CBSE Class 12 Question Paper 2026 Solution Engineering Graphics

FOR CBSE CLASS 12 EXAM PREPARATION

CBSE Class 12 2026
Question Paper
Solution · Engineering
Graphics
EXAM YEAR TYPE SUBJECT

CBSE Class 12 2026 Question Paper Solution Engineering Graphics

Notes · Sample Papers · Previous Year Papers · Mock Tests

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MARKING SCHEME
STRICTLY CONFIDENTIAL
FOR INTERNAL AND RESTRICTED USE ONLY
SENIOR SECONDARY CERTIFICATE EXAMINATION 2026 XIITH
SUBJECT NAME : ENGINEERING GRAPHICS(QP CODE 68)
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Set 4
MARKING SCHEME
ENGINEERING GRAPHICS

SECTION – A

Q. 1 to Q.14 14×1=14

1. (D) One plane drawings

2. (B) using co-ordinate method.

3. (A) Axonometric projection

4. (C) (ii) and (iv) only

5. (B) Profile plane

6. (A) 1-(ii), 2-(iv), 3-(i), 4-(iii)

7. (C) 1-(iii), 2-(i), 3-(iv), 4-(ii)

8. (B) 0.25 d

9. (D) an angle of 30O on the outer end face

10. (C) (ii) and (iv) only

11. (B) (As per image)

12. (D) True R

13. (A) any misalignment while fitting

14. (B) by Gib and cotter joint

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SECTION – B

Q. 15 to Q.18 4×1=4

15. (D) 8

16. (C) 106 mm
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19. a (D) Distance between two corresponding points on the adjacent threads.

20. (B) Rivet

21. (A) Metric thread

22. (C) Lead

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23. (a) BUSH-BEARING (ASSEMBLY):
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FRONT VIEW, RIGHT HALF IN SECTION
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(13)

agright half of the body (2), sole recess (1) and the left half
 Drawing the
of the body (2) with arc of Ø60 (1/2). 51/2
 Drawing two circles representing bush. 2
 Drawing oil hole in the body (1) and in the bush (1/2). 11/2
 Bolt hole in right half of the body with axis (11/2) and axis of bolt
hole in left half (1/2). 2
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 Hatching lines in the right half of the body (1) and right half of the
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Note: If rounds and fillets is not shown in the

a body then (1/2) marks should be deducted.

68 5 P.T.O.

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(ii) TOP VIEW (8)

 Drawing outline of the body with two visible 60 mm vertical lines. 2
 Four hidden vertical lines representing the bush. 2
 Hidden lines rectangle for sole recess. 1
 Two circles representing the oil hole. 1
 Two elongated bolt holes (1) with axis lines (1/2). 11/2
 Cutting plane. 1/2

Details: (6)

 Printing the title 1
 Scale used 1
 Projection Symbol 1
 Six important dimensions 3

OR
23. (b) GIB AND COTTER JOINT (DIS-ASSEMBLY):

(i) STRAP

(a) FRONT VIEW LOWER HALF IN SECTION (8)

 Drawing the boundary of the strap (4) with rounds and fillets ( 1/2)
and conventional end (1/2) 5
 Drawing a slot of Gib and cotter in lower half (11/2), 40+3 mm, with
clearance (1/2) 2
 Drawing hatching lines in lower half 1

(b) TOP VIEW (6)

 Drawing boundary of the strap (11/2) with conventional end (1/2). 2
 Drawing slot of Gib and Cotter with clearance. 2
 Two Vertical lines (one visible and one hidden). 2

68 6

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(ii) GIB

(a) FRONT VIEW (4)

 Drawing the boundary of gib (21/2) including taper line (1) with
rounds of R5 (1/2). 4

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Details: (6)

 Printing the titles of both the parts. 1
 Scale used. 1
 Projection Symbol. 1

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 Six important dimensions. 3

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SECTION – C
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24. (a) ISOMETRIC SCALE: (4)

(i) Drawing lines at an angle of 30O and 45O. 1
(ii) Marking of divisions of 10mm, including divisions of first part of one mm
on true length. 1
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(iii) Projections from true length / scale 1:1 to get points on isometric length,
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68 7 P.T.O.

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24. (b) ISOMETRIC PROJECTION OF AN UPRIGHT CONE: (9)

(i) Drawing the isometric ellipse (31/2), with centre lines (1/2). 4
(ii) Drawing both the generators. 3
(iii) Marking the axis (1/2) and direction of viewing (1/2). 1
(iv) Dimensions. 1

Note: For incorrect position, (1) mark should be deducted.

25. (a) KNUCKLE THREAD PROFILE: (8)

(i) Marking of horizontal distances equal to half of pitch and one horizontal
centre line to create centre points of arcs. 2
(ii) Drawing semi-circular arcs of radius 0.25P, showing crests and roots of
threads (minimum two). 3
(iii) Drawing hatching lines with conventional break. 1
(iv) Standard dimensions. 2

Note: If sketched freehand, instead of drawing to scale 1:1, two (2) marks should
be deducted, in all.

OR
25. (b) HEXAGONAL NUT WITH VERTICAL AXIS: (8)

(i) Front view (Across Corner or Across Flat) drawn correctly. 3
(ii) Top view drawn correctly. 3
(iii) Standard dimensions. 2

Note: 1. For incorrect position, (1) mark should be deducted.
2. If sketched freehand, instead of drawing to scale 1:1, two (2) marks
should be deducted, in all.

68 8

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OIL HOLE Ø10 TILL 3, THEN Ø5
(a)
Ø40
Ø60

Ø30

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(ii) TOP VIEW
SCALE - 1:1

ASSEMBLY OF BUSH BEARING
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23 (i) STRAP
(b)

12

SQ 30
30

22
12

25 43 38

(a) FRONT VIEW, LOWER HALF IN SECTION

SQ 30
10

(b) TOP VIEW
(ii) GIB
12

TAPER 1 IN 30
54

15

12
12

SCALE - 1:1
(a) FRONT VIEW
NOTE: ALL FILLETS & ROUNDS ARE OF R5
10

(b) TOP VIEW

DISASSEMBLY OF GIB AND COTTER JOINT

68 10
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68 11 P.T.O.
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P
25 0.5P
R=0.25P
(a)

d = 0.5P
R=0.25P

P d=0.5P R=0.25P
50 25 12.5
KNUCKLE THREAD
OR

25 SOLUTION-1 SOLUTION-2
(b) R=d R

60°
30°
d

60° d

FRONT VIEW FRONT VIEW
Ø0.8d
1.5d+3

Ø0.8d Ød Ød

1.5d+3

TOP VIEW TOP VIEW
HEXAGONAL NUT (A/F) HEXAGONAL NUT (A/C)

d 0.8d 1.5d+3
25 20 40.5

68 12
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