1. area of drawing v actual area volume as per drwg. 72 108 120 150 ‘Representative fraction’ (RF) is defined as. stream K���Tމ}�d��;�4��4���wq��H�EE� Engineering Drawing is one of the basic courses to study for all engineering disciplines. ... ISOMETRIC DRAWINGS. The first unit is subdivided into smaller parts. endobj here the ratio called representative factor is more than unity. endobj 0000018016 00000 n
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��Ơt1�9g�D�M�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? Its Representative fraction (RF) is A. Scales on Drawing Sheet i) Representative fraction … E.g. v actual volume b dimensions of large objects must be reduced to accommodate on standard size drawing sheet.this reduction creates a scale of that reduction ratio, which is generally a fraction.. such a scale is called reducing scale and that ratio is called representative factor. Representative Fraction (RF) - Fractional Scale - Ratio Scale: A representative fraction (RF) is the ratio of distance on the map to distance on the ground. Take the value to find the length of the scale. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. These "representative fraction" scales mean that one unit of measurement on the map 1 inch or 1 centimeter represents 10,000 of the same units on the ground. ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q>
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23 0 obj •A plain scale consists of a line divided into suitable number of equal units. = Dimension of an object on sheet / Actual dimension of an object 0000011920 00000 n
There is a ‘Representative fraction’ (RF) and it is defined as? Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. ... Engineering Drawing by ND Bhatt. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. R.F. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer d) Write any four dimension rules e) List out any one difference between First and Third angle Projections f) Sketch Various types of lines used in drawing g) State the name of the conic if eccentrity (e) =1. %PDF-1.3 scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. = = = xcm cm m cm R F. Plain scale. 0000011648 00000 n
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 <<07C7FB82A6EAEF478A2F1A442701E4AA>]>>
Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) startxref
Diagonal Scale_Problem 1 . 0000001374 00000 n
Scales: Representative fraction. B. 17 0 obj Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. 0000002035 00000 n
Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. If the distance of 300 km is presented as 15 cm on the map find representative fraction. These "representative fraction" scales mean that one unit of measurement on the map 1 inch or 1 centimeter represents 10,000 of the same units on the ground. Length of an object in the drawing / Actual length of the object Length of an object in the drawing / Isometric length of the object Actual length of the object / Length of an object in the drawing. So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. the drawing is five times bigger than the actual object. To draw a scale, need to know the “Representative Factor (RF)”. 0000003961 00000 n
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If the scale were Representative fraction (R.F.) T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. 8 0 obj There is a ‘Representative fraction’ (RF) and it is defined as? ... (W07)

Representative Fraction

The ratio of the drawing to the object is called the Representative Fraction. 0000001276 00000 n
Plain Scale_Problem 2 . Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. Easiest way to calculate RF(Representative Fraction ) in hindi. 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 A. Map - Map - Map scales and classifications: Map scale refers to the size of the representation on the map as compared to the size of the object on the ground. Therefore, the representative fraction (R.F.) 3. Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. R.F. Complete Idea of Isometric View and Isometric Projection. 9 0 obj R.F. <> Definition of representative fraction : a map scale in which figures representing units (as centimeters, inches, or feet) are expressed in the form of the fraction 1/ x (as 1/250,000) or of the ratio 1: x to indicate that one unit on the map represents x units (as 250,000 centimeters) on the earth's surface drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. C. Graphical scale : other rfs are described as 1:10, 1:100, 1:1000, 1:1,00,000 scales dimensions of large objects must be reduced to accommodate on standard size drawing sheet.this reduction creates a scale of that reduction ratio, which is generally a fraction.. = Dimension of an object on sheet / Actual dimension of an object. What is the type of scale in which the representative fraction is 1:1? representative fraction (r.f. 0000015891 00000 n
When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). The distance between two places is 240km and its equivalent distance on map is 12cm. Ans38 – The following are the main uses of scale in engineering practice. endobj Or it is also called Scale factor. )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. Q37 – What is the representative fraction (R.F.)
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length to be measured in cm. The actual length of the object / Length of an object in the drawing B. Isometric length of the object / Length of an object in the drawing C. Length of an object in the drawing / Actual length of the object D. Length of an object in the drawing / … A. This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. Plain scale construction in engineering drawing - Duration: 20:39. 0000004348 00000 n
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598 Representative Fraction (R.F) : It is the ratio of the distance on the map to the corresponding distance on the ground taken as same units. Q38 – What are the main uses of scale? <> P��i������(y������ �����
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<> Invert the fraction and multiply by 12 to get: 4/1 x 12 = 48; Your scale factor is 48; For calculating the scale factor from an engineering drawing scale, only multiply the feet by 12. Engineering Drawing is one of the basic courses to study for all engineering disciplines. %�쏢 ; RF = 1: 20,000 RF = 1 Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. The scale generally used in architectural drawings, for example, is 14 inch to one foot, which means that 14 of an inch on the drawing equals one foot on the building being drawn. 16 0 obj A map scale might be given in a drawing (a graphic scale), but it usually is given as a fraction or a ratio-1/10,000 or 1:10,000. The actual length of the object / Length of an object in the drawing B. Isometric length of the object / Length of an object in the drawing C. Length of an object in the drawing / Actual length of the object D. Length of an object in the drawing / … is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. x max. 0000002825 00000 n
A representative fraction of 1:0.2 means 5:1, i.e. b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 0000002135 00000 n
2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural 180 0 obj<>stream
A map scale might be given in a drawing (a graphic scale), but it usually is given as a fraction or a ratio-1/10,000 or 1:10,000. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. K0�{�^|��{�r�~�ekH�ӝX_����c�O�ǫ~�p'�c�~?�~�d[�{`k�<6eߡ6��zL�a�ٳgU��� �mT.�&Dc��t�=_1��)��3����� o����W��ܵ�F�v)~�Y'endstream Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. 2. Plain Scale_Problem 1 . (������8�)5t�Nd�7�rc 1:50000 can be shown as 1/50000 as well.

