CBSE Question Paper 2018 Class 12 Engineering Graphics

Time allowed: 3 hours

Maximum Marks: 70

General Instructions:

1. Attempt all the questions.

Use both sides of the drawing sheet, if necessary.

1. All dimensions are in millimetres.
2. Missing and mismatching dimensions, if any, may be suitably assumed.
3. Follow the SP 46: 2003 revised codes (with first angle method of projection).
4. In question 2, no views of hidden edges or lines are required.

In question 4, hidden edges or lines are to be shown in views without section.

1. Give your answers according to questions.

1. Answer the following Multiple Choice Questions. Print the correct choice on your drawing sheet. (1 <math>\times</math> 5 = 5)

1. The truncated lower portion of a pyramid is called
2. Prism
3. Frustum
4. Cube
5. Cone Ans. (b) Frustum.

1. In a single riveted lap joint, the plates to be joined are
2. In contact with each other at the ends
3. Overlapping each other
4. Inclined to each other
5. Kept at a distance of 10 mm from each other Ans. (b) Overlapping each other.

1. Which special type of Sunk key looks like a segment of a circular disc?
2. Woodruff key

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1. Feather key
2. Gib head key
3. Rectangular taper key Ans. (a) Woodruff key

1. Which of the following is not a part of an unprotected flange coupling?
2. Gasket
3. Shaft
4. Sunk key
5. Flange Ans. (a) Gasket

1. What is the purpose of crowning on the rim of a solid cast iron pulley?
2. To make the belt slip off the rim
3. To join the shaft with the rim
4. To lubricate the rim
5. To keep the belt in the middle of the rim Ans. (d) To keep the belt in the middle of the rim.

1. i. Construct an isometric scale. (4)

1. A vertical triangular pyramid (base edge 40 mm and axial height 60 mm) is resting on its base on H.P. One of its base edges is perpendicular to V.P. Draw its isometric projection. Show the axis and indicate the direction of viewing. Give all dimensions. (7)

1. A sphere (diameter 50 mm) is placed centrally on the top hexagonal face of a hexagonal prism (base edge 30 mm and height 40 mm). Two base edges of the prism are parallel to V.P. The common axis is perpendicular to H.P. Draw the isometric projection of the combination of solids. Show the common axis and indicate the direction of viewing. Give all dimensions. (13)

Ans.

1. Isometric Scale

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