**Anna University**

**B.E./B.Tech. DEGREE EXAMINATIONS, JANUARY 2010**

**Regulations 2008**

**First Semester**

**Common to all branches**

**GE2111 ENGINEERING GRAPHICS**

Time: Three Hours

Maximum: 100 Marks

**Answer ALL Questions**

**(5 x 20 = 100 Marks)**

1. (a) The focus of a conic is 50 mm from *t*he directrix. Draw th*e *locus o*f *a point ‘P’ moving in such a way that its distance from th*e *directrix is equal to its distance from *t *he focus. Name t*h*e curve. Draw a tangent to the curve at a point 60 mm from t*h*e directrix. (20)

OR

1. (b) Make free hand sketches of *t *he front, top a*n *d right side views of th*e *object shown below : (20)

2. (a) The projections of a line measures 80 mm *i *n t*h*e top view and 70 mm i*n *th*e *front view. The mid point o*f *the line i*s *45 mm in front *o*f VP a*n *d 35 mm above HP. One end is 10 mm in front *o*f VP an*d *nearer to it. The other end i*s *nearer to HP. Draw the projections o*f *th*e *line. Find t*h*e true length and true inclinations. (20)

OR

2. (b) Draw t*h*e projections of a circle *o*f 70 mm diameter resting on t*h*e H.P. on a point A of th*e *circumference. The plane is inclined to *t *he H.P. such that t*h*e top view of it is *a *n ellipse of minor axis 40 mm. The top view *o*f t*h*e diameter, through the point A i*s *making an angle *o*f 45*◦** *with t*h*e V.P. Determine the inclination o*f *th*e *plane with t*h*e H.P. (20)

3. (a) An equilateral triangular prism 20 mm side of base an*d *50 mm long rests with one of its shorter edges on HP such that *t *he rectangular face containing t*h *e edge on which the prism rests i*s *inclined at 30*◦** *to H.P. The shorter edge resting on HP is perpendicular to VP. (20)

OR

3. (b) Draw *t *he projections o*f *a hexagonal pyramid with side of th*e *base 30 mm an*d *axis 70 mm long, when it i*s *resting with one of th*e *base sides on HP such that th*e *triangular face containing that side i*s *perpendicular to HP and axis i*s *parallel to VP. (20)

4. (a) A vertical cylinder 40 mm diameter is cut by a vertical section plane making 30*◦** *to VP *i *n such a way that t*h*e true shape of th*e *section is a rectangle *o*f 25 mm a*n *d 60 mm sides. Draw the projections a*n *d true shape of *t *he section. (20)

OR

4. (b) A regular hexagonal pyramid side o*f *base 30 mm and height 60 mm i*s *resting vertically on its base on HP, such that two of its sides *o*f t*h*e base are perpendicular to VP. It i*s *cut by a plane inclined at 40*◦** *to HP an*d *perpendicular to VP. The cutting plane bisects t*h*e axis of th*e *pyramid. Obtain th*e *development o*f *the lateral surface o*f *th*e *truncated pyramid. (20)

5. (a) A cylinder o*f *50 mm diameter and 75 mm height stands with its base on H.P. It i*s *cut by a section plane inclined at 45*◦ *to H.P an*d *perpendicular to V.P, passing through a point on t*h*e axis 20 mm below the top end. Draw t*h*e isometric projection of *t *he truncated cylinder. (20)

OR

5. (b) Draw t*h*e perspective projection of a cube of 25 mm edge, lying on a face on *t *he ground plane, with an edge touching *t *he picture plane a*n *d all vertical faces equally inclined to the picture plane. The station point i*s *50 mm in front *o*f t*h *e picture plane, 35 mm above the ground plane a*n *d lies in a central plane which *i *s 10 mm to t*h *e left of th*e *center of *t *he cube. (20)