Join the DP Advance Quiz 33: Challenge Yourself with 20 Multiple-Choice Questions!
Let us begin by analyzing the approach to developing 20 multiple-choice questions derived from the provided material on DP Capability and Motion Prediction.
It is essential that I first gain a comprehensive understanding of the content. The primary subjects addressed encompass:
- When the analysis runs: Every 5 minutes in Auto Position mode after 2.5 minutes of being in Present Position and Heading. Stops on changes like position, heading, or system mode.
- Simulation Possible: Green indicator allows forcing a new analysis via OK/Apply. Uses the OS in command.
- DP Capability Analysis: Predicts max weather conditions, outputs wind/current speed envelopes, evaluates present conditions, worst single failures, blackouts for drilling vessels, and optional failures (thrusters, generators, switchboards).
- Forces in calculations: Sum equals average thruster output; wind measured, waves from IMCA relation, current 1.5% of wind. Use present condition data accurately.
- Relationship between wind and waves: North Sea data (Forties) with swell considered. Used in older software versions via USE button.
- Calculations: Earth fixed forces, vessel rotated in steps (e.g., 10°), check thrust sufficiency for various scenarios (present, failures, etc.)
- Accuracy issues: Affected by wrong wind data, thruster errors.
- Operational Margins: Color indicators (green=safe, orange=unsafe, red=drift-off). Messages for insufficient thrust.
- Settings (Main, Run Control, Thrusters and Power, Waves): Auto calculation of wave/current based on wind. Manual entry possible but must be accurate. Danger area definition when showing only one envelope.
Now, I need to create 20 MCQs with 4 options each, each correct answer based on the details.
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Start with the “when” questions. For example:
- How often does the DP Capability and Motion Prediction analysis run automatically when conditions are met?
- Options: a) Every 2.5 min, b) Every 5 min, c) Every 10 min, d) Every 15 min.
- Correct: The exam with the answers is available for purchase!
Next, triggers that stop the analysis (change position, heading, system mode). So:
- Which action stops the DP analysis and requires waiting 2.5 minutes for a new analysis?
- a) Changing wave settings, b) Changing position, c) Adjusting wind speed, d) Updating thruster output.
- Correct: The exam with the answers is available for purchase!
Simulation Possible being green allows forcing analysis via OK/Apply. So:
- When the Simulation Possible indicator is green, what can the operator do?
- a) Start a simulation in all OS, b) Force a new analysis with OK button, c) …
- Correct: The exam with the answers is available for purchase!
OS in command is highlighted. For example:
- When starting a new analysis manually, which Operator Station should be used?
- Options mentioning OS in command. Correct:The exam with the answers is available for purchase!.
Each OS runs separately, not synchronized. So a question on why other stations might show outdated results, answer because their analysis is cyclic and not updated immediately.
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For DP Capability Analysis outputs: limiting wind/current envelopes and evaluated situations. Questions on what’s always evaluated (present condition, worst single failure if DP Consequence is running, blackout for drilling with RMS). For example:
- Which situation is always evaluated in the DP Capability Analysis?
- a) Present condition… Correct.
Forces: sum equal to average thruster output, wind from measured, waves from IMCA, current 1.5% of wind. Maybe a question on current speed calculation.
- How is the current speed determined in the analysis?
- a) 1.5% of wind speed, b) Direct measurement…
Entering data: present conditions, accurate. Which is correct? For instance, entering data based on past conditions would be wrong.
- “You must only enter data valid for…” Answer PRESENT conditions.
Older software using the USE button for waves/current directions. SW older than 7.1 use suggested via USE button.
- What should operators do with SW older than 7.1 regarding wave and current?
- a) Manually calculate, b) Push USE button… Correct.
Calculations: vessel rotated in steps (10°), checking thrust sufficiency. So what’s the normal step increment.
- What is the normal heading increment step in calculations?
- a) 5°, b) 10°, … correct is The exam with the answers is available for purchase!.
Failure options selected: thruster, generator, switchboard. Run Control settings include environmental variation options.
- In Run Control settings, what can the operator vary in simulations?
- a) Wind speed, current, etc. (Environmental components either fixed or varying. The correct answer based on Environmental Variation section: they hold environmental components constant and rotate the vessel. But when varying, the options are wind speed, waves, current. So the question might be: Which environmental component is varied in ‘Environmental Variation’ when finding the limiting force? Answer varies per selection, but default might be increasing the force (wind, current) until thrust is insufficient.
Accuracy issues related to wind measurements and thruster errors.
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- What affects simulation accuracy? Wrong wind measurements… Correct.
Operational margin colors: green (safe), orange (unafe), red (The exam with the answers is available for purchase!). Question about indicator colors.
- What color indicates drift-off is likely?
- The exam with the answers is available for purchase!
Danger area related to showing dashed envelope when only one envelope selected.
- When can the Danger Area envelope be displayed?
- The exam with the answers is available for purchase!
Settings Main: wave and current auto calculated based on wind. Manual input must use present data. Also, note current entry should not use DP system’s displayed values because those include unknown forces. Better set to zero than use incorrect values.
- For entering sea-current speed, what’s recommended instead of using system-displayed values?
- The exam with the answers is available for purchase!
Settings Thrusters and Power: Mean and STD for thrusters/generators to determine critical units.
- What do Mean and STD values in Thrusters and Power settings determine?
- The exam with the answers is available for purchase!
Settings Waves: options for wave spectra (Pierson-Moskowitz, JONSWAP, Doubly-Peaked). Questions on regions.
- Which wave spectrum is typical for the North Sea?
- JONSWAP and Doubly-Peaked. Need to check the content, since JONSWAP is North Sea, and Doubly-Peaked also (Thorsethaugen ’94). The material says for waves:
Pierson-Moskowitz: North Atlantic.
JONSWAP: North Sea.
Doubly-Peaked: North Sea (Thorsethaugen). So a question could ask which is typical for North Atlantic or North Sea.
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- Which wave spectrum is used for the North Atlantic?
- The exam with the answers is available for purchase!
Run Control settings: Present systems always selected. Worst single failure auto-selected when DP Consequence is running.
- Which failure is automatically selected when DP Consequence Analysis is running?
- The exam with the answers is available for purchase!
Now, aiming for 20 questions. Ensure covering all sections, including relationship between wind and waves (IMCA, North Sea data), thruster failure inclusion by operator, etc. Also, the part about blackout evaluation for drilling with RMS.
Another angle: The correction force is added to accommodate sea current? The sum of wind, wave, current forces is equal to thruster output. The difference adds as correction force. So a question like:
Forces in calculation: The sum of environmental forces is equal to the…
“The calculations demonstrate that the aggregate environmental forces correspond to the mean output of the thruster.” However, is the correctional force applied to account for the sea current?
“According to the details provided, the correction force is determined by calculating the disparity between the combined effects of the three forces (wind, wave, and current) and the output of the thruster. This adjustment accounts for the influence of the sea current.“
So if sum of wind, wave, current is less than thruster output, their sum is adjusted? Not sure, but the question could be what the correction force accommodates (sea current).
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Question 19. What is the purpose of adding a correction force in the calculations?
- a) To adjust for wave height…
- Correct answer: The exam with the answers is available for purchase!
Finally, note that OS in command’s changes are only reflected in other stations after their next simulation (The exam with the answers is available for purchase!). So:
- When a change is made in the OS in command, how do other operator stations update their analysis?
- a) Immediately sync…
- Correct: Continue cyclic analysis; The exam with the answers is available for purchase!.
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