Yep. When nurbs get rendered, they're automatically converted to polygons, so you have to increase the tessellation so that when it is converted, it's a whole lot of polygons in order to maintain the smooth look.
SimplyMaya specialises in Maya tutorials. We offer over 1,000 individual Maya training videos, ranging from basic Maya tutorials through to intermediate Maya tutorials. Our tutorials are created by instructors with industry experience and are designed to get you up and running in Maya quickly without making it seem like hard work.