Class 11 Automotive Service Technician Chapter 1 Engineering Drawing

Class 11 Automotive Service Technician Chapter 1 Engineering Drawing Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Automotive Service Technician Chapter 1 Engineering Drawing Question Answer and select need one. Class 11 Automotive Service Technician Chapter 1 Engineering Drawing Notes Download PDF. AHSEC Class 11 Automotive Service Technician Question Answer English Medium

Class 11 Automotive Service Technician Chapter 1 Engineering Drawing

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Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Class 11 Automotive Service Technician Chapter 1 Engineering Drawing Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 11 Automotive Service Technician Textbook Solutions English Medium for All Chapters, You can practice these here.

Engineering Drawing

Chapter: 1

A. Fill in the blanks: 

1. The understanding of plane geometry is pre-requisite for the proper use of ___________. 

Ans: Geometric constructions.

2. A plane figure surrounded by ______________________ forms a triangle. 

Ans: Three straight sides.

3. A scalene triangle is formed by three ___________ sides and three ___________. 

Ans: Unequal sides, unequal angles.

4. A figure bounded by ___________ sides is called quadrilateral. 

Ans: Four.

5. A quadrilateral with ___________ sides is called rhombus. 

Ans: Four straight.

6. A plane figure bounded by more than ___________ sides is called a polygon. 

Ans: Three.

7. A plane figure bounded by ___________ sides is called a heptagon. 

Ans: Seven.

8. A plane figure bounded by ___________ sides is called a decagon.

Ans: 10.

B. State whether the following statements are true or false: 

1. Bisecting the line means dividing the line into two equal parts. 

Ans: True.

2. If one line is perpendicular to another line, they intersect each other at 45°. 

Ans: False.

3. A triangle having all the three sides equal is called an equilateral triangle. 

Ans: True.

4. A plane figure with more than five sides is called a quadrilateral. 

Ans: False.

5. A quadrilateral with all four equal sides is called a rhombus. 

Ans: True.

6. A quadrilateral with one pair of opposite side parallels is called a trapezium. 

Ans: True.

7. A plane figure bounded by eight sides is called a heptagon. 

Ans: False.

8. A plane figure bounded by nine sides is called a nonagon. 

Ans: True.

C. Multiple choice questions: 

1. Which method is used for drawing various geometric shapes? 

(a) Geometric construction. 

(b) Polygon method. 

(c) Contour method. 

(d) None of the above. 

Ans: (a) Geometric construction. 

2. An isosceles triangle has _____________. 

(a) Two equal sides and angles. 

(b) Two equal sides and angles.

(c) Three equal sides and angles. 

(d) None of the above. 

Ans: (a) Two equal sides and angles. 

3. An equilateral triangle is formed by _____________. 

(a) Equal sides and equal angles. 

(b) Only equal sides. 

(c) Only angles. 

(d) No equal side or angle. 

Ans: (a) Equal sides and equal angles.

4. What is the sum of all three interior angles of a triangle equal to? 

(a) 180 degrees.

(b) 90 degrees. 

(c) 360 degrees.

(d) 60 degrees.

Ans: (a) 180 degrees.

5. A figure bounded by four straight sides is called a ____________. 

(a) Quadrilateral. 

(b) Square. 

(c) Triangle. 

(d) Equilateral triangle.

Ans: (a) Quadrilateral.

D. Answer the following questions: 

1. Why are geometric constructions important in making drawings? 

Ans: Geometric constructions help students in developing skills to handle drawing tools and promote logical thinking. Engineering drawing is a representation of graphical language, hence, involves geometrical constructions. It provides all the information about an item or product to the user and helps the mechanist or technician to develop the required product.

 2. What are the steps required for dividing a straight line into seven equal parts? 

Ans: The steps required for dividing a straight line into seven equal parts are as under:

(i) Using a scale draw a line AB. This line is to be divided into equal parts.

(ii) From point A of this line draw a second line at any convenient angle.

(iii) Open a compass to a suitable length and divide the second line into 7 equal parts (points C−G) without altering the compass opening.

(iv) Connect G to B.

(v) Using set squares, draw parallel lines to GB from all the points (points F-C).

(vi) Thus, the line AB gets divided into 7 equal parts.

3. Differentiate between triangle and quadrilateral.

Ans: The different between triangle and quadrilateral are as under:

 4. Differentiate between quadrilateral and polygon.

Ans:

5. List the steps for making a polygon having 10 equal sides.

Ans: The steps for making polygon having 10 equal sides are as under: 

(i) Using a scale draw a line AB equal in length to one of the given sides. Extend the line AB to a point P.

(ii) The exterior angle of the polygon is calculated by dividing 360° by the number of sides of the polygon. In this case the regular polygon is to be a decagon, therefore the exterior angle is 360°/10.

(iii) At point B draw the exterior angle PBC. Mark off BC equal to AB.

(iv) Bisect the lines AB and BC. The bisectors intersect at point O as shown in Fig.1.24.

(v) Open the compass equal to radius OA (OB = OC) and with the needle at O draw a circle.

(vi) Mark off the sides of the figure with a compass opening equal to the side of the polygon from C to D, D to E, E to F, and F to G.

