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OCTCO/OCTF exit exam questions and answers — Set 2

Set 2 of the Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF) exit exam bank — 30 of 252 questions, with the correct option marked and a one-line explanation for every one. Read it end to end, jump to a single set, or search it — then sit the same bank as a timed paper. The real DG Shipping exit exam is 30 marks with 15 to pass.

These are the bank's original groupings. Practising deals the whole bank out again every time you reshuffle, so a practice “Set 3” is a different 30 questions each time — the set numbers below are the source file's, and are only used here so the key stays navigable. Options are listed in their original order with fixed letters; when you practise, those move too.

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Set 2 — 30 OCTCO/OCTF exit exam questions with answers

1. What is the function of Oil Record Book (Part II) on oil tankers?

  • A. Mandatory log of cargo operations, ballasting, COW, slop discharges, and ODMCS
  • B. Food inventory
  • C. Overtime record
  • D. Engine oil log
Answer: A — Mandatory log of cargo operations, ballasting, COW, slop discharges, and ODMCS
Oil Record Book Part II logs all cargo/ballast operations on tankers under MARPOL.

2. What type of pump is most commonly used as main cargo pump on crude oil tankers?

  • A. High-capacity steam turbine or motor driven centrifugal pump
  • B. Gear pump
  • C. Hand piston pump
  • D. Diaphragm pump
Answer: A — High-capacity steam turbine or motor driven centrifugal pump
Centrifugal cargo pumps provide high volume transfer rates (1500 to 5000 m3/h).

3. What safety feature is mandatory on cargo pump room ventilation systems?

  • A. Air recirculation
  • B. Continuous extraction ventilation (at least 20 air changes per hour) under negative pressure
  • C. Small fan
  • D. No ventilation
Answer: B — Continuous extraction ventilation (at least 20 air changes per hour) under negative pressure
Extraction fans draw heavy petroleum vapors from floor level, keeping pump room safe.

4. What is auto-ignition temperature of a flammable liquid?

  • A. Vacuum boiling point
  • B. Sea temp
  • C. Lowest temperature at which vapor ignites spontaneously without external spark
  • D. Freezing point
Answer: C — Lowest temperature at which vapor ignites spontaneously without external spark
Hot engine exhaust pipes above auto-ignition temp can ignite cargo leaks without a spark.

5. How frequently must operational drills and practical checks for regulatory compliance and STCW code requirements be conducted for Basic Oil & Chemical Tanker?

  • A. At least monthly or as mandated by SOLAS and shipboard safety management system (SMS)
  • B. Once every 5 years during special survey
  • C. Only when requested by port State control inspectors
  • D. Annually prior to vessel drydocking
Answer: A — At least monthly or as mandated by SOLAS and shipboard safety management system (SMS)
Regular drills maintain crew emergency readiness and satisfy SOLAS requirements.

6. What documented record must be maintained on board following completion of tasks related to regulatory compliance and STCW code requirements in Basic Oil & Chemical Tanker?

  • A. No written record is required
  • B. Entry in the official Deck or Engine Logbook recording date, time, and operational parameters
  • C. Verbal update to port agent without logging
  • D. Unsigned note on the shipboard notice board
Answer: B — Entry in the official Deck or Engine Logbook recording date, time, and operational parameters
Official logbook entries provide mandatory legal documentation of shipboard safety tasks.

7. What is the purpose of flame screens fitted on tank vent outlets?

  • A. Keep birds out
  • B. Prevent passage of external sparks/flames into cargo tank vapor space
  • C. Stop liquid splash
  • D. Filter dust
Answer: B — Prevent passage of external sparks/flames into cargo tank vapor space
Fine wire gauze dissipates flame heat below ignition temperature, stopping flame entry.

8. What does SOPEP stand for?

  • A. Standard Operational Protocol
  • B. Shipboard Oil Pollution Emergency Plan
  • C. System for Oil Prevention
  • D. Safety Officer Program
Answer: B — Shipboard Oil Pollution Emergency Plan
SOPEP is a mandatory onboard plan detailing emergency responses to oil spills.

9. What is ullage in a cargo tank?

  • A. Distance from liquid surface up to reference point at top of sounding pipe
  • B. Engine room air volume
  • C. Total cargo weight
  • D. Depth of liquid
Answer: A — Distance from liquid surface up to reference point at top of sounding pipe
Ullage measures empty height above liquid level; Sounding measures liquid height from bottom.

