Krishna (4/38) and Arup (3/49) ran through Delhi's batting line-up with a lethal bowling spell to bowl out the visitor's
in 59.4 overs and give Assam a slight upperhand.
Opting to bowl after winning the toss, Krishna gave a dream start to Assam by removing opener Unmukt Chand, LBW with the very first delivery of the match.
Milind Kumar (45) and wicket-keeper Puneet Bisht (23) then shared 63 runs for the fifth wicket to forge a fightback before the Assam bowlers again found their acts.
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Besides Milind and Puneet, Manan Sharma (46) and Pradeep Sangwan (12) were the other two Delhi batsmen to have reached double digit scores.
Pallav Kumar Das (1/13), Amit Verma (1/14) and Jamaluddin Syed Mohammad (1/18) were other wicket takers for Assam.
Skipper Gokul Sharma (22 not out) was at the crease along side KB Arun Karthik (19).
Sangwan (2/1) picked up the wickets of Rahul Hazarika (19) and Amit Verma, while Navdeep Saini dismissed Pallav Kumar Das.
Assam still trail Delhi by 80 runs in the first innings with seven wickets in hand.
Brief Scores:
Delhi: 149 all out in 59.4 overs (Manan Sharma 46 not out, Milind Kumar 45; Krishna Das 4/38, Arup Das 3/49).
Assam: 69 for three in 29 overs (Gokul Sharma 22 not out, KB Arun Kar thik 19 not out; Pradeep Sangwan 2/1).