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2017/2018 Technical Drawing obj and essay theory Questions and answers Now posted for free

By | On March 22, 2017 (6 months ago)
WAEC T/D ANSWER
ANSWER SECTION A  (PART 1)
(a)        Draw the true shape of the laminae.
(b)        Measure and state the:
(i)         angle of inclination to the horizontal plane;
(ii)        true length of AC.
(c)        Indicate on the drawing, the:
(i)         auxiliary elevation;
(ii)        auxiliary plan.
ANSWER
Candidates were expected to:
(a)        (i)        COPY THE GIVEN VIEW:
(1)        draw the front elevation;
(2)        draw the plan;
(3)        draw the X – Y axis.
FIRST AUXILIARY ELEVATION:
(ii)        (1)        draw the horizontal line, A1D1 in the front elevation;
(2)        project from D1 to D in  the plan;
(3)        join AD and extend it beyond the X – Y axis;
(4)        draw parallel lines from B and C respectively to the line AD extended;
(5)        draw X1Y1 axis perpendicular to AD extended;
(6)        locate B2, A2D2 and C2 using X – Y as datum with the corresponding dimensions from the elevation on X1 Y1 for the first auxiliary elevation;
(7)        draw the first auxiliary elevation.
(iii)       TRUE SHAPE (SECOND AUXILIARY PLAN)
  1. draw X2Y2  axis parallel to B2 C2 ;
  2. locate A3, B3  and C3 use X 1 Y1  as the datum with the corresponding dimensions from the plan on X2Y2;
  3. join the points A3, B3  and C3 to obtain the true shape.
(b)        Measure, indicate and state the:
(i)         angle of inclination to the H.P =  590 ± 10 ;
(ii)        true length of AC = 66 ± 1;
(c)        Indicate:
(i)         auxiliary elevation;
The solution is shown below:
ALTERNATIVE METHOD
TRUE SHAPE OF TRIANGULAR LAMINAE
Candidates were expected:
  1. (i)         COPY THE GIVEN VIEWS:
  1. draw the front  elevation;
  2. draw the plan;
  3. draw the X – Y axis.
(ii)        TRUE SHAPE:
  1. draw to obtain the true length AB;
  2. draw to obtain the true length of AC;
  3. using the true lengths to obtain the true shape.
  1. (i)         Measure and state:
  2. angle of inclination to the horizontal plane (HP) 59 ± 1;
  3. true length of AC = 66 ± 1.
(c )       Indicate:
  1. auxiliary elevation;
  2. auxiliary plan (true shape).The solution is shown below:

 

ANSWER NO 3

 

 

 

(a)        INTERNAL TANGENT TO TWO UNEQUAL CIRCLES:
(i)         draw two vertical centre lines at A and 100 apart;
(ii)        draw one horizontal centre line;

  1. draw two unequal circles Ø30 and  Ø58 at A and B respectively;
  2. draw another circle Ø88 (Ø58 + Ø30) at centre B;
  3.  bisect AB and draw semi-circle on AB;
  4.  join BD to intersect circle Ø58 to locate point T;
  5.  draw a line at A parallel to BD to the smaller circle Ø30 to locate point P;
  6.  join PT to obtain the internal tangent;
  7.  measure and state the length of tangent PT = 91 ± 1.

 

The solution is shown below:

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