10. Why must cargo manifolds be fitted with blank flanges bolted with full set of bolts when not in use?

  • A. Provide positive secondary liquid/vapor containment against valve leakage
  • B. Keep manifold painted
  • C. Weight balance
  • D. Improve appearance
Answer: A — Provide positive secondary liquid/vapor containment against valve leakage
Blank flanges with complete bolting prevent accidental oil spills if valves seep.

11. What is the primary cause of sloshing damage in partially filled cargo tanks?

  • A. Pump suction
  • B. Inert gas fan vibration
  • C. High cargo temp
  • D. Violent movement of liquid cargo creating severe dynamic impact pressures against bulkheads
Answer: D — Violent movement of liquid cargo creating severe dynamic impact pressures against bulkheads
Sloshing forces in partially filled slack tanks can damage internal bulkheads and heating coils.

12. What equipment measures oil content in water discharging from bilges or slop tanks?

  • A. Thermometer
  • B. Flow meter
  • C. Tachometer
  • D. Oil Content Meter (OCM) / 15 ppm alarm
Answer: D — Oil Content Meter (OCM) / 15 ppm alarm
OCMs monitor oil concentration in discharge water under MARPOL limits.

13. What precaution must be observed when taking manual oil soundings on an inerted tanker?

  • A. Use nylon rope
  • B. Use vapor-lock valves and metallic sounding tapes properly grounded/bonded to ship structure
  • C. Open main hatch wide
  • D. Stand barefoot
Answer: B — Use vapor-lock valves and metallic sounding tapes properly grounded/bonded to ship structure
Grounding sounding tapes prevents static sparks inside cargo vapor spaces during dips.

14. What is the function of cargo tank heating coils on oil tankers?

  • A. Wash tank walls
  • B. Boil cargo into gas
  • C. Cool down cargo
  • D. Maintain cargo temperature to reduce viscosity for efficient pumping
Answer: D — Maintain cargo temperature to reduce viscosity for efficient pumping
Steam/thermal heating coils keep heavy oils liquid above their pour point for easy pumping.

15. What is a Segregated Ballast Tank (SBT)?

  • A. Engine sump
  • B. Drinking water tank
  • C. Slop tank
  • D. Ballast tank completely separate from cargo oil system, filled only with clean sea water
Answer: D — Ballast tank completely separate from cargo oil system, filled only with clean sea water
SBT systems prevent seawater contamination by keeping ballast completely isolated from cargo.

16. What condition requires immediate stopping of oil cargo transfer?

  • A. Sunset
  • B. Cargo spill on deck, manifold valve leakage, sudden pressure drop, or lightning storm
  • C. Radio broadcast start
  • D. Change of steering helm
Answer: B — Cargo spill on deck, manifold valve leakage, sudden pressure drop, or lightning storm
Any containment failure or atmospheric hazard requires immediate operational shutdown.

17. What type of personal protective equipment (PPE) is essential when handling regulatory compliance and STCW code requirements under Basic Oil & Chemical Tanker guidelines?

  • A. Standard street clothing with rubber gloves
  • B. Basic cotton coveralls without eye or foot protection
  • C. High-visibility vest only
  • D. Certified task-specific PPE meeting SOLAS/IMO performance standards
Answer: D — Certified task-specific PPE meeting SOLAS/IMO performance standards
Approved PPE protects personnel against specific physical and chemical hazards.

18. What parameter must be verified prior to authorizing enclosed space entry for regulatory compliance and STCW code requirements related to Basic Oil & Chemical Tanker?

  • A. Oxygen level at 15% with ventilation turned off
  • B. Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration
  • C. Temperature check only
  • D. Visual inspection through access hatch without gas testing
Answer: B — Atmospheric oxygen level at 20.9% and zero toxic/flammable gas concentration
Enclosed space safety requires verified atmospheric gas testing prior to entry.

19. What is the Lower Explosive Limit (LEL) of typical crude oil hydrocarbon vapors in air?

  • A. 20%
  • B. 50%
  • C. Approximately 1% by volume
  • D. 0.01%
Answer: C — Approximately 1% by volume
Crude oil vapors become flammable at ~1% LEL and reach Upper Explosive Limit at ~10%.

20. What is the role of an Oil Spill Removal Organization (OSRO)?

  • A. Provide containment booms, skimmers, and professional cleanup assistance
  • B. Inspect engine certificates
  • C. Operate cargo pumps
  • D. Issue bill of lading
Answer: A — Provide containment booms, skimmers, and professional cleanup assistance
OSRO contractors provide specialized spill response hardware and cleanup operations.

