Q. What type of polarization is used for ground waves?

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Q. Why can we not use sky waves for navigation?

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Q. Ground waves are not adversely affected by which of the following factors?

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Q. The propagation velocity is not constant in ground waves.

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Q. The effect of signal simultaneously taking different paths to reach the receiver is called as _______

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Q. ______ is the error in determining position relative to an earth referenced coordinate system?

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Q. The method in which the user’s receiver and the reference station are assumed not to be synchronized in time is called as _______

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Q. Which type of direction finders takes bearings on airborne transmitters and advice the aircraft of its bearing from the ground station?

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Q. Which of the following is not true with respect to airborne direction finder?

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Q. Which of the following type of direction finder has a system that rotates the loop, using a servo system until a null is found?

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Q. Which of the following is not true with respect to loop antennas?

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Q. What can be added to reduce signal ambiguity in a loop antenna?

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Q. What is used to combine the output of the two fixed loop antenna that are placed at right angles to each other?

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Q. The area of reduced signal strength in a non directional beacon is called as ______

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Q. Which of the following is not an advantage of NDB?

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Q. What frequency does the marker beacon use for fixes along the airways?

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Q. Which of the following can be used to reinforce the upward beam in a marker beacon?

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Q. What is the frequency of rotation of the directional beam in a VOR?

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Q. Which of the following generates the same field pattern as a vertical dipole antenna?

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Q. What is the time gap between each pulse in an interrogation pulse pair for a DME?

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