Many government bodies pay travelling allowance to candidates called for interviews.
It is usually limited to the shortest rail or bus route fare for the entitled class.
Some exams pay TA/DA only to SC/ST or PwD candidates — check the notification.
Keep your original travel tickets, as they may be required for the claim.
The allowance is claimed on a prescribed form submitted at the interview venue.
Written exams and PET/PST stages generally do not carry TA/DA.