Avionics Fundamentals - ADF
Ten questions based on the FSS Web-X presentation, Introduction to Avionics Fundamentals 3 - Automatic Direction Finder
- 1.
The ADF requires two seperate antenna?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The aircraft consist of two antennas. The two antennas are called LOOP antenna and SENSE antennaRate this question:
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- 2.
A cardioid pattern is obtained from the sense antenna?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A cardioid pattern is not obtained from the sense antenna. A cardioid pattern refers to a specific directional pattern of radiation or reception, typically resembling a heart shape. It is commonly achieved with microphones or antennas that have specific design elements to focus or reject signals from certain directions. However, the sense antenna does not have the necessary characteristics to produce a cardioid pattern. Therefore, the correct answer is False.Rate this question:
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- 3.
The sense antenna has an Omni-directional pattern?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The sense antenna has an omni-directional pattern, meaning that it can receive signals from all directions equally. This allows it to detect signals from any direction without the need for pointing or adjusting the antenna.Rate this question:
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- 4.
The ADF indicator shows the relative bearing to the station?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Displays the bearing to station relative to the nose of the aircraftRate this question:
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- 5.
The ADF system frequency band is from 250-1250Khz?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
ADF is the radio signals in the low to medium frequency band of 190 to 1750 KhzRate this question:
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- 6.
The ADF system is a VHF Navigation system?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
They receive radio signals in the medium frequency band.Rate this question:
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- 7.
The ADF can have audio Morse Code ident?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
An NDB station is capable of transmitting a 2 or 3 letter Morse code identifier.Rate this question:
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- 8.
Name one source of ADF error.
- A.
Precession Error
- B.
Reflection Error
- C.
Shore Effect
- D.
Field Effect
Correct Answer
C. Shore EffectExplanation
Ground waves are refracted when passing across coast lines at low angles and this will affect the indicated bearing for an aircraft tracking to seaward and following the shore line.Rate this question:
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- 9.
The ADF signals induced to the antenna(s) are phase shifted by 90deg.?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The ADF signals induced to the antenna(s) being phase shifted by 90 degrees means that the signals are shifted in their timing or position by a quarter of a complete cycle. This phase shift is a characteristic feature of ADF systems and is necessary for accurate direction finding. By having the signals phase shifted, the ADF system can determine the direction of the signal source relative to the aircraft. Therefore, the statement is true.Rate this question:
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- 10.
The Pilot can actually listen to and steer by an ADF signal?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A useful ADF application is to locate a particular NDB and then track – or home – directly to it. The ADF receiver is tuned to the NDB frequency, and the audio volume turned up, so that the NDB can be identified as soon as the aircraft comes within range. The ADF needle indicates the bearing to the NDB and the wind correction angle necessary to maintain that track.Rate this question:
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Mar 22, 2023Quiz Edited by
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Apr 05, 2011Quiz Created by
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