Opting to field, Assam rode on the exploits of its pace trio of skipper Abu Nechim Ahmed (3/37), Arup Das (4/34) and Pritam Das (3/49) to bundle out a listless Tripura for 136 in 55 overs.
Middle-order batsman Abhijit Dey was the lone bright spot for Tripura, scoring a fine 54 off 131 balls which was decorated with 10 hits to the fence.
At stumps, Assam were 85 for one in 32 overs in their first innings in reply to Tripura's dismal total.
Opener Pallav Kumar Das (19) was the lone wicket to fall for Assam, clean bowled by medium pacer Rana Dutta.
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Assam trail Tripura by 51 runs with nine wickets in hand.
Brief Scores:
Tripura 1st innings: 136 all out in 55 overs (Abhijit Dey 54; Arup Das 4/34, Abu Nechim Ahmed 3/37, Pritam Das 3/49).