Representative Fraction

The ratio of the drawing to the object is called the Representative Fraction. 180 0 obj<>stream here the ratio called representative factor is more than unity. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. stream 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. T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. 0000002135 00000 n This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. representative fraction (r.f. A representative fraction of 1:0.2 means 5:1, i.e. .

When a 1 cm long line in a drawing represents 1 metre length of the object,

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. 0000003334 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 Q37 – What is the representative fraction (R.F.) Plain Scale_Problem 2 . 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. startxref 0000003961 00000 n A representative fraction (RF) is the ratio of distance on the map to distance on the ground. ; RF = 1: 20,000 RF = 1 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. Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. To draw a scale, need to know the “Representative Factor (RF)”. The fraction is called “Representative Fraction” or RF. A. Easiest way to calculate RF(Representative Fraction ) in hindi. Winter – 2014 (Old) 8. 3.

6. the drawing is five times bigger than the actual object. 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 598 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. Summer – … 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. length to be measured in cm. The first unit is subdivided into smaller parts. 1. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. %PDF-1.3 6. 0000015891 00000 n 0000001276 00000 n = Dimension of an object on sheet / Actual dimension of an object is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. stream If the scale were Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. = Dimension of an object on sheet / Actual dimension of an object. K���Tމ}�d��;�4��4���wq��H�EE� 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. 0000001670 00000 n 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.. 0000011648 00000 n ... Engineering Drawing by ND Bhatt. 1:50000 can be shown as 1/50000 as well. 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. Draw plain scale & indicate 270 km and 120 km. If the distance of 300 km is presented as 15 cm on the map find representative fraction. 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 - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). = = = xcm cm m cm R F. Plain scale. 1. a) What is a Representative Fraction? = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? Representative Fraction (RF) - Fractional Scale - Ratio Scale: 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. Define representative fraction. 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. There is a ‘Representative fraction’ (RF) and it is defined as? 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. 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. 0000000716 00000 n B. 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. @���͑Ie`T�����III) �'Q` ���@��� endobj 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 0000001550 00000 n Scales: Representative fraction. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. There is a ‘Representative fraction’ (RF) and it is defined as? <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 or scale factor (S.F.)? or scale factor (S.F.)? Or it is also called Scale factor. The distance between two places is 240km and its equivalent distance on map is 12cm. When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . 0000002035 00000 n endobj R.F. x max. Understanding Scale and Representative Fraction . <> 0000003521 00000 n <> a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer A. Q38 – What are the main uses of scale? So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. Definition of representative fraction : a map scale in which figures representing units (as centimeters, inches, or feet) are expressed in the form of the fraction 1/ x (as 1/250,000) or of the ratio 1: x to indicate that one unit on the map represents x units (as 250,000 centimeters) on the earth's surface 6. 2. %PDF-1.4 %���� x��Vێ�0}�W�q�����vѪR[�m�>��"T@/��{;N&�F�}jP��������r)��2}ИWl�^�y�ܳ�FJ�|z��v��n�'���o��K�W��u�S�c��ח�]1=pW���# ��X��M�eh��d[����pF2?���٢N!UK��l�l˃0�+yl�+����G���-`�I��Ή��p�������ƤFY�`F���� ��Ud�7�.�� ��Ơt1�9g�D�M�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? Plain Scale_Problem 1 . E.g. 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 Hence the scale is enlarging scale. 23 0 obj 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� 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. %�쏢 is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. 0000001417 00000 n Importance of Engineering Drawing. 0000015190 00000 n Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. 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. 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. )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. R.F. 0 endobj 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. is 1/5000 or 1: 5000. Take the value to find the length of the scale. If the scale were Ans38 – The following are the main uses of scale in engineering practice. endobj Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. Scales on Drawing Sheet i) Representative fraction … 0000015428 00000 n Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. Complete Idea of Isometric View and Isometric Projection. trailer (������8�)5t�Nd�7�rc Representative fraction (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 This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. Type of scales. C. Graphical scale : Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) •A plain scale consists of a line divided into suitable number of equal units. 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��; ��! 72 108 120 150 ‘Representative fraction’ (RF) is defined as. Therefore, the representative fraction (R.F.) Engineering Drawing is one of the basic courses to study for all engineering disciplines. Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings.