1.1 A process technician's job is to make sure that every process in an industry is running safely and continuously. In the past, the monitoring of these processes was done at the unit and was maintained locally by operators, technologists, technicians and engineers. Today, many of these process plants have gone to full automation, which means that engineers, technologists, technicians and operators are helped by a distributed control system that communicates with the instruments in the field. 1.1.1 In the context of process control, what are the tasks that a control system is required to perform? (2) 1.1.2 What are the five (5) operational objectives that a control system is aimed to achieve? (5) 1.1.3 Briefly explain the word control as used in Process Control Module. (3) 1.1.4 How is process control mostly documented? (4) 1.1.5 Mention any five (5) process control variables that are normally controlled in some process measurement industries. (5) QUESTION 2 2.1 As a chemical technician, it is very important that you can read technical drawings in a process space, especially piping and instrumentation diagrams and block flow diagrams. In the context of process control, have a look at the figure below and describe the following controlled process in your own words. (10) 3 2.2 One of the main tasks of chemical technicians is to use any sophisticated software program, such as Microsoft Visio, to come up with a process and instrumentation diagram of a plant. In order to do this, you need to use the correct symbols. Draw the process symbol for a: (a) Positive displacement pump (3) (b) Shell and tube heat exchanger (3) (c) Transmitter counted in the field (3) 2.3. In piping and instrumentation diagrams, process symbols, piping and connections are represented using several different symbols. Identify the process symbols, piping and connections listed below: a) (2) b) (2) c) (2) d) (2) e) (2) f) (2) TOTAL MARKS = 50