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MCQs

Total Questions : 100 | Page 3 of 10 pages
Question 21. What do you call an attenuation that occurs over many different wavelengths of the carrier?
  1.    Rayleigh fading
  2.    Rician fading
  3.    Wavelength fading
  4.    Slow fading
 Discuss Question
Answer: Option D. -> Slow fading
Question 22. Microwave frequencies are normally regarded as those in the range of
  1.    1 to 500 MHz
  2.    1000 to 10,000 GHz
  3.    1 to 100 GHz
  4.    10 to 1000 GHz
 Discuss Question
Answer: Option C. -> 1 to 100 GHz
Question 23. Which of the following is used as an oscillator device in the SHF band?
  1.    Thyratron tube
  2.    Tunnel diode
  3.    Klystron tube
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 24. Which of the following is used as a high power microwave oscillator?
  1.    Thyratron
  2.    Magnetron
  3.    Klystron
  4.    Reflex-klystron
 Discuss Question
Answer: Option B. -> Magnetron
Question 25. __________ is the progressive decrease of signal strength with increasing distance.
  1.    Radiation
  2.    Attenuation
  3.    Modulation
  4.    Propagation
 Discuss Question
Answer: Option B. -> Attenuation
Question 26. 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.    100 watts
  3.    1,000 watts
  4.    1,000,000 watts
 Discuss Question
Answer: Option B. -> 100 watts
Question 27. 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.    Must remain as before
  2.    Must be increased
  3.    May be decreased
  4.    Must be doubled
 Discuss Question
Answer: Option C. -> May be decreased
Question 28. The frequency of the oscillation generated by a magnetron, is mainly determined by
  1.    The flux density of the external magnet
  2.    The ratio of the dc cathode voltage to the magnetic flux density
  3.    The number of the cavity resonators
  4.    The dimension of each cavity resonator
 Discuss Question
Answer: Option D. -> The dimension of each cavity resonator
Question 29. When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.
  1.    Which may be used to tune the radar synchronizer
  2.    Which may be used to tune the radar receiver
  3.    To the tone of the pulse repetition
  4.    Tune the magnetron to the correct frequency
 Discuss Question
Answer: Option B. -> Which may be used to tune the radar receiver
Question 30. The coarse frequency adjustment of a reflex klystron is accomplished by
  1.    The AFC system
  2.    Adjusting the flexible wall of the resonant cavity
  3.    An adjustment in the synchronizer
  4.    Varying the repeller voltage
 Discuss Question
Answer: Option B. -> Adjusting the flexible wall of the resonant cavity

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