Session 2: Tools of Engineering Drawing
Unit 1: Engineering Drawing
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. A drawing is a …………..representation of a real object.
Ans: graphical
2. Engineering drawings do not portray the objects the waythey………… to the eye.
Ans: appear
3. The scale of 1:1 implies the object has been drawn to…………….size.
Ans: full
4. Hidden lines represent features that cannot be seen in the……………view.
Ans: normal
5. In an isometric projection, all dimensions along all the…………are drawn to…………… size.
Ans: three axes, foreshortened
B. State whether the following statement are true or false.
1. A4 paper size has dimensions of 297 x 420 mm.
Ans: False
2. Break lines are used to represent an imaginary cut, so that theinterior of the object can be viewed.
Ans: False
3. A scale of say 2:1 implies that the object has been enlarged twiceits true size.
Ans: True
4. In diametric projection, all dimensions with two axes are drawnto true size.
Ans: True
5. In an isometric projection, all dimensions along all the three axesare not drawn to true size.
Ans: True
6. Orthographic views help to record the shapes of objects accuratelyand completely.
Ans: True
7. A nonagon is a plane figure bounded by nine sides.
Ans: True
8. In the First Angle Projection the front view is the basis (reference) andthe other views are drawn as ‘shadows’ of that view.
Ans: True
9. In every engineering drawing, a Title Block is included at thebottom right-hand corner.
Ans: True
10. Spacing of views on the drawing paper is not important.
Ans: False
C. Multiple choice questions
1. A drawing is a graphical representation of a ……………
(a) real object
(b) mirror object
(c) projection
(d) None of the above
Ans: (a) real object
2. The drawing scale is also called…………..
(a) representative fraction (RF)
(b) projection factor
(c) geometric fraction
(d) None of the above
Ans: (a) representative fraction (RF)
3. The common paper sizes for technical drawings are knownas……………
(a) A-Formats
(b) B-Formats
(c) AO-Formats
(d) A2-Formats
Ans: (a) A-Formats
4. Which lines show imaginary features, such as a moving positionof a part?
(a) Phantom lines
(b) Break lines
(c) Hidden lines
(d) Centre line
Ans: (a) Phantom lines
5. Which line explains symmetry, axis of symmetrical parts, centresof circles and path of motion?
(a) Center line
(b) Break lines
(c) Hidden lines
(d) Hidden lines
Ans: (a) Center line
D. Answer the following questions
1. Why are engineering drawings important in manufacturing andassembly?
Ans: Engineering drawings are important in manufacturing and assemblybecause they provide complete and accurate information about the shape, size, dimensions, and specifications of components. They ensure propermanufacturing, correct assembly, and interchangeability of parts.
2. What are the steps required for making an engineering drawing?
Ans: First, select the suitable paper size and scale. Then draw the referencelines and views of the object. Add dimensions, symbols, and necessary details. Finally, complete the drawing with proper title block and check for accuracy.
3. What is the importance of scale in making an engineering drawing?
Ans: Scale is important because it allows large or very small objects to bedrawn accurately on a drawing sheet. It helps in maintaining proportion andenables easy understanding of the actual size of the object.
4. List the differences between diametric and isometric projection.
Ans: In diametric projection, dimensions along two axes are drawn totrue size, whereas in isometric projection, dimensions along all three axes areforeshortened. Diametric projection is less commonly used compared toisometric projection.
5. Give the different formats of paper sizes used in makingengineering drawing.
Ans: The different paper formats used are A0, A1, A2, A3, and A4.
6. Write down the steps for reading engineering drawing.
Ans: First, read the title block to understand basic information. Then studythe different views of the object. Observe dimensions, symbols, and notescarefully. Finally, visualize the object by combining all views.
