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Which mode of the secondary radar gives only altitude?

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Which mode of the secondary radar gives only altitude?

(a) Mode A

(b) Mode B

(c) Mode C

(d) Mode S

I got this question at a job interview.

Origin of the question is Primary and Secondary Radar in division Surveillance Systems, Mapping and Multimode Radars of Avionics

1 Answer

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Best answer
The correct choice is (a) Mode A

The explanation: There are two types of interrogations in the ATCRBS: mode A and mode C. Mode A provides identity only and mode C provides identity and altitude of the aircraft.

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