Which of the following inputs is required before surge or sway can be automatically controlled?
A.
Wind Sensor.
B.
Vertical Reference Sensor.
C.
Power Management System.
D.
Position Reference System .
2.
The possibility of loss of Position and/or Heading is reduced by:
A.
Ensuring system redundancy to Equipment Class 2 or 3.
B.
Deploying multiple Position Reference Systems.
C.
Ensuring DP Operators are well-trained and experienced.
D.
Efficient and comprehensive operational planning.
3.
What does the DP System use to calculate weighting (or confidence) for each Position Reference System?
A.
Distance from the receiver.
B.
Signal strength.
C.
Weather conditions.
D.
Relative spread of fixes.
4.
How many Position Reference Systems should be available and online during a Class 2 operation, according to IMO Recommendations?
A.
1
B.
2
C.
3
D.
4
5.
The function of DP system Redundancy is to:
A.
Enable the vessel to continue operations subsequent to a single failure.
B.
Allow the Captain to sleep better.
C.
Allow the operation to be safely abandoned after any single-point failure.
D.
Allow vessel to use a higher setpoint speed.
6.
What is one disadvantage of a ship working using its DP system compared to being anchored?
A.
DP vessels are less maneuverable than a vessel positioning using anchors.
B.
A DP vessel takes longer to move between work locations.
C.
Continually running thrusters are hazards for divers and ROVs.
D.
A DP vessel can only work in very shallow water.
7.
The following Position Reference System configurations are available for a DP Class 3 operation. Which is the best configuration?
A.
2 DGNSS and Laser.
B.
Taut Wire and two independent HPR systems.
C.
DGNSS, Laser, Artemis and a single HPR system.
D.
DGNSS, Taut Wire and a single HPR system with two transponders.
8.
Under which of the following conditions may positioning be improved by increasing 'Control Gain'?
A.
When station keeping is poor due to high noise in the position reference sensors
B.
When thrusters appear to be 'hunting'.
C.
When encountering increased wind or current conditions.
D.
During periods of poor visibility.
9.
About what point does a DP vessel rotate when changing heading?
A.
The vessel's Centre of Gravity.
B.
A point mid-way between bow and stern.
C.
The vessel's Centre of Rotation.
D.
The location of the motion sensors on the vessel.
10.
How does a controllable pitch propeller work?
A.
RPM constant, propeller blades change " angle of attack" on the hub and direction of rotation reversed to go astern.
B.
RPM varies form zero to 100 percent, propeller bldes fixed and direction of rotation reversed to go astern.
C.
RPM varies from zero to 100 percent, propeller blades fixed and direction of rotation constant.
D.
RPM constant, propeller blades change "angle of attack on the hub and direction of rotation constant.
11.
Which of the following is NOT considered to be a 'Local' Position Reference System?
A.
Hydroacoustic Position Reference (HPR).
B.
Taut Wire.
C.
Laser.
D.
DGNSS.
12.
The DARPS Position Reference System is one in which:
A.
Differential corrections are received and used to increase the accuracy of positioning.
B.
A shuttle-tanker may position relative to a moving point such as an FPSO.
C.
Relative positioning is obtained using a combination of GPS and laser-based systems.
D.
The vessel is allowed to weathervane whilst maintaining position.
13.
For DP Class 2 and 3 operations, at least three Position Reference Systems should be deployed and selected into the DP system. Why should they not all be of the same type?
A.
So that if one PRS fails, the vessel remains fully operational.
B.
To protect against Common Mode Failure.
C.
Because of the improved accuracy available from this configuration.
D.
To provide two back-up references.
14.
Dynamic Positioning can be defined as a system which:
A.
Controls a vessel's position and heading based on joystick inputs from a DP operator.
B.
Automatically controls a vessel's heading exclusively by means of active thrust.
C.
Automatically controls a vessel's position and heading exclusively by means of active thrust.
D.
Controls a vessel's position and heading based on manual inputs from individual thruster controls.
