System Components & Functions Flashcards
7 cards from real DPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 System Components & Functions flashcards as text
What is the purpose of the 'gain' settings adjusted by the DP operator?
Answer: Control how aggressively the DP system responds to position errors
Gain settings determine the sensitivity of the DP controller's response; higher gains produce faster corrections but may cause thruster oscillation, while lower gains give smoother but slower response.
In a DP system, what is the function of the 'dead band'?
Answer: A small range of position error within which thrusters are not activated
The dead band is a small tolerance zone around the setpoint within which no corrective thruster action is taken, reducing unnecessary thruster activity and wear.
A taut wire position reference system determines vessel position by measuring:
Answer: The angle and length of a wire descending to a clump weight on the seabed
A taut wire system measures the angle (azimuth and elevation) and deployed length of a wire running from the vessel to a heavy clump weight resting on the seabed to calculate vessel position.
What does a Power Management System (PMS) automatically do when a large thruster is started?
Answer: Shut down non-essential consumers to prevent voltage collapse
The PMS monitors power demand and sheds non-essential loads or starts additional generators when a large consumer like a thruster starts, preventing voltage and frequency collapse.
Which DP class notation requires that a single failure, including loss of a compartment, cannot cause loss of position?
Answer: DP Class 3
DP Class 3 (IMO Equipment Class 3) requires that even a catastrophic failure such as fire or flooding of a compartment cannot cause loss of DP capability, requiring physical separation of redundant systems.
What is the primary function of an Inertial Navigation System (INS) when used as a DP position reference?
Answer: Bridge gaps in other reference systems using accelerometer and gyroscope data
An INS uses accelerometers and gyroscopes to continuously calculate position by integrating acceleration over time, providing short-term position continuity when other references drop out.
In DP system redundancy design, what is the purpose of a 'consequence analysis' function?
Answer: Simulate the effect of a defined failure and warn if position keeping would be lost
Consequence analysis continuously simulates the worst-case defined failure and alerts the operator if the resulting reduced capability would be insufficient to maintain position in current conditions.