DGCA Air Navigation: Gnss / Gps Questions
252 exam-style Gnss / Gps questions for the DGCA Air Navigation paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
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Q1
NAVSTAR/GPS operates in the band the receiver determines position by:
- A UHF, range position lines
- B UHF, secondary radar principles
- C SHF, secondary radar principles
- D SHF, range position lines
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Correct answer: A. UHF, range position lines
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Q2
The NAVSTAR/ GPS control segment comprises:
- A the space segment, the user segment and the ground segment
- B a ground segment and the INMARSAT geostationary satellites
- C a master control station, a back-up control station and five monitoring stations
- D a master control station, a back-up control station, five monitoring stations and the INMARSAT geostationary satellites
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Correct answer: C. a master control station, a back-up control station and five monitoring stations
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Q3
The orbital height and inclination of the NAVSTAR/GPS constellation are:
- A 20180 km, 65°
- B 20180 km, 55°
- C 19099 km, 65°
- D 19099 km, 55°
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Correct answer: B. 20180 km, 55°
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Q4
The model of the earth used for NAVSTAR/GPS is:
- A WGS90
- B PZ90
- C WGS84
- D PZ84
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Correct answer: C. WGS84
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Q5
The minimum number of satellites required for a 3D fix is:
- A 3
- B 4
- C 5
- D 6
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Correct answer: B. 4
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Q6
The NAVSTAR/GPS operational constellation comprises how many satellites
- A 12
- B 21
- C 24
- D 30
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Correct answer: C. 24
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Q7
The most accurate fixing information will be obtained from:
- A four satellites spaced 90° apart at 30° above the visual horizon
- B one satellite close to the horizon and 3 equally at 60° above the horizon
- C one satellite directly overhead and 3 equally spaced at 60° above the horizon
- D one satellite directly overhead and 3 spaced 120° apart close to the horizon
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Correct answer: D. one satellite directly overhead and 3 spaced 120° apart close to the horizon
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Q8
The most significant error of GNSS is:
- A GDOP
- B Receiver clock
- C Ionospheric propagation
- D Ephemeris
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Correct answer: C. Ionospheric propagation
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Q9
The frequency available to non-authorised users of NAVSTAR/GPS is:
- A 1227.6 MHz
- B 1575.42 MHz
- C 1602 MHz
- D 1246 MHz
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Correct answer: B. 1575.42 MHz
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Q10
The purpose of the pseudo-random noise codes in NAVSTAR/GPS is to:
- A identify the satellites
- B pass the almanac data
- C pass the navigation and system data
- D pass the ephemeris and time information
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Correct answer: A. identify the satellites
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Q11
The minimum number of satellites required for receiver autonomous integrity monitoring is
- A 3
- B 4
- C 5
- D 6
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Correct answer: C. 5
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Q12
If a receiver has to download the almanac, the time to do this will be:
- A 2.5 minutes
- B 12.5 minutes
- C 25 minutes
- D 15 minutes
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Correct answer: B. 12.5 minutes
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