15.
A DP system is divided into seven major hardware elements. Which element is the user interface for the DPO?
A.
DP Operator Station.
B.
GMDSS.
C.
Environmental Reference Systems.
D.
Position Reference Systems.
16.
The Sway is determined from data from:
A.
Gyro Compasses.
B.
Vertical Reference Sensors.
C.
Position Reference Systems.
D.
Draft sensors.
17.
What is a vessel model?
A.
A totally accurate description of a vessel's motions.
B.
A computer algorithm that calculates thruster set point signals.
C.
A mathematical description of how the vessel reacts to the forces acting upon it.
D.
A software routine continually monitoring redundancy level.
18.
Which Position Reference System provides the DP system with a global position (i.e. Latitude and Longitude or UTM co- ordinates)?
A.
FMCW Radar.
B.
Taut Wire.
C.
Laser.
D.
DGNSS.
19.
What is the meaning of DARPS?
A.
Desirable Artemis Related Position System.
B.
Differential Artemis Relative Position System.
C.
Differential Absolute and Relative Position System.
D.
Degraded Absolute and Rigid Position System.
20.
Examples of Positioning Reference Systems (PRS) that can use multiple targets are:
A.
Laser and GNSS.
B.
Laser and DARPS.
C.
Laser and FMCW Radar.
D.
Laser and Taut Wire.
21.
A DP Class 2 or 3 vessel is fitted with four Position Reference Systems (PRS); two DGNSS, Taut Wire and Laser. In this instance, why should the DPO prefer to consider the two DGNSS as just one PRS?
A.
DGNSS systems are less reliable and accurate than surface systems.
B.
This is required by the IMO Equipment Class rules.
C.
Common-mode failures may occur to all DGNSS systems, whereby one event could result in a loss of all DGNSS position references.
D.
The DP Classification societies require this.
22.
A local Positioning Reference System is measuring from a local Reference Origin. Examples are:
A.
Artemis, Taut Wire, FMCW Radar and Laser.
B.
Artemis, DGNSS and Laser.
C.
DGNSS, Taut Wire and FMCW Radar.
D.
DGNSS, Artemis and FMCW Radar.
23.
Why is it necessary for a vessel to be in Auto Position mode for a minimum of 30 minutes before starting work?
A.
To allow the DPO to complete the pre-DP checklist.
B.
In order that additional position-reference systems may be enabled.
C.
To allow the system's mathematical model to build.
D.
To ensure that all thrusters are responding correctly.
24.
If a position discrepancy among three or more Position Reference Systems is detected, the DP system will reject the drifting PRS as a result of the:
A.
Calibration test.
B.
Redundancy test.
C.
Median test.
D.
Consequence Analysis.
25.
Redundancy, with respect to vessel heading input can be achieved by fitting:
A.
2 or more Motion reference unit.
B.
A third DP Operator Station.
C.
An extra DP Control Computer.
D.
2 or more Gyro Compasses.
26.
Underwater acoustics can be utilized for which of the following applications?
A.
Marking underwater features or hardware.
B.
Position reference for DP purposes.
C.
Tracking ROVs or other equipment.
D.
All of the above.
27.
Which is the system that uses a single transducer and a calibrated array of transponders located on the sea floor?
A.
Short Baseline (SBL) acoustic positioning.
B.
Super Short Baseline (SSBL) acoustic positioning.
C.
Long Baseline (LBL) acoustic positioning.
D.
Ultra Short Baseline (USBL) acoustic positioning.
28.
Ultra Short Baseline (USBL) Hydroacoustic positioning is determined by:
A.
Range and bearing of a single transponder beacon.
B.
Difference in time of arrival of signal from a single pinger beacon to an array of hydrophones mounted on the vessel hull.
C.
Acoustic ranging from multiple transponder beacons in an array.
D.
Monitoring signals from a mobile transponder beacon.
29.
When using a Global Navigation Satellite System (GNSS) what is the recommended minimum number of satellites required for position fixing?
