basic engineering graphics unit-i points, … · 1.draw the top view and front view of a cube of...

BASIC ENGINEERING GRAPHICS

UNIT-I

POINTS, LINES & PLANES

SUBJECT CODE:BME13002 PART-A

2 Mark Questions & Answers

1. A point is situated in the first quadrant.

It is above HP and infront of VP.

2. The top and front views of a point lie below XY. Name the quadrant in which the point is

situated.

Fourth Quadrant.

3. State the reason why second and fourth angle projection methods are not adapted.

Both the top and front views obtained by second and fourth angle projection

methods lie on oneside of the reference line.It will create confusion.Hence the second and fourth

angle projection methods are not adapted.

4. State any 3 methods of finding the true length and true inclinations of a line from its projections.

i) Rotating line method

ii) Rotating trapezoidal plane method

iii) Auxiliary plane method.

iv)

5. True angles of inclination are lesser than the apparent angle of inclination.

6. Define Oblique line.

A straight line inclined to both HP and VP is called an oblique line.

7. When a straight line lies in a plane perpendicular to both HP and VP , the value of =90°.

8. What is a plane?

A plane is a 2 dimensional surface, area or object having only length and breadth. A plane

bounded by straight lines or curves or both.

9. A circular lamina is held inclined to both HP and VP. Its top view has a shape of ellipse and front

view has a shape of ellipse.

PART-B

1. A line AB 60mm long is perpendicular to HP and parallel to VP. One end of a line is 20mm

above HP &15mm infront of VP. Draw its projections

2. A line PQ 70mm long is perpendicular to VP and parallel to HP. One end of a line is 30mm

above HP &15mm infront of VP. Draw its projections

3. A line CD50mm long is parallel to both the planes HP&VP. 35mm infront of VP and 30mm

above HP. Draw its projections

4. A line PQ 50mm long is inclined at 30° to HP and parallel VP. The end P is 15mm above HP&

20mm infront of VP. Draw its projections of lines.

5. . Draw its projections of a straight lines EF 60mm long parallel to HP& inclined at an angle of

35° to VP. The end E is20mm above HP &15mm infront of VP.

6. A line GH 80mm long is inclined at both the planes HP&VP. Its an angle of 30° to HP& 45°

toVP. The end G is 20mm above HP & 30mm infront of VP. Draw its projections of lines.

7. Draw the projections of point in common reference line

1. P 35mm behind VP & 20mm below HP.

2. Q 40mm infront of VP & 30mm above HP.

3. R 50mm behind VP & 15mm above HP.

4. S 40mm below HP & in VP.

5. T 30mm infront VP &50mm below HP.

6. U 35mm behind VP &in HP.

8. Draw the projections of point in common reference line

1. A 25mm below HP & in VP.

2. B 40mm behind t of VP &in HP.

3. C 30mm below HP & 30mm infront of VP.

4. D 25mm above HP & 25mm behind of VP.

5. E 25mm aboveHP &30mm infront of VP.

6. F in both HP&VP

7. G 35mm below HP & 30mm behind of VP.

8. E 30mm above HP & 35mm behind of VP.

9. A square lamina 40mmx40mm perpendicular to HP and parallel to VP. Draw its projection of a

plane surfaces.

10. A rectangular lamina 60mmx40mm perpendicular to HP and parallel to VP. Draw its projection

of a plane surfaces.

11. A circular lamina diameter is 50mm perpendicular to VP and parallel to HP. Draw its projection

of a plane surfaces & right side view

12. A hexagon lamina sides 25mm perpendicular to VP and parallel toHP. Draw its projection of a

plane surfaces & left side view

13. A pentagon lamina sides 25mm perpendicular to VP and parallel toHP. Draw its projection of a

plane surfaces & left side view

UNIT-II

PROJECTION OF SOLIDS

PART-A


1 .Define solids?

A solids is defined as an object having three dimensions,length, breath & height or thickness,measured

along the three mutually perpendicular axis.

2 .What are the classification of solids?

1.Polyhedra

2.solids of revolution

3.truncated solids.

