In speed control DC shunt generator experiment does the saturation in the machine play any role?

Yes, saturation in a DC shunt generator plays a significant role in speed control. When the magnetic core becomes saturated, the generator's ability to produce an increase in output voltage with increased field current diminishes. This results in a nonlinear relationship between the field current and output voltage, which can complicate the speed control process. Consequently, operating in the saturated region can lead to reduced efficiency and stability in maintaining the desired speed.