As the marking progresses, each marker keeps a tally of the marks assigned for the question they are marking. These marks are statistically examined every day and are used as a control, along with systematic checks by the Senior Marker, to ensure the accuracy of the marking procedure. During the marking, marking control scripts are distributed to ensure the reliability of the marking according to the agreed marking scales.
A report with marker comments and grading scales is also prepared for the information of the Engineering Science HSC Examination Committee. An N/A (Not Attempted) is awarded when there is no evidence (blank answer) for any part of the question. Concept mistakes are not awarded marks, but mistakes made in one part of the question and carried over to the next part of the same question are not penalized twice.
If two solutions are given, one correct and one incorrect, and an answer is not placed in the space provided, then the marks awarded are at the discretion of the Senior Marker and Supervisor of Marking. Looking back at a number of previous papers, parts become the theme for many questions, especially in part II of the exam paper.
The point of application of the weight force is not in the center of the beam AB. Few (if any) candidates tried a complete or graphical solution. ii) Determine the magnitude and nature of the axial force in bar BC. Answers: (i) The axial force in bar BC would increase. ii) The horizontal component of the reaction at A would increase.
Most candidates were able to draw a clear free-body diagram that demonstrated a correct understanding of the information given. Under the diagram, write the name of the object that best represents its polymer structure. This section was attempted by most candidates and most answers demonstrated a good understanding of polymer structures, applications and uses.
Answer: B precipitates from the solid solution (at T4) at the grain boundaries and inside grains. A cooling curve for a specific alloy is also given. i) Determine the composition of the alloy represented by the cooling curve above. Project a right side view of the prism so that surface A is seen as the true shape.
There seems to have been a widespread lack of understanding of the basics of orthogonal projection.
After a period of 12 seconds, the cyclist and rider reach one. i) Determine the rider's acceleration down the slope. Candidates found this the most difficult part of the question and were answered very poorly as a result. At what stage is the fiberglass added to the composite in the manufacture of the bonnet.
Candidates are encouraged to focus on the benefits in the properties of the finished bolt or in the manufacturing process. Labels and leaders pointing to the relevant parts of the microstructure should both be obvious. On a scale of 5 : 1, create a half-sectioned front view of the assembled parts as viewed in the direction of the arrow.
The conversion process allows candidates to achieve marks and full marks in relation to the correctness of the solution. Candidates' answers to this question indicated a reasonable knowledge of general assembly drawing; however some aspects of the question were poorly answered. Many candidates failed to demonstrate an understanding of the manufacture, assembly and practical use of machined parts.
Many candidates were also unable to correctly represent the end of the cable with a standard termination. The beam is simply supported at A and C. The cross section of the beams is also given. The bridge has a uniformly distributed load of 5 kN/m applied. i) Determine the weight of the box girder.
The first step in solving this problem is to find the volume of the compound shape. The total load on the beam is equal to the combination of the applied load and its own weight. Draw and label the microstructure of the alloy at a temperature of 1490°C in the space provided.
Generally well answered, but many descriptions did not show any understanding of the reaction beyond stating the formula. The total linear velocity vt can be used to find the value of the radial force. The force in the spring can only be determined if a free body diagram of the sliding wedge is taken into account.
Candidates generally understood that the question involved the aging process, but did not demonstrate an understanding of the various steps involved.
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Those who did, failed to understand the need for an auxiliary view to find and use the "true length" of the shaft - projected on the top view. P roject an auxi li ar y vi ew perpendicular to the top views of bc and ad to give an edge to the base. On the auxiliary view, draw the axis perpendicular to the base and measure the true length of 55 mm.
Project back to the top view and find the position of the vertex on the axis perpendicular to ad and bc. Project down from the top view and using the distances from the auxiliary view, draw the base and top in the front view. Draw the top and front views of the two lines AB and CD on the axes given below.
The majority of candidates who attempted this question were able to locate the dots and draw the lines in both views. Most candidates realized the need for an auxiliary plane and tried to find the true length of one line. Some candidates were unable to proceed to the next step when establishing a true length; that is, placing a plane perpendicular to the true longitude and projecting a point view.
A top view and a front view of a portion of the transition are shown below in a third angle projection. Marks were awarded for recognizing the need to triangulate the surface, establishing 'true lengths' to be used in the triangulation, plotting the points and then making a suitable sketch. A true length chart combining "front view heights" and "top view lengths" can help to avoid confusion.
Curve bc is shown as a true form on the given front view and can be drawn with a compass. The top view, right side view and incomplete front view of two intersecting triangular prisms are given below in third angle projection.
