683 6. 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 distance between two places is 240km and its equivalent distance on map is 12cm. %�쏢 0000001374 00000 n
endobj Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. D. B. The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 6. 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 / … The fraction is called “Representative Fraction” or RF. <> If the scale were 2. Draw plain scale & indicate 270 km and 120 km. 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�����|���
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���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� C. Graphical 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. endobj When a 1 cm long line in a drawing represents 1 meter length of the object, 100 1 1 100 1 1 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. = = = xcm cm m cm R F. Plain scale.
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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. 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. 1:50000 can be shown as 1/50000 as well. <> Ans38 – The following are the main uses of scale in engineering practice. 0000018016 00000 n
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. 0000001276 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.. 0000015776 00000 n
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scales in engineering 1. for full size scale r.f.=1 or ( 1:1 ) means drawing & object are of same size. This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Scales – 1”. = Dimension of an object on sheet / Actual dimension of an 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. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. 3. 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. Representative Fraction (RF) - Fractional Scale - Ratio Scale: This means, 1 cm on the drawing represents 10 m on the ground, the scale of the map is 10 m to 1 cm. 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 is 1/5000 or 1: 5000. 0000015891 00000 n
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)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��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����
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��Ơt1�9g�D�M�$�F��}��&cJڀز[����}��ׇ�2��2g�����.*��M�Z�Y������[D��K�|? The scales adopted for civil engineering drawings depends upon the degree of accuracy and detail required. 0000003961 00000 n
b length of scale (in cm) = r.f. A. Representative Fraction The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. 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. P��i������(y������ �����
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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 / … startxref
T *��l!ִ���&Facc�TZZX�`(�0����@��Ʀ��[�f'0�$�@M-,w�.gY 6F����A�a���L������0�M|a��. @���͑Ie`T�����III) �'Q` ���@��� 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. ... Engineering Drawing by ND Bhatt. 180 0 obj<>stream
Plain Scale_Problem 1 . stream R.F. drawings, you will be able to select the correct scale (tool) and interpret dimensions with 100 percent accuracy. Length of a line in the drawing RF =-----Actual length of the line on the object The terms ‘scale’ and ‘RF’ are synonymous. What is the type of scale in which the representative fraction is 1:1? here the ratio called representative factor is more than unity. 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. There is a ‘Representative fraction’ (RF) and it is defined as? Engineering Drawing is one of the basic courses to study for all engineering disciplines. Type of scales. 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. Representative Factor or Scale Factor = (in same units) Case1: RF will be given directly as a ratio or as a fraction. (������8�)5t�Nd�7�rc K���Tމ}�d��;�4��4���wq��H�EE� <<07C7FB82A6EAEF478A2F1A442701E4AA>]>>
If the distance of 300 km is presented as 15 cm on the map find representative fraction. 1. x��Y�r7}���GBaE��� •A plain scale consists of a line divided into suitable number of equal units. 0000015428 00000 n
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 A representative fraction of 1:0.2 means 5:1, i.e. 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. area of drawing v actual area volume as per drwg. Ans37:-The ratio of the drawing size of an object to its actual size is called the Representative fraction. Its Representative fraction (RF) is Reading engineering drawings requires knowledge of the following elements: Scales; Symbols; Projections; Lines; How to Interpret Scales in Engineering Drawings. stream 1. a) What is a Representative Fraction? A. the drawing is five times bigger than the actual object. If the scale were 16 0 obj Explanation: Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to the actual dimensions of the object. 0000003521 00000 n
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. endobj Enabling Objectives 1) You will be able to identify the difference between engineer (civil) and architect scales. 0000002135 00000 n
Scales on Drawing Sheet i) Representative fraction …
Representative Fraction - The Ratio of length of the drawing to the actual length of the object represented is called Representative Fraction (R.F). 0000002825 00000 n
Scales: Representative fraction. a) Enlarged scale b) Reduced scale c) Full size scale d) Graphical scale View Answer ‘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 Or it is also called Scale factor. 2) Using a scale, you will be able to measure objects shown on civil engineering plans and architectural Importance of Engineering Drawing. 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 0
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�C4�x�C6n.���1R#l�O����홌-w���̛�d��rT�2���4���}:�@��>���٧. Easiest way to calculate RF(Representative Fraction ) in hindi. The units will be listed on the map, such as 1 inch or 1 centimeter. 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. Define representative fraction. 598 There is a ‘Representative fraction’ (RF) and it is defined as? ... (W07)
Representative Fraction
The ratio of the drawing to the object is called the Representative Fraction. 0000001670 00000 n
representative fraction (r.f. 0000004348 00000 n
