Quality Control & Inspection 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 Quality Control & Inspection flashcards as text
Under DNV class rules for DP vessels, what is the minimum frequency for conducting an Annual DP Trial?
Answer: Every 12 months, not exceeding 15 months
DNV and most class societies require DP annual trials every 12 months but permit a maximum extension to 15 months under certain survey alignment conditions.
During inspection of an HPR (Hydro-acoustic Position Reference) system, the operator notices the vessel's own acoustic emissions are causing multipath interference. The most appropriate quality control response is to:
Answer: Identify and suppress the interfering onboard noise source or change the HPR frequency
Multipath from onboard noise sources degrades HPR accuracy; the correct fix is to identify the source, reduce it, or change frequency to minimize interference.
When performing a quality check on an Environmental Monitoring System (EMS) used for DP operations, which parameter is MOST critical to verify is accurately measuring and reporting?
Answer: Current speed and direction at operating depth
Current speed and direction at operating depth is the most critical EMS parameter because it directly affects DP thruster demand and may not be accounted for by other sensors.
An inspection of a DP2 vessel reveals that both independent DP control systems share a common network switch. This configuration:
Answer: Violates the requirement for physical separation of redundant DP control systems
A common network switch is a single point of failure that violates the physical redundancy required between the independent DP control systems on a DP2 vessel.
During a quality audit, a DP Operator's logbook entry states 'DP operations conducted normally' for an 8-hour offshore loading operation. This entry is non-conformant because:
Answer: It lacks the specific operational data required by IMCA and industry standards including reference systems used, weather, and any alarms or events
IMCA guidelines require DP logs to capture specific operational parameters; a generic entry fails to meet the evidence standard needed for quality assurance and incident investigation.
When inspecting the DP failure mode documentation after a thruster defect is repaired, what quality step is mandatory before returning the vessel to full DP operations?
Answer: Conduct a function test of the repaired thruster and update the FMEA deviation register to close the outstanding defect
A function test confirms the repair is effective, and updating the FMEA deviation register ensures the quality management record accurately reflects restored equipment status.
A quality inspection of a DP vessel's power management system (PMS) interaction with DP reveals that the PMS is set to trip a running generator on overload rather than shed non-essential loads first. This setting:
Answer: Is a quality defect that could cause power reduction or blackout during DP operations when thrusters demand peak power
The PMS should be configured to shed non-essential loads before tripping generators, as a generator trip during peak thruster demand can cascade into a blackout and DP drive-off.