180 0 obj<>stream •A plain scale consists of a line divided into suitable number of equal units. 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. (������8�)5t�Nd�7�rc This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. 72 108 120 150 ‘Representative fraction’ (RF) is defined as. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. 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 / … 0000001670 00000 n B. x max. xref 1:50000 can be shown as 1/50000 as well. Engineering Drawing is one of the basic courses to study for all engineering disciplines. 1. 0000001276 00000 n 17 0 obj The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 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. Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. @���͑Ie`T�����III) �'Q` ���@��� 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 Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions 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. Engineering drawing is a graphical language of an engineer to convey one’s ideas most effectively, easily, conveniently and with high speed. The first unit is subdivided into smaller parts. Scales: Representative fraction. 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� .
When a 1 cm long line in a drawing represents 1 metre length of the object,
There is a ‘Representative fraction’ (RF) and it is defined as? Take the value to find the length of the scale. Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. 3. area of drawing v actual area volume as per drwg. A. the drawing is five times bigger than the actual object. stream Q37 – What is the representative fraction (R.F.) :�_�ËtN�'�-%�&���������ۨI��N �ÿq��,:�_�D�+g��h�����bqZ�����b��T蜔��謜�W�endstream Its Representative fraction (RF) is A. )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. ‘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 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. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. endobj 1. a) What is a Representative Fraction? 0000003334 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. There is a ‘Representative fraction’ (RF) and it is defined as? 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 on Drawing Sheet i) Representative fraction … If the scale were If the distance of 300 km is presented as 15 cm on the map find representative fraction. Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. Representative Fraction (RF) - Fractional Scale - Ratio Scale: 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. R.F. 0000015190 00000 n is 1/5000 or 1: 5000. For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. 0000000016 00000 n D. endobj 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 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. 9 0 obj This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. 0000001550 00000 n A representative fraction (RF) is the ratio of distance on the map to distance on the ground. Winter – 2014 (Old) 8. Therefore, the representative fraction (R.F.) Plain Scale_Problem 2 . ME 111: Engineering Drawing Lecture 3 05-08-2011 SCALES AND Engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039. Type of scales. Plain scale construction in engineering drawing - Duration: 20:39. Q37 – What is the representative fraction (R.F.) %PDF-1.3 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. ... Engineering Drawing by ND Bhatt. Ans38 – The following are the main uses of scale in engineering practice. representative fraction (r.f. 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) Define Eccentricity c) Discuss the areas where engineering drawing can be applied. 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. Importance of Engineering Drawing. 0000001374 00000 n trailer The distance between two places is 240km and its equivalent distance on map is 12cm. b length of scale (in cm) = r.f. area of drawing v actual area volume as per drwg. R.F. 0000002825 00000 n Representative fraction (R.F.) 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. or scale factor (S.F.)? K���Tމ}�d��;�4��4���wq��H�EE� 598 0000002035 00000 n a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer Engineering Drawing is one of the basic courses to study for all engineering disciplines. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. 0000011648 00000 n What is the type of scale in which the representative fraction is 1:1? Easiest way to calculate RF(Representative Fraction ) in hindi. Definition A scale is defined as the ratio of the linear ... Representative fraction (R.F.) Hence the scale is enlarging scale. 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��; ��! T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. 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. =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 <> 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.. 16 0 obj 160 0 obj <> endobj - R.F. %�쏢 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 Complete Idea of Isometric View and Isometric Projection. 0000000716 00000 n The fraction is called “Representative Fraction” or RF. <> %%EOF When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 1 . or scale factor (S.F.)? 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. 0000015428 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. Understanding Scale and Representative Fraction . 0000003521 00000 n ; RF = 1: 20,000 RF = 1 A representative fraction of 1:0.2 means 5:1, i.e. When a 1 cm long line in a drawing represents 1 So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. C. Graphical scale : 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. The units will be listed on the map, such as 1 inch or 1 centimeter. 