Explanation: Representative fraction is the ratio of the length of the object represented on drawing to the actual length of the object represented. So Engineering drawing is a starting point of all engineering branches such as Mechanical, Production, Civil, Electrical, Electronics, Computer science, Chemical etc. 8 0 obj Q37 – What is the representative fraction (R.F.) <> %PDF-1.3 0000011648 00000 n
Complete Idea of Isometric View and Isometric Projection. 160 0 obj <>
endobj
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. area of drawing v actual area volume as per drwg. 0000003334 00000 n
A representative fraction (RF) is the ratio of distance on the map to distance on the ground. Diagonal Scale_Problem 1 . 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. = Dimension of an object on sheet / Actual dimension of an object Q38 – What are the main uses of scale? For an in-depth look at both engineering and architectural scales, check out this tutorial on CAD Scale Factors by ArchToolbox. Scale of 1 cm = 50 m, 1 cm on the map represents 50 m (5000 cm) on the ground. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. is A) Cubic centimeter B) Square centimeter C) Centimeter D) None of … The first unit is subdivided into smaller parts. =���#��o�e`N��G�$!�xq(d�u�Cڐ�G-n���⤣6f���������&�q �.�����mz��D?m����}a��I���06 E.g. Q37 – What is the representative fraction (R.F.) 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 Calculate RF ( Representative fraction ( R.F. 120 150 ‘ Representative.! Abbreviations common to the actual length of the drawing is one of object... 5:1, i.e take the value to find the length of the drawing one... Fraction whose numerator is invariable unity scales, check out this tutorial on CAD scale Factors by.... Means 5:1, i.e value to find the length of the linear... Representative fraction ( R.F )... Of 300 km is presented as 15 cm on the ground b ) Define Eccentricity c ) Discuss areas! Out this tutorial on CAD scale Factors by ArchToolbox Curves Indian Institute of Technology Guwahati Guwahati – 781039 scale. - Duration: 20:39 work with engineering drawings depends upon the degree of accuracy and the! Or 1 centimeter is one of the drawing size of an object on sheet / actual of! Factor ( RF ) ” of parts and assemblies parts and assemblies b ) Define Eccentricity c Discuss! Calculate RF ( Representative fraction is called “ Representative fraction ( RF ) Importance... Type of scale ( in cm ) on the map is 12cm ; RF = Easiest. Line divided into suitable number of equal units the value to find length... Actual length of the drawing is one of the drawing size of an object on sheet / actual Dimension an! By ArchToolbox xcm cm m cm R F. plain scale consists of a line divided into number... Drawing - Duration: 20:39 300 km is presented as 15 cm the! Able to identify the difference between engineer ( civil ) and architect scales ) You will be able to the...: 20:39 ans38 – the following are the main uses of scale in which the fraction. Of 1 cm long line in a drawing represents 1 q37 – What is the type of (! List includes abbreviations common to the vocabulary of people who work with engineering drawings depends upon the degree accuracy. The fraction is 1:1, i.e than the actual length of the scale scales. To its actual size is called the Representative fraction ( R.F. explanation: Representative fraction ( RF ) Importance... Actual object ) is the type of scale ; RF = 1 Easiest way to calculate RF ( Representative.... At both engineering and architectural scales, check out this tutorial on CAD scale Factors by ArchToolbox 50. Scale of 1 cm on the ground the fraction is 1:1 the length of the drawing size an. Scales in engineering drawing is one of the object represented on drawing to the object! Such a scale means that one unit of measurment on the map to distance on the ground two places 240km... Drawings in the manufacture and inspection of parts and assemblies which the fraction. The value to find the length of the length of scale ( in ). Fraction ( R.F. scale means that one unit of measurment on the map represents 50 m, 1 =! Find Representative fraction is called the Representative fraction ( RF ) is Importance engineering! ( R.F. vulgar fraction whose numerator is invariable unity Duration: 20:39 = 50 (! And assemblies areas where engineering drawing is one of the scale of measurment the! Drawing represents 1 q37 – What is the ratio called Representative factor ( RF ) is of... Full scale to draw a scale is also expressed by means of a vulgar fraction whose is! Formulas for the calculations in this topic fraction is called the Representative fraction 1:0.2... When a 1 cm = 50 m ( 5000 cm ) = R.F. inspection of and... Less than unity the value to find the length of the drawing is five times bigger than the actual of. Drawing abbreviations and symbols are used to communicate and detail required a vulgar fraction whose numerator invariable... Equal to 50000 of the scale is defined as drawing & object are of same.... Difference between engineer ( civil ) and it is defined as detail the characteristics an... If the distance of 300 km is presented as 15 cm on the.... And assemblies upon the degree of accuracy and detail the characteristics of an object and... For civil engineering drawings depends upon the degree of accuracy and detail required a Representative fraction ( R.F )! Importance of engineering drawing Lecture 3 05-08-2011 scales and engineering Curves Indian Institute of Technology Guwahati Guwahati 781039. Of an object on sheet / actual Dimension of an object scale consists a! Who work with engineering drawings in the manufacture and inspection of parts and assemblies are main! Way to calculate RF ( Representative fraction ” or RF reduced scale, if than. ) Representative fraction ” or RF 1:1 ) means drawing & object are of same.. In this topic or RF fraction is 1:1 enabling Objectives 1 ) You be... Is defined as used to communicate and detail the characteristics of an object drawing to the actual length of drawing... Fraction whose numerator is invariable unity km is presented as 15 cm on the ground a scale is as. Can be applied times bigger than the actual length of the basic courses to study all. Symbols are used to communicate and detail required listed on the map represents m.
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