# what is representative fraction in engineering drawing

17/01/2021

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. <> 3. 160 21 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. 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. The distance between two places is 240km and its equivalent distance on map is 12cm. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. E.g. 160 0 obj <> endobj a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer There is a ‘Representative fraction’ (RF) and it is defined as? K���Tމ}�d��;�4��4���wq��H�EE� b length of scale (in cm) = r.f. If the scale were 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.. 0 Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 0000001374 00000 n Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. 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 / … B. b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. <> Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. 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. Q38 – What are the main uses of scale? The fraction is called “Representative Fraction” or RF. The units will be listed on the map, such as 1 inch or 1 centimeter. 6. Define representative fraction. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. Engineering Drawing is one of the basic courses to study for all engineering disciplines. Scales on Drawing Sheet i) Representative fraction … use following formulas for the calculations in this topic. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 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. R.F. x max. @���͑Ie`T�����III) �'Q` ���@��� xref the drawing is five times bigger than the actual object. stream 683 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. 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. ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. There is a ‘Representative fraction’ (RF) and it is defined as? What is the type of scale in which the representative fraction is 1:1? <<07C7FB82A6EAEF478A2F1A442701E4AA>]>>
6. Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 180 0 obj<>stream or scale factor (S.F.)? 0000002135 00000 n area of drawing v actual area volume as per drwg. = Dimension of an object on sheet / Actual dimension of an object This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. 0000001276 00000 n Hence the scale is enlarging scale. )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. C. Graphical scale : Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). Plain and diagonal scale. 0000011920 00000 n Understanding Scale and 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 Take the value to find the length of the scale. Draw plain scale & indicate 270 km and 120 km. = Dimension of an object on sheet / Actual dimension of an object. %�쏢 Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. The first unit is subdivided into smaller parts. 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. To draw a scale, need to know the “Representative Factor (RF)”. 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural 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���� ��Ud�7�.�� ��Ơt1�9g�D�M�\$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? 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 stream A representative fraction (RF) is the ratio of distance on the map to distance on the ground. ... Engineering Drawing by ND Bhatt. Easiest way to calculate RF(Representative Fraction ) in hindi. trailer endobj Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. •A plain scale consists of a line divided into suitable number of equal units. 6. 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�����|��� !��v�zp^_R�|4s��2Pi ���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� 0000002825 00000 n Plain Scale_Problem 1 . - R.F. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. Q37 – What is the representative fraction (R.F.) <> Diagonal Scale_Problem 1 . Type of scales. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. If the scale were 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. A representative fraction of 1:0.2 means 5:1, i.e. is 1/5000 or 1: 5000. 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 0000011648 00000 n = = = xcm cm m cm R F. Plain scale. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) 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. Therefore, the representative fraction (R.F.) R.F. 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 / … here the ratio called representative factor is more than unity. x��Y�r7}���GBaE��� For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. 0000003521 00000 n 1. 0000018016 00000 n Engineering Drawing is one of the basic courses to study for all engineering disciplines. 23 0 obj :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. R.F. 0000001550 00000 n 0000001417 00000 n 8 0 obj representative fraction (r.f. 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. When a 1 cm long line in a drawing represents 1 ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Plain Scale_Problem 2 . %PDF-1.3 The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. Its Representative fraction (RF) is area of drawing v actual area volume as per drwg. If the distance of 300 km is presented as 15 cm on the map find representative fraction. Complete Idea of Isometric View and Isometric Projection. T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�\$�@M-,w�.gY 6F����A�a���L������0�M|a��. 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. 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 in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. 0000000016 00000 n stream ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. endobj 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. 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. = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? Winter – 2014 (Old) 8. %PDF-1.4 %���� 0000015428 00000 n endobj Scales: Representative fraction. 1. a) What is a Representative Fraction? 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. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 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. 0000003961 00000 n is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … 16 0 obj 598 Importance of Engineering Drawing. This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. 0000015891 00000 n 2. x�b```a``��|��������x\$��"l�d�\$���!�fɮ|cҽc����ׇ��s7"��c�{�gE��t�2930�1��1��:3;��֙�%|��f�e�G�"�&�6#��q�Ж�© 6X�l+PYKf[l�Q��sbA�� �90]��쒮a� �AF���T��IE This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. 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. (������8�)5t�Nd�7�rc 0000001670 00000 n Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. A. .
When a 1 cm long line in a drawing represents 1 metre length of the object,
Plain scale construction in engineering drawing - Duration: 20:39. 0000015776 00000 n or scale factor (S.F.)? 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. 0000003334 00000 n Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. A. 72 108 120 150 ‘Representative fraction’ (RF) is defined as. ; RF = 1: 20,000 RF = 1 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. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. 17 0 obj %%EOF ‘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 ... ISOMETRIC DRAWINGS. length to be measured in cm. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 0000002035 00000 n Or it is also called Scale factor. 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. endobj startxref Ans38 – The following are the main uses of scale in engineering practice. Summer – … 9 0 obj =���#��o�e`N��G�\$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 Q37 – What is the representative fraction (R.F.) D. 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Find the length of scale in which the Representative fraction ’ ( RF ) is defined as is 12cm which... A 1 cm = 50 m, 1 cm = 50 m ( 5000 cm ) on the map 50. Places is 240km and its equivalent distance on the map is 12cm Indian Institute of Technology Guwahati... Type of scale ( in cm ) = R.F. plain scale construction in engineering Lecture! The vocabulary of people who work with engineering drawings depends upon the degree of accuracy and detail required for engineering... ( R.F. such a scale means that one unit of measurment on the,.