I am doing m.sc instrumentation a d preparing for gate.Am i eligible for psu?

Dear Arnika,
The eligibility criteria of PSU is that Candidates must have passed graduation in engineering/technology or Masters degree in any relevant science subject. And theres no age limit.
And PSU recruitment is done through GATE examination.

For more information following link will be more beneficial to you
https://engineering.careers360.com/articles/psu-recruitment-through-gate

I hope this information helps you

All the best