Final KB Qs Module 2: Design Of Experiment

Question 1

What is Availability and Utilization?

Answer 1

The availability factor is the percentage of time which a process is operational (i.e. the process is ‘running’) while the utilization factor is the percentage of time that a process is being used for its intended duty while the process is operational.

Question 2

Name the important roles of process design of a flowsheet

Answer 2

Test Work – They are used to design the test program

Project Costing – Project estimation is based on equipment costs … need to make sure you have included all equipment.

Building – You need to make sure you have every nut and bolt … flowsheets are at the center of this activity.

Question 3

Process flowsheets show every equipment. Name the types (3). Give examples for each.

Answer 3

*Ancillary systems (e.g. Dust collection, overhead conveyors, ect…)
*Plant utility equipment (e.g. compressors, water systems, ect…)
*Equipment involved in the movement of the ore (chutes, pump boxes, ect…)

Question 4

On what depends the number of flowsheet? (2)

Answer 4

1. The level of accuracy of the project ( a conceptual study will need very few flowsheets compared to an EPCM).
2. The complexity of the process not the tonnage (a hydrometallurgy plant can requires many more flowsheets than a mineral processing plant)

Question 5

When drawing a flowsheet what should accompany every equipment?

Answer 5

*Equipment name
*Equipment number
*Process streams associated with the equipment (going in/out)

Question 6

What is the Design of Experiments?

Answer 6

efficient procedure for planning and conducting scientific experiments investigate the relationship between input and output factors

Question 7

Nuance correlation and causation.

Answer 7

“Correlation does not imply causation” means that a correlation between two variables does not imply that one causes the other

Question 8

Name the 7 steps of DOE

Answer 8

1. Consider all variables (factors) affecting the plant
2. Establish the important measures of performance (responses)
3. Choose a design based on how many factors affecting the system (design choosing)
4. Determine which factors are most important (important factors) and continue next step (optimization)
5. Develop a model (mathematical description – an equation) of how the key factors relate to the responses (i.e. y’s as a function of x’s)
6. Use the model to find the optimum operating conditions for the process
7. Validate the model

Question 9

Name the steps of Response surface methodology (RSM) of DOE.(5)

Answer 9

(i) Perform a series of experiments.
(ii) Developing a mathematical model.
(iii) Determine a maximum or minimum value of response
and analyze the model.
(iv) Draw two and three-dimensional (3-D) plots.
(v) Optimization.

Question 10

Give the 2d representation of Central composite designs

Answer 10

Question 11

Give the number of experiments formulas

Answer 11

Question 12

Give the α value formula

Answer 12

Question 13

Give the code and actual values formula

Answer 13