A.
1
B.
2
C.
4
D.
5
30.
Performance of an HPR system is often limited by acoustic conditions in the water. What would be an example of such a condition?
A.
Oil leaking from the ROV.
B.
Noise from vessel thrusters.
C.
Conversations between divers.
D.
Noise from the Taut Wire winch.
31.
A major reason for the loss of hydro-acoustic signals is:
A.
Pressure gradient in the water column.
B.
Marine growth.
C.
Engine vibration.
D.
Noise and aeration from thrusters.
32.
When using a Hydroacoustic Position Reference (HPR) system, acoustic reception is not adversely affected by:
A.
Aeration in the water.
B.
Thruster noise.
C.
Heavy snowfall.
D.
Temperature layering in the water column.
33.
The best placement, when possible, of HPR system transponder beacons will be:
A.
Downwind and down-current from vessel location.
B.
Down-current and upwind from vessel location.
C.
Upwind and up-current from vessel location.
D.
Downwind and up-current from vessel location.
34.
Which of the following principles does a GNSS use to determine vessel position?
A.
The GNSS receiver acquires radio signals from satellites, measures the time delay of signal reception and, with known satellite positions, determines multiple position lines.
B.
Range and bearing from reference station is determined from a communications satellite; position is therefore determined by the known location of the reference station.
C.
GNSS satellites monitor the vessel position and transmit the information via communication satellite to the vessel.
D.
The vessel transmits data to the GNSS satellites, which then transmit position data to reference stations for retransmission to the vessel.
35.
Which of the following is NOT a DGNSS quality factor?
A.
The number of satellites being tracked.
B.
The Age or Latency of differential correction data.
C.
The value of HDOP.
D.
Adverse weather conditions.
36.
How are HPR beacons deployed from a DP vessel?
A.
Lowered to the seabed using a wire which remains attached to the vessel.
B.
Lowered to the seabed using a wire which may be buoyed off.
C.
Placed in position using an ROV.
D.
Any of the above methods may be used.
37.
Multipath reception can be a problem for both HPR and GNSS Position Reference Systems by:
A.
Causing the system to listen to the wrong signal source.
B.
Creating a shorter than correct path for the signals.
C.
Decreasing the strength of the received signal.
D.
Confusing the distance and/or direction from the source through signal reflection.
38.
A Dual Frequency GNSS receiver is used to:
A.
Achieve redundancy in the operation.
B.
Improve accuracy by compensating for ionospheric delay.
C.
Get better positioning due to the higher positioning accuracy of military frequencies.
D.
Lock on to a satellite on one channel while scanning on another.
39.
What is the maximum practicable range for FMCW Radar PositionReference Systems such as RADius and RadaScan?
A.
10-50m.
B.
200-1000m.
C.
5000m.
D.
10000m.
40.
If a platform has just one Artemis antenna, how many vessels can be positioned using Artemis as a Position
A.
Two vessels provided that they have different frequencies.
B.
All vessels within a 5 km range.
C.
Five vessels.
D.
One vessel.
41.
A vessel is using one HPR Pole/Transducer in Super Short Baseline (SSBL) mode. Four separate Transponder Beacons are in position and being interrogated. Three beacons are in fixed locations on the sea floor. The fourth beacon is designated 'mobile' and is located on an ROV. For DP Class purposes, this array qualifies as:
A.
Two Position Reference Systems.
B.
Three Position Reference Systems.
C.
Four Position Reference Systems.
D.
One Position Reference System.
42.
What might be the 95 percent accuracy of a Differential Global Navigation Satellite System (DGNSS) using a modern commercial subscription service?
A.
Less than 0.1 meter.
B.
Less than 1 meter.
C.
Less than 0.2 meters.
D.
Any of the above, depending on which service is chosen.
43.
Which of the following may adversely affect the quality and accuracy of positional data provided by satellite-based position reference systems?
A.
The close proximity of large platform structures.
B.
The DGPS antenna being located too high in the vessel.
