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Sem - I Jun 2008 Pattern Eng. Graphics - I

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Total No. of Questions : 12] [Total No. of Printed Pages : 7 [3761]-105 F. E. (Semester - I) Examination - 2010 ENGINEERING GRAPHICS - I (June 2008 Pattern) Time : 4 Hours] [Max. Marks : 100 Instructions : (1) Answers one question from each unit. Answer three questions from section - I and three questions from section - II. (2) Answers to the two sections should be drawn on separate drawing sheet. (3) Retain all construction lines. (4) Use of log table, electronic pocket calculator is allowed. (5) Figure in bracket indicate full marks. (6) Assume suitable data, if necessary. (7) Use only half imperial size drawing papers as answer sheets. SECTION - I UNIT - II : ENGINEERING CURVES Q.1) (A) Draw an ellipse with the major axis 160 mm and minor axis 120 mm. The portion on the left side of the minor axis is to be drawn by Concentric Circles Method and on the right side of minor axis by Rectangle Method. Draw tangent and normal to the ellipse at a point 70 mm distance from the center of ellipse. [08] (B) A car travels along a road inclined at 35o to the horizontal. Diameter of wheel of the car is 400 mm. Plot the path traced by a point on the circumference of the wheel, initially situated exactly at the point of contact of the wheel and the road. Name the curve. [07] OR [3761]-105 1 P.T.O. Q.2) (A) Draw an Archimedean spiral of 1.5 convolutions the greatest and least radii being 125 mm and 35 mm respectively. [07] (B) Rod AB, 90 mm long is rotating uniformly about B. During the time rod completes one revolution, point P starts from A and moves along rod uniformly to B and reaches back to point A. Draw the path traced out by point P. Give name of the curve. [08] UNIT - III : ORTHOGRAPHIC PROJECTIONS Q.3) For the object shown in fig. 1, draw the following views, using First Angle Method of Projection : (a) Sectional Elevation in the direction of arrow X (section along A-A) [07] (b) Plan [05] (c) End View from Right Hand Side [05] Give all dimensions. [03] 36 A 3 OIL HOLE 36 SIMILAR WED ON OTHER SIDE 28 18 10 10 82 20 2HOLES, 12 THROUGH 18 18 36 R1 8 10 R5 20 6 10 64 10 72 X R2 8 A 54 Fig. 1 [3761]-105 OR 2 Contd. Q.4) For the object shown in fig. 2, draw the following views, using First Angle Method of Projection : (a) Sectional Elevation looking in the direction of arrow X (Section along A-A) (b) Plan (c) End View from the Left Hand Side Give all dimensions. 74 4 A R2 30 10 90 2 10 0 HO 70 0 4 S 20 20 1 130 4 6 90 6 0 R2 20 R2 R1 0 22 2 LE 32 60 44 [07] [05] [05] [03] 0 Fig. 2 X UNIT - IV : AUXILIARY PROJECTIONS Q.5) (A) Fig. 3 shows front view, incomplete side view and partial auxiliary view of a machine element : (1) Redraw the given views [05] (2) Complete the Side View [08] Show all the dimensions. [02] 12 30 x 45 6 12 R30 10 50 FRONT VIEW [3761]-105 I I 6 0 X. V U .A NC 6 60 25 24 12 15 12 60 o INC. SIDE VIEW Fig. 3 EW OR 3 P.T.O. Q.6) Fig. 4 shows front view, incomplete top view and partial auxiliary view of an object : (a) Redraw the given views [05] (b) Complete the Top View [08] Show all dimensions. [02] 20 80 40 o 20 FRONT VIEW 24 SQ. 48 100 PART. AUXILIARY VIEW Fig. 4 INC. TOP VIEW SECTION - II UNIT - V : ISOMETRIC Q.7) Fig. 5 shows the elevation and end view of an object by First Angle Method of Projection. Draw an isometric view taking origin at O and give all dimensions : [17+3] 28 R30 R22 54 42 76 10 22 16 40 26 O 15 74 30 60 END-VIEW ELEVATION Fig. 5 OR [3761]-105 4 Contd. Q.8) Fig. 6 shows the elevation and plan of an object by First Angle Method of projection. Draw its isometric projection taking origin at O . Construct isometric scale to read 110 mm length. Give all dimensions. [15+2+3] 25 20 10 100 20 ELEVATION REGULAR HEXAGON R35 20 20 60 o O Fig. 6 12 75 TOP VIEW O UNIT - VI : MISSING VIEWS Q.9) Fig. 7 shows front view and left hand side view of an object. Draw the following views by First Angle Method of Projection : (a) Sectional Front View (Section along A-A) [07] (b) Top View [08] (c) Left Hand Side View [03] Give all dimensions. [02] 22 A 24 30 75 70 45 R24 M16 45 60 50 15 14 A F.V. Fig. 7 L.H.S.V. OR [3761]-105 5 P.T.O. Q.10) Fig. 8 shows front view and top view of an object. Draw the following views by First Angle Method of Projection : (a) Sectional Front View (Section along AA) [07] (b) Top View [03] (c) Right Hand Side View [08] Give all dimensions. [02] 60 15 10 6 10 10 16 R12 44 20 R15 66 10 30 16 10 18 16 F.V. A 18 A 55 43 Fig. 8 T.V. UNIT - VII : FREE HAND SKETCHES Q.11) Draw proportionate free hand sketches of the following : (a) Acme Thread Profile [03] (b) Oldham s Coupling [03] (c) Rag Foundation Bolt [04] OR [3761]-105 6 Contd. Q.12) Draw proportionate free hand sketches of the following : (a) Woodruff Key [03] (b) Cylindrical Helical Torsion Spring of Circular Cross-section Wire [03] (c) Double V-Butt and Single Bevel Butt Welded joints. [3761]-105/7 [04]

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