QUESTION ANSWERS-PROJECTIONS    Q. ANS. Engineering Drawing-1      Q. ANS. Engineering Drawing-2       Q. ANS. Engineering Drawing-3           Q. ANS. Drawing Scales-1      MCQ Projections of points   Q. ANS. Projection Points        MCQ Projections Straight Line         Isometric Projections       Orthographic Projections           Q. ANS. Projections Line       Q. ANS. Projections        Q. ANS. Projection Planes         Projections of solids



Projections are important for

making a drawing. Commonly

used projections are orthographic

and isometric. All items are

manufactured from a drawing.

Q 1 What is a Horizontal Plane?

ANS-— A horizontal plane is parallel to leveled ground. It is denoted by H.P.. The top view (Plan) is drawn on it.

Q 2 What is a Vertical plane?

Ans The plane which is parallel to a vertical wall is vertical plane. It is denoted by V.P.. The front view (Elevation) is drawn on it.

Q 3– Name the principal planes of projections.

Ans:-Planes employed for projections of front view, top view and side view are principle planes of projections. These are referred as reference planes. These planes intersect at right angles to each other. These are vertical plane, horizontal plane and the profile plane. These are assumed to be transparent planes.

Q 4:- What is the principle of projection?

Ans:-Straight lines are drawn from various points on the contours of an object. These meet at points on the plane of projection. A shadow of the object is formed on joining these points. This shadow is called the projection of the object on that plane. The object is said to be projected on that plane.

Q 5 What are the different methods of projections?

Ans: There are four types of orthographic projections.

(i) First angle projection
(ii) Second angle projection
(iii) Third angle projection
(iv) Fourth angle projection

Q 6 What is orthographic projections?

Ans: The projections on planes perpendicular to each other are orthographic projections. Front view, top view and side view of an object are Orthographic projections.

Q 7 What are different types of projections?

Ans: There are two types of projections, namely, orthographic and isometric projections.

Q 8 What is a reference line or ground line (G.L.)?

Ans:-The line of intersection of two principle planes of projections VP and HP is reference or ground line. It is x-y line. All views are above or below the ground line. It depends upon the method of projection. In first angle projection, Front View is above the ground line.

Q 9 What is an auxiliary plane?

 An inclined plane is an Auxiliary plane.   Inclined plane to HP is

Auxiliary Inclined Plane (AIP). Inclined plane to VP is Auxiliary  Vertical Plane (AVP).

Q 10 What is an auxiliary view?

Ans:-The view obtained on the inclined plane is auxiliary view.  Section of solids uses it. Sectioning gives internal details which are not visible.