Final answer:
Sectional views are used quite often when drawing assemblies in engineering to show internal details that cannot be seen in regular views.
Step-by-step explanation:
Sectional views are used quite often when drawing assemblies in engineering. They allow engineers to show the internal details of an assembly that cannot be seen in a regular view. This is especially useful when there are complex components or when certain parts need to be highlighted for better understanding. Sectional views can also help identify any potential issues or interferences within the assembly.
For example, when drawing an engine assembly, a sectional view can be used to show the internal components such as pistons, valves, and crankshaft, which are otherwise hidden. This helps in visualizing the function and arrangement of the parts.
In conclusion, sectional views are widely used in engineering drawings to provide a better understanding of complex assemblies and to visualize internal details of components that cannot be seen in regular views.