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OCTCO/OCTF exit exam questions and answers — Set 3

Set 3 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 3 — 30 OCTCO/OCTF exit exam questions with answers

1. What is the alternative means of supply of sea water to the deck seal unit in case of maintenance or failure of designated deck seal Pump?

  • A. Through the deck fire line
  • B. Through the main sea water pump or the cargo condenser pump
  • C. Through the deck seal pump fitted in the engine room
  • D. Through a sea water aggregate pump fixed on the cargo deck
Answer: B — Through the main sea water pump or the cargo condenser pump
If the designated deck seal pump fails or is undergoing maintenance, sea water supply to the inert gas deck seal can be alternatively lined up from the main sea water service line or cargo condenser cooling pump.

2. Expand the abbreviation 'ESD' system?

  • A. Emergency stop and disconnect system
  • B. Emergency shut down system
  • C. Emergency shore disconnection system
  • D. Emergency shutting and disconnecting system
Answer: B — Emergency shut down system
ESD stands for Emergency Shut Down system, which is designed to safely stop cargo transfer operations in the event of an emergency.

3. Chapter 4 MARPOL annex VI was adopted on?

  • A. 17th August 2009
  • B. 1st March 2012
  • C. 1St January 2010
  • D. 15th July 2011
Answer: D — 15th July 2011
Chapter 4 of MARPOL Annex VI (Regulations on energy efficiency for ships, including EEDI and SEEMP) was adopted on 15th July 2011 under Resolution MEPC.203(62).

4. A centrifugal bilge pump requires priming?

  • A. In order to overcome the potential energy of water in the discharge line.
  • B. Primarily to lubricate the shaft.
  • C. Due to the inability of this type of pump to lift water to cover the suction(eye)) of the empeller.
  • D. To initially unload the pump by having its head pressure equal to discharge pressure
Answer: C — Due to the inability of this type of pump to lift water to cover the suction(eye)) of the empeller.
Centrifugal pumps are not self-priming because they cannot create a sufficient vacuum with air/vapour to draw liquid into the impeller eye; hence, priming is required to fill the casing and suction.

5. A scrubber tower which is normally acts as a _____.

  • A. Heater
  • B. Cooler
  • C. Humidifier
  • D. Dehumidifier
Answer: B — Cooler
The scrubber tower cools the hot flue gas from the boiler by direct contact with seawater spray and removes sulphur dioxide (SO2) and soot particles.

6. On many modern VLCC tankers which of the following device is used to top up IG pressure on loaded condition in case of slight reduce in tank temperature.

  • A. Supplement IG by the boiler and standard method.
  • B. Do not fire the main boiler plant due to excess fuel consumption which is more than allowed in the agreement
  • C. A separate IGG plant if installed separately
  • D. Wat till the discharge port, open tank vent to allow a little rise in tank pressure.
Answer: A — Supplement IG by the boiler and standard method.
When tank temperature drops causing tank pressure to decrease during loaded passage, inert gas pressure is maintained by topping up from the boiler flue gas system using standard procedures.

7. What is handy size tanker.

  • A. Tankers of about 12000 to 25000 DWT.
  • B. From 26000 to 16500 tdw
  • C. Under 16,500 DWT
  • D. from 36000 to 26000 tdw
Answer: A — Tankers of about 12000 to 25000 DWT.
Handy size tankers generally refer to smaller product or chemical tankers typically in the range of 12,000 to 25,000 DWT.

8. Before cargo operations begin the responsible person on board and the terminal representative will complete___?

  • A. Meeting agreement
  • B. Ship / shore operation plan
  • C. Ship details plan
  • D. Ship / shore safety check list
Answer: D — Ship / shore safety check list
In accordance with ISGOTT guidelines, the Ship/Shore Safety Checklist (SSSCL) must be jointly verified and signed by the responsible ship officer and terminal representative prior to starting cargo operations.

9. In theory, a cargo pump should be able to draw up a liquid to a height equaling atmospheric pressure. This would be approximately ___?

  • A. 30 meters
  • B. 15 meters
  • C. 5 meters
  • D. 10 meters
Answer: D — 10 meters
Standard atmospheric pressure (101.3 kPa / 1.013 bar) corresponds to a theoretical water column height of approximately 10.33 meters.

10. In flue gas line. It would be advantageous to fit _______door downstream from the flue gas valve?

  • A. Inspection
  • B. Access
  • C. both a and b
  • D. None of the above
Answer: C — both a and b
Fitting inspection and access doors downstream of the flue gas isolating valve allows inspection, cleaning of soot deposits, and maintenance of the line and valve seal.

