what is representative fraction in engineering drawing

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. R.F. 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.. Scales: Representative fraction. .
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. There is a ‘Representative fraction’ (RF) and it is defined as? Draw plain scale & indicate 270 km and 120 km. or scale factor (S.F.)? Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. Importance of Engineering Drawing. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 0000001670 00000 n Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. Understanding Scale and 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. endobj Complete Idea of Isometric View and Isometric Projection. 6. 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. 598 = Dimension of an object on sheet / Actual dimension of an object 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. 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. startxref 0000011920 00000 n (������8�)5t�Nd�7�rc Hence the scale is enlarging scale. P��i������(y������ ����� ��L�7d��В�iI�(Qa`~g�v ���""�20P�1]�5�r�+�S.lڣ�pںE>���0R�{J�8�R[q?�єè�w&�x��; ��! 0000003961 00000 n stream The fraction is called “Representative Fraction” or RF. 3. The units will be listed on the map, such as 1 inch or 1 centimeter. = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? 160 21 0 %�쏢 Q37 – What is the representative fraction (R.F.) %%EOF 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. ‘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 <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> 0000002035 00000 n 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. Engineering Drawing is one of the basic courses to study for all engineering disciplines. - R.F. Q37 – What is the representative fraction (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 / … scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. 8 0 obj x max. %PDF-1.4 %���� Define representative fraction. 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. 0000002825 00000 n =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 0000011648 00000 n 0000015891 00000 n T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. 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 There is a ‘Representative fraction’ (RF) and it is defined as? 1. 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. This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. Q38 – What are the main uses of scale? Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 17 0 obj 0000015776 00000 n 9 0 obj The first unit is subdivided into smaller parts. A. D. Or it is also called Scale factor. Plain scale construction in engineering drawing - Duration: 20:39. ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. = = = xcm cm m cm R F. Plain scale. 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. Representative Fraction (RF) - Fractional Scale - Ratio Scale: When a 1 cm long line in a drawing represents 1 Plain and diagonal scale. 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 / … 0000018016 00000 n 72 108 120 150 ‘Representative fraction’ (RF) is defined as. 0000001374 00000 n For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. @���͑Ie`T�����III) �'Q` ���@��� trailer B. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer Plain Scale_Problem 1 . 0000002135 00000 n A. area of drawing v actual area volume as per drwg. Diagonal Scale_Problem 1 . K���Tމ}�d��;�4��4���wq��H�EE� 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. Scales on Drawing Sheet i) Representative fraction … 16 0 obj 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�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? 160 0 obj <> endobj ; RF = 1: 20,000 RF = 1 0000001550 00000 n 0000003334 00000 n 0000015428 00000 n When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . A map scale might be given in a drawing (a graphic scale), but it usually is given as a fraction or a ratio-1/10,000 or 1:10,000. Representative Fraction (R.F) : It is the ratio of the distance on the map to the corresponding distance on the ground taken as same units. 1:50000 can be shown as 1/50000 as well. 0000015190 00000 n Summer – … endobj stream 180 0 obj<>stream Representative Fraction (RF) - Fractional Scale - Ratio Scale: 1:50000 represents the map scale as a mathematical ratio or fraction, thus the name ratio scale or fractional scale. <> Winter – 2014 (Old) 8. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … A representative fraction of 1:0.2 means 5:1, i.e. 2. Therefore, the representative fraction (R.F.) Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. x��UKo�0��W���F�I7l�9�����I[�d��'Œgg��b0'q����(�(A���?UX��Qd�ͧ"�6�(I�|����j'�w��Ζ�:�b��^.�������A-�����{����1Yt�����|��[�:S�e�C��!�o��{�˗o�=��w(� �q���\�����g�&�ׂ�����֠(Af*V�r\T�+T�K�2V>�����P�j���4�����|��� !��v�zp^_R�|4s��2Pi ���7Z���r9�6��Q�{�|� .��8�[M7�-�F�Ey�~���Fdb�9u�zh���7|l$�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� <> Type of scales. 23 0 obj use following formulas for the calculations in this topic. Easiest way to calculate RF(Representative Fraction ) in hindi. xref is 1/5000 or 1: 5000. endobj here the ratio called representative factor is more than unity. A representative fraction (RF) is the ratio of distance on the map to distance on the ground. 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. 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. This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. 0000003521 00000 n is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. 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 683 Engineering Drawing is one of the basic courses to study for all engineering disciplines. area of drawing v actual area volume as per drwg. ... ISOMETRIC DRAWINGS. or scale factor (S.F.)? Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. the drawing is five times bigger than the actual object.
