QUIZ 4
1.
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
2. When using the HPR, what information should you pay attention to?
a.GPS
b.Gyro
c.VRS
d.Tension sensor
3. 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
4. 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
5. 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
6. 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
7. When using a taut wire, what should you consider?
a.Working Depth
b.Transponder frequency
c.Nature of Seabed
d.Transponder location
8. 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
9. 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
10. 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
11. 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
12. 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
13. 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
14. 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
15. 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
16. Which of the following inputs are required, as a minimum, to achieve automatic DP
control?
a.PRS
b.Current
c.Draft
d.Hawser
e.Gyro
17. Which of the following constitute DP control?
Pitch
Yaw
Roll
Heave
Sway
Surge
18. 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
19. 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
20. Which two of the following situations would you deselect the wind sensors?
a.Working on the Leeside of a platform
b.Carrying out diving operations
c.Working on the windward side of a platform
d.Carrying out Helicopter Operations
21. 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
22. 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
23. Which of the following are local position reference systems?
a.Radius
b.GNSS
c.HiPap
d.GLONASS
e.Artemis
f.Taut wire
24. 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
25. When using a Fanbeam, what potential hazards should you pay attention to?
a.Wire Length
b.Bright flashing lights
c.Frequency
d. Crane work