21. Why is water prohibited as an extinguishing agent directly on liquid oil pool fires?

  • A. Water turns oil to gas
  • B. Water is heavier than oil; oil floats on top and spreads burning liquid over wider area
  • C. Water freezes oil
  • D. Water generates oxygen
Answer: B — Water is heavier than oil; oil floats on top and spreads burning liquid over wider area
Water streams sink below burning oil, causing violent boiling and fire spread. Foam is used.

22. What fire extinguishing system is standard protection for oil tanker cargo deck areas?

  • A. CO2 gas flooding open deck
  • B. Sprinkler fresh water
  • C. Fixed Deck Foam System (Low expansion foam)
  • D. Halon gas
Answer: C — Fixed Deck Foam System (Low expansion foam)
Deck foam monitors smother liquid fuel surface fires by sealing off flammable vapors from air.

23. What is the purpose of ballast water exchange (BWE) under BWM Convention?

  • A. Cool deck
  • B. Replace coastal ballast water with open-ocean deep sea water to prevent invasive species transfer
  • C. Clean fuel tanks
  • D. Wash cargo lines
Answer: B — Replace coastal ballast water with open-ocean deep sea water to prevent invasive species transfer
Ballast exchange in deep sea (>200 nm, 200m depth) eliminates coastal invasive marine pests.

24. What device measures ullage, oil/water interface level, and temperature with a single portable probe?

  • A. MMC / UTI (Ullage-Temperature-Interface) portable tape
  • B. Wooden dipstick
  • C. Glass thermometer
  • D. Hydrometer
Answer: A — MMC / UTI (Ullage-Temperature-Interface) portable tape
UTI tapes attach to vapor locks, sounding liquid surface, oil-water interface, and temperature.

25. What is gas freeing on an oil tanker?

  • A. Heating cargo
  • B. Closing all vents
  • C. Filling tank with crude
  • D. Replacing hydrocarbon or inert gas in cargo tanks with fresh breathable air
Answer: D — Replacing hydrocarbon or inert gas in cargo tanks with fresh breathable air
Gas-freeing uses high-capacity blowers to introduce fresh air after purging hydrocarbons with inert gas.

26. What risk occurs if a cargo pump is run dry without liquid flow?

  • A. Paint peeling
  • B. Deck freezing
  • C. Electrical short circuit
  • D. Overheating of mechanical seals and bearings, causing fire hazard or pump seizure
Answer: D — Overheating of mechanical seals and bearings, causing fire hazard or pump seizure
Cargo pumps rely on liquid flow for cooling; dry running causes rapid frictional heating.

27. What publication specifies standard communication signals between ship and tugs during berthing?

  • A. Medical Guide
  • B. Standard Marine Communication Phrases (SMCP) / Port Berthing Plan
  • C. Cookery Guide
  • D. Engine Telegraph Manual
Answer: B — Standard Marine Communication Phrases (SMCP) / Port Berthing Plan
SMCP ensures standardized clear VHF communication between pilot, master, tugs, and mooring crew.

28. Who has ultimate responsibility for the safety of cargo operations and environmental compliance on an oil tanker?

  • A. Shore pump operator
  • B. Customs inspector
  • C. The Ship's Master
  • D. Port Agent
Answer: C — The Ship's Master
The Master retains overarching responsibility for overall safety, vessel seaworthiness, and MARPOL compliance.

29. What key responsibility belongs to seafarers performing watchkeeping duties for regulatory compliance and STCW code requirements under Basic Oil & Chemical Tanker?

  • A. Leaving watchkeeping station unattended
  • B. Operating equipment beyond design pressure limits
  • C. Bypassing safety trips during routine operations
  • D. Continuous monitoring of operational parameters and immediate reporting of anomalies
Answer: D — Continuous monitoring of operational parameters and immediate reporting of anomalies
Continuous vigilance and prompt communication are core watchkeeping duties under STCW.

30. Which document contains detailed hazard data and emergency handling instructions for substances involved in regulatory compliance and STCW code requirements during Basic Oil & Chemical Tanker?

  • A. Ship's Cargo Manifest summary page
  • B. Bill of Lading description
  • C. Safety Data Sheet (SDS) / Material Safety Data Sheet (MSDS)
  • D. Crew List document
Answer: C — Safety Data Sheet (SDS) / Material Safety Data Sheet (MSDS)
Safety Data Sheets provide critical hazard identification, PPE requirements, and first aid response steps.

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