Q38 – What are the main uses of scale? The length and width of the field, on the map is 10 Conventional Practices for Orthographic and Sectional Views (Full and Half Section) 2. Rationale: Engineering Drawing is an effective language of engineers. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 1:50000 represents the map scale as a mathematical ratio or fraction, thus the name ratio scale or fractional scale. Conventional Practices for Orthographic and Sectional Views (Other Type Sections) 3. ME111: Engineering Drawing ... A line of 1 meter length is shown by 1 cm on the drawing sheet. When a 1 cm long line in a drawing represents 1 GUJARAT TECHNOLOGICAL UNIVERSITY Engineering Graphics 1. A Text book of Engineering Drawing Plane Solid Geometry N.D. Bhatt.Dhananjay A Jolhe, Engineering Drawing, Tata McGraw Hill, 2007. ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. What is R.F in Engineering drawing? here the ratio called representative factor is more than unity. The full form of R.F is representative fraction. Use of plane scales and Representative Fraction. Methods for converting toleranced dimensions to SI are presented. representative fraction (r.f. Introduction to Engineering Graphics, Drawing instruments and accessories, BIS - SP 46. b length of scale (in cm) = r.f. Elementary Engineering Drawing by N.D.Bhatt Charotar Publishing.Importance of Engineering Drawing, Scales: Representative Fraction, Type of. Q37 – What is the representative fraction (R.F.) 10mm 1 metre 10mm 1000mm = = 1 100 Suppose a line of 10 mm length in drawing represent 1 mm length of object R.F. Isometric Drawing 4. R.F=(Drawing dimension / actual dimension) Classification of scales depending on R.F. )a = length of drawing in cm actual length in cm area of drawing in cm² actual area in cm² = v = volume as per drwg in cm³. The primary problem faced in learning and teaching of engineering drawing is the limited availability of text books that focus on the basic rules and CHAPTER 7 SAMPLE CALCULATIONS. use following formulas for the calculations in this topic. x max. Representative fraction The ratio of the dimension of the element in the drawing to the dimension of the same element in the object is called the representative fraction. Engineering drawing II tutorial solution is prepared to help engineering students to score good marks in the IOE Exam. CHAPTER 6 ENGINEERING DRAWINGS. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. Engineering Drawing is one of the basic courses to study for all engineering disciplines. = Dimension of an object on sheet / Actual dimension of an object. Depending on R.F, scales can be divided into three categories: length to be measured in cm. Content : 1. The use of SI units in engineering drawings, including "dual dimensioning", is covered in this chapter. 1:50000 can be shown as 1/50000 as well. It is a ratio of any dimension of the object shown in the drawing to that of the actual dimension of the object. NPTEL provides E-learning through online Web and Video courses various streams. 5. Its representative fraction (RF) is _____ 1/100 16 The size of the letter is described by its _____ height 17 The area of a field is 50000 m2. 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