Assuming asking for B.tech, In order to get admission in DTU you need to appear for JEE Main Entrance Exam, the counselling will be through JAC Delhi. 

As per the eligibility criteria you should have minimum 60% aggregate marks or more in Physics, Chemistry and Mathematics in 10+2. 

To check the complete detail about the eligibility you can go through with given below link.

JAC Delhi Eligibility

Good Luck!