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MCQs

Total Questions : 100 | Page 5 of 10 pages
Question 41. The resonant frequency of a cavity resonator depends upon
  1.    The mode of operation
  2.    Its electrical dimensions
  3.    Its physical dimensions
  4.    The capacitor which tunes it
 Discuss Question
Answer: Option C. -> Its physical dimensions
Question 42. In microwave transmission using digital radio, what causes most intersymbol interference?
  1.    Delayed spreading
  2.    Rayleigh fading
  3.    Random Doppler shift
  4.    Slow fading
 Discuss Question
Answer: Option A. -> Delayed spreading
Question 43. What ferrite device can be used instead of duplexer of isolate microwave transmitter and receiver when both are connected to the same antenna?
  1.    Isolator
  2.    Magnetron
  3.    Simplex
  4.    Circulator
 Discuss Question
Answer: Option D. -> Circulator
Question 44. The cavity resonator
  1.    Is equivalent to an LC resonant circuit
  2.    In a reflect klystron has its output taken from the reflector plate
  3.    Produces a frequency which is independent of the cavity size.
  4.    Has a low Q factor for narrow operation.
 Discuss Question
Answer: Option A. -> Is equivalent to an LC resonant circuit
Question 45. At what position is the input signal inserted into a traveling-wave tube?
  1.    At the cathode end of the helix
  2.    At the collector
  3.    At the collector end of the helix
  4.    At the control grid of the electron gun
 Discuss Question
Answer: Option A. -> At the cathode end of the helix
Question 46. What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
  1.    To accelerate the electron
  2.    To velocity modulate the electron beam
  3.    To keep the electrons from spreading out
  4.    To slow down the signal on the helix
 Discuss Question
Answer: Option C. -> To keep the electrons from spreading out
Question 47. In a radar-set receiver, the usual mixer stage is
  1.    And FET
  2.    A tunnel diode
  3.    A silicon crystal
  4.    A Rochelle salts crystal
 Discuss Question
Answer: Option C. -> A silicon crystal
Question 48. The Gunn diode oscillator
  1.    Is capable of generating continuous microwave power of the order of kilowatt
  2.    Generates frequencies which are below 100 MHz
  3.    Operates over a positive resistance characteristic
  4.    Depends on the formation of charge domain
 Discuss Question
Answer: Option D. -> Depends on the formation of charge domain
Question 49. A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the
  1.    Oscillation will cease
  2.    Output power would increase
  3.    The frequency will decrease
  4.    Bunching would occur earlier in time
 Discuss Question
Answer: Option C. -> The frequency will decrease
Question 50. Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.
  1.    Third
  2.    Fourth
  3.    Fifth
  4.    Sixth
 Discuss Question
Answer: Option D. -> Sixth

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