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S.Y. Diploma : Sem. III [AE/ME/MH/MI/PG/PT]

Mechanical Engineering Drawing Time: 4 Hrs.] Prelim Question Paper Solution [Marks : 100

Q.1(a) Draw conventional representation for any SIX of the following : (i) Concrete and insulating materials (ii) Splined shaft. (iii) Revolved sections. (iv) Knurling (v) Ball bearing. (vi) Spur gear. (vii) Rubber (viii) Helical compression spring of wire of rectangular cross-section.

[12]

(A) (i) Concrete and insulating materials i) Concrete Insulating material

(ii) Splined shaft.

(iii) Revolved sections.

(iv) Knurling Knurling (Straight) (Diamond) (any one type may be considered)

(v) Ball bearing.

Bearings

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Vidyalankar : S.Y. Diploma MED

34

(iv) Spur gear

(vii) Rubber

(viii) Helical compression spring of wire of rectangular cross-section.

Q.1(b) Attempt any TWO of the following : [8]Q.1(b) (i) State the meaning of the following symbol :

(1) (2)

(3) 21H6 (4) 21K5

[4]

(A) (1) Roughness grade (2) Concentricity or coaxially with datum plane/axis A (3) 21 = Basic size, H = Fundamental deviation, 6 = Tolerance grade (4) 21 = Basic size, K = Fundamental deviation, 5 = Tolerance grade Q.1(b) (ii) The shaft size is 350.04 and hole size is 350.00. Determine

type of fit between them. [4]

(A) Max allowance = upper limit of hole lower limit of shaft = 35.00 35.00 = 0.00 (equal) Min allowance = lower limit of hole upper limit of shaft = 35.00 35.04 = 0.04 ( ve) Interference fit

A

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Prelim Question Paper Solution

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Q.1(b) (iii) Draw the symbols for following features which are controlled in geometrical tolerancing.

(1) flatness (2) cylindricity (3) angularity (4) profile of any surface

[4]

(A) 1) Flatness

2) Cylindricity

3) Angularity 4) Profile of any surface Q.2(a) Figure shows incomplete FV and partial auxillary view of bracket.

Redraw the given views and complete front view, showing all details. [12]

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Vidyalankar : S.Y. Diploma MED

36

(A)

Q.2(b) Attempt any TWO of the following : [8]Q.2(b) (i) Two rectangular plates are to be welded with each other along

the length. The thickness and length of both the plates is12 mm and 60 mm respectively. The plates are to be ‘U’ buttwelded with convex counter. Prepare welding drawings.

[4]

(A) Welding Drawing

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Prelim Question Paper Solution

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Q.2(b) (ii) Giving symbols illustrate. (1) Convex fillet weld (2) Flat double v butt weld. (3) spot weld (4) Seam weld

[4]

(A) (1) convex filter weld (2) Flat double v butt weld. (3) Spot weld (4) Seam weld Q.2(c) (iii) State the meaning of the symbol shown in figure.

[4]

(A) Grinding = Manufacturing method 0.8 = Sampling Length 8 = Roughness Value in micron 2 = Machining Allowance = Direction of lays

Q.3 Attempt any TWO of the following : [20]Q.3(a) A vertical square prism, base 60 mm side is completely penetrated

by a horizontal square prism, base 40 mm side so that their axesare 25 mm apart. The axis of the horizontal prism is parallel toV.P., while faces of both prisms are equally inclined to V.P. Drawthe projections showing lines of intersection. Assume suitablelength of prisms.

[10]

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Vidyalankar : S.Y. Diploma MED

38

(A)

Q.3(b) A vertical cone, base 80 mm diameter and axis 100 mm long resting

on H.P. is penetrated by a horizontal cylinder of 50 mm diameter.The axis of cylinder is 30 mm above the base of cone and 10 mm infront of the axis of cone. Draw the projections showing curves of intersection. Assume suitable length of penetrating cylinder.

[10]

(A)

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Prelim Question Paper Solution

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Q.3(c) A vertical cylinder of 80 mm diameter and 100 mm length ispenetrated by another cylinder of same size. The axis ofpenetrating cylinder is parallel to H.P. and V.P. and 10 mm awayfrom the axis of vertical cylinder. Draw the projections showingcurves of intersection.

[10]

(A)

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nkar

Vidyalankar : S.Y. Diploma MED

40

Q.4 Attempt any ONE of the following : [20]Q.4(a) Figure show the details of lathe tool post. Draw sectional F.V.

and T.V. of the assembly. Also prepare bill of material.

[20]

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Prelim Question Paper Solution

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(A)

Assembly of lathe tool post coupling

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Vidyalankar : S.Y. Diploma MED

42

Q.4(b) Figure shows the details of foot step bearing. Draw the followingviews of assembly : (i) Sectional front view. (ii) Top view. (iii) Prepare bill of materials

[20]

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Prelim Question Paper Solution

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(A)

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Vidyalankar : S.Y. Diploma MED

44

Q.5 Attempt any ONE of the following : [20]Q.5(a) Figure shows orthographic views of plummer block: Draw the detail

drawing following parts. (i) Body Half sectional FV and TV (ii) Cap FV and TV (iii) Brasses FV and SV (iv) Indication of tolerances, geometrical tolerances, dimension, fits

etc.

[20]

28

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Prelim Question Paper Solution

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(A)

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Vidyalankar : S.Y. Diploma MED

46

Q.5(b) Figure 4 shows the half sectional front view and side view of anassembly of crosshead. Draw the part drawing of the components.

[20]

(A)

End View

PISTON ROD END

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