CHEMCO exit exam questions and answers — Set 5
Set 5 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 5 — 30 CHEMCO exit exam questions with answers
1. Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?
- A. The tank must be gas freed.
- B. The tank must be ballasted.
- C. The tank must be vented to the atmosphere.
- D. The bypass valve must also be closed.
2. The purpose of inert gas systems aboard tankers is to
- A. allow sufficient oxygen in the tank to sustain life
- B. prevent outside air from entering the tank
- C. provide increase in cargo discharge pressure
- D. comply with double hull pollution prevention regulations
3. Before a tank is to be crude oil washed, the oxygen content in the tank must be measured at a position ________.
- A. immediately above the level of the oil
- B. at the top of the tank
- C. in the vent riser
- D. one meter from the deck
4. The explosive range of petroleum vapors mixed with air is
- A. 0% to 1%
- B. 1% to 10%
- C. 10% to 15%
- D. 12% to 20%
5. The (auto) ignition temperature is that temperature at which __________.
- A. no spark or flame is required to ignite gas or vapor
- B. a fuel begins to give off explosive vapors
- C. a fuel if ignited will continue to burn
- D. a 1% mixture of the fuel with air will explode
6. In reference to accidental oil pollution, the most critical time during bunkering is when
- A. you first start to receive fuel hoses are being disconnected
- B. hoses are being blown down
- C. final topping off is occurring
- D. hoses are being disconnected
7. Which characteristic is an advantage of a butterfly valve as compared to a gate valve?
- A. Precise control over cargo flow
- B. Quick operation
- C. No resistance to cargo flow when open
- D. Less maintenance required
8. Which of the following is not an exception provided under MARPOL, Annex-1, regarding the discharge of oil or oily mixture into the sea?
- A. Discharge for the purpose of securing safety of a ship
- B. Discharge for the purpose of saving life at sea
- C. Discharge resulting due to damage to the ship because of Master's fault even if the Master/Owner of the ship has taken all reasonable precautions to prevent/minimize discharge
- D. Discharge resulting due to damage to the ship not because of Master's fault, but because of a third party's fault and action awaited by Master from that third party to prevent /minimize discharge
9. While using a combustible gas indicator, if the hydrocarbon content of the atmosphere exceeds the U.E.L., the needle of the indicator will
- A. remain at zero without moving
- B. move to the maximum reading and stay there
- C. move halfway up the scale
- D. move to the maximum reading and immediately return to zero
10. In the ‘flow through’ method of ballast water exchange:
- A. Ballast equal to approximately two times the tank capacity must be pumped through the tank
- B. Ballast equal to approximately three times the tank capacity must be pumped through the tank
- C. Ballast equal to approximately four times the tank capacity must be pumped through the tank
- D. Ballast equal to approximately five times the tank capacity must be pumped through the tank
