INSTRUCTIONS TO CANDIDATES 1. This question paper consists of
five (5) questions. 2. Answer ALL questions in the Answer Booklet.
Start each answer on a new page. 3. Do not bring any material into
the examination room unless permission is given by the
invigilator. 4. Please check to make sure that this examination
pack consists of : i) the Question Paper ii) an Answer Booklet
provided by the Faculty iii) a twenty three page Particle
Technology Data Booklet provided by the Faculty
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO
CONFIDENTIAL 2 TEST 1/OCT 2013/CHE572
Hak Cipta Universiti Teknologi MARA CONFIDENTIAL
QUESTION 1 (PO2, CO2, C3, C4) Group D particles as shown in
Figure 1 were packed into a container that is shown in Figure 2
whereby the diameter is 2.5 cm and 10 cm height. Given that the
particle density as 2350 kg/m3.
Figure 1 Figure 2
a) Calculate the average surface to volume diameter dSV of the
particles and voidage of the
packed particles if the particles height is approximately 3.2
mm.
(10 marks) b) Prior to the packaging process, the particles were
stored in a hopper whereby the
internal friction and wall friction test were conducted using
Jenike Shear Tester to obtain effective yield locus and wall yield
locus respectively. The results are plotted as shown in Figure 3.
Then, the major and minor Mohrs circle of a family of yield loci
are plotted as shown in Figure 4. Determine the wall slope and
opening diameter of the circular hopper to ensure mass flow of the
material.
Figure 3 Internal friction and wall friction tests Figure 4
Powder flow function
