Dmn 2/ Lvl 3 Flashcards
You are assisting the start-up of a system of single-loop digital controllers which are networked (a distributed control system). The SLOC use the charge-balance method of A/D. What is one area of concern?
A. Whether a token passing or CSMA/CD scheme is used for networking
B. The individual controllers sample/ second rate for the application
C. Whether 4-20 or 10-50 mA analog signaling is used
D. Whether controller data output is EIA 232 or 485
B
Using the figure below, which figure illustrates how the reaction curve should look when derivative is added to the P&I tuned process.
A. A
B. B
C. C
D. None
B
In the figure below, P (the period) as measured will provide the right ratio of Proportional Gain to Integral Action using the premise:
A. 1.5* Ti < P > 2.0Ti
B. 1.5 Ti > P < 2.0Ti
C. 1.5Ti < P < 2.0Ti
D. 1.5 Ti > P > 2.0*Ti
C
For this control system to be effective, the process must be
A. integrating
B. self-regulating
C. run-away control
D. externally activated
B
For the process shown in the figure, the shape of the vessel will primarily determine if the process is:
A. linear/non-linear
B. splashy/ calm
C. maintainable
D. costly
A
For the process shown in the picture (Figure for Question 6 & 7), The output of FT 231 has a square root extractor because
A. dP is the reciprocal of average velocity
B. Average velocity is the reciprocal of dP
C. dP varies as the square of average velocity
D. Average velocity varies as the square of dP
C
on an emergency equipment skid for a refinery .lt was discovered during the site-acceptance inspection. It is a smart dP intended for co-planar mounting.The most likely problem is:
A. use of excessive Teflon tape on the conduit connections
B. co-planar mounting cannot be used in a vertical application
C. requires the use of pipe reducers to keep Reynolds numbers high
D. the contractor could plumb, but apparently didn’t read installation manuals
D
The first consideration of a control system upgrade is to:
A. Configure the DCS.
B. Upgrade the control strategies.
C. Decide on DCS, PLC or DOC application.
D. Have a correct set of existing documentation.
D
On a project,the Critical Path Method (CPM) chart provides you all of the following information EXCEPT:
A. Project tasks to be performed .
B. The importance of project tasks.
C. Relationships between project tasks.
D. The sequence and duration of project tasks.
B
A start-up plan for a large paper mill required a partnering alliance between
the start-up team and the I&C maintenance group. Which of the following is the BEST way to minimize calibration costs?
A. PC and associated calibration
B. Exclusive use of smart transmitters
C. Close interaction of the site startup team and I&C technician group
D. IMMS programming and the use of portable multifunction calibration
C
Which agency requires Material Safety Data Sheets (MSDS) for chemicals in contact with process instrumentation?
A. Plant safety office
B. ISA/ ANSI
C. OSHA
D. EPA
C