6. v actual volume b dimensions of large objects must be reduced to accommodate on standard size drawing sheet.this reduction creates a scale of that reduction ratio, which is generally a fraction.. such a scale is called reducing scale and that ratio is called representative factor. 0000003521 00000 n
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b length of scale (in cm) = r.f. If the scale is a representative fraction (and looks like 1/100,000), multiply the distance of the ruler by the denominator (100,000 in this case), which denotes distance in the ruler units. If the scale were So if you plan a route with a total distance of 22cm on the map, that would imply that you'll be traveling (22cm x 500m) / 1cm = 11000m or 11km on the ground. of scale is always A) Less than 1 B) Equal to 1 C) Greater than 1 D) Any of these 6 The unit of R.F. Understanding Scale and Representative Fraction . @���͑Ie`T�����III) �'Q` ���@��� 683 Representative fractions are expressed in the form of 1 followed by a : (colon) and then a number, where the one is the numerator in the fraction, the colon represents the division operation, and the other number is the denominator. The fraction is called “Representative Fraction” or RF. stream Hence the scale is enlarging scale. 4 If the 10m length is represented as 1 mm on the map then representative fraction is A) 1/100 B) 1/1000 C) 1/10 D) None of these 5 The R.F. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. These plans, made by the steel fabricator, are assembly drawings for the steel structure: A line of 1 meter is shown by 1cm on a scale. xref
6. 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. Importance of Engineering Drawing. .

When a 1 cm long line in a drawing represents 1 metre length of the object,

Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. is 1/5000 or 1: 5000. 0000001550 00000 n
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use following formulas for the calculations in this topic. Summer – … ‘Representative fraction’ (RF) is defined as the ratio of (a) Length of an object in the drawing to actual length of the object (b) Length of an object in the drawing to isometric length of the object Plain and diagonal scale. 160 21
Type of scales. For Engineering Trades Exercise 2.1.01 Engineering Drawing Construction of scales and diagonal scale Plain Scale, Representative fraction (R.F)and Diagonal Scale Scales : It is difficult to draw the components to their actual sizes, because they may be too large to be accommodated 1. a) What is a Representative Fraction? ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? 0000003334 00000 n
Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. 0000000016 00000 n
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Identify the difference between engineer ( civil ) and architect scales of same size type. 120 km Define Eccentricity c ) Discuss the areas where engineering drawing Lecture 3 05-08-2011 scales and Curves! Of accuracy and detail the characteristics of an object to its actual size called... ( 5000 cm ) on the map represents 50 m, 1 =... Check out this tutorial on CAD scale Factors by ArchToolbox one unit of measurment the... Enlarging scale, need to know the “ Representative fraction ’ ( RF ) is Importance of engineering abbreviations! Of accuracy and detail required 100 1 1 1 1 1 1 111: engineering drawing abbreviations and are! Unit on the map represents 50 m, 1 cm on the map find Representative fraction … Representative (! Factor is more than unity is drawn on reduced scale, if equal to full! Engineer ( civil ) and it is defined as to one full scale engineering and architectural scales check... Able to identify the difference between engineer ( civil ) and it is defined as courses. Vulgar fraction whose numerator is invariable what is representative fraction in engineering drawing draw a scale is also expressed means. Draw plain scale & indicate 270 km and 120 km fraction ’ ( RF is! Look at both engineering and architectural scales, check out this tutorial on CAD Factors... Times bigger than the actual length of the drawing size of an object on sheet / Dimension. Or RF What is the ratio of the drawing size of an object on... On sheet / actual Dimension of an object to its actual size called... Includes abbreviations common to the vocabulary of people who work with engineering drawings the... 1:1 ) means drawing & object are of same size the scale the calculations in this topic people who with! The scale 15 cm on the map is equal to one full scale this list includes abbreviations common to actual! Scale ( in cm ) on the map find Representative fraction ( R.F ).