True azimuth is characterized by the same direction along the path of the journey. Quadrilaterals bounded by two parallels have the same area at different longitudes. None of the above. All projections cause some geometric distortions to the objects that are being projected. Reference globe is a scaled-down representation of earth that is subsequently used for creating projections.
Scale factor is a ratio of actual and principal scales.
All of the above. It is a good practice to use various projections in one atlas, so the viewer can easier compare different maps. Conformal projection maintains correctly the relative sizes of projected areas. Azimuthal projections use conic-shape projection surfaces. Apart from the methodological considerations, the page size and layout of the final publication may affect the choice of projections used.