CHEMCO exit exam questions and answers — Set 12
Set 12 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 12 — 30 CHEMCO exit exam questions with answers
1. The lowest temperature at which a liquid will give off sufficient vapors to form a flammable mixture with air is known as the _________.
- A. fire point
- B. flash point
- C. lower explosive limit
- D. threshold limit value
2. The high-level overfill tank alarm, installed in the on-board monitoring system, must
- A. operate in unison with other alarms
- B. be both audible and visual
- C. be the same as the overfill alarm
- D. sound when the tank is 90% full
3. What is NOT a precaution to be taken when topping off?
- A. Reduce the loading rate.
- B. Notify the engine room of the procedure.
- C. Maintain communications with the dock man.
- D. Give the operation your undivided attention.
4. The minimum concentration of a vapor in air which can form an explosive mixture is called the
- A. auto-ignition point
- B. flash point
- C. lower explosive limit (LEL)
- D. threshold limit value (TLV)
5. What is the material used in cargo pump?
- A. EN 8
- B. Bronze
- C. Aluminium
- D. Stainless steel
6. What happens in the volute casing of the centrifugal pump?
- A. Pressure energy converted into Kinetic energy
- B. Velocity of the liquid increases
- C. Kinetic energy converted into pressure energy
- D. Air bubbles are produced, creating cavitation
7. What type of pump, the FRAMO system uses for liquid chemical cargo?
- A. Reciprocating pump
- B. Variable delivery axial flow pump
- C. Centrifugal pump
- D. Gear pump
8. Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant.
- A. cargo pump failure
- B. blower failure
- C. deck seal low water level
- D. low inert gas temperature
9. Cargoes carried by a tanker as miscellaneous liquids are
- A. Palm oil, molasses, tallow
- B. Soybean oil, Sunflower oil, Other vegetable oils
- C. Animals oils, Grease
- D. Freshwater, Wine, Beer
10. The organic chemical liquids are
- A. Phosphoric acid, Hydrochloric acid, Molten sulfur
- B. Tallow and greases, Molasses, Wine
- C. Boric acid, Sulfuric acid, Caustic soda
- D. Vinyl chloride, Acetone, Acetic acid
11. The chemical liquids may be categorized as
- A. Organic or Inorganic
- B. Volatile or Non-volatile
- C. Flammable or combustible
- D. Petroleum or special
12. Why personal protective equipment may be required when a chemical tanker carry high vapor pressure cargo?
- A. Because high vapor pressure releases more vapor
- B. Because high vapor pressure releases less vapor
- C. Because high vapor pressure releases hot vapor
- D. Because high vapor pressure releases cold vapor
13. Molarity = Number of moles of solute per
- A. Solvent in kilograms
- B. Solution in litres
- C. Mililitres
- D. Litres
14. Vegetable and animal oils may vary in composition and the most important factor is their free fatty acid content, which greatly affects
- A. The carriage pressure
- B. The cargo pumping rate
- C. The suitability of coatings
- D. The cargo tank atmosphere
15. What is the effect of intermolecular forces on vapor pressure?
- A. Relatively strong force will increase vapor pressure
- B. Relatively strong force will decrease vapor pressure
- C. Relatively weak force will decrease vapor pressure
- D. Relatively weak force does not have any effect on vapor pressure
16. Specific gravity is used by the American Petroleum Institute (API) to classify various
- A. Viscosities of oil
- B. Vapor densities of oil
- C. Weights of oil
- D. Volumes of oil
17. Vegetable and animal oils may vary in composition. The most important factor is their
- A. Alkalinity content
- B. Hydrocarbon content
- C. Composition
- D. Free fatty acid content
18. System in which both matter and energy can be exchanged with the surroundings is
- A. Open system
- B. Closed system
- C. Surrounding
- D. Isolated system
19. Combustion of carbon is an example for
- A. Exothermic reaction
- B. Endothermic reaction
- C. Reversible reaction
- D. Irreversible reaction
20. Sublimation is the transition of a substance directly from
- A. Liquid to the gas phase & Vice versa
- B. Solid to the Liquid phase & Vice versa
- C. Gas to the super heated gas phase & Vice versa
- D. Solid to the gas phase & Vice versa
21. The change in the internal energy is represented as
- A. ∆U
- B. ∆H
- C. ∆G
- D. ∆T
22. Bottle A contains a dilute solution of vinegar and bottle B contains sodium carbonate solution, the colours seen in pH paper dipped in A and B are :
- A. orange, blue
- B. green, blue
- C. blue, orange
- D. orange, green
23. Which process does not result in the formation of both carbon dioxide and water?
- A. addition of a dilute acid to a carbonate
- B. burning ethanol
- C. burning methane
- D. heating crystals of hydrated sodium carbonate
24. In a volumetric experiment involving the addition of hydrochloric acid to 25.0 cm3 of aqueous sodium hydroxide it is necessary to determine when the reaction is just complete. Which piece of apparatus could be used to determine the end-point of the reaction
- A. balance
- B. gas syringe
- C. stop watch
- D. thermometer
25. Which compound in a 1 mol/dm3 solution has the lowest pH value?
- A. ethanoic acid
- B. hydrogen chloride
- C. sodium chloride
- D. sodium hydroxide
26. In a binary homogeneous solution the component present in a _____ amount is called a solute.
- A. smaller
- B. Larger
- C. fixed
- D. miscible
27. The energy possesed by all the molecules or atoms is called
- A. Internal energy
- B. Enthalpy
- C. Gibbs energy
- D. Free energy
28. Indicators used in acid-base titrations are
- A. strong organic acids
- B. strong organic bases
- C. weak organic acids or weak organic bases
- D. non electrolysis
29. A bee sting is acidic. Which household substance will neutralise a bee sting?
- A. damp bicarbonate of soda pH8
- B. damp common salt pH7
- C. lemon juice pH5
- D. vinegar pH4
30. The complex group of liquid cargoes that includes alcohols, ketones, glycols, esters, ethers, aromatic hydrocarbons, chlorinated hydrocarbons, etc. are known as
- A. Solvents and Chemicals
- B. White Oil
- C. Non-petroleum oil
- D. Other chemicals
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