JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year ENGINEERING GRAPHICS Previous Question Paper (September/October - 2021 - R18)
Answer any three questions. All questions carry equal marks.
Main
A circle of 60 mm diameter rolls along a straight line. Trace the path of a point on the periphery of the circle. Name the curve.
Answer
The curve traced by a point on the periphery of a circle rolling along a straight line is called a Cycloid.
Construction Procedure:
- Draw a circle of diameter 60 mm (radius R = 30 mm).
- Draw a horizontal line representing the path of the circle, with length equal to the circumference of the circle, πD = 3.14 × 60 ≈ 188.5 mm.
- Divide the circle into 12 equal parts and label them 1, 2, ..., 12.
- Divide the straight line into 12 equal parts and label them 1', 2', ..., 12'.
- Draw horizontal lines from the division points of the circle.
- Draw vertical lines from the division points on the straight line to locate the centers of the circle at different positions (C1, C2, ..., C12).
- With radius R = 30 mm and centers C1, C2, ..., C12, draw arcs to intersect the corresponding horizontal lines.
- Join these intersection points with a smooth curve to obtain the Cycloid.
Construct a scale of 1/60 to read meters and decimeters and long enough to measure up to 6 meters. Mark on it a distance of 5.4 m.
Answer
To construct a scale with Representative Fraction (R.F.) of 1/60 to measure up to 6 meters:
- Calculate Length of Scale (L.O.S.):
- Draw a line 10 cm long and divide it into 6 equal parts, each representing 1 meter.
- Divide the first part into 10 equal subdivisions, where each subdivision represents 1 decimeter (0.1 m).
- Label the main divisions 0, 1, 2, 3, 4, 5 meters and the subdivisions 0 to 10 decimeters.
- To mark 5.4 m, place one end of the distance at the mark '4' on the meter scale and the other end at the '14' mark (4 meters + 14 decimeters = 5.4 meters) or simply measure 5 meters from the '0' mark and 4 decimeters from the '0' mark towards the left.
Draw the projections of the following points on a common reference line keeping the distance between their projectors 30 mm apart:
- i) Point A is 20 mm below the H.P. and 50 mm in front of the V.P.
- ii) Point B is in the H.P. and 40 mm behind the V.P.
- iii) Point C is 30 mm in front of the V.P. and in the H.P.
- iv) Point D is 50 mm above the H.P. and 30 mm behind the V.P.
- v) Point E is 20 mm below the H.P. and 50 mm behind the V.P.
Answer
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Line AB is 75 mm long and it is 30° & 40° inclined to HP & VP respectively. End A is 12 mm above HP and 10 mm in front of VP. Draw projections. Line is in 1st quadrant.
Answer
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A cone base 50 mm diameter and axis 60 mm long rests with its base on HP. It is cut by a section plane perpendicular to HP and inclined at 60° to VP and at a distance of 10 mm from its axis. Draw the sectional front view and the true shape of the section.
Answer
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A pentagonal prism having a base with 30 mm side and 65 mm long axis, is resting on its base in the H.P. with a rectangular face parallel to the V.P. It is cut by a section plane perpendicular to the V.P., inclined at 30° with the H.P., and passing through a point on the axis, 25 mm from one of the bases. Draw the development of lateral surface of bottom part.
Answer
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Draw the Isometric view of the machine parts shown in figure 1. All dimensions are in mm.
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Draw the orthographic projections of the machine part shown in figure 2. a) Front view b) Top view c) Side view. All dimensions are in mm.
Answer
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