Question Paper 2015 Outside Delhi set 1 CBSE Class 12 ENGINEERING DRAWING

General Instructions:

Attempt all the questions.

Follow the SP: 46-2003 revised codes (with First Angle method of projection).

Missing and mismatching dimensions, if any, may be suitably assumed.

All dimensions are in millimetres.

<math>\blacktriangle</math> Use the given dimensions in figures

1. Answer the following Multiple-Choice Questions. Print the correct choice on your drawing sheet. [5]
2. Section area is shown by
3. Sketching (b) Colouring (c) Hatching/section linings (d) Dots
4. The end of the Stud which is screwed in the body of casting with threaded hole is called
5. Nut end (b) Metal end (c) Close end (d) Open end
6. In which of the following joints, a single line/row of rivets is used to join two plates together?
7. Zigzag joint (b) Single riveted lap joint (c) Double riveted lap joint (d) Multiple riveted joint
8. The portion of the shaft which rotates in the sleeve/bush of a bushed bearing is called as
9. Journal (b) Axle (c) Rod (d) Pipe
10. Protected flange coupling is better than the unprotected flange coupling with regard to
11. Protection from dirt (b) Protection from water (c) Protection from fire hazards
12. Ensure safety

1/8

Ans. (i) (c) or Hatching/section linings. (ii) (b) or Metal end. (iii) (b) or Single riveted lap joint.

1. (a) or Journal. (v) (d) or Ensure safety.

2. (i) Construct an isometric scale. [4]

1. Draw the isometric projection of a frustum of a hexagonal pyramid (top base edge

30 mm, bottom base edge 40 mm, height 60 mm), keeping its axis perpendicular to H.P. and two of its base sides parallel to V.P. Draw the axis and indicate the direction of viewing. Give all dimensions. [7]

1. A right circular cone (base diameter 50 mm, height 50 mm) is placed with its base

resting centrally on the top rectangular face of a horizontal triangular prism (side of triangle 40 mm, length of the prism 70 mm), keeping triangular faces of the prism parallel to V.P. Draw the isometric projection of the combination of solids. Show the axis of each solid and indicate the direction of viewing. Give all dimensions. [13]

Ans. (i) ISOMETRIC SCALE

1. Marking of divisions of 10 mm, including division of first part of mm on true length.
2. Projections from scale 1:1 to get points on isometric scale, construction of isometric scale.
3. Printing ‘True Length/Scale 1:1’, ‘Isometric Length/Isometric Scale’ and marking angles of <math>30^{\circ} \& 45^{\circ}</math>.
4. ISOMETRIC PROJECTION OF A FRUSTUM OF A HEXAGONAL PYRAMID
5. Drawing helping figure of both hexagons.
6. Drawing isometric hexagon, on top and at the base.
7. Drawing four slant edges.
8. Marking the vertical axis, direction of viewing.
9. Dimensions.

NOTE: For incorrect position, 1 mark should be deducted.

1. ISOMETRIC PROJECTION OF A CONE PLACED, CENTRALLY, ON A TRIANGULAR PRISM [13]

TRIANGULAR PRISM 7

1. Drawing helping figure. (ii) Drawing both isometric triangles. (iii) Drawing horizontal edges. (iv) Marking the horizontal axis. (v) Dimensions.

2/8