C.
Interference from laser-based position reference systems.
D.
The use of the UTM co-ordinate system.
44.
How does a Laser Position Reference System measure the bearing of a target?
A.
By monitoring the height of the target.
B.
By combining the relative bearing of the target with the ship's heading.
C.
By measuring the time of flight to and from the target.
D.
With reference to information from the Motion Reference Unit.
45.
When is it advisable to deselect the wind sensor?
A.
When a helicopter is about to land on your vessel.
B.
When relocating the vessel to a new position under DP control.
C.
When temperatures below zero degrees Celsius are forecast or expected.
D.
When thunderstorms are in the vicinity.
46.
A vessel is on DP close to a platform structure. A single Wind Sensor is selected. How will the vessel react if the hull and superstructure is in wind shadow and the Wind Sensor is suddenly exposed to the full force of the wind?
A.
The system will apply thrust and move against the 'Current'.
B.
The system will maintain position with the average thrust used.
C.
The system will apply thrust and move against the wind.
D.
The vessel will drift-off.
47.
How many gyro compasses should, according to IMO Equipment Class requirements, be available and online during a Class 2 operation?
A.
1
B.
2
C.
3
D.
4
48.
How does a Taut Wire determine vessel position?
A.
Davit-head-mounted sensors monitor the tension in the wire to calculate relative position.
B.
It compares wire length measured at any given time with the value at the time of deployment.
C.
Davit-head-mounted sensors monitor the tension in the wire to calculate relative position.
D.
The sensor head measures the angle to the clump weight. This angle is used with either the measured wire length (or the vertical distance) from the sensor head to calculate the relative position.
49.
Of the items listed below, which is the most important to the operation of the DP system?
A.
The Doppler Log.
B.
The Gyro Compass.
C.
Wind Sensor.
D.
Navigation Radar System.
50.
A cable vessel is engaged in ploughing operations using 'Auto Track' mode. Plough hawser tension is being measured and entered into the DP system. If feedback data from the plough hawser tension sensor is lost, then the probable result will be:
A.
The DP system reverts to 'Auto Position' mode.
B.
Position control will be lost.
C.
Plough tension will be displayed by the system as DP Current
D.
The DP system reverts to Joystick mode.
51.
What is the purpose of the 'Wind Feed Forward' facility
A.
Anticipating the wind force and correcting for it.
B.
Providing an immediate opposing thrust to rapid changes in the wind.
C.
Smoothing out peaks and troughs in wind data.
D.
Providing an opposing thrust calculated from drag coefficients.
52.
The DP current is determined by:
A.
Calculation using the mathematical model.
B.
Measurement of the water velocity from the ship's Doppler Log.
C.
Comparison of the vessel velocity from DGPS to the Doppler Log value.
D.
Using thruster forces to determine velocity.
53.
When the DP system is in full automatic control of the vessel, the DP current is:
A.
Determined from the mathematical model.
B.
Measured by current sensor.
C.
Ignored for the purposes of the model.
D.
Updated at 30 minute intervals.
54.
A pipelay vessel is engaged in pipelay operations using DP. In addition to the normal range of position, heading and environment references, feedback may also be required in respect of:
A.
Water depth.
B.
The position of the pipe touchdown point.
C.
Vessel draught, from a draught sensor.
D.
Pipe tension values
55.
A DP system using the 'preferred' method of sensor allocation is fitted with two Gyro Compasses; both are selected into the DP system and one is chosen as the 'preferred' Gyro. The system alerts you that there is a 'heading difference error' between the two Gyros. What would you do?
A.
Call the Platform or Rig for assistance.
B.
Immediately change the preferred Gyro.
C.
Compare the two Gyros with the Magnetic Compass, before deciding whether to change the preferred Gyro.
D.
Deselect both Gyros.
56.
Some DP vessels are fitted with draught sensors, enabling continuous draught feedback to the DP system. This is to allow:
A.
Automatic correction of the height of Artemis and Fanbeam sensor antenna.
