OCTCO/OCTF exit exam questions and answers — Set 23 — Oil and Chemical Tanker Cargo Operations
Set 23 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 23 — 30 OCTCO/OCTF exit exam questions with answers
1. Oil or grease must never be used on the valves and fittings of an oxygen resuscitator because:
- A. Oil contaminates the casualty's lungs
- B. Oxygen freezes the grease
- C. Grease makes the mask too slippery
- D. Oil and grease can ignite violently in contact with high-pressure oxygen
2. For lifting an injured person vertically out of a pump room or tank, the most suitable stretcher is:
- A. A folding chair
- B. An inflatable mattress
- C. A rigid stretcher that secures the casualty, such as a Neil Robertson type
- D. A canvas sheet held by four people
3. SOLAS requires that cargo pump rooms on tankers be provided with a system for:
- A. Continuous monitoring of noise levels
- B. Monitoring the cargo tank ullages
- C. Automatic sprinkling with fresh water
- D. Continuous monitoring of the concentration of hydrocarbon gases
4. Before entering a hazardous atmosphere wearing SCBA, the wearer should check that:
- A. The mask is worn over a beard to improve the seal
- B. The face mask fits and seals properly and the cylinder is adequately charged
- C. The low-pressure whistle has been disconnected
- D. The cylinder valve is only half open
5. An infrared gas analyser is preferred over a catalytic instrument for measuring hydrocarbon content in an inerted tank because it:
- A. Does not need oxygen to measure the gas
- B. Measures oxygen and hydrocarbon together on one sensor
- C. Reads only in ppm
- D. Requires no calibration ever
6. Escape routes from the pump room and the tank evacuation equipment should be:
- A. Locked to prevent unauthorised use
- B. Kept clear and ready for immediate use
- C. Stored in the bosun's store away from the work area
- D. Used for storing spare equipment
7. SOLAS regulation XI-1/7 requires ships to carry an appropriate portable atmosphere testing instrument capable of measuring at least:
- A. Oxygen, flammable gases or vapours, hydrogen sulphide and carbon monoxide
- B. Nitrogen, argon and helium
- C. Oxygen and carbon dioxide only
- D. Benzene only
8. Under SOLAS chapter III, enclosed space entry and rescue drills must be carried out at least:
- A. Every week
- B. Every five years
- C. Every two months
- D. Every year
9. According to ISGOTT, before entry into an enclosed space without breathing apparatus, toxic gas concentrations must be less than:
- A. 50% of their occupational exposure limit (OEL)
- B. 10 ppm for every gas
- C. 100% of their OEL
- D. The lower flammable limit
10. During entry into an enclosed space, the attendant stationed at the entrance should:
- A. Maintain communication with those inside and raise the alarm without entering if there is a problem
- B. Switch off the ventilation to save power
- C. Enter immediately to help if a person collapses
- D. Leave the entrance once the entrants are inside
11. While personnel are working inside a cargo tank, the atmosphere should be:
- A. Ventilated continuously and re-tested at regular intervals
- B. Inerted to keep it safe
- C. Left without ventilation to avoid stirring residues
- D. Tested only once before entry
12. Before repair or maintenance work on a cargo pump in the pump room, the pump and its system should be:
- A. Drained, isolated (locked and tagged out) and gas freed
- B. Pressurised with inert gas
- C. Run at low speed during the work
- D. Left connected to the cargo tank so it can be tested
13. The purpose of lock-out/tag-out before maintenance in a gas-dangerous area is to:
- A. Record the time spent on the work
- B. Lock the pump room door against visitors
- C. Allow the work to be done without a permit
- D. Prevent equipment being started or valves being opened while work is in progress
14. According to ISGOTT, hot work in the cargo area of a tanker should only be permitted when the combustible gas concentration in the work area is:
- A. Less than 1% of the LFL
- B. Less than 50% of the LFL
- C. Less than 10% of the LFL in the tank bottom only
- D. Below the UFL
15. After completion of hot work on a tanker, the fire watch should:
- A. Leave immediately the welding stops
- B. Open all adjacent tank lids
- C. Remove the fire extinguishers at once
- D. Remain at the site for a period to check that no smouldering or fire has developed
