(������8�)5t�Nd�7�rc Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 0 Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. 0000004348 00000 n 0000018016 00000 n Plain and diagonal scale. the drawing is five times bigger than the actual object. 6. When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . Plain Scale_Problem 1 . 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. 16 0 obj 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. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … Plain scale construction in engineering drawing - Duration: 20:39. 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 by ND Bhatt. area of drawing v actual area volume as per drwg. A. Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. %�쏢 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. 0000001550 00000 n 598 0000001670 00000 n 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. If the scale were 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural 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. Understanding Scale and Representative Fraction . 0000002035 00000 n R.F. To draw a scale, need to know the “Representative Factor (RF)”. <> x max. endobj 0000002825 00000 n When a 1 cm long line in a drawing represents 1 %PDF-1.3 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 0000015428 00000 n If the scale were Or it is also called Scale factor. Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. 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. 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. 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. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. R.F. Representative fraction (R.F.) Ans38 – The following are the main uses of scale in engineering practice. 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 If the distance of 300 km is presented as 15 cm on the map find representative fraction. The fraction is called “Representative Fraction” or RF. = Dimension of an object on sheet / Actual dimension of an object. Plain Scale_Problem 2 . representative fraction (r.f. ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. )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. ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction.
6. 9 0 obj 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.. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. 0000002135 00000 n trailer <> There is a ‘Representative fraction’ (RF) and it is defined as? 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. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. 17 0 obj 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. %PDF-1.4 %���� Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. E.g. 23 0 obj x��Y�r7}���GBaE��� .
When a 1 cm long line in a drawing represents 1 metre length of the object,
stream 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��; ��! Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 0000000016 00000 n A. 160 21 = Dimension of an object on sheet / Actual dimension of an object Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. The distance between two places is 240km and its equivalent distance on map is 12cm. So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. Scales: 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. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. here the ratio called representative factor is more than unity. endobj 1. This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. b length of scale (in cm) = r.f. 6. •A plain scale consists of a line divided into suitable number of equal units. Take the value to find the length of the scale. xref 0000003521 00000 n ‘Representative fraction’ (RF) is defined as the ratio of (a) Length of an object in the drawing to actual length of the object (b) Length of an object in the drawing to isometric length of the object use following formulas for the calculations in this topic. of scale is always A) Less than 1 B) Equal to 1 C) Greater than 1 D) Any of these 6 The unit of R.F. area of drawing v actual area volume as per drwg. K0�{�^|��{�r�~”�ekH�ӝX_����c�O�ǫ~�p'�c�~?�~�d[�{`k�<6eߡ6��zL�a�ٳgU��� �mT.�&Dc��t�=_1��)��3����֐� o����W��ܵ�F�v)~�Y'endstream Invert the fraction and multiply by 12 to get: 4/1 x 12 = 48; Your scale factor is 48; For calculating the scale factor from an engineering drawing scale, only multiply the feet by 12. Diagonal Scale_Problem 1 . Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. stream Scales on Drawing Sheet i) Representative fraction … 2. x�b```a``��|��������x$��"l�d�$���!�fɮ|cҽc����ׇ��s7"��c�{�gE��t�2930�1��1��:3;��֙�%|��f�e�G�"�&�6#��q�Ж�© 6X�l+PYKf[l�Q��sbA�� �90]��쒮a� �AF���T��IE = = = xcm cm m cm R F. Plain scale. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer 683 The first unit is subdivided into smaller parts. Hence the scale is enlarging scale. This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. Complete Idea of Isometric View and Isometric Projection. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 1:50000 represents the map scale as a mathematical ratio or fraction, thus the name ratio scale or fractional scale. startxref %%EOF Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. Representative Fraction (R.F) : It is the ratio of the distance on the map to the corresponding distance on the ground taken as same units. Type of scales. K���Tމ}�d��;�4��4���wq��H�EE� endobj 0000015190 00000 n is 1/5000 or 1: 5000. b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. A. 0000001374 00000 n stream Its Representative fraction (RF) is Engineering Drawing is one of the basic courses to study for all engineering disciplines. Engineering Drawing is one of the basic courses to study for all engineering disciplines. 0000000716 00000 n x��Vێ�0}�W�q�����vѪR[�m�>�؅�"T@/��{;N&�F�}jP��������r)��2}ИWl�^�y�ܳ�FJ�|z��v��n�'���o��K�W��u�S�c��ח�]1=pW���# ��X��M�eh��d[����pF2?���٢N!UK��l�l˃0�+yl�+����G���-`�I��Ή��p�������ƤFY�`F���� ��Ud�7�.�� ��Ơt1�9g�D�M�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? 0000003334 00000 n 0000015776 00000 n ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. 0000001417 00000 n 180 0 obj<>stream What is the type of scale in which the representative fraction is 1:1? 0000015891 00000 n Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 0000011920 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. - R.F. length to be measured in cm. Importance of Engineering Drawing. 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. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 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. B. =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 Representative Fraction (RF) - Fractional Scale - Ratio Scale: drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. or scale factor (S.F.)? 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 / … endobj <> C. Graphical scale : 1. a) What is a Representative Fraction? Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. Draw plain scale & indicate 270 km and 120 km. R.F. The units will be listed on the map, such as 1 inch or 1 centimeter. 3. Easiest way to calculate RF(Representative Fraction ) in hindi. ... ISOMETRIC DRAWINGS. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). 0000011648 00000 n <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> Therefore, the representative fraction (R.F.) A representative fraction of 1:0.2 means 5:1, i.e. Define representative fraction. is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full 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 / … Q38 – What are the main uses of scale? = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? Winter – 2014 (Old) 8. 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. Q37 – What is the representative fraction (R.F.) 8 0 obj Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. 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 :�_�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 ... Representative fraction (R.F.) 160 0 obj <> endobj 0000001276 00000 n or scale factor (S.F.)? There is a ‘Representative fraction’ (RF) and it is defined as? 1:50000 can be shown as 1/50000 as well. 0000003961 00000 n Summer – … ; RF = 1: 20,000 RF = 1 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� @���͑Ie`T�����III) �'Q` ���@��� Q37 – What is the representative fraction (R.F.) D. A representative fraction (RF) is the ratio of distance on the map to distance on the ground. Drawing & object are of same size represented on drawing to the vocabulary of people who work engineering... And engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039 actual Dimension of an object here the ratio Representative... 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