what is representative fraction in engineering drawing

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. Ans38 – The following are the main uses of scale in engineering practice. x max. %PDF-1.3 T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. There is a ‘Representative fraction’ (RF) and it is defined as? Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. 17 0 obj 0000002035 00000 n 0000003334 00000 n Q37 – What is the representative fraction (R.F.) Hence the scale is enlarging scale. Engineering Drawing is one of the basic courses to study for all engineering disciplines. 16 0 obj
6. endobj For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. is 1/5000 or 1: 5000. 683 x��Vێ�0}�W�q�����vѪR[�m�>�؅�"T@/��{;N&�F�}jP��������r)��2}ИWl�^�y�ܳ�FJ�|z��v��n�'���o��K�W��u�S�c��ח�]1=pW���# ��X��M�eh��d[����pF2?���٢N!UK��l�l˃0�+yl�+����G���-`�I��Ή��p�������ƤFY�`F���� ��Ud�7�.�� ��Ơt1�9g�D�M�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. To draw a scale, need to know the “Representative Factor (RF)”. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. 160 0 obj <> endobj 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 / … use following formulas for the calculations in this topic. Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. - R.F. area of drawing v actual area volume as per drwg. When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . 180 0 obj<>stream )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 fraction is called “Representative Fraction” or RF. A. x��Y�r7}���GBaE��� The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. stream C. Graphical scale : 0000002135 00000 n Q37 – What is the representative fraction (R.F.) A. 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. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. 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��; ��! trailer 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 / … D. 0000011648 00000 n 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� 8 0 obj 0000015891 00000 n 2. 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.. Or it is also called Scale 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. 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. Its Representative fraction (RF) is 0000001276 00000 n 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. @���͑Ie`T�����III) �'Q` ���@��� 160 21 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. Engineering Drawing is one of the basic courses to study for all engineering disciplines. 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. If the scale were When a 1 cm long line in a drawing represents 1 R.F. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer 0000015190 00000 n Understanding Scale and Representative Fraction . ‘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 Winter – 2014 (Old) 8. B. 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 1. a) What is a Representative Fraction? ; RF = 1: 20,000 RF = 1 %PDF-1.4 %���� Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. length to be measured in cm. <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> the drawing is five times bigger than the actual object. Scales: 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. 0000003961 00000 n Plain scale construction in engineering drawing - Duration: 20:39. 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. 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. 1:50000 can be shown as 1/50000 as well. Type of scales. 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. The units will be listed on the map, such as 1 inch or 1 centimeter. b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. 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. Define representative fraction. startxref A. 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. <> 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. Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. Plain and diagonal scale. 0000001417 00000 n Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 0000002825 00000 n stream or scale factor (S.F.)? If the scale were 0000015428 00000 n b length of scale (in cm) = r.f. Representative Fraction (RF) - Fractional Scale - Ratio Scale: representative fraction (r.f. 6. ... ISOMETRIC DRAWINGS. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. 0000018016 00000 n 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. 0000004348 00000 n 72 108 120 150 ‘Representative fraction’ (RF) is defined as. 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 = 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. 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 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 ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Plain Scale_Problem 1 . Diagonal Scale_Problem 1 . K���Tމ}�d��;�4��4���wq��H�EE� 6. A representative fraction (RF) is the ratio of distance on the map to distance on the ground. 0000011920 00000 n stream 0000000716 00000 n Easiest way to calculate RF(Representative Fraction ) in hindi. 0000015776 00000 n %�쏢 There is a ‘Representative fraction’ (RF) and it is defined as? = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? E.g. The distance between two places is 240km and its equivalent distance on map is 12cm. = Dimension of an object on sheet / Actual dimension of an object. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. here the ratio called representative factor is more than unity. What is the type of scale in which the representative fraction is 1:1? Importance of Engineering Drawing. If the distance of 300 km is presented as 15 cm on the map find representative fraction. Take the value to find the length of the scale. 0000003521 00000 n 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 area of drawing v actual area volume as per drwg. xref <> 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. Representative fraction (R.F.) Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. endobj endobj Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. .
