There were 2 rounds of interview, 1st was tha technical and 2nd was the managerial round. Basic Oops and collection questions. I cleared first round and 2nd was also good but at the time of interview. After both the round I received a call from HR and she offered me only 10 % hike while we already discussed the expected salary but after clearing all the round she said we do not have budget... I don't know why HR conduct the interview when they already know that they don't have budget.

It was HR and TR round basically. Both are taken by different interviewers. You have to clear TR Round before sitting into the HR Round. But at the end i will sat it is only based on your basic knowledge that you learned in your course.