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Solved Numericals of Engineering Drawing – ED 22 Solved Questions

December 26, 2020 by imBooz Leave a Comment

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Q20: A cone of base diameter 50 mm and axis 60 mm is resting on its base on the H.P. A section plane perpendicular to V.P. and inclined at 450 to H.P., bisects the axis of the cone. Draw the development of its lateral surface.

Solution:

Steps :

(i)  Here generators  o ‘2’, o ‘3’, o ‘4’, o ‘6’, o ‘7 ‘  and  o ‘8’  are not of the true length. Therefore, intersection points on these generators need to be projected on the generator o‘1’ which is of true length. Point b ‘, c ‘, d ‘ ……e ‘ are thus projected as b “, c “, d “….. on generator o ‘1’.

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  • The angle subtended by an arc at the center is given as, rs  3600 .
  • Where, s   slant height of cone = 65 mm  o ‘1’ , r  radius of base = 25 mm,Theta = 25/ 65  X 360=  138.50
    • Mark point O and draw an arc of circle of radius = o‘1’ with angle 50 . Divide the arc 1o1 into 8 equal parts.
      • Mark point A on O1 such that OA o ‘ a ‘ and point B on O2 such that OB O ‘ b “. Similarly, mark point C , D , E , F , G and H on O 3, O 4, O 5, O 6, O7 and O8
    •  Draw smooth curve passing through points A, B, C, D….. etc.

     

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Filed Under: Engineering Drawing Tagged With: Basic Engineering Drawing Questions, Draw projections of A square plate ABCD, Draw projections of pentagonal pyramid, Draw the development of the lateral surface of the left remaining portion of A cone, Draw the isometric view of a circular lamina, Draw the projections - inclinations - mark traces, Draw the projections of the complete tripod stand, Draw top view, isometric view, RGPV ED Solved Questions, sectional front view and true shape of the section of A hexagonal prism

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