CHEMCO exit exam questions and answers — Set 4

1. Tank coating requirements developed by IMO are applicable to

• A. new crude oil tankers of 5000 GRT and above
• B. new crude oil tankers of 5000 DWT and above
• C. new crude oil tankers of 500 GRT and above
• D. new crude oil tankers of 500 DWT and above

2. A deepwell pump is a type of ___________.

• A. screw pump
• B. centrifugal pump
• C. eductor
• D. gear pump

3. Bottom washing:

• A. is done to remove traces of the previous cargo
• B. will remove heavy wax sediments at the tank bottom
• C. is not effective when carrying a small quantity of refined products
• D. cannot be done with chemical solvents

4. The total capacity of all slop tanks on an oil tanker normally should be

• A. 1% of the total oil carrying capacity of ship
• B. 2% of the total oil carrying capacity of ship
• C. 3% of the total oil carrying capacity of ship
• D. 4% of the total oil carrying capacity of ship

5. An inert gas system is required to be fitted:

• A. On all tankers of above 20,000 tonnes deadweight
• B. On product tankers of above 20,000 tonnes deadweight
• C. On crude oil tankers of above 20,000 tonnes deadweight
• D. On chemical tankers of above 20,000 tonnes deadweight

6. Centrifugal pumps are otherwise known as

• A. Reciprocating pumps
• B. Gravity pumps
• C. Positive discplacement pumps
• D. Hydro-dynamic pumps

7. The ring main pipeline system is extensively used on:

• A. VLCCs
• B. Crude oil tankers
• C. Medium range tankers
• D. Product carriers

8. Class B fires are caused by

• A. combustible solids
• B. flammable liquids
• C. flammable gases
• D. electricity

9. Use of Pressure-Vacuum (PV) Relief Valve; label the diagram correctly,

• A. 1-IG Main; 2-Deck Isolating Valve ; 3- Vent Main; 4- By-Pass Valve; 5- PV valve; 6- Tank Isolating Valve
• B. 1-Deck Isolating Valve; 2- Vent Main; 3- IG Main; 4- By-Pass Valve; 5- PV valve; 6- Tank Isolating Valve
• C. 1-Deck Isolating Valve; 2- IG Main; 3- Vent Main; 4- By-Pass Valve; 5- PV valve; 6- Tank Isolating Valve
• D. 1-Deck Isolating Valve; 2- IG Main; 3- Vent Main; 4- By-Pass Valve; 5 - Tank Isolating Valve; 6- PV valve

10. Cargo tank fill alarm indicator panels:

• A. are normally fitted on the bridge and sometimes on deck
• B. are normally fitted in the engine control room and sometimes on deck
• C. are normally fitted on the bridge and sometimes in the engine control room
• D. are normally fitted in the cargo control room and sometimes on deck

11. Identify the equipment in the IG system correctly,

• A. 1-O2 Analyzer ; 2-Demister; 3-Air Intake-Gas Freeing; 4- Regulating Valves; 5- Blowers
• B. 1- Demister; 2-O2 Analyzer; 3-Air Intake-Gas Freeing; 4- Regulating Valves; 5- Blowers
• C. 1- Demister; 2-O2 Analyzer; 3 - Blowers ; 4- Regulating Valves; 5- Air Intake-Gas Freeing
• D. 1- Demister; 2-O2 Analyzer; 3-Regulating Valves; 4-Air Intake-Gas Freeing ; 5- Blowers

12. Tank level measurement by gauging tape and plumb bob: find the labeling combination that is correct,

• A. 1- Reference Point; 2-Tape Cut; 3-Bob Cut; 4-Ullage; 5- Innage
• B. 1- Reference Point; 2-Tape Cut; 3-Bob Cut; 4-Innage; 5- Ullage
• C. 1- Bob Cut; 2-Reference Point; 3-Tape Cut; 4-Ullage; 5- Innage
• D. 1- Innage; 2-Tape Cut; 3-Bob Cut; 4-Ullage; 5- Reference Point

13. Cargo discharging: find a statement that ensures safe cargo discharging from start to finish,

• A. When the vessel arrives at the discharge port, the inert gas system should be tested and ready for operation in due time for discharge.
• B. Before pumping of cargo oil is started, the inert gas system should be in operation and connected to the deck line, with the pressure control in the "automatic" position.
• C. Cargo discharge should not be commenced until all the conditions have been checked; tanks should be re- pressurized if required
• D. During discharge the oxygen content and pressure of the inert gas in the inert gas main should be continuously recorded as per regulation.

14. Automatic shutdown systems independent of operator intervention: how to ensure that it will work correctly?

• A. Express approval for their use is required from both the flag administration and the port state authorities.
• B. Automatic shutdown systems are normally designed to shut the main cargo tank filling valve if the liquid level rises above the maximum level permitted.
• C. Ensure that the activation point is set accurately, and that the operation of the device is checked by simulation whenever the system is recommissioned.
• D. If the ship and shore shutdown circuits are to be linked their operation should be checked before cargo transfer begins; if not, the terminal should be informed of the closing rate of the ship's valves.

