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

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