JNTU
JNTU B.Tech I Year ENGINEERING DRAWING Previous Question Paper (December - 2018 - R13)
Answer all five questions
All questions carry equal marks
Main
Construct a pentagon with a side of 25 mm.
Answer
To construct a regular pentagon with a side of 25 mm using the general method:
- Draw a horizontal line segment AB = 25 mm.
- At point B, construct a perpendicular line and mark a point D such that BD = 25 mm.
- Draw the line segment AD. Find the midpoint of AB (let it be M) and the midpoint of the perpendicular BD (let it be N).
- Draw a perpendicular bisector at AB and another at AD; the intersection of these bisectors is the center O of the pentagon.
- With O as the center and OA as the radius, draw a circle.
- Starting from A, mark off arcs of 25 mm length along the circumference to locate the remaining vertices C, D, and E.
- Join the vertices to complete the pentagon.
A ball thrown up in the air reaches a maximum height of 45 meters and travels a horizontal distance of 75 meters. Trace the path of the ball, assuming it to be parabolic.
Answer
To trace the parabolic path of the ball with a maximum height (H) of 45 m and a horizontal range (R) of 75 m, use the rectangular method:
- Draw a rectangle ABCD where the base AB = 75 m (horizontal range) and the height AD = 45 m (maximum height).
- Mark the midpoint of the top side CD as V (the vertex of the parabola).
- Divide the vertical side AD and the horizontal distance from the vertex to the side (half of AB) into the same number of equal parts (e.g., 4 or 6 parts). Label them 1, 2, 3... on AD and 1', 2', 3'... on the horizontal line from V.
- Connect the vertex V to points 1, 2, 3 on the vertical line AD.
- Draw vertical lines upwards from points 1', 2', 3' on the base line.
- The intersection of the line from V to point 1 with the vertical line from 1' gives the first point on the parabola. Repeat this for all points.
- Connect these points with a smooth French curve to trace the parabolic path.
Construct an ellipse when the distance of the focus from the directrix is equal to 80 mm and eccentricity is 3/5.
Answer
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The actual length of 500 m is represented by a line of 15 cm on a drawing. Construct a vernier scale to read up to 600 m. Mark on the scale a length of 549 m.
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The front view of a line makes an angle of 30° with xy. The HT of the line is 45 mm in front of the V.P while its VT is 30 mm below the HP. One end of the line is 10 mm above the H.P and the other end is 100 mm in front of the V.P. Draw the front and top views of the line. Find into true length and inclinations with H.P. and V.P.
Answer
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A point P is 20 mm below the H.P and lies in the third quadrant. Its shortest distance from xy is 40 mm. Draw its projections.
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A regular pentagon of 30 mm sides is resting on H.P on one of its sides while its opposite vertex (corner) is 30 mm above H.P. Draw projections when side in H.P is 30° inclined to V.P.
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A hexagonal pyramid, base 25 mm side and axis 50 mm long has an edge of its base on the ground. Its axis is inclined at 30° to the ground and parallel to the V.P. Draw its projections.
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Draw the projections of a cylinder 75 mm diameter and 100 mm long, lying on the ground with its axis inclined at 30° to the V.P and parallel to the ground.
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A square prism, side of base 30 mm and axis 60 mm long rests its base on H.P and one of its regular faces is inclined at 30° to V.P. A section plane perpendicular to V.P and inclined at 60° to H.P, cuts the axis of the prism at a point 20 mm from its top end. Draw sectional top view and true shape of section.
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Draw the development of the lateral surfaces of a square pyramid, side of base 25 mm and height 50 mm, resting with its base on H.P and an edge of the base parallel to V.P.
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Draw the development of the lateral surface of a cone of base diameter 48 mm and altitude 55 mm.
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Draw the isometric view for the shown in figure 1. All dimensions are in mm.
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Draw: (figure 2).
a) Front View
b) Top View
c) Side View.
All dimensions are in mm.
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