B.E. (First Semester) Examination, Jan/Feb 2006
BE-105(N) Engineering Graphics (Common for all branches)
Time : 3 hrs
Maximum Marks : 100
Minimum Pass Marks : 35
Note : Answer all questions. Total six questions are to be attempted. There is internal choice within each question. Answer of all objective questions should be at one place in the beginning. Assume suitable data wherever necessary.
1. Answer any TEN questions. (20 Marks)
(i) Drawings of buildings are drawn using the following scale:
(a) 1:100 (b) 2:1 (c) 1:1 (d) None of these
(ii) The ratio of the length of the drawing of the object to the actual length of the object is called:
(a) Reduced scale (b) R.F. (c) Object-drawing (d) None of these
(iii) When a cone is cut by planes at different angles, the curves of intersection are called:
(a) Vertices (b) Conic sections (c) Ellipse (d) None of these
(iv) The curve generated by a point fixed to circle inside its circumference, when it rolls along a circle inside, it is called:
(a) Involute (b) Cycloid (c) Hypocycloid (d) Epicycloid
(v) For drawing thin lines of uniform thickness the pencil should be sharpened in the form of:
(a) Chisel edge (b) Conical (c) Pointed (d) Trapezoidal
(vi) The scale of chords is used to set out or measure:
(a) Chords (b) Lines (c) Angles (d) None of these
(vii) When the drawing is drawn of the same size as that of the object, the scale used is:
(a) Diagonal scale (b) Full size scale (c) Vernier scale (d) None of these
(viii) When measurements are required in three units, the scale is used as:
(a) Diagonal (b) Plain (c) Comparative (d) None of these
(ix) When the cutting plane makes the same angle with the axis as do the generator, the curve is:
(a) Hyperbola (b) Parabola (c) Ellipse (d) None of these
(x) In a conic the line passing through the fixed point and perpendicular to the fixed line is called the:
(a) Major axis (b) Directrix (c) Minor axis (d) None of these
(xi) The line joining any point on the spiral with the pole is called:
(a) Major axis (b) Minor axis (c) Asymptotes (d) None of these
(xii) The curve generated by a point on the circumference of a circle rolling along a straight line is called a:
(a) Involute (b) Cycloid (c) Hyperbola (d) None of these
(xiii) The isometric scale and true length of the object are
(a) Same (b) Less than true length (c) More than true length (d) None of these
(xiv)For a cylindrical object the minimum number of views are required to represent fully are
(a) Two views (b) Four views (c) Single view (d) None of these
(xv) The polyhedra is a solid defined as
(a) Bounded by planes called faces (b) Generated by revolution of a plane (c) Generated by revolution of a triangle (d) None of these
2. (a) The major axis of an ellipse is 120 mm long and the minor axis is 80 mm long. Draw the ellipse by arcs of circles method.
Ans: Similar to problem 5.33 page 5.26, ED - Basant Agrawal, TMH.
(b) A circle of 50 mm diameter rolls on the circumstances of another circle of 175 mm diameter and outside it. Trace the locus of a point on the circumference of the rolling circle for one complete revolution.
Ans: Similar to problem 6.2 page 6.2, ED - Basant Agrawal, TMH.
Or
(a) Construct a scale of R.F. = 1/2.5 to show decimeters and centimeters and by a vernier to read millimeters, to measure upto 4 decimetres.
Ans: Similar to problem 4.27 page 4.20, ED - Basant Agrawal, TMH.
(b) A circle of 40 mm diameter rolls on the inside of a circle of 90 mm diameter. A point P lies within the rolling circle at a distance of 15 mm from its centre. Trace the path of the point P for one revolution of the circle.
Ans:
3. (a) A room is 4.8 m × 4.2 m × 3.6 m high. Determine graphically the distance between a top corner and the bottom corner diagonally opposite to it.
Ans: Similar to problem 9.43 page 9.43, ED - Basant Agrawal, TMH.
(b) A line AB, inclined at 40º to the VP has its ends 50 mm and 20 mm above the HP. The length of its front view is 65 mm and its VT is 10 mm above the HP. Determine the true length of AB, its inclination with the HP and its HT.
Or
(a) A point P is 20 mm below HP and lies in the third quadrant. Its shortest distance from xy is 40 mm. Draw its projections.
(b) The front view of a line AB measures 65 mm and makes an angle of 45º with xy. A is in the HP and makes and the VT of the line is 15 mm below he HP. The line is inclined at 30º to the VP. Draw the projections of AB and find its true length and inclination with the HP. Also locate its HT.
4. (a) A regular hexagon of 40 mm side has a corner in the HP. Its surface is inclined at 45º to the HP and the top view of the diagonal through the corner which is in the HP makes an angle of 60º with the VP. Draw its projections.
(b) Draw the three views of the cone, base 50 mm diameter and axis 75 mm long, having one of its generators in the VP and inclined at 30º to the HP, the apex being in HP.
Or
(a) A tetrahedron of 75 mm long edges has one edge parallel to the HP and inclined at 45º to the VP while a face containing that edge is vertical. Draw its projections.
(b) A plate having shape of an isosceles triangle has base 50 mm long and altitude 70 mm. It is so placed tat in the front view it is seen as an equilateral triangle of 50 mm side and one side inclined at 45º to xy. Draw its top view.
5. A cylinder, 65 mm diameter and 90 mm long, has its axis parallel to the HP and inclined at 30º to the VP. It is cut by a section plane in such a way that the true shape of the section is an ellipse having the major axis 75 mm long. Draw its sectional front view and true shape of the section.
Or
A frustum of a square pyramid has its base 50 mm side, top 25 mm side and height 75 mm. Draw the development of its lateral surface.
6. (a) A cylindrical block of base 60 mm diameter and height 90 mm standing on the HP with its axis perpendicular to the HP. Draw its isometric view.
(b) Draw the following views of the object shown pictorially in Fig. 1
(i) Front view (ii) Plan
Or
Draw the following views of the object shown pictorially in Fig. 2
(i) Front view (ii) Plan
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