  We have determined the mass functions, mass-ratio distribution functions and
fractions of binary stars with mass ratios above particular thresholds for
radially-separated populations of stars in the nearby open clusters Hyades and
Praesepe. Radial mass segregation is detected, with the populations of stars
within the tidal radii having much flatter mass functions than those outside
the tidal radii. Within the tidal radii, the frequency of binary stars with
mass ratio q > 0.5 is 50 - 75 per cent higher for Hyades and 5 - 30 per cent
higher for Praesepe. We also, for the first time, detect mass-ratio radial
segregation. Of the binaries for which q > 0.5, ~ 80 per cent of the inner
Hyades population also have q > 0.75, while for the extra-tidal population, the
ratio is ~ 50 per cent. For Praesepe, ~ 67 per cent of the inner sample have q
> 0.75, and 35 - 45 per cent of the outer sample
