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Seat No.: Enrolment No.:
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER • EXAMINATION SUMMER 2017
Subject Code: 320008 Date: 15-06 -2017
Subject Name: Mechanical Drafting
Time: 10:30 AM TO 01:30 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Each question carry equal marks (14 marks)
Q.1

A regular hexagonal Pyramid, side of base 35 mm and height 70 mm is resting on one of its triangular face on the HP and the edge of the base contain that triangular face make an angle of 30º with VP, draw its projection.
07


35 mm 70 mm HP VP
07

A cylinder of 60 mm diameter and axis 80 mm is standing on its base on the HP . It is cut by a section plane which make an angle of 45º to HP and passing through a point on its axis 25 mm below the top base. Draw the Front view, sectional top view and true shape of section.


60 mm 80 mm HP 45º 25 mm

Q.2

Figure-1 show the pictorial drawing of an object. Draw the following views
Front View Top View Left Hand side view
07



07

A square prism 45 mm side is intersected by another horizontal square prism of 25 mm side. The axis of horizontal square prism is 8 mm away from the axis of the vertical prism. The rectangular faces of both prism are equally inclined to VP. Draw the line of intersection.


45 mm 25 mm 8 mm VP

OR
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A vertical Cone Diameter of base 75 mm and axis 110 mm long is resting on the HP on its base. A cylinder of 40 mm diameter, intersects the axis of the cone at right angle and 27 mm above the base. The axis of cylinder is parallel to both HP and VP. Draw the projections with showing the line of intersection.
07

75mm 110 mm 40 mm 27mm
Q.3

A hexagonal Pyramid edge of base 30 mm and height 50 mm is resting on a corner of its base on the HP such way that slant edge containing that corner makes angle of 60º with the HP and 30º with VP. Draw its projections.
07


30mm 50 mm HP 60º VP 30 º
07

Draw the development of lateral surface for given figure-2




OR
Q.3

A cone 50 mm diameter and its axis 60 mm long resting on HP on its base. A vertical cutting plane inclined at 60º to the VP and perpendicular to HP cuts this cone 7 mm away from its axis. Draw sectional front view, and true shape of the section.
07


50 mm 60mm VP 60º 7 mm
07

Draw the development of lateral surface for given figure-3




Q.4

Figure show the detail drawing of the tool post. Draw the assembly drawing showing elevation and plan of assembly of tool post. Give the necessary dimension and prepare parts list.
07



07

Explain the following AUTO CAD commands with statement and their use.
Line Circle Grid off set Trim Hatch Array




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OR
Q.4

Write the AUTO CAD program to draw the sketch as shown in figure-5
07



07

Figure show the assembly drawing of the cotter joint with sleeve. Draw the detail drawing of the parts of cotter joint with dimension. Draw the two view of every parts.


.

Q.5

Sketch the following symbol Plug weld Vacuum line Check Valve Flanged Glob Valve Double butt U weld Reducing Flange. Elbow-90º
07


90º
07

Draw the surface roughness symbol for the following detail
Roughness value 6.3 micron
Production method Grinding
Sampling length 60 mm
Machining allowance 2 mm
Type of lay Circular



mm mm


OR
Q.5

Draw the symbol of the following Seam Weld Double V Butt weld Safety Valve Reducer Gate Valve Coupling Union
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07

Define following terms Any Four) Interchangeability Deviation Zero line Transition fit Tolerance
Hole Base System Bilateral System of tolerance




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