Option 3 : 3

NTPC Diploma Trainee 2020: Full Mock Test

12120

120 Questions
120 Marks
120 Mins

__Explanation:__

**Orthographic projection** is the representation most commonly used by engineers. Orthogonal views provide a means for describing the exact size and shape of an object.

Depending on the complexity of the part, three or more views are required.

Orthographic projection, a common method of representing three-dimensional objects, usually by three two-dimensional drawings in each of which the object is viewed along parallel lines that are perpendicular to the plane of the drawing.

- The front view reveals the two dimensions, namely the length and the height of an object.
- The top view reveals the length and the other dimension (i.e., the width of the object).
- The side view reveals the height/depth and the width of the object (i.e., the length of the object).
- Thus the orthographic view represents the projection of an object by three views.