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USCG Tankerman Assistant (Dangerous Liquids) Practice Test

50 Tankerman Assistant (Dangerous Liquids) questions from the National Maritime Center’s published sample exams for Tank Vessel – Assistant, each with the NMC’s answer key. Questions that need an illustration, a chart or a reference book are left out.

46 CFR now calls this endorsement Tank Vessel-Assistant: the Coast Guard replaced the Tankerman titles in 2024 (89 FR 93040).

40 of them come with the closest regulation or reference section, shown with the answer.

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10 sample Tankerman Assistant (Dangerous Liquids) questions with answers

The same 10 on every visit. A related section is the closest match RegKnot found in the regulations and references; it is not part of the NMC’s answer key.

Question 1 · Tank Vessel – Assistant
Which of the following describes the flash point temperature of a liquid?
- A.at which a liquid will explode
- B.at which a liquid will give off inflammable vapors (correct answer)
- C.that a liquid must reach before it will flow readily
- D.at which a liquid will burn steadily
Answer: B. at which a liquid will give off inflammable vapors
Related regulation: IMDG 2.3.3 — Determination of flashpoint
Question 2 · Tank Vessel – Assistant
On a tanker vessel, what is the required combined capacity of the inert gas generating system as compared to the total capacity of all the cargo pumps which can be operated simultaneously?
- A.50%
- B.75%
- C.100%
- D.125% (correct answer)
Answer: D. 125%
Related regulation: 46 CFR 154.806 ↗ — Capacity of pressure relief valves
Question 3 · Tank Vessel – Assistant
Who completes the Declaration of Inspection before loading a tank vessel?
- A.The American Bureau of Shipping.
- B.The designated person in charge. (correct answer)
- C.The manager of the shore facility.
- D.The US Coast Guard.
Answer: B. The designated person in charge.
Related regulation: 46 CFR 35.35-30 ↗ — “Declaration of Inspection” for tank vessels—TB/ALL
Question 4 · Tank Vessel – Assistant
How can you determine which grades of cargo a tank vessel is permitted to carry?
- A.examine the cargo tanks and fittings
- B.ask the terminal supervisor or his representative
- C.check the loading order
- D.refer to the vessel's Certificate of Inspection (correct answer)
Answer: D. refer to the vessel's Certificate of Inspection
Related regulation: USCG MSM 16000.70 Ch.3 — Marine Safety — Marine Inspection Administration — Ch.3 DOCUMENTATION OF VESSEL INSPECTIONS
Question 5 · Tank Vessel – Assistant
How is an inert gas system designed to reduce the possibility of tank explosions?
- A.by removing all hydrocarbon gases from the cargo tanks
- B.by reducing the oxygen concentration below levels necessary for combustion (correct answer)
- C.by blanketing cargo tanks with inert foam
- D.by eliminating sparks and fire in the vicinity of cargo tanks
Answer: B. by reducing the oxygen concentration below levels necessary for combustion
Related regulation: 46 CFR 153.500 ↗ — Inert gas systems
Question 6 · Tank Vessel – Assistant
Who enforces the U.S. pollution regulations that apply to ships?
- A.State Pollution Board
- B.Port Authority
- C.U.S. Coast Guard (correct answer)
- D.Corps of Engineers
Answer: C. U.S. Coast Guard
Related regulation: NVIC 08-83 §3 — Guidance for Compliance with Annex I of the International Convention for the Prevention of Pollution from Ships, 1973, as Modified by the Protocol of 1978 Relating Thereto (MARPOL 73/78) — DISCUSSION.
Question 7 · Tank Vessel – Assistant
In an inert gas system, high pressure alarms are set in the main vapor collection line to cause an audible and visual alarm if the pressure reaches a certain level. What is the percentage of the lowest relief valve setting at which the alarm must sound?
- A.70%
- B.80%
- C.90% (correct answer)
- D.95%
Answer: C. 90%
Related regulation: 33 CFR 154.2103 ↗ — Facility requirements for vessel vapor overpressure and vacuum protection
Question 8 · Tank Vessel – Assistant
What do the designations A, B, C, D, and E refer to in grades of cargo?
- A.pour point, color, and viscosity index of petroleum products
- B.grades of crude oil
- C.flash point range and Reid vapor pressure index of petroleum products (correct answer)
- D.degrees of quality of petroleum products
Answer: C. flash point range and Reid vapor pressure index of petroleum products
Related regulation: 46 CFR 56.04-2 ↗ — Piping classification according to service
Question 9 · Tank Vessel – Assistant
U.S. regulations state that a person may not transfer oil or hazardous materials to or from a vessel unless each person in charge has signed which of the following documents?
- A.machinery log
- B.Oil Record Book
- C.valve inspection record
- D.Declaration of Inspection (correct answer)
Answer: D. Declaration of Inspection
Related regulation: 33 CFR 156.150 ↗ — Declaration of inspection
Question 10 · Tank Vessel – Assistant
What causes the most frequent incidents of pollution during tanker operations?
- A.routine discharge of oil during ballasting and tank crude oil washing
- B.groundings
- C.loading operations (correct answer)
- D.collisions
Answer: C. loading operations
Related regulation: NVIC 01-81 Encl.2 — Guidance for Enforcement of the Requirements of the Port and Tanker Safety Act of 1978(PTSA) Pertaining to SBT, CBT, COW, IGS, Steering Gear, and Navigation Equipment for Tank Vessels — Enclosure (2)

Exams these questions come from

Tank Vessel – Assistant50 questions

Requirements for the endorsement

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The questions and answer keys are from the U.S. Coast Guard National Maritime Center’s published sample exams. RegKnot is not affiliated with the U.S. Coast Guard or the National Maritime Center. A practice score does not predict your exam result; check the NMC for current exam requirements.

USCG Tankerman Assistant (Dangerous Liquids) Practice Test

Take a 10-question quiz

10 sample Tankerman Assistant (Dangerous Liquids) questions with answers

Which of the following describes the flash point temperature of a liquid?

On a tanker vessel, what is the required combined capacity of the inert gas generating system as compared to the total capacity of all the cargo pumps which can be operated simultaneously?

Who completes the Declaration of Inspection before loading a tank vessel?

How can you determine which grades of cargo a tank vessel is permitted to carry?

How is an inert gas system designed to reduce the possibility of tank explosions?

Who enforces the U.S. pollution regulations that apply to ships?

In an inert gas system, high pressure alarms are set in the main vapor collection line to cause an audible and visual alarm if the pressure reaches a certain level. What is the percentage of the lowest relief valve setting at which the alarm must sound?

What do the designations A, B, C, D, and E refer to in grades of cargo?

U.S. regulations state that a person may not transfer oil or hazardous materials to or from a vessel unless each person in charge has signed which of the following documents?

What causes the most frequent incidents of pollution during tanker operations?