Sectional Orthographic Views: problem 4 draw sectional F.V., top view, L.H.S.V...Prof. Sudhir Thakre 

Sectional Orthographic Views: Draw sectional Front View, Top View, Left Hand Side View
Sectional views are used in technical drawing to expose internal surfaces. They serve to present additional orthographic views of surfaces that appear as hidden lines in the standard front, top, and side orthographic views.
6 Types of sectional views
Full sections.
Half sections or views.
Offset sections or views.
Broken out sections or broken views.
Revolving sections or view.
Removed sections.