  The amplitudes of the transition gamma* N -> P11(1440) are calculated within
light-front relativistic quark model assuming that the P11(1440) is the first
radial excitation of the 3q ground state. The results are presented along with
the predictions obtained in other relativistic quark models. In comparison with
the previous calculations, we have extended the range of Q^2 up to 4.5 GeV^2 to
cover the kinematic interval of the forthcoming experimental data. Using
approach based on PCAC, we have checked the relative sign between quark model
predictions for the N and P11(1440) contributions to the pion electroproduction
found in previous investigations.
