Blueprint Reading & Interpretation 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 Blueprint Reading & Interpretation flashcards as text
On a DP reference system blueprint, a DGPS antenna symbol connected to a junction box with multiple outputs most likely represents:
Answer: A shared GPS signal distributed to multiple DP computers
Junction boxes with multiple outputs on reference system drawings indicate signal splitting, allowing one physical sensor to feed several DP controllers for redundancy.
In a DP hydraulic thruster blueprint, a relief valve symbol is positioned to:
Answer: Bypass flow when system pressure exceeds a set limit
Relief valves open to divert fluid when pressure exceeds the design limit, protecting the hydraulic circuit from overpressure damage.
A DP electrical drawing uses the abbreviation 'AMS' next to a switchboard. What does AMS stand for in this context?
Answer: Alarm Monitoring System
AMS refers to the Alarm Monitoring System, which supervises vessel machinery and alerts operators to abnormal conditions.
On a DP system P&ID, 'FT' adjacent to a flow line with a circle symbol stands for:
Answer: Flow Transmitter
FT is the ISA standard tag for Flow Transmitter, a device that measures flow rate and sends a proportional signal to the control system.
Which line weight convention is most commonly used in DP electrical blueprints to indicate a main power cable versus a control cable?
Answer: Power cables are drawn with a thicker or bolder line; control cables are thinner
Standard electrical drawing practice uses heavier line weights for main power conductors to visually distinguish them from lighter control wiring.
A DP blueprint revision block shows 'Rev C – Added thruster 5 isolation valve.' What is the correct action before using this drawing operationally?
Answer: Verify the physical installation matches Rev C before relying on it
Before relying on any revised drawing operationally, the operator must confirm the physical equipment matches the updated revision to avoid acting on inaccurate information.
In a DP system wiring diagram, terminal strip labels such as 'TB1-14' indicate:
Answer: Terminal block 1, terminal number 14
TB followed by a number identifies the terminal block, and the second number specifies the individual terminal position within that block.