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MCQs

Total Questions : 100 | Page 2 of 10 pages
Question 11. A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.
  1.    Fathometer
  2.    Echosounder
  3.    LORAN
  4.    SONAR
 Discuss Question
Answer: Option D. -> SONAR
Question 12. Rainfall is an important factor for fading of radio waves at frequencies above
  1.    10 GHz
  2.    100 GHz
  3.    1 GHz
  4.    100 MHz
 Discuss Question
Answer: Option A. -> 10 GHz
Question 13. In a pulsed radar set, the STC circuit is used to
  1.    Improve the target bearing resolution
  2.    Increases receiver sensitivity for echoes from targets
  3.    Vary the pulse frequency in order to control the maximum target
  4.    Reduce interference from the effects of sea return
 Discuss Question
Answer: Option D. -> Reduce interference from the effects of sea return
Question 14. Which causes multipath or frequency selective fading?
  1.    Small reflector
  2.    Nearer reflector
  3.    Further reflector
  4.    Large reflector
 Discuss Question
Answer: Option D. -> Large reflector
Question 15. If k-factor is greater than 1, the array beam is bent
  1.    Away from the earth
  2.    Towards the ionosphere,
  3.    Towards the earth
  4.    Towards the outer space
 Discuss Question
Answer: Option C. -> Towards the earth
Question 16. Klystron oscillators are most often used in the frequency range of
  1.    300 to 3000 MHz
  2.    3000 to 30000 MHz
  3.    30 to 30000 MHz
  4.    10 to 10000 MHz
 Discuss Question
Answer: Option B. -> 3000 to 30000 MHz
Question 17. The main frequency determining element of a klystron is
  1.    The repeller voltage
  2.    The accelerating voltage
  3.    Its resonant cavity
  4.    Its mode of operation
 Discuss Question
Answer: Option C. -> Its resonant cavity
Question 18. Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?
  1.    Isolator
  2.    Wave trap
  3.    Tunnel diode
  4.    Circulator
 Discuss Question
Answer: Option A. -> Isolator
Question 19. As the electron beam moves through a klystron’s intercavity drift space
  1.    Frequency modulation at the input cavity creates velocity modulation at the output cavity
  2.    Velocity modulation at the input cavity creates density modulation at the output cavity
  3.    Density modulation at the input cavity creates velocity modulation at the output cavity
  4.    Phase modulation at the input cavity creates velocity modulation at the output cavity.
 Discuss Question
Answer: Option B. -> Velocity modulation at the input cavity creates density modulation at the output cavity
Question 20. In a pulsed radar set, the function of the duplexer is to
  1.    Aid in calibrating the display unit
  2.    Prevent frequency drift in the klystron
  3.    Allow the transmitter and the receiver to operate from a common antenna
  4.    All of these
 Discuss Question
Answer: Option C. -> Allow the transmitter and the receiver to operate from a common antenna

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