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MCQs

Total Questions : 100 | Page 7 of 10 pages
Question 61. If k-factor is greater than 1, the array beam is bent
  1.    Away from the earth
  2.    Towards the outer space
  3.    Towards the ionosphere,
  4.    Towards the earth
 Discuss Question
Answer: Option D. -> Towards the earth
Question 62. Rainfall is an important factor for fading of radio waves at frequencies above
  1.    100 MHz
  2.    100 GHz
  3.    10 GHz
  4.    1 GHz
 Discuss Question
Answer: Option C. -> 10 GHz
Question 63. In a pulsed radar set, the STC circuit is used to
  1.    Vary the pulse frequency in order to control the maximum target
  2.    Increases receiver sensitivity for echoes from targets
  3.    Reduce interference from the effects of sea return
  4.    Improve the target bearing resolution
 Discuss Question
Answer: Option C. -> Reduce interference from the effects of sea return
Question 64. Which causes multipath or frequency selective fading?
  1.    Large reflector
  2.    Further reflector
  3.    Nearer reflector
  4.    Small reflector
 Discuss Question
Answer: Option A. -> Large reflector
Question 65. A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.
  1.    Fathometer
  2.    SONAR
  3.    LORAN
  4.    Echosounder
 Discuss Question
Answer: Option B. -> SONAR
Question 66. Klystron oscillators are most often used in the frequency range of
  1.    300 to 3000 MHz
  2.    30 to 30000 MHz
  3.    10 to 10000 MHz
  4.    3000 to 30000 MHz
 Discuss Question
Answer: Option D. -> 3000 to 30000 MHz
Question 67. 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.    Tunnel diode
  2.    Isolator
  3.    Wave trap
  4.    Circulator
 Discuss Question
Answer: Option B. -> Isolator
Question 68. As the electron beam moves through a klystron’s intercavity drift space
  1.    Velocity modulation at the input cavity creates density modulation at the output cavity
  2.    Density modulation at the input cavity creates velocity modulation at the output cavity
  3.    Phase modulation at the input cavity creates velocity modulation at the output cavity.
  4.    Frequency modulation at the input cavity creates velocity modulation at the output cavity
 Discuss Question
Answer: Option A. -> Velocity modulation at the input cavity creates density modulation at the output cavity
Question 69. In a pulsed radar set, the function of the duplexer is to
  1.    Prevent frequency drift in the klystron
  2.    Allow the transmitter and the receiver to operate from a common antenna
  3.    Aid in calibrating the display unit
  4.    All of these
 Discuss Question
Answer: Option B. -> Allow the transmitter and the receiver to operate from a common antenna
Question 70. The main frequency determining element of a klystron is
  1.    Its mode of operation
  2.    The repeller voltage
  3.    Its resonant cavity
  4.    The accelerating voltage
 Discuss Question
Answer: Option C. -> Its resonant cavity

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