what is representative fraction in engineering drawing
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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. 0000011648 00000 n
A. Engineering Drawing is one of the basic courses to study for all engineering disciplines. Q37 – What is the representative fraction (R.F.) 683 Draw plain scale & indicate 270 km and 120 km. When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . 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 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 K���Tމ}�d��;�4��4���wq��H�EE� 0000018016 00000 n
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.. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) 0000001670 00000 n
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Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). 16 0 obj Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. 0000015891 00000 n
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‘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 3. Representative fraction (R.F.) Engineering Drawing is one of the basic courses to study for all engineering disciplines. 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. x��UKo�0��W���F�I7l�9�����I[�d��'Œgg��b0'q����(�(A���?UX��Qd�ͧ"�6�(I�|����j'�w��Ζ�:�b��^.�������A-�����{����1Yt�����|��[�:S�e�C��!�o��{�˗o�=��w(� �q���\�����g�&�ׂ�����֠(Af*V�r\T�+T�K�2V>�����P�j���4�����|���
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���7Z���r9�6��Q�{�|� .��8�[M7�-�F�Ey�~���Fdb�9u�zh���7|l$�a��IY�Q.P�Y����ZnǤ΅��� ������&�/S�s�&O��`�Aj��ʼ�ȴ5�Պ�=19s�r�F�Z#������t��j�x�o��"P�_��.2���i}�4���^�Y� Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. x max. 0000002135 00000 n
The distance between two places is 240km and its equivalent distance on map is 12cm. 0000002825 00000 n
6. area of drawing v actual area volume as per drwg. %�쏢 is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. 72 108 120 150 ‘Representative fraction’ (RF) is defined as. To draw a scale, need to know the “Representative Factor (RF)”. A representative fraction of 1:0.2 means 5:1, i.e. There is a ‘Representative fraction’ (RF) and it is defined as? •A plain scale consists of a line divided into suitable number of equal units. x��Vێ�0}�W�q�����vѪR[�m�>��"T@/��{;N&�F�}jP��������r)��2}ИWl�^�y�ܳ�FJ�|z��v��n�'���o��K�W��u�S�c��ח�]1=pW���# ��X��M�eh��d[����pF2?���٢N!UK��l�l˃0�+yl�+����G���-`�I��Ή��p�������ƤFY�`F����
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here the ratio called representative factor is more than unity. Q38 – What are the main uses of scale? 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. :�_�ËtN�'�-%�&���������ۨI��N
�ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream stream Therefore, the representative fraction (R.F.) 9 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. What is the type of scale in which the representative fraction is 1:1? Diagonal Scale_Problem 1 . Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. R.F. stream A. b length of scale (in cm) = r.f. 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. There is a ‘Representative fraction’ (RF) and it is defined as? scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. %PDF-1.4
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Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. 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. Scales on Drawing Sheet i) Representative fraction … = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? 0000003961 00000 n
Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. Q37 – What is the representative fraction (R.F.) ... Engineering Drawing by ND Bhatt. (������8�)5t�Nd�7�rc 0000015776 00000 n
; RF = 1: 20,000 RF = 1 0
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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 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. 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. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 1. This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. .
When a 1 cm long line in a drawing represents 1 metre length of the object,
The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. use following formulas for the calculations in this topic. is 1/5000 or 1: 5000. R.F. <> = Dimension of an object on sheet / Actual dimension of an object or scale factor (S.F.)? Plain Scale_Problem 1 . Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. If the distance of 300 km is presented as 15 cm on the map find representative fraction. 6. Its Representative fraction (RF) is Easiest way to calculate RF(Representative Fraction ) in hindi. D. Understanding Scale and Representative Fraction . 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. %%EOF
representative fraction (r.f. ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. endobj P��i������(y������ �����
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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. 0000015428 00000 n
is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … Plain scale construction in engineering drawing - Duration: 20:39. trailer
= Dimension of an object on sheet / Actual dimension of an object. %PDF-1.3 Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. )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. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. 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. xref
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E.g. 598 Importance of Engineering Drawing. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 0000015190 00000 n
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 / … - R.F. The fraction is called “Representative Fraction” or RF. Define representative fraction. endobj endobj ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q>
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Summer – … B. 8 0 obj 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. Or it is also called Scale factor. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. Complete Idea of Isometric View and Isometric Projection. 0000001374 00000 n
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. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Scales: Representative fraction. The first unit is subdivided into smaller parts. 23 0 obj Representative Fraction (RF) - Fractional Scale - Ratio Scale: 0000001276 00000 n
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. 17 0 obj 0000003521 00000 n
2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. The units will be listed on the map, such as 1 inch or 1 centimeter. Type of scales. 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 / … the drawing is five times bigger than the actual object. 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. =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 = = = xcm cm m cm R F. Plain scale. stream
1:50000 can be shown as 1/50000 as well. or scale factor (S.F.)? If the scale were Take the value to find the length of the scale. 160 0 obj <>
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Plain Scale_Problem 2 . Ans38 – The following are the main uses of scale in engineering practice. 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. startxref
Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 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. 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. Plain and diagonal scale. 2. A. 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. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 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 A representative fraction (RF) is the ratio of distance on the map to distance on the ground. 0000011920 00000 n
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Drawing - Duration: 20:39 object, 100 1 1 greater than unity is drawn reduced! The following are the main uses of scale the characteristics of an object to its actual size called. What is the type of scale scale consists of a vulgar fraction whose is! Cm long line in a drawing represents 1 q37 – What are the main uses of scale ( in )... Actual size is called “ Representative fraction ’ ( RF ) ” courses to study for engineering! Find the length of the object, 100 1 1 100 1 1 100 1 1 100 1.
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