Dipanshu, 

If you are from delhi region then only you can take advantage of defense quota otherwise not. 

Closing ranks for last year defence quota in AIR was

Computer Science and Applied Mathematics 83354 (Priority VI)

 Computer Science and Biosciences 164060 (Priority VI)

 Computer Science and Design 106225 (Priority VI)

Computer Science and Engineering 88523 (Priority VI)

 Computer Science and Social Sciences 106369 (Priority VI)

 Electronics and Communication Engineering 124060 (Priority VI)

If you are from other state you won't get help from Defence quota. And you can't get admission In IIITD OR DTU at your rank. 

Hope it helps