Following an impressive 3-1 victory over Watford on Tuesday, goals from David Clarkson and Nicky Maynard sealed a deserved success for the Robins.
In a tepid encounter, the hosts took the lead in the 13th minute when Clarkson's inswinging cross found the back of the net.
Although City were able to control the tempo of the match, they failed to fashion many first-half chances.
However, Maynard struck after the interval to wrap up the points after converting from Martyn Woolford's corner.
Keith Millen's side moved 10 points clear of the npower Championship relegation zone, whilst Scunthorpe were left five points adrift of safety.
Source: PA
Source: PA