CBSE Class-12 Question Papers for IOP/Comptt Examination 2017 : Engineering Science

ENGINEERING SCIENCE
(Common for Automobile Technology, Structure & Fabrication and
Air-Conditioning & Refrigeration)
(Theory) Paper – I

Time allowed : 3 hours

Maximum Marks : 70

.

Instruction : Answer all the questions.

Part – I 
Engineering Drawing

1.A regular hexagonal prism of base side 30 mm and axis 76 mm long, is resting on its base on HP in such a way that one side of the base is parallel to VP. It is cut by a section plane, perpendicular to HP and inclined at 40° to VP and passing through the axis of the prism. Draw its sectional front view and top view.

2. A hexagonal prism, having base side 30 mm and height 72 mm, is resting on its base on HP in such a way that its one side is parallel to V.P. and near to observer. It is cut by a section plane, perpendicular to V.P. and inclined at 40° to H.P. and passes
through a point on the axis 30 mm above the base. Draw the development of the lateral surfaces of the truncated prism.

3 Sketch free hand the front view of any two of the following :
(i) Any riveted joint
(ii) Flanged coupling
(iii) Hexagonal nut and square headed bolt assembly
(iv) Any two types of keys

Part – II 
Workshop Technology

Instructions : Answer any three questions. All questions carry equal marks.

4.Describe gas welding process. For what type of work do we use gas welding ?

5. Explain TIG welding. Give its advantages.

6. Explain electroplating processes. Give their applications.

7. Compare thermoplastics and thermosetting plastics. Give applications of each.

8. Write short notes on any two of the following :
(i) Soldering
(ii) Galvanization
(iii) Metallic coatings
(iv) Use of primers

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Courtesy: CBSE