3. What are the types of polyhedral?

1.Regular polyhedral

2.Prisms

3.Pyramids

4. What is prisms?

A Prism is said to be a right regular prism w3hen its axis is perpendicular to its base and all its faces are

equal rectangles.

5. What is pyramids?

A Pyramid is a polyhedron having a plane fig as its base and a number of equal isosceles triangular

faces meeting at a point called vertex or apex.

PART-B

1.Draw the top view and front view of a cube of 40mm side rests with one of its square faces on HP.

2.Atriangular prism of base side 35mm & Height 50mm rests with its base on HP such that one of its

rectangular face is perpendicular to VP.The nearest edge parallel to VP is 10mm infront of VP.Draw its

projection.

3.)Draw the projection of a cylinder of base 30mm diameter and axis 50mm long resting with its bas on

HP and axis 25mm in front of VP.

4.)A hexagonal prism side of base 25mm and axis 50mm long ,lies withone of its rectangular faces on hp

such that axis is perpendicular to VP. draw it front view and Top view.

5.)A Pentagonal pyramid side on base 25mm & height 50mm rest with its HP such that one of the edges

of the base is perpendicular to VP. Draw a top view &Front view left side view of a pyramid.

6.Draw the projection of a right circular cone of base 40mm dia&ht 60mm when resting with its base on

HP.

7.)A square pyramid,Side of base 30mm & axis 50mm long rest with its base on HP.

Such that one of its edges of the base is parallel to and 10mm in front of VP draw its projection.

8.)A hexagonal pyramid side of base 30mm &Ht 60mm rests with bas e on HP such that one of the edges

of the base is parallel to &10mm infornt of VP.Draw its projection.

UNIT-III

DEVELOPMENT OF SURFACE AND ISOMETRIC PROJECTION

PART-A


1. Whatis the development of surface?

When all the surfaces of the object are laid out on a plane surface. It is called development, it show

the true shape of all the surface.

2. What are the applications of development of surfaces?

1.Sheet metal work for making boiler shells,chimneys,funnels,dust etc.

2.Automobile, airplane and ship building industries.

3. What are the two methods of development of surfaces?

1.parallel line method 2. Radial line method

4. Where is parallel line method used?

Prisms and cylinders.

5. Where is radial line method used?

Pyramids and cones.

6. What is isometric projection .

When the three axis of an object are equally inclined to the plane of projection ,the

projection obtained is called isometric projection . The three dimensions of the object are equally

foreshortened .

7. What is difference between isometric projection or isometric view or drawing ?

In isometric projection , three dimensions are equally foreshortened . So it is drawn with a

special scale known as isometric scale .Isometric length =0.816 of true length .

Isometric view is drawn with true scale .

8.What is isometric length ?

Isometric length =. 816 * true length .

9. What are the two methods of drawing isometric views ?

(i) Box method .

(ii)Offset method or co-ordinates method .

10. What are isometric axes ?

Length axis ,width axis, and height axis which are equally inclined 120 degree to each

other, are called isometric axes .

11. What is isometric line ?

Line parallel to any one isometric axis is isometric line.

12. What is non –isometric line?

Inclined line not parallel to any one isometric axis ,is non-isometric line .

13. What are the uses of isometric views ?

(i)A common man can understand the object clearly and quickly .

(ii) They are used in advertisements and catalogues .

14. What are the types of pictorial drawings ? A

(i) isometric drawing (ii) oblique drawing (iii) perspective drawing .

15. Differentiate between isometric projection and orthographic projection .

Sl

no

Isometric projection Orthographic projection

1 3-D View 2-D view

2 Only one view Two or more views necessary

3 Does not show true shape Shows true shape

4 Does not show hidden details Shows hidden details

PART-B

1. A square prism sizes 50mmx30mm. Draw the development of the lateral surface.

2. A rectangle prism sizes 70mmx40mmx20mm. Draw the development of the lateral surface.

3. A square pyramid sizes 60mmx40mm. Draw the development of the lateral surface.

4. A cylinder 60mm long 50mmdiameter. Draw the development of lateral surface.

5. A cone of diameter 50mm and height is60. Draw the development of lateral surface.

6. A hexagon pyramid of base side 25mm and height 70mm. Draw the development of lateral

surface

.