B.
Warning to be given of reduced under-keel clearance.
C.
Increased accuracy of data from the HPR system.
D.
Continuous update of the vessel model regarding changes to the shape of the vessel above and below the waterline.
57.
When using a Taut Wire positioning system, which of the following factors are significant?
A.
The clump weight position must be accurately determined.
B.
Accuracy improves as deployed wire length increases.
C.
Accuracy deteriorates as water depth and/or angle of wire increases.
D.
Heavy rain can affect the accuracy of the Taut Wire system.
58.
Which of the following can cause wind model errors?
A.
Locating the vessel in a position which is partly sheltered from the wind.
B.
Increased thruster activity.
C.
Selection of more than three wind sensors.
D.
An incorrect estimation of the sea current.
59.
What is the function of the Motion Reference Unit?
A.
To measure Position.
B.
To measure Pitch, Roll and Heave.
C.
To measure Heading.
D.
To enable compensation for the wind force.
60.
The vessel is on auto DP using a GPS, Artemis and taut wire, you are concerned that the GPS is not giving accurate position information and you decide to change the reference origin to Artemis, how would you achieve this?
A.
Deselect Artemis, wait for the status to read offline, allow vessel model to stabilise, reselect Artemis.
B.
Deselect GPS and tautwire, wait for the status to read offline, then reselect GPS and tautwire.
C.
Deselect Artemis, wait for the status to read offline and then reselect Artemis.
D.
Deselect tautwire, Artemis and GPS, wait until the status reads offline, then reselect select Artemis, allow vessel model to stabilise, reselect tautwire and GPS.
61.
When using the HPR, what information should you pay attention to?
A.
GPS
B.
Gyro
C.
VRS
D.
Tension sensor
62.
What is the purpose of the MRU input in a DP system?
A.
To correct the draft for vertical movements.
B.
To correct the vessels position for tide and swell.
C.
To correct the PRS for vertical movement.
D.
To tell the DP system that the vessel is changing position
63.
You are following a track using the DP autotrack mode and the operator station stops working, what will be the consequences?
A.
The vessel will drift off position.
B.
The vessel will continue to follow the track using dead reckoning.
C.
The vessel will continue to follow the track.
D.
The vessel will stop on track.
64.
You have pressed the thruster start button on the bridge and the thruster is now operational, what signal would you expect to see on the DP screen?
A.
Running, Enabled.
B.
Enabled, Ready, Running.
C.
Running.
D.
Ready, Running.
65.
Whilst manoeuvring at speeds above 5-6 knots, what are the potential hazards?
A.
Thruster interaction.
B.
Thrusters less effective.
C.
False current.
D.
Damage to thrusters.
66.
When using a taut wire, what should you consider?
A.
Working Depth.
B.
Transponder frequency.
C.
Nature of Seabed.
D.
Transponder location.
67.
The vessel is on Auto DP mode and using GPS, HPR and Fanbeam as a position
reference system, the HPR starts to drift from the vessel model position and is rejected by the median test, what could be the reason?
A.
The online gyro may be drifting.
B.
The VRS may be drifting.
C.
The target is selected as a mobile target.
D.
The reference origin is drifting.
68.
You are in auto DP and the DP current reading in the bottom right of the posplot display seems unusually high, what could be the reason?
A.
Incorrect measurement from current sensor.
B.
Incorrect measurement from tension sensor.
C.
Reference origin has drifted.
D.
Measured wind speed has increased.
69.
The vessel is in auto DP mode and you observe all of the reference systems drifting away from the position of the vessel model on the ‘refsys’ view, what could be the reason?
A.
Telegram error between the DP system and the position reference system.
B.
Position Reference system failure.
C.
Unmeasured forces acting on the vessel.
D.
Drifting of the reference origin.
70.
What DP software function is used to ensure the vessel does not blackout?
A.
Power Management System.
B.
Power distribution system.
C.
Power Overload Control.
D.
Switchboard Automation.