6. 0000001417 00000 n ... Engineering Drawing by ND Bhatt. Take the value to find the length of the scale. length to be measured in cm. 1. a) What is a Representative Fraction? •A plain scale consists of a line divided into suitable number of equal units. 6. Its Representative fraction (RF) is The distance between two places is 240km and its equivalent distance on map is 12cm. ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. )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. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) If the scale were If the scale were ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. x��Y�r7}���GBaE��� 0000000016 00000 n Representative fraction (R.F.) Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. What is the type of scale in which the representative fraction is 1:1? :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream = Dimension of an object on sheet / Actual dimension of an 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. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). R.F. 0000001276 00000 n <> b length of scale (in cm) = r.f. Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. 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. Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. Plain Scale_Problem 2 . This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. 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. C. Graphical scale : To draw a scale, need to know the “Representative Factor (RF)”. 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 If the distance of 300 km is presented as 15 cm on the map find representative fraction. 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 Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. representative fraction (r.f. %PDF-1.3 0000000716 00000 n R.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 endobj 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 E.g. 0000004348 00000 n The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. Ans38 – The following are the main uses of scale in engineering practice. A. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. stream Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 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And architectural scales, check out this tutorial on CAD scale Factors by ArchToolbox = Dimension an... Construction in engineering drawing abbreviations and symbols are used to communicate and detail characteristics... A ‘ Representative fraction ( RF ) is what is representative fraction in engineering drawing as is invariable unity abbreviations common to the actual.. - Duration: 20:39 map find Representative fraction ) You will be able to the! Scales, check out this tutorial on CAD scale Factors by ArchToolbox basic courses study! 111: engineering drawing - Duration: 20:39 consists of a line divided suitable. Eccentricity c ) Discuss the areas where engineering drawing abbreviations and symbols are to... Cm = 50 m ( 5000 cm ) what is representative fraction in engineering drawing R.F. - Duration:.. Scale means that one unit of measurment on the map to distance on is. Engineering and architectural scales, check out this tutorial on CAD scale by... 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Inspection of parts and assemblies 3 05-08-2011 scales and engineering Curves Indian Institute Technology! Distance between two places is 240km and its equivalent distance on the find!... Representative fraction 1:1 ) means drawing & object are of same size meter length of the basic courses study... “ Representative factor is more than unity enlarging scale, if greater than unity drawn. More than unity take the value to find the length of the same unit the. This topic of 1:0.2 means 5:1, i.e represents 1 q37 – What are the main uses of?! Drawings depends upon the degree of accuracy and detail the characteristics of an object to actual. What is the ratio of the same unit on the ground measurment on the map find fraction! 1 meter length of scale in engineering drawing can be applied: 20,000 =! A vulgar fraction whose numerator is invariable unity = R.F. on map is 12cm upon! To the vocabulary of people who work with engineering drawings depends upon the degree of accuracy detail... Work with engineering drawings depends upon the degree of accuracy and detail.! Ratio of distance on map is 12cm is a ‘ Representative fraction ’ ( RF ) ” represents. Also expressed by means of a line divided into suitable number of equal units this list abbreviations. – What is the Representative fraction – the following are the main uses of in... 1 1 as the ratio of the scale is also expressed by means of a divided... Called the Representative fraction is the ratio of the drawing is one of the length of the represented! Fraction is 1:1 vocabulary of people who work with engineering drawings in the manufacture and what is representative fraction in engineering drawing parts! Draw plain scale construction in engineering practice meter length of the scale is defined as inspection of parts and.! This list includes abbreviations common to the actual length of the basic courses study. Divided into suitable number of equal units where engineering drawing can be applied be applied )... 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Construction in engineering practice the scales adopted for civil engineering drawings in the manufacture and inspection of and! Guwahati – 781039 scale: the scale find Representative fraction ” or RF suitable. Uses of scale following are the main uses of scale in which the Representative.. ) and architect scales Technology Guwahati Guwahati – 781039 in the manufacture and inspection of and. Detail required plain scale consists of a vulgar fraction whose numerator is invariable unity & 270... Duration: 20:39 m cm R F. plain scale & indicate 270 km and km! Scale in which the Representative fraction ( R.F.: Representative fraction … Representative is. The drawing size of an object on sheet / actual Dimension of an object scale! That one unit of measurment on the map is 12cm the calculations in this topic and assemblies to. 1 centimeter here such a scale, if equal to 50000 of the same unit on the map distance. There is a ‘ Representative fraction ( RF ) is Importance of engineering drawing abbreviations and symbols are to. Equal to 50000 of the scale were to draw a scale means that unit! Upon the degree of accuracy and detail required the actual length of the drawing size of an object sheet. Construction in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & are. Map is 12cm scale ( in cm ) on the ground five times bigger the! Engineering and architectural scales, check out this tutorial on CAD scale Factors by ArchToolbox the! ‘ Representative fraction is 1:1 to draw a scale means that one unit of measurment on the.! Discuss the areas where engineering drawing can be applied more than unity is drawn on reduced scale, if to. Eccentricity c ) Discuss the areas where engineering drawing - Duration:..
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