11. The preferred type of pollution control for oil spills on the water is(are)
- A. straw
- B. booms
- C. skimmers
- D. chemical dispersants
12. Which operation may cause the pressure in an inert tank to fall below the prescribed limits?
- A. Loading
- B. Discharging
- C. Crude oil washing
- D. Steaming tanks
13. The most likely location for a liquid cargo fire to occur on a tanker would be
- A. in the midships house
- B. at the main deck manifold
- C. at the vent header
- D. in the pumproom
14. Identify the correct labeling, when the tanker has heeled to a small angle.
- A. 1- Metacenter; 2- GZ- Righting Lever; 3-Center of Gravity; 4- Center of Buoyancy
- B. 1- Center of Gravity; 2- GZ- Righting Lever; 3-Center of Buoyancy; 4- Metacenter
- C. 1- Metacenter; 2- GZ-Shift of Buoyancy; 3-Center of Buoyancy; 4- Center of Gravity
- D. 1- Metacenter; 2- GZ- Righting Lever; 3-Center of Buoyancy; 4- Center of Gravity
15. Working instructions specifying the manner in which the ship is to be loaded and ballasted to avoid unacceptable stresses in the vessel’s structure is required for tankers:
- A. Greater than 50 metres in length
- B. Greater than 75 meters in length
- C. Greater than 100 meters in length
- D. Greater than 150 meters in length
16. A self-contained breathing apparatus is used to
- A. make underwater repairs to barges
- B. determine if the air in a tank is safe for men
- C. enter areas that may contain dangerous fumes or lack oxygen
- D. resuscitate an unconscious person
17. Part A of the the ISGOTT Ship/Shore Safety Check-List provides operational procedures for:
- A. Transfer of bulk liquids, physical checks
- B. Transfer of bulk liquids – elements to be verified verbally
- C. Additional considerations for Bulk Liquid Chemicals
- D. Additional considerations for Bulk Liquefied Gases
18. The approval period for a shipboard Oil Pollution Emergency Plan expires after
- A. two years
- B. three years
- C. four years
- D. five years
19. Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system?
- A. Cools the inert gas.
- B. Maintains the oxygen content at 5% by volume.
- C. Bleeds off static electricity in the inert gas.
- D. Maintains flow to the water seal on the gas main.
20. With an increase in temperature the volume of flammable and combustible liquids____.
- A. expands
- B. contracts
- C. remains constant
- D. remains constant if pressure remains constant
21. The standard unit of liquid volume used in the petroleum industry, as well as the tanker industry, is a __________.
- A. barrel
- B. drum
- C. gallon
- D. liter
22. Combustible gas indicators operate by drawing an air sample into the instrument
- A. over an electrically heated platinum filament
- B. where it is mixed with nitrogen
- C. where it is ignited by a sparking device
- D. where its specific gravity is measured
23. After each reading of an oxygen indicator, the instrument should be purged with
- A. CO2
- B. fresh air
- C. the tested compartment's air
- D. water
24. When the cofferdam to be purged to check the leakage and remove the leaked oil?
- A. Before starting the cargo operation
- B. Before starting the cargo operation and after the cargo operation is completed
- C. During the cargo operation
- D. After the cargo operation is completed
25. How the Framo pump has almost eliminated cavitation for free flowing liquids?
- A. Volute casing is designed in such a way, that its smoothness avoids cavitation
- B. The backwards curved vanes eliminate the cavitation
- C. The hydrofoil design of the curved vanes, eliminate cavitation
- D. Since the suction pipe is eliminated, cavitation is also eliminated for liquids with free flow
26. Select the correct statement.
- A. Pressure type vacuum valves can prevent Backflow.
- B. Dynamic pressure is a function of the fluid velocity and its density.
- C. The water reservoir of a self-priming pump may be at the back of the impeller.
- D. Stripping pumps are not of the self-priming type.
27. Why the cargo pump in the Framo cannot be overloaded?
- A. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the flow is always kept constant
- B. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the pump runs at the optimum speed
- C. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, when the pump over speeds, the flow of oil is reduced
- D. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the pressure can run the pump at 75% of the capacity
28. Normally how much hydraulic oil is required to run the Framo portable pump?
- A. 360 litres per min
- B. 250 litres per min
- C. 140 litres per min
- D. 90 litres per min
29. Select the correct point regarding the operation of the portable pumps?
- A. Before using portable pump, rig the pump on the deck and while pumping, lower the hose in the tank
- B. When the liquid cargo level goes down, lower the hose accordingly, keeping the rigged pump on the deck
- C. Make sure that the portable pump is completely submerged and lowered till the bottom of the tank and then start the pumping operation
- D. Ensure that only the lower half of the pump is submerged and is lowered as the cargo level falls.
30. What is the pressure of the hydraulic oil in the return side after running the hydraulic motor?
- A. Around 3 Bar
- B. Around 10 bar
- C. Around 15 bar
- D. Above 15 bar
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