0000015190 00000 n endobj %�쏢 This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. There is a ‘Representative fraction’ (RF) and it is defined as? A representative fraction of 1:0.2 means 5:1, i.e. 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 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. 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. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. Complete Idea of Isometric View and Isometric Projection. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. E.g. 1. a) What is a Representative Fraction? R.F. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. 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. 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 The first unit is subdivided into smaller parts. 1:50000 can be shown as 1/50000 as well. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. = Dimension of an object on sheet / Actual dimension of an object 72 108 120 150 ‘Representative fraction’ (RF) is defined as. 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 (R.F) : It is the ratio of the distance on the map to the corresponding distance on the ground taken as same units. = Dimension of an object on sheet / Actual dimension of an object. B. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 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 / … Q37 – What is the representative fraction (R.F.) 8 0 obj ... ISOMETRIC DRAWINGS. 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��; ��! Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. %%EOF 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. 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 length of scale (in cm) = r.f. or scale factor (S.F.)? )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. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. 0000000716 00000 n <> Hence the scale is enlarging scale. is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full scale. Representative fraction (R.F.) stream Type of scales. There is a ‘Representative fraction’ (RF) and it is defined as? Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? 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 stream 0000011648 00000 n 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.. A representative fraction (RF) is the ratio of distance on the map to distance on the ground. length to be measured in cm. 0000015776 00000 n 0000003521 00000 n Easiest way to calculate RF(Representative Fraction ) in hindi. 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. = = = xcm cm m cm R F. Plain 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. x max. R.F. the drawing is five times bigger than the actual object. 1. use following formulas for the calculations in this topic. Therefore, the representative fraction (R.F.) 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. Its Representative fraction (RF) is Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. 0000003334 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�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? 0000004348 00000 n ; RF = 1: 20,000 RF = 1 endobj Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. The fraction is called “Representative Fraction” or RF. Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. Draw plain scale & indicate 270 km and 120 km. Engineering Drawing is one of the basic courses to study for all engineering disciplines. K���Tމ}�d��;�4��4���wq��H�EE� 0 Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. A. 0000001276 00000 n Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. 4 If the 10m length is represented as 1 mm on the map then representative fraction is A) 1/100 B) 1/1000 C) 1/10 D) None of these 5 The R.F. 0000000016 00000 n Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. of scale is always A) Less than 1 B) Equal to 1 C) Greater than 1 D) Any of these 6 The unit of R.F. =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 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. here the ratio called representative factor is more than unity. 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. Scales: Representative fraction. Understanding Scale and Representative Fraction . Diagonal Scale_Problem 1 . So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. 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 <> Q37 – What is the representative fraction (R.F.) 0000002825 00000 n 160 21 R.F. When a 1 cm long line in a drawing represents 1 area of drawing v actual area volume as per drwg. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox.
6. :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream stream Q38 – What are the main uses of scale? 0000003961 00000 n xref trailer representative fraction (r.f. What is the type of scale in which the representative fraction is 1:1? Or it is also called Scale factor. 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 <> startxref 16 0 obj Plain Scale_Problem 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. The distance between two places is 240km and its equivalent distance on map is 12cm. 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. C. Graphical scale : 0000015428 00000 n Winter – 2014 (Old) 8. Ans38 – The following are the main uses of scale in engineering practice. 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural 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. is 1/5000 or 1: 5000. area of drawing v actual area volume as per drwg. Plain Scale_Problem 2 . Importance of Engineering Drawing. 3. 23 0 obj 6. If the scale were Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. 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 distance of 300 km is presented as 15 cm on the map find representative fraction. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. .
When a 1 cm long line in a drawing represents 1 metre length of the object,
0000011920 00000 n <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 2. 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$�a��IY�Q.P�Y����ZnǤ΅��� ������&�/S�s�&O��`�Aj��ʼ�ȴ5�Պ�=19s�r�F�Z#������t��j�x�o��"P�_��.2���i}�4���^�Y� x��Y�r7}���GBaE��� Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 0000002135 00000 n @���͑Ie`T�����III) �'Q` ���@��� b) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. 0000001417 00000 n D. 0000001550 00000 n %PDF-1.4 %���� 598 T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. endobj scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) The units will be listed on the map, such as 1 inch or 1 centimeter. 6. A. •A plain scale consists of a line divided into suitable number of equal units. 0000002035 00000 n 180 0 obj<>stream ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. If the scale were 0000015891 00000 n Define 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 Summer – … 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 / … Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 0000001374 00000 n ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. 683 or scale factor (S.F.)? 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. Take the value to find the length of the scale. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the 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 (������8�)5t�Nd�7�rc The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. Plain and diagonal scale. 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. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. 0000018016 00000 n 9 0 obj 0000001670 00000 n 17 0 obj a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer Plain scale construction in engineering drawing - Duration: 20:39. %PDF-1.3 endobj To draw a scale, need to know the “Representative Factor (RF)”. Engineering Drawing is one of the basic courses to study for all engineering disciplines. ... Engineering Drawing by ND Bhatt. Scales on Drawing Sheet i) Representative fraction … is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … A. -The ratio of the length of the drawing size of an object on sheet actual! Of engineering drawing can be applied the calculations in this topic on map. To distance on the map find Representative fraction ( R.F. scale Factors by ArchToolbox the represented... 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