CHEMCO exit exam questions and answers — Set 11
Set 11 of the Advanced Training for Chemical Tanker Cargo Operations (CHEMCO) exit exam bank — 30 of 377 questions, with the correct option marked. This bank is answer-only: the source published no usable explanations for it, so there are none here either. 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 CHEMCO exit exam questions with answers
1. Quick Closing Valve: identify the purpose of such a valve,
- A. Fuel oil gravity tanks must be fitted with valves that can be closed rapidly and remotely in the event of an emergency such as a fire.
- B. Quick closing valves can be wire operated mechanically from outside the engineroom
- C. Quick closing valves can behydraulically or pneumaticallyoperated from outside the engineroom
- D. Quick closing valves are not usedfor throttle purpose
2. Which of the following is true about eductors?
- A. They can be used only when there is a good level of liquid in the tank to be pumped out
- B. Sea water can be used as drive and crude oil pumped out from the tanks
- C. They sometimes make high vibrations and even lead to pipeline and gauge damage
- D. A long preparation is required before eductor can be put to use
3. Which one of the following is not a piping system found on an oil tanker?
- A. Ring main system
- B. Integrated system
- C. Direct line system
- D. Free flow system
4. The purpose of a cofferdam between two compartments is to
- A. store tools and equipment that are necessary for the adjacent compartments
- B. give access to the bulkhead for inspection and repairs when the tanks are full with liquid
- C. keep a reserve space if capacity of either compartment needs to be increased
- D. prevent different liquids from the two tanks coming in contact in case of a leak
5. Prior to entering a cargo pump room, you should ensure that
- A. the forced ventilating system is operating
- B. the cargo pumps are secured
- C. no mono carbon gases are present
- D. the oily water separator is de-energized
6. The complete details of a crude oil washing system aboard your vessel, including the operating sequences and procedures, design characteristics, a description of the system, and required personnel will be found in the
- A. Oil Transfer Procedures Manual
- B. Crude Oil Washing Operations and Equipment Manual
- C. Code of Federal Regulations
- D. Crude Oil Washing addendum to the Certificate of Inspection
7. You are testing a tank that contained gasoline by using a combustible gas indicator. Under testing, the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero. What is the concentration of flammable gas?
- A. Less than the flammable range
- B. Within the flammable range
- C. Over the flammable range
- D. The explosimeter is defective and giving a false reading.
8. Which of the following documents carried by a ship is not issued under the MARPOL convention?
- A. IOPP certificate
- B. Oil Record Book
- C. SOPEP
- D. Safety Management Certificate
9. Which of the following conditions need NOT be satisfied while discharging oil or oil mixtures from ships into the sea?
- A. The ship must be proceeding en route
- B. The ship must be at a distance of 12 nautical miles from the nearest land
- C. The oily mixture is processed through an oil filtering equipment as per Reg. 14 of Annex-1
- D. The oil content of the effluent without dilution does not exceed 15 ppm
10. Which tanker discharge pattern would be the safest and most efficient?
- A. Empty the forward tanks and start working aft, emptying each tank in sequence
- B. Start discharging with most of the discharge coming from forward, but include some from midships and after tanks
- C. Start pumping from forward, midships, and aft with the discharge distributed equally among the tanks
- D. Start pumping from midships and then work forward and aft simultaneously as the midships tank is emptied
11. Ballast water exchange should be done:
- A. at least 100 nautical miles from the nearest land and in waters at least 100 metres in depth.
- B. at least 200 nautical miles from the nearest land and in waters at least 100 metres in depth.
- C. at least 200 nautical miles from the nearest land and in waters at least 200 metres in depth.
- D. at least 100 nautical miles from the nearest land and in waters at least 200 metres in depth.
12. As per requirements of Marpol, Annex 1, all ships delivered on or after 1st Aug. 2010 with an aggregate oil fuel capacity 600 m3 and above, the oil fuel can be carried in
- A. Any of the tanks without any restriction
- B. Deep tanks and Double bottom tanks
- C. Deep tanks in protective locations
- D. Double bottom tanks not extending upto the ship's side
13. The atmosphere in a tank is too rich when it is
- A. incapable of supporting combustion because the hydrocarbon vapor content
- B. makes the atmosphere below the LFL (Lower Flammable Level) capable of supporting combustion
- C. in a noncombustible state which can be relied on to occur naturally on a regular basis
- D. incapable of supporting combustion because the hydrocarbon vapor content makes the atmosphere above the UFL (Upper Flammable Limit)
14. Reid vapor pressure is __________.
- A. exerted by liquid cargo on the sides of a tank
- B. exerted by liquid cargo on a cargo hose body
- C. the lowest temperature and pressure that will cause a flammable liquid to give off vapors
- D. a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
15. The fitting at the end of a cargo line in a tank that allows suction to be taken close to the bottom of a tank is a ___________.
