CHEMCO exit exam questions and answers — Set 1 — Advanced Training for Chemical Tanker Cargo Operations
Set 1 of the Advanced Training for Chemical Tanker Cargo Operations (CHEMCO) exit exam bank — 30 of 663 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 1 — 30 CHEMCO exit exam questions with answers
1. Which IMO Code regulates the carriage of dangerous chemicals in bulk on chemical tankers?
- A. IMSBC Code
- B. IGC Code
- C. IBC Code
- D. IMDG Code
2. Under MARPOL Annex II, which pollution category presents the major hazard to human health or marine resources?
- A. Category Y
- B. OS (Other Substances)
- C. Category Z
- D. Category X
3. What test is performed on tank bulkhead surfaces to detect microscopic hydrocarbon residues before loading sensitive chemical cargoes?
- A. Hydrostatic pressure test
- B. Magnetic particle test
- C. Ultrasonic thickness test
- D. Wall Wash Test (WWT)
4. What type of chemical tanker skin/tank construction is required for carrying high-hazard cargoes like Isocyanates?
- A. Type 2 chemical tanker
- B. Single hull barge
- C. Type 3 chemical tanker
- D. Open deck vessel
5. What material is widely used for cargo tanks carrying aggressive acids such as Nitric or Phosphoric acid?
- A. Stainless Steel (e.g. 316L, Duplex 2205)
- B. Aluminum alloy
- C. Zinc silicate coating
- D. Mild carbon steel
6. What is the key limitation of Zinc Silicate tank coatings in chemical tankers?
- A. Highly flammable surface coating
- B. Incompatible with acids and strong alkalis (pH limits usually 6 to 10)
- C. Cannot handle aromatic solvents like Benzene
- D. Melts at room temperature
7. What document must be maintained on board detailing all chemical cargo loading, discharging, tank washing, and slop handling?
- A. Radio Log Book
- B. Cargo Record Book (CRB)
- C. Bell Book
- D. Engine Log Book
8. What is self-polymerization in chemical cargoes?
- A. Dissolving of cargo into seawater
- B. Freezing of liquid into crystal ice
- C. Evaporation of cargo into atmosphere
- D. Chemical reaction where monomer molecules join to form long polymers, generating intense heat
9. What mandatory document provides chemical property, health hazard, reactivity, and emergency response data for a chemical cargo?
- A. Material Safety Data Sheet (MSDS)
- B. Tonnage Certificate
- C. Crew List
- D. Customs Manifest
10. What system is used to purge chemical lines and maintain an inert nitrogen cushion over moisture-sensitive cargoes?
- A. Steam lance system
- B. Seawater flushing system
- C. Nitrogen padding / inerting system
- D. Compressed air blower
11. What is Threshold Limit Value - Time Weighted Average (TLV-TWA)?
- A. Safe airborne exposure concentration for normal 8-hour workday and 40-hour workweek
- B. Maximum limit for 1 minute
- C. Pressure limit
- D. Temperature limit
12. What chemical cargo reaction occurs when two incompatible cargoes contact each other?
- A. Sublimation
- B. Condensation
- C. Incompatible chemical reactivity producing toxic fumes, heat, or explosion
- D. Freezing
13. What is mandatory prior to personnel entering a chemical cargo tank for inspection?
- A. Washing with seawater
- B. Verbal permission from cook
- C. Tank gas-freeing, atmospheric testing for O2 (20.9%), toxic gas (0 ppm), LEL (0%), and Enclosed Space Entry Permit
- D. Opening main valve
14. What personal protective equipment is required during chemical cargo sampling of toxic substances?
- A. Leather apron
- B. Chemical suit, boots, face shield/goggles, chemical resistant gloves, and organic vapor mask or SCBA
- C. Short sleeves
- D. Standard coveralls
15. What equipment must be available near chemical cargo manifolds during transfer operations?
- A. Steam boiler
- B. Radio receiver
- C. Paint spray machine
- D. Emergency safety shower and eye-wash station
16. What is the P&A Manual on a chemical tanker?
- A. Pump manual
- B. Procedures and Arrangements Manual approved by Flag State Administration
- C. Port anchorage guide
- D. Personnel manual
17. What device is installed on chemical tank venting systems to prevent over-pressure or vacuum?
- A. Check valve
- B. High-velocity Pressure/Vacuum (P/V) valve
- C. Globe valve
- D. Needle valve
18. What cargo stripping result is required for modern Type 2 chemical tankers built after May 2007 carrying Category X, Y, Z cargoes?
- A. Maximum residue remaining per tank must not exceed 75 liters
- B. 1000 liters
- C. 5 cubic meters
- D. No limit
19. What is the function of a toxic gas detector tube system (e.g. Dräger tube)?
- A. Test battery
- B. Measure oil viscosity
- C. Measure specific chemical vapor concentrations in ppm by colorimetric reaction
- D. Measure salinity
20. Why are efficient stripping systems essential on chemical tankers?
- A. Increase ship speed
- B. Minimize cargo residue left in tanks prior to mandatory pre-wash or commercial cleaning
- C. Cool engine room
- D. Fill ballast tanks
21. What is the purpose of a mandatory pre-wash under MARPOL Annex II?
- A. Clean windows
- B. Polish steel
- C. Remove high-viscosity or solidifying Category X / Y residues to shore reception
- D. Wash deck
22. What is the Permanganate Time Test used for in chemical tank cleaning?
- A. Test oxygen concentration
- B. Test fuel sulfur
- C. Test water temp
- D. Detect trace presence of oxidizable organic impurities after cleaning for high-purity alcohol cargoes
23. What code specifies medical emergency response steps for chemical accidents on ships?
- A. SOLAS Chapter V
- B. STCW Reg I/9
- C. MARPOL Annex VI
- D. Medical First Aid Guide (MFAG)
24. What type of cargo pump is fitted inside individual stainless steel chemical cargo tanks?
- A. Deepwell centrifugal pump
- B. Steam duplex pump
- C. Hand pump
- D. Gear pump
25. Why is water prohibited for cleaning tanks after carrying Concentrated Sulfuric Acid?
- A. Water freezes
- B. Water turns steel into wood
- C. Water reacts exothermically generating extreme heat and corrosive splattering
- D. Water turns acid into rock
26. What is a Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk?
- A. Crew medical fitness
- B. Engine overhaul certificate
- C. Statutory certificate listing all specific chemical products approved for carriage
- D. Pilot license
27. What is the function of inert gas on chemical tankers carrying cargoes with flashpoints below 60°C?
- A. Change color
- B. Dissolve fumes
- C. Maintain oxygen concentration below 8% to prevent flammability
- D. Heat cargo
28. What hazard is associated with Benzene cargo exposure?
- A. Turns skin blue
- B. Known human carcinogen causing leukemia and bone marrow damage
- C. Heavy metal poisoning
- D. Non-toxic
29. What is closed gauging on a chemical tanker?
- A. Opening tank lids
- B. Measuring by draft
- C. Eye sight measuring
- D. Measuring cargo level using vapor-tight devices without releasing toxic vapors
30. What chemical condition causes Phenol to solidify at temperatures below 40°C?
- A. Nitrogen reaction
- B. High melting point (~41°C) requiring continuous heating during transit
- C. High water content
- D. Evaporation
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