15. Statements on Float Gauges; identify the key statement of importance,

• A. Floats should be secured when at sea, except briefly during measurement of tank contents.
• B. If the float remains unsecured at sea it will almost certainly be damaged due to sloshing of the cargo
• C. Remote and local readings should be compared frequently to determine discrepancies;
• D. Readings may need to be corrected to allow for tape and tank expansion or contraction, and ship trim and heel. Tables are normally provided for this purpose

16. Several types of bobs connected to handheld tapes: Identify those correctly,

• A. 1-Innage Bob; 2-Plain Ullage Bob; 3-Extension Outage Bob; 4-Deep-grooved ullaged Bob
• B. 1-Innage Bob; 2-Extension Outage Bob; 3-Deep-grooved ullaged Bob; 4-Plain Ullage Bob
• C. 1-Extension Outage Bob; 2-InnageBob ; 3-Plain Ullage Bob; 4-Deep-grooved ullaged Bob
• D. 1-Innage Bob; 2-Extension Outage Bob; 3-Plain Ullage Bob; 4-Deep-grooved ullaged Bob

17. Example of cargo heating system: identify correct labelling

• A. 1-Steam Return Line; 2-Compressed Air Line ; 3- Steam Supply Line; 4- Toxic Gas Detector
• B. 1-- Toxic Gas Detector; 2-Steam Return Line; 3- Steam Supply Line; 4-Compressed Air Line
• C. 1-Compressed Air Line; 2-Steam Return Line; 3- Steam Supply Line; 4- Toxic Gas Detector
• D. 1-Steam Supply Line; 2-Steam Return Line; 3-Compressed Air Line; 4- Toxic Gas Detector

18. Inerting Operations:During normal operation of oil tankers the following operational modes frequently take place: find an operation that is required after tank cleaning during a ballast voyage and before loading

• A. Inerting of empty tanks
• B. Inerting during loading and simultaneous discharge of ballast
• C. Inerting during loaded sea voyage
• D. Inerting during discharging and ballasting

19. The terminal indicates to you that they are going to use a booster pump to assist the discharging operation. You start the discharge and in a few minutes the pressure drops sharply. This could be a result of the ___________.

• A. booster pump coming on the line and discharging properly
• B. booster pump failing to start
• C. ship's pump speeding up
• D. booster pump being lined up in the wrong direction

20. A restricted tank gauging system

• A. Allows limited amounts of vapour to escape
• B. Does not allow vapour to escape
• C. Uses a float gauge
• D. Does not use an ullage tape

21. The lowest temperature at which the liquid remains a fluid is called the:

• A. The flow point
• B. The pour point
• C. The melting point
• D. The Liquefaction point

22. An inert gas system installed on a tanker is designed to

• A. aid in the stripping and cleaning of cargo tanks
• B. increase the rate of discharge of cargo
• C. force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere
• D. lower the oxygen levels inside cargo tanks, making explosion nearly impossible

23. For the purposes of cargo oil containment, the fixed container under the manifold of an eight-inch loading line must hold a minimum of

• A. three barrels
• B. four barrels
• C. six barrels
• D. eight barrels

24. What is the purpose of the relief valve of a cargo pump?

• A. Provides for the removal of vapors
• B. Allows two or more tanks to be filled at the same time
• C. Provides for the emergency shutdown of the pump
• D. Permits the return of cargo to the suction side of the pump

25. Identify correct labelling for Tanker VEC

• A. 1- P/V Valve; 2- P/V Breaker; 3- Mast Riser; 4 - Deck water seal
• B. 1- P/V Valve; 2- P/V Breaker; 3- Deck water seal; 4- Mast Riser
• C. 1- Mast Riser; 2- P/V Breaker; 3- P/V Valve; - Deck water seal
• D. 1- P/V Valve; 2- Mast Riser; 3- P/V Breaker; 4 - Deck water seal

26. A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a _____.

• A. blind flange
• B. pivot coupling
• C. quick-release coupling
• D. spectacle flange

27. Hydrocarbon gas normally encounted in petroleum tankers cannot burn in an atmosphere containing oxygen less than

• A. 2%
• B. 11%
• C. 5%
• D. 8%

28. Who is responsible for ensuring instruments are sent ashore for calibration when required ?

• A. The Company
• B. The Master
• C. The Safety Officer
• D. The Chief Officer

29. An on-board monitoring system, using level sensors permanently installed in each vessel compartment, will have a high level alarm set at not more than

• A. 90% of compartment capacity
• B. 95% of compartment capacity
• C. 97% of compartment capacity
• D. 99% of compartment capacity

30. The volatility of a flammable liquid is indicated by its

• A. ignition temperature
• B. flash point
• C. flammable range
• D. conversion index