No, there is no ragging happening at NIT Jamshedpur. I have one of my cousins study at NIT Jamshedpur. I can tell you the ragging scenario there.
Seniors of NIT Jamshedpur are very helpful. But you must not misbehave with your seniors. They only visit freshers class when there is some important information to convey.
As a fresher, you may face a little difficulty while sports meet. You have to be in the parade group if you are not participating in games seriously. It turns out to be tough for students who cannot get up early in the cold morning. Seniors will call you for exercising on a cold morning. However, sports practice should not skip as they are as important as your academics.
You can have fun with seniors without getting rude. It is okay to have fun with them.
Therefore, you can join NIT Jamshedpur without any worries as no ragging has taken place till now.