Studies on (d,d);(3He,3He); (d,3He);(3He,d) and (d,n) reactions are reported in this work. The (d,d) angular distributions were measured at an incident energy of 12.0 MeV on 45Sc, 40Ca and at 13.0 MeV on 37Cl, 35Cl, 27A1 and 23Na. The (3He,3He) angular distributions were measured at an incident energy of 14.0 MeV on 29Si and 25Mg. The results of elastic scattering studies were analysed to extract optical potential parameters for the analysis of the transfer reaction experiments. The (d,3He) angular distributions were measured on targets 45Sc, 40Ca at an incident energy of 12.0 MeV and on 37Ck, 35Cl, 27Al and 23Na at 13.0 MeV. The (3He,d) angular distributions were measured on targets of 29Si and 25Mg at an incident energy of 14.0 MeV. The reaction 29Si(d,n)30P was studied at 3.0 MeV. The results of transfer reaction studies were analysed using DWBA and Hauser-Feshbach theories and discussed in the light of the structure of the nuclear states involved. It has been possible in some cases to assign spins and parities to nuclear levels from these studies. Implications of reaction mechanism in some cases have also been considered. The problem of absolute normalization of DWBA calculations has been investigated using the results from some (d, 3He) studies.