high duty cycle
  2.    A narrow, antenna-beam width in the horizontal plane
  3.    A low repetition rate
  4.    A narrow, antenna-beam width in the vertical plane
 Discuss Question
Answer: Option B. -> A narrow, antenna-beam width in the horizontal plane
Question 85. The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the
  1.    Distributed lead inductance
  2.    Electron transit time
  3.    Inter-electrode capacitance
  4.    Degree of emission from the cathode
 Discuss Question
Answer: Option D. -> Degree of emission from the cathode
Question 86. What ferrite device can be used instead of duplexer of isolate microwave transmitter and receiver when both are connected to the same antenna?
  1.    Circulator
  2.    Magnetron
  3.    Simplex
  4.    Isolator
 Discuss Question
Answer: Option A. -> Circulator
Question 87. The resonant frequency of a cavity resonator depends upon
  1.    The capacitor which tunes it
  2.    The mode of operation
  3.    Its physical dimensions
  4.    Its electrical dimensions
 Discuss Question
Answer: Option C. -> Its physical dimensions
Question 88. The cavity resonator
  1.    In a reflect klystron has its output taken from the reflector plate
  2.    Is equivalent to an LC resonant circuit
  3.    Produces a frequency which is independent of the cavity size.
  4.    Has a low Q factor for narrow operation.
 Discuss Question
Answer: Option B. -> Is equivalent to an LC resonant circuit
Question 89. In microwave transmission using digital radio, what causes most intersymbol interference?
  1.    Random Doppler shift
  2.    Rayleigh fading
  3.    Slow fading
  4.    Delayed spreading
 Discuss Question
Answer: Option D. -> Delayed spreading
Question 90. At what position is the input signal inserted into a traveling-wave tube?
  1.    At the collector end of the helix
  2.    At the collector
  3.    At the cathode end of the helix
  4.    At the control grid of the electron gun
 Discuss Question
Answer: Option C. -> At the cathode end of the helix

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