JNTU
JNTU B.Tech I Year ENGINEERING DRAWING Previous Question Paper (March/April - 2023 - R15)
Answer any five questions. All questions carry equal marks.
Main
Construct a diagonal scale 1/50, showing metres, decimetres and centimetres, to measure upto 5 metres. Mark a length 4.75 m on it.
Answer
To construct the diagonal scale:
- Calculate the Representative Fraction (RF) = 1/50.
- Calculate the Length of Scale (LOS) = RF × Maximum Length = (1/50) × 500 cm = 10 cm.
- Draw a line AB of 10 cm and divide it into 5 equal parts, each representing 1 metre.
- Divide the first part into 10 equal divisions to represent decimetres.
- Erect perpendiculars at these divisions and draw 10 horizontal lines to create a height of 2-3 cm.
- Divide the vertical height into 10 equal divisions and draw horizontal lines.
- Connect the diagonal lines from the 0th decimetre division to the 1st division above, and so on, to represent centimetres.
- To mark 4.75 m: take 4 metres on the main scale, 7 decimetres on the sub-division, and move up to the 5th horizontal line to locate the 5th centimetre division.
Construct a parabola when the distance of the focus from directrix is 65 mm. Draw tangent and normal at any point on the parabola.
Answer
To construct the parabola:
- Draw a vertical line as the directrix and a horizontal axis perpendicular to it.
- Mark the focus F at 65 mm from the directrix. Mark the vertex V at the midpoint (32.5 mm from both).
- Mark points 1, 2, 3, 4 on the axis beyond V. Draw vertical lines through these points.
- With F as center and distance equal to the distance from the point (e.g., 1) to the directrix, draw arcs to intersect the vertical line at points P1. Repeat for all points to obtain the parabola curve.
- To draw the tangent and normal: select any point P on the curve. Join P to F. Draw a line through F perpendicular to PF to intersect the directrix at T.
- Draw the tangent line passing through T and P.
- Draw the normal line perpendicular to the tangent at point P.
Draw an epicycloid generated by a rolling circle of 60 mm diameter for one complete revolution. The radius of directing circle is 100mm. Draw a tangent and a normal to the curve at 150mm from the center of the directing circle.
Answer
Sign in to view the complete answer paper.
A line PQ has the end P at 10 mm above the H.P. and 15 mm in front of the V.P. The lengths of its front and top views are 60 mm and 50 mm respectively. If the top view of the line is inclined at 30° to the reference line, draw its projections. Determine its true length and inclination with the principal planes. Also, locate its traces.
Answer
Sign in to view the complete answer paper.
A regular pentagon of 30 mm sides is resting on HP on one of its sides while its opposite vertex (corner) is 30 mm above HP. Draw projections when side in HP is 30° inclined to VP.
Answer
Sign in to view the complete answer paper.
A cone 40 mm diameter and 50 mm axis is resting on one of its generators on HP which makes 30° inclinations with VP. Draw its projections.
Answer
Sign in to view the complete answer paper.
A cylinder, 65 mm diameter and 90 mm long, has its axis parallel to the H.P. and inclined at 30° to the V.P. It is cut by a vertical 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.
Answer
Sign in to view the complete answer paper.
A cone of base 50mm diameter and 60mm height rest with its base on HP. It is cut by a section plane perpendicular to VP parallel to one of the generators and passing through a point on the axis at a distance of 22mm from the apex and develops the lateral surface with remaining portion of the cone.
Answer
Sign in to view the complete answer paper.
A cylinder of 60 mm diameter having its axis vertical is penetrated by another cylinder of 40 mm diameter. The axis of the penetrating cylinder is parallel to VP and bisects the axis of the vertical cylinder marking an angle of 60° with it. Draw the orthographic projections and showing the curves of intersection.
Answer
Sign in to view the complete answer paper.
Draw perspective projections of a straight line AB 60mm long is parallel to 10mm above the ground plane and inclined at an angle 45° to PP. The end A is 20mm behind PP. Station point is 35mm in front of PP and 45mm above GP and lies on the central plane passing through the midpoint of AB.
Answer
Sign in to view the complete answer paper.
Draw the front view, top view and left side of the given figure. (All dimensions are in mm).
Answer
Sign in to view the complete answer paper.