11. The depth of the space in a tank not occupied by oil. same as ullage. It is measured from the flange of the ullage hole to the surface of the space left in petroleum product container to allow for expansion as a result of temperature chages during shipment and use,?

  • A. Innage
  • B. Outage (Ullage)
  • C. Sounding
  • D. Air volume
Answer: B — Outage (Ullage)
Outage (Ullage) is the distance from the designated reference point (ullage port flange) down to the surface of the liquid in the tank.

12. A cargo educator casing normally made of which of the following material?

  • A. Phosphor bronze cast
  • B. Specially made cast steel
  • C. Cast iron
  • D. Stainless steel
Answer: A — Phosphor bronze cast
Cargo stripping eductor casings are commonly cast from phosphor bronze or gunmetal due to excellent corrosion resistance and non-sparking properties in seawater/hydrocarbon service.

13. Chapter __ of the code contains special requirements which are cargos specific and which must be complied with only if that specification is to be carried.

  • A. 14
  • B. 15
  • C. 16
  • D. 17
Answer: D — 17
Chapter 17 of the IBC Code contains the Summary of Minimum Requirements (cargo-specific operational and design requirements for chemical cargoes).

14. What is the meaning of non-volatile cargo?

  • A. Flash point below 65 c
  • B. Flash point above 60 c
  • C. Flash point above 65 c
  • D. Flash point below 60 c
Answer: B — Flash point above 60 c
According to ISGOTT and tanker safety standards, non-volatile petroleum is defined as petroleum having a closed-cup flashpoint of 60°C (140°F) or above.

15. What is the meaning of volatile cargo?

  • A. Flash point below 65 c
  • B. Flash point above 60 c
  • C. Flash point above 65 c
  • D. Flash point below 60 c
Answer: D — Flash point below 60 c
According to ISGOTT, volatile petroleum is defined as petroleum having a closed-cup flashpoint of below 60°C (140°F).

16. The __ should be fitted with suitable inspection & drainage arrangements?

  • A. Mast riser
  • B. PV valve
  • C. PV breaker
  • D. All the above
Answer: D — All the above
Venting system components including mast risers, P/V valves, and P/V breakers must have inspection and drainage provisions to prevent liquid accumulation and blockage.

17. ____ such as petrol (motor spirit) and diesel oil tend to be liquid under normal atmosphere?

  • A. Intermediate molecule
  • B. Very heavy molecules
  • C. Very light molecules
  • D. None of these
Answer: A — Intermediate molecule
Hydrocarbons with intermediate molecular weights (approx C5 to C20, like gasoline, kerosene, and diesel) exist as liquids at normal atmospheric temperature and pressure.

18. A phrase sometimes used to describe an action or procedure that is not committed to writing. but which has been followed for a long time. and considered standard practice by practitioners in the trade.

  • A. Natural Limitation
  • B. Custom of the Trade
  • C. Both
  • D. none of the above
Answer: B — Custom of the Trade
'Custom of the Trade' refers to traditional, long-established practices accepted as standard operating norms in maritime shipping.

19. What types of ships are commonly known as pre-MARPOL tankers?

  • A. A ship which does not comply with the requirements for protectively located segregated ballast tanks
  • B. A category 2 oil tanker
  • C. A ship which do comply with die requirements for protectively located segregated ballast tank
  • D. A category 3 oil tanker
Answer: A — A ship which does not comply with the requirements for protectively located segregated ballast tanks
Pre-MARPOL tankers are older tankers constructed before the enforcement of MARPOL 73/78 regulations requiring protectively located segregated ballast tanks (PL/SBT) and double hulls.

20. Tankers of similar size to parcel tankers but with fewer cargo tanks, mostly of coated steel rather than stainless, and less sophisticated pump and line arrangements. Such ships carry the less difficult chemicals, and also trade extensively with clean oil products.

  • A. Genral Product tanker
  • B. Utility chemical tanker
  • C. Product / Chemical tanker
  • D. Special Chemical tanker
Answer: C — Product / Chemical tanker
Product/Chemical tankers have coated tanks and can alternate between clean refined petroleum products and less aggressive/easy chemical cargoes.

21. What are easy chemicals____?

  • A. Calcium carbonate
  • B. Hydrogen chloride
  • C. Sodium hydroxide
  • D. All of the above
Answer: D — All of the above
'Easy chemicals' are commodity bulk chemicals that do not require specialized high-grade stainless steel or complex inhibitor management under typical carriage.

