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ISC Class XII Board Specimen 2023 : Geometrical and Mechanical Drawing

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi

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GEOMETRICAL AND MECHANICAL DRAWING ---------------------------------------------------------------------------------------------------------------- Maximum Marks: 80 Time Allowed: Three hours (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time). ---------------------------------------------------------------------------------------------------------------- All dimensions are in millimeters. Arcs of circles less than 4mm radius may be drawn freehand. ---------------------------------------------------------------------------------------------------------------- Candidates are required to attempt all questions from Section A and all questions EITHER from Section B OR Section C. The intended marks for questions or parts of questions are given in brackets [ ]. ---------------------------------------------------------------------------------------------------------------- SECTION A 25 MARKS Question 1 [25] Figure 1 given below shows a machine block. Draw the front view, top view and side view by using first or third angle method of projection. Also, draw the symbol of method of projection which you have chosen. X Figure 1 --------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 1 SECTION B 55 MARKS Question 2 (i) Figure 2 shows details of components of a flange coupling used to transmit power from one shaft to another shaft. Left flange (part 2, Qty 1) is connected to the right flange (part 1, Qty 1) using hexagonal nut (part 3, Qty 4) and bolt (part 4, Qty 4). Both the shafts (part 5, Qty 2) are passed through the main central cavity of both the flanges creating a space for inserting the key (part 6, Qty) in the respective flanges thereby providing a locking arrangement for the shafts. (a) Draw full size sectional elevation along A-B of the assembled [25] components. (b) Draw the plan (Top View) of the complete assembly omitting all hidden [10] details. (c) Draw the left-hand side view of the assembly omitting all hidden [10] details. (d) Make a neat parts list for all the components on your drawing sheet. [10] Figure 2 ---------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 2 SECTION C 55 MARKS (i) Figure 3 given below shows the isometric view of a machine block. Copy the [20] isometric view. Figure 3 ---------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 3 (ii) Figure 4 given below shows the machine block. Draw by using first or third [20] angle method of projection Sectional Front View (along A-A), Top View and Side View. Figure 4 ---------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 4 (iii) Figure 5 given below shows Top View of a square base pyramid in first angle method of projection. Copy the given figure. Complete the Front View and draw its Front View and Top View if its axis is inclined at 450 to Horizontal Plane and Top View of the axis is inclined at 300 to Vertical Plane. Given : [15] Axis height = 75mm T. V Figure 5 ---------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 5

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