CBSE Class-12 Exam 2020 : Question Paper (Engineering Science)

• Subject :-Engineering Science
• Class : XII
• Year : 2020

PART – I

ENGINEERING DRAWING

 SECTION A

Answer any ten questions out of the given 12 questions of 1 mark each : 1x10=10

1. Which of the following is not a temporary fastener ?
(i) Riveted joint
(ii) Welded joint
(iii) Nut and Bolt

2. In a V-thread, which of the following is the angle between the flanks ?
(i) 450
(ii) 300
(iii) 600

3. Which of the following is not a type of thread ?
(i) BSF
(ii) BSW
(iii) Isometric

4. For square rods, which of the following joints is preferred ?
(i) Socket and Spigot joint
(ii) Gib and Cotter joint
(iii) Sleeve and Cotter joint

5. Lead in a multiple thread is obtained by multiplying pitch with number of threads. Is this correct ?

6. A protected coupling is enclosed in a cage so that it does not harm any one. Is this correct ?

7. Spring washer is a sort of locking device. Is this correct ?

8. Give any two types of sections of solids.

9. A circular plane is inclined to HP and is perpendicular to VP. Which of the following is the top view ?
(i) Ellipse
(ii) Circle
(iii) A line

10. A polyhedron having a plane base and triangular faces meeting at apex,is called as :
(i) Pyramid
(ii) Prism
(iii) Cone

11. The top portion of a cone is cut by a plane parallel to base. What is the remaining portion called from the following ?
(i) Frustrum
(ii) Ellipse
(iii) Circle

12. Which method is used for development of prism from the following ?
(i) Parallel line development
(ii) Radial line development
(iii) Appropriation development

SECTION B

Answer any five questions out of the given 7 questions of 3 marks each : 3x5=15

13. Name any three temporary fasteners.
14. Draw the profile of a buttress thread and give its angle.
15. Give examples of three types of bolts.
16. Name any three types of rivet heads.
17. Draw the sketch of a Gib Head key.
18. Give an example of a revolved section.
19. Draw the development of a triangular pyramid.

SECTION C

Answer any three questions out of the given 7 questions of 5 marks each : 5x3=15

20. A regular hexagonal prism, base 25 mm side, axis 70 mm long is resting on its base on HP having a side of the base parallel to VP. It is cut by a section plane inclined at 45 to HP, perpendicular to VP, and passing through a point on axis 30 mm above the base. Draw its sectional plan.

21. Draw the development of lateral surfaces of a square pyramid of 30 mm base and 50 mm height.

22. Draw a free hand plan and sectional elevation of a double-riveted lap-joint.

23. Draw a free hand sketch of any one type of foundation bolt.

24. Draw a free hand sketch of the eye end of a Knuckle joint.

25. Draw a free hand sketch of split muff coupling.

26. What is the function of a locknut ? Draw a sketch of any type of locknut.

Click Here To Download Full Paper

<< Go Back To Main Page

Courtesy: CBSE