16. In hazardous area classification, a Zone 0 area is one in which:
- A. An explosive atmosphere is not likely and only for short periods
- B. No explosive atmosphere can ever occur
- C. An explosive atmosphere is likely only occasionally in normal operation
- D. An explosive gas atmosphere is present continuously or for long periods
17. In hazardous area classification, an area where an explosive gas atmosphere is likely to occur occasionally in normal operation is classed as:
- A. Zone 1
- B. A safe area
- C. Zone 2
- D. Zone 0
18. Electrical equipment of protection type 'Ex p' (pressurised) prevents ignition by:
- A. Maintaining a protective gas or air inside the enclosure at a pressure above the surrounding atmosphere
- B. Containing any internal explosion within a strong enclosure
- C. Limiting circuit energy so no spark can ignite the gas
- D. Immersing the parts in oil
19. Before opening or repairing electrical equipment located in a gas-dangerous area, it must be:
- A. Isolated from the power supply and the area confirmed gas free under a permit
- B. Tested live to locate the fault
- C. Earthed through the cargo pipeline
- D. Covered with a wet cloth
20. Equipment made of aluminium or aluminium paint should not be dragged or struck against rusty steel in the cargo area because:
- A. It generates toxic gas
- B. Rust damages the aluminium paint only
- C. Aluminium becomes magnetised
- D. The impact can produce an incendive (thermite) spark
21. If hot work or enclosed space work is interrupted, for example for a meal break, before work resumes:
- A. The space must be inerted
- B. Only the Master's verbal permission is needed
- C. The permit automatically remains valid for 24 hours without checks
- D. The atmosphere must be re-tested and the permit conditions re-confirmed
22. Persons entering an enclosed space on a tanker should never:
- A. Keep in communication with the attendant
- B. Wear a personal gas monitor
- C. Enter alone without an attendant and an approved permit
- D. Carry an approved intrinsically safe torch
23. Under SOLAS II-2/10.8, on tankers fitted with an inert gas system, the deck foam system must have sufficient foam concentrate to produce foam for at least:
- A. 20 minutes
- B. 60 minutes
- C. 5 minutes
- D. 10 minutes
24. One of the criteria for the rate of foam solution supply of a deck foam system is not less than:
- A. 0.1 litres per minute per square metre of cargo deck area
- B. 60 litres per minute per square metre of cargo deck area
- C. 0.6 litres per minute per square metre of cargo deck area
- D. 6 litres per minute per square metre of cargo deck area
25. Under the FSS Code, the distance from a deck foam monitor to the farthest extremity of the area it protects must not exceed:
- A. 50 metres in all cases
- B. 75% of the monitor throw in still air
- C. 25% of the monitor throw
- D. 100% of the monitor throw
26. Under the FSS Code, each portable foam applicator on a tanker deck foam system must have a capacity of at least:
- A. 50 litres per minute
- B. 1,250 litres per minute
- C. 100 litres per minute
- D. 400 litres per minute of foam solution
27. For fires involving water-soluble polar solvents such as alcohols and ketones, the correct foam is:
- A. Ordinary protein foam
- B. Alcohol-resistant foam
- C. Any foam, since all foams are equally effective
- D. High-expansion foam made with sea water only
28. Dry chemical powder is very effective at knocking down a flash fire, but the main disadvantage is that:
- A. It reacts violently with oil
- B. It cannot be used on deck
- C. It has little cooling effect, so the fire may re-ignite from hot surfaces
- D. It conducts electricity
29. If a fire breaks out on deck during cargo operations alongside a terminal, the ship's immediate actions should include:
- A. Continue cargo operations to empty the tanks quickly
- B. Wait for the terminal fire brigade before taking action
- C. Raise the alarm, stop cargo operations, close valves and inform the terminal
- D. Disconnect hoses before raising the alarm
30. Foam should not be used on live electrical equipment because:
- A. Foam is too light to cover the equipment
- B. Foam contains water and conducts electricity
- C. Foam reacts chemically with copper
- D. Foam has no smothering effect
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