(vii) Join the points on the circumference and ABCDEFGHIJ is the required decagon.

 6. Draw tangents from a given point lying on the diameter of the circle to the circle.

Ans: (i) Draw a circle with center O and radius r.

(ii) Mark the point P on the diameter of the circle.

(iii) Draw a perpendicular from point P to the center O of the circle.

(iv) Let the perpendicular meet the circle at point Q.

(v) The line segment PQ is the required tangent to the circle.

A. Fill in the blanks:

1. A drawing is a _______________ representation of a real object. 

Ans: Smaller.

2. Engineering drawings do not portray the objects the way they _______________ to the eye. 

Ans: Appear.

3. The scale of 1:1 implies the object has been drawn to _______________ size. 

Ans: True.

4. Hidden lines represent features that cannot be seen in the _______________ view. 

Ans: Current.

5. In an isometric projection, all dimensions along all the _______________ are drawn to _______________ size.

Ans: Three axes, true.

B. State whether the following statements are true or false: 

1. A4 paper size has dimensions of 297 × 420 mm. 

Ans: False.

2. Break lines are used to represent an imaginary cut, so that the interior of the object can be viewed. 

Ans: True.

3. A scale of say 2:1 implies that the object has been enlarged twice its true size. 

Ans: True.

4. In diametric projection, all dimensions with two axes are drawn to true size. 

Ans: False.

5. In an isometric projection, all dimensions along all the three axes are not drawn to true size. 

Ans: False.

6. Orthographic views help to record the shapes of objects accurately and 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) and the other views are drawn as ‘shadows’ of that view. 

Ans: True.

9. In every engineering drawing, a Title Block is included at the bottom right-hand corner. 

Ans: False.

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 known as ________________.

(a) A-Formats.

(b) B-Formats.

(c) A0-Formats.

(d) A2-Formats.

Ans: (a) A-Formats.

4. Which lines show imaginary features, such as a moving position of 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, centres of 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 and assembly?

Ans: A drawing is a graphical representation of a real object. An engineer expresses his ideas on a paper through the medium of drawing. The use of a drawing is to explain the shape and size of a particular object by means of lines. It also explains about the object, which cannot be expressed by lines given alongside the drawing in a concise manner. A good drawing gives detailed information about the object in a precise way. 

For better understanding of a drawing, a person should know the standard conventions, basic symbols and rules used in the different types of drawings

 2. What are the steps required for making an engineering drawing?

Ans: The steps required for making an engineering drawing are:

(i) Decide on the views to be drawn (i.e., front view, left-hand side view, and top view).

(ii) Determine the maximum dimensions of the various views to be drawn.

(iii) Determine the required space, based on the scale to be used, both along the horizontal and vertical directions.

(iv) Divide the ‘free space’ into three equal portions, both horizontally and vertically. This determines the spacing as shown in the figure.

3. What is the importance of scale in making an engineering drawing?

Ans: It is difficult to draw on paper the actual size of real-life objects, such as the real size of a car, an airplane, etc., we need scale drawings to represent the size. In real life, the length of this van may measure 6000 mm. It is suggested that the length of print paper that one may use to draw this van should be a little bit less than 300 mm. Since 6000/300 = 20, you will need about 20 sheets of copy paper to draw the length of the actual size of the van. In order to use just one sheet, you may use 1 mm on your drawing to represent 20 mm on the real-life object. We can write this situation as 1:20 or 1/20 or 1 to 20.

4. List the differences between diametric and isometric projection.

Ans: The different  between diametric and isometric projection are as under:

5. Give the different formats of paper sizes used in making engineering drawings.

Ans: 

6. Write down the steps for reading engineering drawings.

Ans: The steps for reading engineering drawing are as under:

(i) Ensure the right drawing is being read – Check the name and part number of the drawing.

(ii) Look at the Title Block – Found at the lower right-hand side of the drawing; includes name of the drafter, checker, firm/institute, drawing number, part number, projection angle, and scale.

(iii) Understand line types – Refer to different lines like object lines, hidden lines, centre lines, etc.

(iv) Observe pictorial drawings – Understand simple objects through pictorial views.

(v) Check orthographic drawings – Understand multiview projections (front, top, side views) for complex objects.

(vi) Identify placement of views – Top view above front view; right side view to the right of the front view.

(vii) Understand dimensions – Width, depth, height dimensions as shown in respective views.

(viii) Identify section views – To view hidden features clearly.

(ix) Interpret dimensions properly – Including projection and dimension lines with proper measurements.

(x) Recognize important symbols – Learn measurement and other symbols used in the drawing.

(xi) Handle drawings carefully – Store safely when not in use to avoid loss or damage.

Parimol

Hi! my Name is Parimal Roy. I have completed my Bachelor’s degree in Philosophy (B.A.) from Silapathar General College. Currently, I am working as an HR Manager at Dev Library. It is a website that provides study materials for students from Class 3 to 12, including SCERT and NCERT notes. It also offers resources for BA, B.Com, B.Sc, and Computer Science, along with postgraduate notes. Besides study materials, the website has novels, eBooks, health and finance articles, biographies, quotes, and more.