ATSEP BASIC - QUIZZ UPDATED ACTUAL EXAM WITH CORRECT SOLUTIONS

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ATSEP BASIC - QUIZZ 2025-2026
UPDATED ACTUAL EXAM WITH CORRECT
SOLUTIONS.


What type of surveillance is regarded Non-cooperative,
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independent surveillance? - correct answer- PSR radar
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What surveillance technique is ADS-B? - correct answer-
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Cooperative, dependent surveillance
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What is an example of Cooperative, Independent surveillance?
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- correct answer- SSR radar
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How is an aircraft detected by the PSR? - correct answer- By
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reflected electromagnetic energy transmitted from the radar
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What is radar clutter on an ATM radar? - correct answer-
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Unwanted targets
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What is a limitation to the PSR radar? - correct answer- No
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identification of received echoes
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What is meant by PRI? - correct answer- Pulse repetition
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interval
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What is the purpose of the duplexer? - correct answer- To
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alternately switch the antenna between receiving and
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transmitting
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What is the operating principle of the aircraft transponder? -
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correct answer- To code a reply on the 1090MHz frequency in
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response to a SSR radar interrogation
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What is transmitted on a Mode C reply from a transponder? -
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correct answer- Pressure altitude
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What is it called when replies from 2 aircraft overlap causing
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errors in extracting the included data? - correct answer-
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Garbling
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What is a disadvantage of the classical SSR radar? - correct
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answer- Garbling can occur if 2 aircraft are close in slant range
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and on the same bearing
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What is a feature of Mode S? - correct answer- Selective
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interrogations to reduce FRUIT
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What is provided with Mode S enhanced surveillance? - correct
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answer- Downlinked aircraft parameters
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What is a feature of the Monopulse SSR radar? - correct
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answer- Improved azimuth resolution and fewer pulses needed
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to determine position
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ADS (automatic dependent surveillance) is a surveillance
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technique for use by ATS in which: - correct answer- Aircraft
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automatically provide, via data link, data from on-board
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navigation systems
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What is a feature of ADS-B? - correct answer- High update rate
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and simple, omnidirectional receivers
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Which airborne equipment supports the 1090ES messages? -
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correct answer- The Mode S transponder
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