**BE (1st Semester)**

**Examination Nov-Dec 2007**

**Engineering Graphics
**

Q1 (a) What is representative fraction?

(b) The representative fraction of a scale showing miles, furlongs and chains is 1 / 50688 Draw a scale to read to read up to 5 lines and show on it the length representing 3 miles 5 furlongs 3 chains

or

An area of 144 square centimeter on a map represents an are; 36 square km on the field. Find the representative fraction c the scale of this map to measure up to 10 kilometers Indicators on this scale a distance of 7 kilo meters, 5 hectometers and 61 decameters.

Solve any one

(c) A circle; of 50 mm diameter rolls on the circumference of another circle of 175 mm diameter outside, it. Trace the locus of a point on the circumference of rolling circle for one compete revaluation. Draw tangent and a normal to the at a point 125 mm from the centre of directing circle.

(d) Inseribe an ellipse in a parallelogram having sides mm and 100 m long, and an included angle of 120^{C}J Describe first angle projection method.

Q2 (a) Describe first angle projection method.

Solve any one

(b) Draw the projections of following points on the sarnie bar line keeping projections 25 mm apart.

(i) Point a, in the H.P. and 20 mm behind the V.P.

(ii)Point B, 15 mm above H.P. and 50 mm behind V.P.

(iii) Point C, 40 mm above the H.P. and 25 mm in front of VP. j

(iv)Point D, in the V.P. and 40 mm above the H.P

(c) Draw the projection of a line AB when its and A is 2C the H.P. and 10mm in front of V.P. its end B is 55 the H.P. and 80mm infront of the V.P. and the distance between the projections A and B.(measured parallel to the X-Y line) is 45 mm.Find the true length. theta and phi of the its traces.

(d) a line AB 65 mm long is inclined to H.P. at an angle of45° Its end point. A is 15 mm above the H.P. and 25 mm in front of V.P. line AB is contained by a vertical plane making an angle 45°to the V.P. Draw the projections of the line.find the inclination of the line with V.P. and locate its traces.

Q3 (a) Define autxiliary planes and classify.

(b) A cone, base 70 mm and axis length 80 mm is kept on H.P its bar, It is cut by an AIP in such away that the true shape of the section is a hyper bola of base 50 mm and altitude 60 mm. Draw front view, sectional top view and true shape of the section.

(Or)

A cone, base diameter 70 mm and axis length 8Cl mm is kept on the H.P. on its base. It is cut by a section plane perpendicular to both H.P. and V.P. in such a way that the true shape of the section is hyperbola of attitude 50 mm. Draw front view, top view and true shape of the section.

(c) The base surface of a stand is a square of 90 cm sidesand is on ground. The top surface of it is a circle of 30 cm diameter and is 70 cm above the ground. The lower ends of four legs which are equal in length and equally spaced in plan, and art connected to the corners of square in base while the top ends are on the circumference of the circle at top ends are on the circle at top

or

Draw the projections of the stand when the four legs are equally inclined to front wall and find the length of legs and their inclination with ground.

Q4(a) Draw the development of lateral surface of a pentagonal prism with edge of base 40 mm and height 90 mm, kept on H.P. on its base with an edge of base parallel to V.P. when it is cut by an AIP, inclined at 30°to H.P. and bisecting the axis of prism. Draw isometric view of the casting shown in two views in following figure.

Draw the isometric view of the frustum of the hexagonal pyramid having side 40 mm and axis 90 mm long and its base is on the ground as shown I following figure

Q5 (a) What are the reasons for implementing a CAD system? Discuss the various benefits of CAD.

(b) What is Auto CAD? Discuss the functions commands of Auto CAD.

(i) MOVE (ii)EXTRUDE

(iii)STYRETCH (iv)EXTEND

or

(a) Discuss the various applications and limitations of CAD?

(b) Explain various methods for drawing a circle using CIRCLE command in Auto CAD.

(c) Classify the UTILITY commands.