11. A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.
12. Rainfall is an important factor for fading of radio waves at frequencies above
13. In a pulsed radar set, the STC circuit is used to
14. Which causes multipath or frequency selective fading?
15. If k-factor is greater than 1, the array beam is bent
16. Klystron oscillators are most often used in the frequency range of
17. 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?
18. The main frequency determining element of a klystron is
19. As the electron beam moves through a klystron’s intercavity drift space
20. In a pulsed radar set, the function of the duplexer is to
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