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Which mode is used for selective calling?

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Which mode is used for selective calling?

(a) Mode A

(b) Mode B

(c) Mode C

(d) Mode S

I have been asked this question during an online interview.

My query is from Modes S System topic in section Surveillance Systems, Mapping and Multimode Radars of Avionics

1 Answer

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Best answer
The correct option is (d) Mode S

Best explanation: Different modes have its own unique features; mode A gives only identity, mode c gives identity and altitude, mode B is used in European operations and mode S is used for selective calling of transponders.

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