AnonymousDear Mr. Atul kumar,
You attended interview at company X & Y, then joined X. Thereafter, got selected in Y. Without informing the fact to X, sent resignation letter to X and joined Y. Also, you did not tell Y that you were employed with X. Frankly speaking you have made a series of blunders. In fact, you were not required to obtain NOC for resigning and joining Y, because at the time of interview you were not employed, from the statement given above. If you were keen to join Y, you should have resigned telling the truth of your new employment, and there was nothing to stop you from joining Y. Only thing is that, you should have served the notice period or pay notice pay in lieu of the same. Since, both companies were PSUs, you would have an option for transfer of bond to the new company (I am telling this from personal experience too). Now, your queries:
(1) If by any means Y came to know about my previous employment with X, can any disciplinary action against me will be initiated??
Yes. They can. For suppression of information while joining the company, dishonesty etc.
(2) Could I submit NoC of X after few months?
I don't think X can issue an NOC at this stage, after your resignation (also in a situation of not resigning properly). NOC is given for attending test/interview or permission to apply, while in service, and you need to apply with proper documents. This was not applicable to you when you were with X, since you already had given interview at Y (before joining X). is it possible now to get NOC?
(3)What will happen if I will submit NoC after any action against me???
Same as above for NOC. Once the action is initiated, there is no point in the same.
(4)Does 'Y' can start enquiry on anonymous complaint.
Yes, they can. But whether to take action or not can be decided by Y. and only Y can save you from drastic action due to your ignorance of rules etc. (though it is not a legally valid ground). Also, note that X can also take action, if they want, on their own or write to Y to take action against you, since you are on double employment technically as you are not relieved from X.
From India, Bangalore