7. Draw the isometric view of the cube of sides 40mmx40mm

8. Draw the isometric view of the square prism of height 60mmx 40mmx40mm.

9. Draw the isometric view of the rectangular 70mmx 40mmx20mm

10. Draw the isometric view of the triangular prism 70mmx30mm

11. Draw the isometric view of the square pyramid height 70mmx40mm.

12. Draw the isometric view of the cone of diameter 40mm and height 60mm

13. Draw the isometric view of the pentagon prism base 25mm and height 60mm.

14. Draw the isometric view of the pentagon pyramid base 25mm and height 60mm

15. Draw the isometric view of the hexagon pyramid base 25mm and height 60mm

16. Draw the isometric view of the hexagon prism base 25mm and height 60mm

UNIT-IV

ORTHOGRAPHIC PROJECTION

PART-A 2 Mark Questions & Answers

1. What is orthographic projection?

It the object is viewed perpendicular to the plane of projection , the projection obtained on the plane is

called orthographic projection.

2. Name the two system sof orthographic projection?

1)first angle projection 2) third angle projection.

3. what is first angle projection?

When the object is placed in the first quadrant the projection obtained on horizontal

plane,vertical plane and profile plane is first angle projection.

4. What is the third angle projection?

When the object is placed in the third quadrant, the projection obtained on HP, VP and PP is

third angle projection.

5. Show the BIS symbol for first and third angle projection?

6. Show the relative positions of the views in first angle projection.

7. Show the relative position of view in third angle projection.

Right

side

view

Front

view

Left

side

view

Top

view

PART-B 1. Draw the orthographics projection front view, top view & side view

Top

view

Front

view

Left

side

view

Right

side

view

2. Draw the ortho graphics projection front view, top view & side view


UNIT-V

COMPUTER AIDED DRAFTING

PART-A


1. What is cad used for?

Cad is a computer aided software used to draw diagrams of any object in either 2D or 3D format and view

their front, top, and side views.

2. Abbreviate CADD.

Computer aided design and drafting

3. What are the various applications of CADD?

CADD is used in various engineering branches like

A) Mechanical

B) Automobile

C) Electrical

D) Electronics

E) Civil

F) Architectural

4. What is interactive computer graphics ?

A way which he or she maintains a conversation or a dialogue with the computer.

5 .Name any for cad oriented software.

Auto CAD, unigraphics, I – deas, pro engineer are some software used in the field of CADD

8. Explain any four basic command of CAD.

Line, circle, 2 point and 3 point arcs, rectangle, ellipse are some of the basic commands used in CADD.

9. Explain co-ordinate system.

Co-ordinate is based on the origin (0,0)when the X,Y values are known of the point from the origin.

10. What are the types of auto cad modes ?

Gridded, isometric, orthographic and 2D are the three modes used in auto CADD

11. What are utility commands?

NEW, OPEN, CLOSE, SAVE, EXIT are the utility commands used in AUTO CAD.

12. Why and when is a zoom command used?

While drawing, it is required to bring the area of our interest to fours on to the screen. ZOOM command enlarges or

reduces the view of the drawing.

13. What is an O-SNAP?

Using O-SNAP, you can locate an exact position of an object like end point or mid point of a line, intersection of

two lines, centre of the circle etc. Without knowing the co-ordinates.

14. What is a chamfer command used for?

Chamfer is used to draw a line at the Conner between two selected lines.

15. Why is a fillet command used for ?

Fillet command is used to draw an arc joining the two adjacent lines at the Conner.

16. What is polar tracking?

Polar tracking is switched on when angles come into concern and precision oriented angle diagrams are to be drawn

17. What are the three object selection methods?

1) pick box method.

2) windows.

3) crossing

Are the three objects selection methods.

basic engineering graphics unit-i points, … · 1.draw the top view and front view of a cube of...

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