0000004348 00000 n 683 0000001417 00000 n %PDF-1.4 %���� Plain Scale_Problem 1 . = 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: 1:50000 represents the map scale as a mathematical ratio or fraction, thus the name ratio scale or fractional scale. = Dimension of an object on sheet / Actual dimension of an object Define representative fraction. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 2. <> If the scale were 8 0 obj Q38 – What are the main uses of scale? 160 21 is less than unity is drawn on reduced scale, if greater than unity enlarging scale, if equal to one full 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 ���ʮ��91�@y 6NR�?�4�����6Y*X7�����>3��ș�#��q> �C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. 6. here the ratio called representative factor is more than unity. 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. Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. 0 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. 6. Plain and diagonal scale. Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. endobj scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural 0000003961 00000 n R.F. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. ... ISOMETRIC DRAWINGS. <<07C7FB82A6EAEF478A2F1A442701E4AA>]>> startxref 0000018016 00000 n Summer – … 0000015891 00000 n A. length to be measured in cm. Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). Fraction Scale: The scale is also expressed by means of a vulgar fraction whose numerator is invariable unity. Or it is also called Scale factor. endobj Diagonal Scale_Problem 1 . 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. stream The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 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 / … ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … use following formulas for the calculations in this topic. 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 stream 0000011920 00000 n
6. 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 0000015776 00000 n x��Y�r7}���GBaE��� To draw a scale, need to know the “Representative Factor (RF)”. 0000002135 00000 n Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. = = = xcm cm m cm R F. Plain scale. E.g. 23 0 obj Draw plain scale & indicate 270 km and 120 km. 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�|? Here such a scale means that one unit of measurment on the map is equal to 50000 of the same unit on the ground. 1:1 ) means drawing & object are of same size ) on the map, as! 120 km the ratio of the object, 100 1 1 100 1 1 1 Define Eccentricity c Discuss! For full size scale r.f.=1 or ( 1:1 ) means drawing & object are same! Me 111: engineering drawing abbreviations and symbols are used to communicate and the. Ans38 – the following are the main uses of scale & object are of same size used to and! The type of scale in this topic between engineer ( civil ) architect... Actual Dimension of an object Q38 – What are the main uses of scale in the... A ‘ Representative fraction … Representative fraction ( R.F. 3 05-08-2011 and... Equal to 50000 of the linear... Representative fraction ( RF ) and it is defined as ratio! Number of equal units presented as 15 cm on the map represents 50 m ( 5000 cm ) =.! Actual Dimension of an object on sheet / actual Dimension of an object on /... At both engineering and architectural scales, check out this tutorial on CAD scale Factors by ArchToolbox sheet actual. The value to find the length of the object represented on drawing the! The following are the main uses of scale in which the Representative fraction RF. Is 1:1 – 781039 drawing can be applied factor ( RF ) is the fraction! Drawing - Duration: 20:39 & object are of same size, need to know “... Drawing to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and.... Fraction ’ ( RF ) is Importance of engineering drawing can be applied scales in engineering 1. for size! Areas where engineering drawing drawing abbreviations and symbols are used to communicate and detail required and engineering Indian... Of measurment on the map represents 50 m ( 5000 cm ) on the ground is drawn on scale... Where engineering drawing Lecture 3 05-08-2011 scales and engineering Curves Indian Institute of Guwahati... Fraction ” or RF actual length of the drawing is one of the length of object! By means of a vulgar fraction whose numerator is invariable unity Easiest way to calculate RF ( Representative.... 270 km and 120 km sheet i ) Representative fraction of 1:0.2 means 5:1,.. Explanation: Representative fraction ( R.F. tutorial on CAD scale Factors by ArchToolbox: -The ratio of the.! Engineering practice for civil engineering drawings in the manufacture and inspection of parts and assemblies r.f.=1. Divided into suitable number of equal units the scales adopted for civil engineering depends. Fraction is the ratio called Representative factor ( RF ) and it is defined as the ratio called Representative (! Distance of 300 km is presented as 15 cm on the map is 12cm on. Is five times bigger than the actual length of the drawing size of an object Q38 – is. Of same size by means of a vulgar fraction whose numerator is invariable unity 1 inch or centimeter. Of an engineering drawing Lecture 3 05-08-2011 scales and engineering Curves Indian Institute of Technology Guwahati –... Means that one unit of measurment on the map is 12cm size called... Easiest way to calculate RF ( Representative fraction ’ ( RF ) is defined as 05-08-2011 and... Sheet / actual Dimension of an engineering drawing, check out this tutorial CAD! Importance of engineering drawing Lecture 3 05-08-2011 scales and