- A. suction end
- B. strainer
- C. bell-mouth
- D. vacuum valve
16. The use of sinking and dispersing chemical agents for removal of surface oil is
- A. the most common method used
- B. too expensive for common use
- C. generally safe to sea life
- D. authorized only with prior approval
17. High level and overfill tank alarms are set:
- A. as per the ships cargo system
- B. to values as recommended by the manufacturer
- C. to values depending on cargo type
- D. to values as recommended by the ISGOTT guide
18. The term "oil" as used in the Oil Pollution Regulations means
- A. fuel oil
- B. sludge
- C. oil refuse
- D. fan speed
19. You are planning to use a crude oil washing system. What precaution must be taken with the source tank for the washing machines?
- A. At least one meter must be decanted from the source tank.
- B. The oil in the source tank must be sampled for compatibility.
- C. The source tank must have been crude oil washed at least once in the past 150 days.
- D. The inert gas system must lower the oxygen content in the source tank to a maximum of 12%.
20. As per definition of MARPOL Annex-1, a Crude oil tanker means a tanker designed to carry
- A. Crude oil and other dirty oils
- B. Crude oil alongwith some refined products
- C. Crude oil only
- D. Crude oil, but alternatively may carry at times dirty and clean oil products also
21. The atmosphere in a tank is too lean if it is
- A. incapable of supporting combustion because the hydrocarbon content is below the LFL (LowerFlammable Limit)
- B. capable of supporting combustion because the hydrocarbon content is above the UFL (UpperFlammable Limit)
- C. capable of supporting a fire once started
- D. not safe for ballasting
22. While testing a cargo tank, your oxygen indicator reads 25% oxygen in the tank. You would then
- A. enter the tank safely
- B. suspect the accuracy of the reading
- C. ventilate the tank
- D. test for nitrogen
23. As per the definition of MARPOL, Annex-1, a combination carrier means a ship designed to carry
- A. Crude oil and refined oil products at the same time in different tanks
- B. Refined oil products and chemical products at the same time in different tanks
- C. A combination of different products at the same time, sometimes also known as a parcel tanker
- D. Either oil or solid cargoes in bulk
24. The main function of a stripping system is to
- A. maintain the temperature of the cargo throughout the vessel
- B. dispose of dangerous vapors within the cargo tanks
- C. increase the loading rate of the shoreside pumps
- D. discharge liquid left in the cargo tanks after the main pumps have discharged the bulk
25. Pollution regulations require that each scupper in an enclosed deck area have a
- A. wooden plug
- B. soft rubber plug
- C. two-piece soft patch
- D. mechanical means of closing
26. During loading and discharging operation in addition o when the cargo tanks have been properly filled each inert gas system must be capable of maintaining a minimum gas pressure of
- A. 50 millimeters of water pressure
- B. 25 millimeters of water pressure
- C. 100 millimeters of water pressure
- D. 5 millimeters of water pressure
27. When authorized to use chemical agents on an oil spill they would
- A. absorb the oil for easy removal
- B. dissolve the oil in the water
- C. facilitate the removal of the pollutant from the water
- D. sink the oil
28. In developing the stability booklet, consideration must be given to including the following information: which one of these will be most important prior sailing out?
- A. Tank sounding tables showing capacities, vertical centers of gravity, and longitudinal centers of gravity in graduated intervals and showing free surface data for each tank.
- B. Information on maximum KG or minimum GM curve that can be used to determine compliance with applicable intact and damage stability criteria.
- C. A rapid and simple means for evaluating other loading conditions.
- D. A brief description of the stability calculations done including assumptions.
29. One of the requirements of a vessel’s intact stability criteria is that:
- A. The GZ should be at least 0.15 metres at an angle of 25 degrees or more
- B. The GZ should be at least 0.15 metres at an angle of 30 degrees or more
- C. The GZ should be at least 0.20 metres at an angle of 25 degrees or more
- D. The GZ should be at least 0.20 metres at an angle of 30 degrees or more
30. As regulation 12 of Annex 1 of MARPOL, all ships of __________ gross tonnage and above shall be provided with a sludge tank for collection of oil residues
- A. 150 tonnes deadweight
- B. 150 gross tonnage
- C. 400 tonnes deadweight
- D. 400 gross tonnage
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