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