Engineering Graphics
UNIT 4ORTHOGRAPHIC PROJETION1. Define orthographic projection. Describe briefly the method of obtaining an orthographic projection of an object. 2. Write short notes on:Reference planes; Reference line; Projector; Front view; Ground line. 3. Explain briefly how the reference line represents both the principal planes ofprojection. 4. Explain clearly the difference between the first-angle projection method and thethird-angle projection method. 5. What dimensions of an object are given by(i) Front view or elevation?(ii) Plan or top view?(iii) Left-hand side view and right-hand side view? 6. Figure show the orthographic projections of the objects in thefirst-angle projection method.Draw them in the third-angle projection method.a.
Q. The pictorial view of different types of objects are shown in following fig. Sketch,looking from arrow, elevation, plan and end-view using first-angle projectionmethod.7. 8. 9.
10. Figure shows the orthographic projections of the objects in thethird-angle projection method.Redraw them in the first-angle projection method.
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