Does the ATC normally ask you for transponder signals before landing, especially for emergency landing?
As I have said in a previous reply the transponder ,in normal circumstances ,remains ON throughout the flight.ATC do not NORMALLY ask anything about squawks(Transponder codes) before landing.
It is possible to use the transponder to ask the pilot questions eg "do you read this transmission,,,if so squawk ident" The questions are, by the nature of the replies likely to be recieved ,generally answered by YES or NO. It is used in a situstion such as a transmitter failure.