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MCQs

Total Questions : 100 | Page 10 of 10 pages
Question 91. The Gunn diode oscillator
  1.    Depends on the formation of charge domain
  2.    Is capable of generating continuous microwave power of the order of kilowatt
  3.    Generates frequencies which are below 100 MHz
  4.    Operates over a positive resistance characteristic
 Discuss Question
Answer: Option A. -> Depends on the formation of charge domain
Question 92. In a radar-set receiver, the usual mixer stage is
  1.    And FET
  2.    A silicon crystal
  3.    A Rochelle salts crystal
  4.    A tunnel diode
 Discuss Question
Answer: Option B. -> A silicon crystal
Question 93. What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
  1.    To accelerate the electron
  2.    To slow down the signal on the helix
  3.    To keep the electrons from spreading out
  4.    To velocity modulate the electron beam
 Discuss Question
Answer: Option C. -> To keep the electrons from spreading out
Question 94. 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.    Sixth
  2.    Fifth
  3.    Fourth
  4.    Third
 Discuss Question
Answer: Option A. -> Sixth
Question 95. A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the
  1.    Bunching would occur earlier in time
  2.    Output power would increase
  3.    Oscillation will cease
  4.    The frequency will decrease
 Discuss Question
Answer: Option D. -> The frequency will decrease
Question 96. Which of the following is used as a high power microwave oscillator?
  1.    Thyratron
  2.    Reflex-klystron
  3.    Magnetron
  4.    Klystron
 Discuss Question
Answer: Option C. -> Magnetron
Question 97. Microwave frequencies are normally regarded as those in the range of
  1.    1000 to 10,000 GHz
  2.    10 to 1000 GHz
  3.    1 to 500 MHz
  4.    1 to 100 GHz
 Discuss Question
Answer: Option D. -> 1 to 100 GHz
Question 98. Which of the following is used as an oscillator device in the SHF band?
  1.    Both B and C
  2.    Klystron tube
  3.    Tunnel diode
  4.    Thyratron tube
 Discuss Question
Answer: Option A. -> Both B and C
Question 99. __________ is the progressive decrease of signal strength with increasing distance.
  1.    Attenuation
  2.    Radiation
  3.    Propagation
  4.    Modulation
 Discuss Question
Answer: Option A. -> Attenuation
Question 100. What do you call an attenuation that occurs over many different wavelengths of the carrier?
  1.    Slow fading
  2.    Rician fading
  3.    Wavelength fading
  4.    Rayleigh fading
 Discuss Question
Answer: Option A. -> Slow fading

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