OCTCO/OCTF exit exam questions and answers — Set 11 — Oil and Chemical Tanker Cargo Operations
Set 11 of the Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF) exit exam bank — 30 of 802 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 11 — 30 OCTCO/OCTF exit exam questions with answers
1. What should you do to reduce the accumulation of static electricity while loading petroleum products?
- A. Increase the air flow into the tank
- B. Use the overall method of loading only
- C. Start loading slowly
- D. Start loading at maximum pressure
2. Each pressure gauge used in an oil transfer operation must be accurate to within what percentage?
- A. 1%
- B. 3%
- C. 5%
- D. 10%
3. If a cargo of kerosene vapour is considered too lean to explode, it must be ____.
- A. Above the explosive range
- B. Within the explosive range
- C. Below the explosive range
- D. Above the lower explosive limit
4. Your vessel is taking on cargo oil when a small leak develops in the hose. You order pumping stopped. What action should you take before you resume pumping?
- A. Place a large drip pan under the leak and plug the scuppers
- B. Notify the terminal superintendent
- C. Repair the hose with a patch
- D. Replace the hose
5. The condition of asphyxia arises from which of the following?
- A. An inadequate supply of oxygen
- B. Too much oxygen
- C. Sleep deprivation
- D. Improper calorific intake
6. How does an inert gas system on a tanker function to prevent explosions in cargo tanks?
- A. It de-energises the charged mist effect
- B. It reduces the oxygen content of the tank atmosphere below the level that supports combustion
- C. It filters out the flammable vapours from the cargo tank spaces
- D. It maintains a positive pressure on the vent header to cool the flammable vapours
7. Oil product samples should be taken at the commencement and completion of loading. As the person in charge, where should the final samples be taken?
- A. The shoreline low points
- B. The vessel's cargo tanks
- C. The shore tank discharge
- D. The dock riser
8. On tankers with manually operated tank valves, which type of valve is most commonly used?
- A. Globe valve
- B. Check valve
- C. Butterfly valve
- D. Gate valve
9. Which term best describes the measurement taken from the tank top down to the level of the liquid?
- A. Freeboard
- B. Thievage
- C. Innage
- D. Ullage
10. During oil transfer operations, who is responsible for ensuring that the posted transfer procedures are being followed?
- A. The senior able seaman
- B. The designated person in charge
- C. The tankerman
- D. The oiler
11. When the inert gas system is temporarily unable to maintain a positive pressure or an oxygen content of less than 8%, how should cargo operations be adjusted?
- A. Operations should continue at a slower rate until the requirements are met
- B. Operations should continue only under emergency procedures
- C. Operations should be shut down immediately
- D. Operations should be monitored more frequently
12. What is the maximum allowable oxygen content within a ship's cargo tanks, inert gas piping and vapour recovery system?
- A. 4%
- B. 5%
- C. 8%
- D. 10%
13. Which factor must be considered when deciding the order of loading dissimilar products through the same piping system on a tanker?
- A. Contamination of the cargo
- B. Reid vapour pressures
- C. Flash points
- D. Specific gravities
14. What is the purpose of the relief valve on a cargo pump?
- A. To allow two or more tanks to be filled at the same time
- B. To return cargo to the suction side of the pump
- C. To provide emergency shutdown of the pump
- D. To remove vapours from the pump
15. Where is a cargo fire most likely to occur on a tanker?
- A. At the vent header
- B. At the main deck manifold
- C. In the midships house
- D. In the cargo pump room
16. Which term refers to the depth of a petroleum product in a tank?
- A. Thievage
- B. Innage
- C. Outage
- D. Ullage
17. What is meant by thieving a petroleum cargo?
- A. Siphoning off a few barrels for shipboard use
- B. Reducing gross cargo figures to net amounts
- C. Determining the amount of water, if any, in each cargo tank
- D. Adjusting the cargo figures to coincide with the draught
18. Which of the following will prevent a flammable atmosphere from occurring in a cargo tank of a tank vessel?
- A. A combustion stabiliser
- B. An oxidiser
- C. Inert gas
- D. A vortex eliminator
19. On a tanker, what is the required capacity of the inert gas system compared with the total capacity of all cargo pumps that can be operated simultaneously?
- A. 50%
- B. 75%
- C. 100%
- D. 125%
20. On tankers using manually operated tank valves, what does the deck hand wheel indicator register?
- A. The exact lift position of the valve disc through 100% of its operation
- B. The oxygen content of the tank
- C. The approximate number of turns the tank valve has been opened
- D. The level of oil in the tank
21. While loading bulk oil, you notice oil on the water near the barge. Which action should you carry out FIRST?
- A. Notify the terminal superintendent
- B. Search the vessel for leaks
- C. Stop loading
- D. Notify the Coast Guard
22. In an inert gas or vapour collection system, the high pressure alarm must sound at what percentage of the lowest relief valve setting?
- A. 70%
- B. 80%
- C. 90%
- D. 95%
23. Which of the following is NOT a precaution to be taken when topping off?
- A. Notify the engine room of the procedure
- B. Give the operation your undivided attention
- C. Maintain communications with the dock man
- D. Reduce the loading rate
24. When loading bulk liquid cargo, what is the FIRST action you should take if a cargo valve jams open?
- A. Run out the vessel or terminal fire hose
- B. Call the owner, operator or terminal supervisor
- C. Trip the pump relief valve
- D. Order the dock man to shut down
25. If you observe any situation that presents a safety or pollution hazard during fuel transfer operations, which action should you take FIRST?
- A. Shut down the operation
- B. Notify the person in charge of the shore facility
- C. Sound the general alarm
- D. Close the valves at the manifold
26. What is the pipe used to connect two separate piping systems on a tank vessel called?
- A. Junction
- B. Connection
- C. Crossover
- D. Transfer
27. Which of the following is equivalent to one barrel, a unit of liquid measure?
- A. 45 US gallons at 75°F
- B. 43 US gallons at 65°F
- C. 42 US gallons at 60°F
- D. 40 US gallons at 50°F
28. What is the lowest temperature at which a liquid gives off sufficient vapour to form a flammable mixture with air?
- A. Flash point
- B. Threshold limit value
- C. Fire point
- D. Lower explosive limit
29. What does the MARPOL 73/78 Convention deal with?
- A. Standards of training, certification and watchkeeping
- B. Prevention of pollution from ships
- C. Safety of life at sea
- D. Construction and equipment of gas carriers
30. For what purpose is span gas used?
- A. To ensure an inert atmosphere while a system is brought from a flammable to a dry air condition
- B. To calibrate a gas analyser so that it indicates correct gas concentrations
- C. To describe a gas state when vapour temperature equals liquid temperature
- D. To find the zero point on a gas analyser
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