71.
You are on auto DP and the light above the HPR begins to flash, what could be the
reason?
A.
The HPR is working.
B.
The transponder is selected to mobile.
C.
The HPR has been rejected by a test.
D.
The draft input is wrong.
72.
You receive the alarm ‘gyro difference’, what has happened in the DP system?
A.
There are 2 Gyro’s and one has a difference of more than 2 degree’s.
B.
There are 3 Gyro’s and one has a difference of more than 2 degree’s.
C.
There are 2 Gyro’s and one has a difference of more than 4 degree’s.
D.
There are 3 Gyro’s and one has a difference of more than 3 degree’s.
73.
Whilst operating in the DP mode, how does the system work out the DP current?
A.
Measure it using a sensor.
B.
Calculate it using the difference between the predicted position and the measured position.
C.
Measure it using the comparison between position reference systems.
D.
Measuring the forces acting on the vessel and calculate it using this information.
74.
You are manoeuvring in DP Joystick mode and the auto sway button doesn’t work,
what could be the reason?
A.
There is no active MRU.
B.
The MRU is not working.
C.
There are no active PRS.
D.
The vessel is moving too fast.
75.
Which of the following inputs are required, as a minimum, to achieve automatic DP control?
A.
Hawser
B.
Current.
C.
Draft.
D.
Gyro.
76.
Which of the following constitute DP control?
A.
Pitch.
B.
Yaw.
C.
Roll.
D.
Heave.
77.
The vessel is in the Auto DP mode and you receive an alarm ‘thruster prediction error’ on bow thruster #2, thruster feedback shows 100% to starboard, what immediate action should you take?
A.
Disable the thruster #2 by pressing the button on the DP desk panel.
B.
Reset controller B.
C.
Call the engine room and ask them to check thruster #2.
D.
Press the emergency stop button for thruster #2.
78.
You are on auto DP with the wind sensors deselected, what will happen to the vessel if the wind changes gradually?
A.
The vessel will quickly lose position.
B.
The vessel will behave ‘nervously’ and oscillate.
C.
The vessel will initially lose position before the change in wind is added to DP current.
D.
The vessel will maintain position and the change will be added to DP current.
79.
A thruster Bias mode can be selected:
A.
To avoid unnecessary fuel consumption.
B.
When Azimuth Thrusters continuously hunt for direction in low environmental conditions.
C.
On a Tunel Thruster.
D.
In the Northern Hemisphere only.
80.
The DP has been in auto DP mode for an hour with the wind sensors are enabled, the wind suddenly increases, what effect will this have on the vessel?
A.
Vessel will lose position.
B.
Vessel will oscillate using feed back.
C.
Vessel will compensate using feed forward.
D.
Vessel will compensate using feed back.
81.
What are the advantages of having 3 or more DP controllers?
A.
Compliance with IMO class 3 requirements.
B.
Voting.
C.
Additional system redundancy.
D.
Compliance with DNV class 3 Requirements.
82.
Which of the following affects the amount of thruster force used while maintaining station in the auto-position mode?
A.
Environmental forces acting on the vessel and excursion from set point, if any.
B.
Vessel IMO Equipment Class and Lloyds classification.
C.
Number of position refernce systems in use.
D.
The class of operation being conduted.
83.
Consequence Analysis is a software function which will produce an alarm if it predicts the vessel is unable to maintain its position in the event of a single worst failure, what does this software check?
A.
If it is safe to carry out DP operations.
B.
An assessment has been made of the environment, Power and thruster systems.
C.
All DP system components are working properly.
D.
It will ensure that the vessel is complying with DP class regulations.
84.
When using a Fanbeam, what potential hazards should you pay attention to?
A.
Wire Length.
B.
Bright flashing lights.
C.
Frequency.
D.
Crane work.
85.
In the Universal Transverse Mercator (UTM) system, how many Zones are there?
A.
24
B.
12
C.
60
D.
48
86.
Which of the following include 4 of the 7 main elements of a DP system?