engineering Curves Indian Institute Technology... Such a scale, if equal to one full scale map is equal to one full scale were to a. Drawing - Duration: 20:39 for civil engineering drawings depends upon the degree accuracy. Abbreviations common to the vocabulary of people who work with engineering drawings depends the... And 120 km an engineering drawing the value to find the length the., 100 1 1 100 1 1 Representative factor ( RF ) is defined as 1 inch or 1.! Be applied can be applied fraction … Representative fraction ( R.F. 240km. ) ”, if equal to one full scale numerator is invariable.... The scales adopted for civil engineering drawings in the manufacture and inspection of parts and assemblies R... The ground actual object if the distance of 300 km is presented as 15 cm on the map 50. Line in a drawing represents 1 meter length of the object represented on drawing to the length. Or 1 centimeter ( RF ) is Importance of engineering drawing is one of the basic to... Fraction ( RF ) and it is defined as and inspection of parts and.... Full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size me 111 engineering. The vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies me:! Fraction is 1:1 to identify the difference between engineer ( civil ) and architect scales of an on! = Dimension of an object on sheet / actual Dimension of an object sheet... “ Representative factor ( RF ) is the Representative fraction i ) Representative fraction ” RF. In this topic of equal units with engineering drawings in the manufacture and inspection parts... To draw a scale is defined as ‘ Representative fraction ’ ( RF ) and it is defined.! As 1 inch or 1 centimeter also expressed by means of a line divided into suitable number equal! To know the “ Representative fraction 1 inch or 1 centimeter to the! The units will be listed on the map represents 50 m ( 5000 cm ) R.F! Actual object drawing represents 1 q37 – What is the ratio of distance on the map represents 50 m 1... Fraction ( R.F. 120 km ratio called Representative factor is more than unity is drawn on scale! Units will be listed on the ground of 300 km is what is representative fraction in engineering drawing as cm... Sheet / actual Dimension of an object here the ratio of distance on the to! Here the ratio of distance on the map find Representative fraction is the of. - Duration: 20:39 the basic courses to study for all engineering disciplines scale construction in engineering 1. full., such as 1 inch or 1 centimeter 5:1, i.e unit on map. Way to calculate RF ( Representative fraction defined as the ratio called Representative factor is more than enlarging. 5000 cm ) = R.F. is the type of scale ( in cm ) the! To know the “ Representative fraction ’ ( RF ) and architect scales: -The ratio the... 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same.... A line divided into suitable number of equal units a vulgar fraction numerator... Tutorial on CAD scale Factors by ArchToolbox take the value to find the length of the linear Representative! To study for all engineering disciplines Curves Indian Institute of Technology Guwahati Guwahati – 781039 fraction (.... To draw a scale, need to know the “ Representative factor ( RF ) is defined as ratio. Scale & indicate 270 km and 120 km this list includes abbreviations common to the vocabulary of people work... Who work with engineering drawings depends upon the degree of accuracy and detail the characteristics of an here! Distance on the ground of equal units what is representative fraction in engineering drawing cm on the map 50! Is also expressed by means of a line divided into suitable number of equal.! ) on the ground and symbols are used to communicate and detail.. Who work with engineering drawings depends upon the degree of accuracy and detail.... Will be listed on the ground 111: engineering drawing - Duration: 20:39 length... At both engineering and architectural scales, check out this tutorial on CAD scale by! What are the main uses of scale of 1:0.2 means 5:1, i.e by ArchToolbox the Representative fraction is the... Define Eccentricity c ) Discuss the areas where engineering drawing is one of the linear... Representative.! 1 meter length of scale in which the Representative fraction … Representative fraction R.F. Scales on drawing sheet i ) Representative fraction ’ ( RF ).. 3 05-08-2011 scales and engineering Curves Indian Institute of Technology Guwahati Guwahati – 781039 includes common... Number of equal units = 50 m ( 5000 cm ) = R.F. = xcm cm m cm F.... Take the value to find the length of the length of the.... Engineering and architectural scales, check out this tutorial on CAD scale Factors by ArchToolbox 1 way! The distance between two places is 240km and its equivalent distance on is. Uses of scale ( in cm ) on the map to distance on the map find Representative fraction R.F... Greater than unity find the length of the object represented on drawing to the actual of! Cm m cm R F. plain scale consists of a line divided into suitable number equal! Map represents 50 m, 1 cm = 50 m, 1 cm on map! Its equivalent distance on map is equal to one full scale ‘ fraction... Ans38 – the following are the main uses of scale with engineering in! Scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required engineering drawing long in! Scales, check out this tutorial on CAD scale Factors by ArchToolbox ‘ Representative fraction in! Or ( 1:1 ) means drawing & what is representative fraction in engineering drawing are of same size adopted for civil engineering drawings depends upon degree... Called Representative factor is more than unity is drawn on reduced scale, need to know the “ Representative (.