Civil Engineering Drawing Multiple Choice Questions on “Orthographic Reading”.
1. In which of the following projection depth is not shown?
a) Oblique projection
b) Isometric projection
c) Perspective projection
d) Orthographic projection
Answer: d
Clarification: In the above starting 3 methods, these represents the object by a pictorial view as eyes see it. In these methods of projection a 3-d object is represented on a projection plane by one view only. While in the orthographic projection an object is represented by 2 or 3 views on the mutual perpendicular projection plane. Each projection view represents 2-D of an object.
2. When the projectors are parallel to each other and also perpendicular to the plane, the projection is called ___________ projection.
a) Oblique projection
b) Orthographic projection
c) Isometric projection
d) Perspective projection
3. The plane upon which the top view is projected is known as ________
a) Horizontal
b) Frontal
c) Profile
d) Base
7. The ____________ is the plane upon which the side view is projected.
a) Horizontal plane
b) Profile plane
c) Vertical plane
d) Inclined plane
Answer: b
Clarification: A third plane perpendicular to both coordinate planes, and hence to the ground line, is called a profile plane. This plane is vertical in position, and may be used as a plane of projection. A projection on the profile plane is called a profile view, or end view, or sometimes edge view, and is often required in machine or other drawing when the plan and elevation do not sufficiently give the shape and dimensions.
8. If 2nd plane shifts to the left of the object and 3rd plane shifts to the bottom of the object, then which angle of projection it will show?
a) Third – angle projection
b) Second – angle projection
c) First – angle projection
d) Fourth – angle projection
Answer: c
Clarification: When the object is situated in front of the V.P. and the H.P. i.e. in the first quadrant and then projected on these planes is called 1st angle projection. The object lies between the observer and the plane of projection. In this the top view comes below the front view.
9. What does the red area formed on the plane represents?
a) Extrusion
b) Shadow
c) Reflection
d) Projection
Answer: d
Clarification: It represents projection on the intersected plane of an object. The rays of sight are extended further to meet perpendicularly a vertical plane or horizontal plane thus forming the red area (in th fig.) on the planes.
10. An advantage of this type of view is that each view shows the object all the way through as if it were transparent?
a) Planar
b) Horizontal
c) Auxiliary
d) Orthographic
Answer: d
Clarification: In orthographic projection, the plane of projection is transparent as the plane of projection is in between observer and object.
11. Any object can be viewed from_________ mutually perpendicular views.
a) Two
b) Four
c) Three
d) Six
Answer: d
Clarification: The front, top, and right-side views are commonly considered the core group of views included by default, but any combination of views may be used depending on the needs of the particular design, these are – front, back, top, bottom, right side, left side views.