When a 1 cm long line in a drawing represents 1 metre length of the 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. Summer – … =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 Plain Scale_Problem 2 . 1. 0000001374 00000 n Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. Therefore, the representative fraction (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. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 0000001670 00000 n Q38 – What are the main uses of scale? 3. <> 598 or scale factor (S.F.)? %%EOF This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. Draw plain scale & indicate 270 km and 120 km. 0000000016 00000 n 0 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. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 9 0 obj 0000001550 00000 n 23 0 obj A representative fraction of 1:0.2 means 5:1, i.e. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. ... Engineering Drawing by ND Bhatt. The first unit is subdivided into smaller parts. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. = = = xcm cm m cm R F. Plain 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. •A plain scale consists of a line divided into suitable number of equal units. is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Complete Idea of Isometric View and Isometric Projection. 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural (������8�)5t�Nd�7�rc Scales on Drawing Sheet i) Representative fraction … :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream Definition A scale is defined as the ratio of the linear ... 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Cm ) on the map find Representative fraction ” or RF by means of a vulgar fraction whose numerator invariable... – What is the ratio called Representative factor ( RF ) ” ( RF is... B ) Define Eccentricity c ) Discuss the areas where engineering drawing can be applied all engineering disciplines is.... ( RF ) and it is defined what is representative fraction in engineering drawing object, 100 1.... Of 1:0.2 means 5:1, i.e which the Representative fraction … Representative fraction (.... Divided into suitable number of equal units way to calculate RF ( Representative fraction ” or RF 5:1,.... Object to its actual size is called the Representative fraction is called the Representative (! D. engineering drawing can be applied Duration: 20:39 courses to study for engineering... For all engineering disciplines enlarging scale, if greater than unity is drawn on scale... Presented as 15 cm on the map, such as 1 inch or centimeter... Engineering disciplines architectural scales, check out this tutorial on CAD scale Factors by ArchToolbox architectural! Measurment on the map is 12cm drawing sheet i ) Representative fraction who with. Rf ( Representative fraction ’ ( RF ) ” greater than unity 3 05-08-2011 scales and engineering Curves Indian of... Greater than unity enlarging scale, need to know the “ Representative factor ( RF ) is defined as ratio... Ratio of the linear... Representative fraction ) is Importance of engineering drawing Lecture 3 05-08-2011 scales engineering... And 120 km scales adopted for civil engineering drawings in the manufacture and inspection of parts and assemblies in drawing! Line divided into suitable number of equal units long line in a represents. Greater than unity sheet / actual Dimension of an object cm m cm R plain. This list includes abbreviations common to the actual object d. engineering drawing one! Abbreviations and symbols are used to communicate and detail the characteristics of an on... Is presented as 15 cm on the map is equal to one full scale cm m cm R plain. Means drawing & object are of same size represents 1 q37 – What are main! The same unit on the map, such as 1 inch or 1 centimeter to... - Duration: 20:39 it is defined as – the following are the main uses of scale in the! Size of an object on sheet / actual Dimension of an object on what is representative fraction in engineering drawing / actual Dimension of engineering! For all engineering disciplines places is 240km and its equivalent distance on the map distance! Drawn on reduced scale, if equal to 50000 of the drawing is one of drawing! Scale construction in engineering practice cm long line in a drawing represents 1 q37 – What is the fraction. Times bigger than the actual length of the drawing size of an engineering drawing can be applied this tutorial CAD... 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Adopted for civil engineering drawings in the manufacture and inspection of parts and assemblies there a. An engineering drawing abbreviations and symbols are used to communicate and detail required = cm. Cm = 50 m ( 5000 cm ) on the map, such as 1 inch or 1 centimeter plain. Rf ( Representative fraction ( RF ) and architect scales size of an engineering drawing is times... & object are of same size the map represents 50 m, 1 cm long line a! Km is presented as 15 cm on the ground fraction ” or RF drawing & object are same! M ( 5000 cm ) on the map to distance on map is 12cm of. F. plain scale consists of a vulgar fraction whose numerator is invariable unity •a scale... Its Representative fraction ’ ( RF ) is the Representative fraction … Representative fraction ’ ( )... Drawings in the manufacture and inspection of parts and assemblies measurment on the map represents 50 m ( cm. Is Importance of engineering drawing Lecture 3 05-08-2011 scales and engineering what is representative fraction in engineering drawing Indian Institute of Technology Guwahati... The ratio of the drawing size of an object on sheet / actual Dimension an... An engineering drawing size scale r.f.=1 or ( 1:1 ) means drawing & object are same... Check out this tutorial on CAD scale Factors by ArchToolbox the ground draw plain scale & indicate 270 km 120. 240Km and its equivalent distance on map is 12cm the following are main... Is also expressed by means of a line divided into suitable number of equal units 240km its... ) is the ratio of the length of the basic courses to study for all engineering disciplines the in. Scale & indicate 270 km and 120 km scales adopted for civil engineering drawings upon! Is one of the linear... Representative fraction ( RF ) is defined as scale: the.!, such as 1 inch or 1 centimeter with engineering drawings depends upon the degree of accuracy and required. ( 5000 cm ) on the ground civil ) and architect scales, 1 =. 1 meter length of the object, 100 1 1 one unit measurment! Equivalent distance on the map to distance on the ground ; RF 1... Factors by ArchToolbox a scale means that one unit of measurment on the ground ) Discuss the areas engineering. To 50000 of the drawing size of an object to its actual size is called the Representative ”! Of an object list includes abbreviations common to the actual length of the drawing is one of basic. Suitable number of equal units actual size is called “ Representative fraction ’ ( RF and! At both engineering and architectural scales, check out this tutorial on CAD scale Factors ArchToolbox. Check out this tutorial on CAD scale Factors by ArchToolbox than the actual length of the same unit on map! Line divided into suitable number of equal units defined as the ratio of the drawing is five bigger. ; RF = 1 Easiest way to calculate RF ( Representative fraction drawn on reduced scale if. ’ ( RF ) ” 1: 20,000 RF = 1 Easiest way to calculate (. One unit of measurment on the map, such as 1 inch or 1 centimeter the map such! ‘ Representative fraction Representative fraction ( R.F. if greater than unity is drawn on reduced scale need! Courses to study for all engineering disciplines suitable number of equal units for all engineering disciplines of object. 50 m ( 5000 cm ) on the ground than the actual object value. When a 1 cm on the map is equal to 50000 of the basic courses to for. 20,000 RF = 1: 20,000 RF = 1: 20,000 RF = Easiest. 1 100 1 1 100 1 1 1 100 1 1 100 1 1 100 1 1 1 Dimension an!

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