Ordinary level 2026 North West mock Engineering drawing 2

Here are the questions and instructions extracted from the second image:

WORK TO BE DONE

PART I – TECHNOLOGICAL STUDY (20 marks)

Question 1: Functional analysis and designation of pieces (5 marks)

• 1-1 Give the role of the flat on the big diameter of piece 3. (Removed section D-D).

• 1-2 Give the role of the two opposite flats on the smooth area of piece 7. (see the removed section C-C)

• 1-3 Designation of pieces

  • Body 1 is fixed on the casing with the piece designated Screw CHC M8 -15. Interpret each element of this designation.

Question 2: Knowledge on materials (5 marks)

• 2-1 Decode the designation 35 Ni Cr 6 of the material of piece 7 by indicating the significance of each element in this designation.

• 2-2 Indicate the name of the family of materials in which piece 10 belongs by marking an X beside the right answer.

Question 3: Study of linkages (5 marks)

• Indicate the nature, mode and three (03) characteristics of each of the links 1-7 and 3-1 (by completing or by encircling the right answers on the table).

Question 4: Fit (5 marks)

• Given:

  • the fit between 1 and 2 is: $\phi 12\ H7\ m6$;

  • the fit between 1 and 3 is: $\phi 29\ H7\ g6$.

• 4-1 Calculate the maximum and minimum clearances of the fit between 1 and 2.

• 4-2 Hence deduce the nature (the type) of fit.

Question 5: Chain of dimensions (5 marks)

• 5-1 Draw the minimal chain of dimensions related to the condition dimension $\vec{a}$

• 5-2 Give the equations of the maximum and minimum allowances of $\vec{a}$

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PART II – GRAPHIC STUDY (30 marks)

On an A4 V tracing paper, with instruments and pencil, complete to scale 3:2 on page 6/6, the detail drawing of body 1 in the following views:

• Front view section A-A;

• ½ top view (do not draw the hidden contours)

• Indicate the functional dimensions of all the threaded holes and the fit dimensions on the drawing.