NIT Warangal - National Institute of Technology

You can opt NIT Warangal, because if you are not having interest in a particular branch, then it is better not to compromise on the college. Moreover, if you opt NIT Warangal, based on your 1st year performance, you will have a chance to slide to core branches.

Yes,
NIT Surathkal is better than the other two NITs. Actually, NIT Surathkal is in 2nd position in NITs across India.

No, that is not possible. You have to appear for JEE Mains once again next year to get your seat next year.

Regret to inform you that admission for this year in NIT, Warangal is over. But you can try for other NITs like MNIT, Jaipur.

I would like to inform you that for this year, the admission procedure is already over. You can apply for next year and make sure you perform well in GD and PI.
Also an important point for the next year's admission at NIT, Warangal is they will accept the score card which will be generated in September 2018 or after that.

For this year, the GD and PI are already conducted and 3 rounds of counselling is also done. I would also like to inform you that admission for the next year will consider MAT score card which will be generated from September 2018.

You can predict your chances of admission at NIT, Warangal by viewing the previous year's opening and closing rank of each department as per the different counselling rounds. Please note that every year, the cut-off criteria changes so don't expect it to be same for this year. The details of previous year's cut-off are present at the official website of NIT-Warangal.

Go for NIT-Warangal, placements are good for ECE students.

Yes, you can easily get a seat in mechanical in NIT, Warangal.
Congrats.

There are 50-50 chances, you may get or you may not get mechanical as last year, the closing rank was around 13k.
But you may get civil in NIT, Warangal, which is also a very good branch. But if you are only targeting mechanical, then it's better to have another option ready, because you are not sure of getting mechanical in NIT-W.
You also have a chance of sliding your branch in NIT-W, based on your first-year performance. My suggestion would be putting mechanical NIT-W as the first option and civil NIT-W as your second option.