22. In a sample of ethyl Ethanoate (CH3 COOC2H5) THE TWO oxygen atoms have the same number of electrons but different numbers of neutrons. Which of the following is the correct reason for it?

  • A. One of the oxygen atoms has gained electrons
  • B. One of the oxygen atoms has gained two neutrons
  • C. The two oxygen atoms are isotopes
  • D. The two oxygen atoms are isobars
Answer: C — The two oxygen atoms are isotopes
Atoms of the same element having the same number of protons and electrons (same atomic number) but different numbers of neutrons (different mass numbers) are called isotopes.

23. PV valve is fitted at?

  • A. Common IG line
  • B. Cargo Pipeline
  • C. Individual cargo tanks
  • D. none of these
Answer: C — Individual cargo tanks
Pressure/Vacuum (P/V) valves are fitted to individual cargo tanks or individual tank vent lines to protect tanks against over-pressurization and vacuum during thermal variations.

24. Typically, up to 40,000 tonnes deadweight with multiple small cargo tanks - up to 54 - each with an individual pump and a dedicated pipeline, to carry small parcels of high grade chemicals. These ships have a significant proportion of the cargo tanks made with stainless steel, allowing maximum flexibility to carry cargoes that need their quality safeguarded.

  • A. Sophisticated parcel chemical tankers:
  • B. Complicated Chemical tanker
  • C. Afra max chemical tanker
  • D. None of these
Answer: A — Sophisticated parcel chemical tankers:
Sophisticated parcel chemical tankers are designed with numerous stainless steel cargo tanks, independent submerged pumps, and dedicated piping to carry high-purity, aggressive, or sensitive chemical parcels simultaneously.

25. During loading. firefighting equipment should be laid out ready for use in the vicinity of the?

  • A. Engine room
  • B. Pump Room
  • C. Stern manifold
  • D. none of these
Answer: D — none of these
During cargo operations, portable dry chemical powder extinguishers and charged fire hoses must be rigged and ready for immediate deployment in the vicinity of the active cargo manifold on deck.

26. Is cubic limitation: - this is usually caused by loading a light crude (crude with high API) or clean products?

  • A. Reaching cargo tank capacity before vessel immerses to its load-line
  • B. Loading in all cargo and slop tanks
  • C. Loading maximum till the maximum load line
  • D. Loading till the orders of the cargo receiver
Answer: A — Reaching cargo tank capacity before vessel immerses to its load-line
Cubic limitation (volumetric capacity limit) occurs when low-density (high API gravity) cargo fills 100% of the available tank volume before the ship reaches its maximum permissible deadweight/draft mark.

27. Which of the following methods applies to how a vacuum is created by a jet pump or an eductor?

  • A. A propeller drawing a fluid through a Venturi nozzle.
  • B. A reciprocating plunger directly applying force to a fluid.
  • C. A rapidly moving stream of fluid passing through a nozzle.
  • D. Centrifugal force converted into potential energy.
Answer: C — A rapidly moving stream of fluid passing through a nozzle.
An eductor operates on the Venturi principle: high-velocity driving fluid pumped through a convergent nozzle creates a low-pressure area (vacuum) that entrains suction liquid.

28. General arrangement plan-A drawing of a ship which lists all necessary statistics and operating information such as?

  • A. LOA, SDWT, cargo, water, fuel capacity etc.
  • B. type of cargo and ships
  • C. water ballast exchange log
  • D. all of the above
Answer: A — LOA, SDWT, cargo, water, fuel capacity etc.
The General Arrangement (GA) plan outlines the overall layout, compartment divisions, principal dimensions (LOA, beam, draft), and tank capacities of the vessel.

29. The Convention that allows States to intervene in a pollution incident at sea is the?

  • A. MARPOL Convention
  • B. SOLAS Convention
  • C. CLC Convention
  • D. Intervention Convention
Answer: D — Intervention Convention
The International Convention Relating to Intervention on the High Seas in Cases of Oil Pollution Casualties (1969) empowers coastal states to take preventive measures beyond territorial waters.

30. When doing an enclosed space rescue, the person in charge must coordinate the rescue:

  • A. From inside the space
  • B. From the Bridge
  • C. From outside the space
  • D. From the Engine Control Room
Answer: C — From outside the space
In an enclosed space rescue, the person in charge must remain outside the space at the entrance to coordinate communications, resources, and emergency services effectively.

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