DGCA Air Navigation: Gnss / Gps Questions
252 exam-style Gnss / Gps questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
NAVSTAR/GPS operates in the band the receiver determines position by:
- AUHF, range position lines
- BUHF, secondary radar principles
- CSHF, secondary radar principles
- DSHF, 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:
- Athe space segment, the user segment and the ground segment
- Ba ground segment and the INMARSAT geostationary satellites
- Ca master control station, a back-up control station and five monitoring stations
- Da 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:
- A20180 km, 65°
- B20180 km, 55°
- C19099 km, 65°
- D19099 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:
- AWGS90
- BPZ90
- CWGS84
- DPZ84
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Correct answer: C. WGS84
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- Q5
The minimum number of satellites required for a 3D fix is:
- A3
- B4
- C5
- D6
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Correct answer: B. 4
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- Q6
The NAVSTAR/GPS operational constellation comprises how many satellites
- A12
- B21
- C24
- D30
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Correct answer: C. 24
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- Q7
The most accurate fixing information will be obtained from:
- Afour satellites spaced 90° apart at 30° above the visual horizon
- Bone satellite close to the horizon and 3 equally at 60° above the horizon
- Cone satellite directly overhead and 3 equally spaced at 60° above the horizon
- Done 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:
- AGDOP
- BReceiver clock
- CIonospheric propagation
- DEphemeris
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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:
- A1227.6 MHz
- B1575.42 MHz
- C1602 MHz
- D1246 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:
- Aidentify the satellites
- Bpass the almanac data
- Cpass the navigation and system data
- Dpass 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
- A3
- B4
- C5
- D6
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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:
- A2.5 minutes
- B12.5 minutes
- C25 minutes
- D15 minutes
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Correct answer: B. 12.5 minutes
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