A.
Safety equipment, thrusters, lifeboats and navigation lights.
B.
Thrusters, power supply, position reference systems and sensors.
C.
Loran, power supply, ballast system and thrusters.
D.
Sensors, stability calculator, position reference systems and magnetic compass.
87.
Which of the '6 degrees of freedom' for movements of a ship are controlled by the DP system?
A.
Pitch, Roll and Heave
B.
Roll, Surge and Sway.
C.
Swell, Heading and Heave.
D.
Sway, Yaw and Surge.
88.
With the DP system set to the 'Auto Position' mode, the system will:
A.
Control the vessel's heading to achieve a minimum power configuration.
B.
Allow the DPO to manoeuvre the vessel using the Joystick control.
C.
Maintain the vessel's position and heading as closely as possible to the set-point values.
D.
Cause the vessel to automatically follow a predetermined track.
89.
A DP system is considered to have 'redundancy' when the vessel has:
A.
More than one Positioning Reference System.
B.
The ability to maintain position and heading subsequent to a single point failure.
C.
More than one DP Operator Station.
D.
More than one Gyro Compass.
90.
To understand the consequences of failure in any redundant part of a DP system onboard a DP 2 or 3 vessel, the DP operator should be familiar with:
A.
The International Maritime Organisation MSC/Circ 645 of 1994 Guidelines for Vessels with Dynamic Positioning Systems.
B.
Standards of Training, Certification and Watch keeping (STCW) Convention.
C.
Safety of Life at Sea (SOLAS) Convention.
D.
The Fallure Modes and Effects Analysis (FMEA) document
91.
What is an FMEA with respect to a DP vessel?
A.
A manual that gives instructions on the operation of the DP system.
B.
A document which highlights failure modes of the DP system and their effects on operation.
C.
Company procedures for carrying out DP operations
D.
Emergency procedures to deal with DP failures.
92.
Should there be a severe system failure, such as the total loss of position or heading input to the system, a software function will maintain thruster output settings. This function is called:
A.
Model control or Dead Reckoning mode.
B.
Aerodynamic model.
C.
Thrust Allocation
D.
Wind feed forward.
93.
If a DP system component fails, the loss of position and/or heading can be prevented by:
A.
Higher speed computers.
B.
The provision of redundancy.
C.
Calibration tests.
D.
More reliable processors.
94.
A DP Class 1 vessel
A.
Is not able to maintain position automatically.
B.
Have at least two computers.
C.
Has the highest standard of system redundancy available.
D.
May lose position and/or heading of a single component in the DP system fails.
95.
The online Consequence Analysis function:
A.
Determines the risk in the OP-planning process.
B.
Required for Class 1, 2, and 3 vessels.
C.
Verifies continued thruster and power redundancy for Of Class 2 and 3 vessels.
D.
Calculates the vessel's capability to hold position in various wind conditions.
96.
Under which DP vessel Equipment Class is it possible that loss of position may occur in the event of a single fault?
A.
Class 1.
B.
Class 2,
C.
Class 3.
D.
None of them.
97.
In a Hydroacoustic Position Reference (HPR) System, a Responder Beacon is a device which:
A.
Is Interrogated through water and replies through water.
B.
Sends continuous acoustic pulses from the sea floor.
C.
Is interrogated by electrical signal through cable, replying through water.
D.
Is interrogated through water and replies via cable.
98.
What has a major negative effect on sound propagation in water when using an Hydroacoustic Position Reference (HPR) system?
A.
Seabed topography.
B.
Thruster noise.
C.
Water pressure.
D.
Water salinity.
99.
What is a Capability Diagram?
A.
The capability of the ship concerning the DP-classes.
B.
A tool for estimating the position-keeping capability of the ship.
C.
The time interval for plotting the vessel's position on the screen.
D.
A history track of the vessel's positions showing the vessels offset.
100.
For DP operations, how much settling time in Auto Position mode should normally be allowed before commencing work?
