Deck · 2026 NMC sample exam Q456–Q457
Tank Vessel – Assistant Practice Test
Every module on the National Maritime Center's 2026 sample examination for Tank Vessel – Assistant: 2 modules, 99 real questions, graded instantly.
The Tank Vessel – Assistant exam is split into 2 modules, each graded separately. The table below is the National Maritime Center's own 2026 sample examination for this credential, module by module, with every question matched to our bank of released U.S. Coast Guard exam questions. Open a module to practice its questions one at a time, or sit the whole module as a timed exam.
What is on the Tank Vessel – Assistant exam
| Module | Questions | Illustrations | Practice |
|---|---|---|---|
| Q456 Tankship Dangerous Liquids | 49 | 0 | Practice → |
| Q457 Tankship Liquefied Gases | 50 | 0 | Practice → |
| Total | 99 | 0 |
Most modules require 70 percent to pass; Rules of the Road modules require 90 percent.
Q456 · 49 questions
Tankship Dangerous Liquids
- 1. On tankers ullages are measured from what point?
- 2. The condition of asphyxia arises from which of the following?
- 3. What are flame screens used for?
- 5. Your tank vessel is fully loaded to the marks, and you find that she is down slightly by the head. Which of the following choices would be the best action to ta...
- 6. What do the emergency shutdown requirements of U.S. regulations apply to?
Showing the first 5 of 49. Start at question 1 and use Next to work through the module →
Q457 · 50 questions
Tankship Liquefied Gases
- 1. Which of the following is the pipe used to connect two separate piping systems on a tank vessel?
- 2. Which of the following is equivalent to a "barrel", which is a unit of liquid measure?
- 3. What is the lowest temperature at which a liquid will give off sufficient vapors to form a flammable mixture with air?
- 4. LNG is carried at approximately what temperature?
- 5. If you observe any situation which presents a safety or pollution hazard during the fuel transfer operations, which action should you take FIRST?
Showing the first 5 of 50. Start at question 1 and use Next to work through the module →
Tank Vessel – Assistant exam FAQ
Q How many questions are on the Tank Vessel – Assistant exam?
The National Maritime Center's 2026 sample examination for Tank Vessel – Assistant has 99 questions across 2 modules: Q456 Tankship Dangerous Liquids (49 questions) and Q457 Tankship Liquefied Gases (50 questions). Every one is multiple choice with four answers, and you can practice all of them on this page.
Q What modules are on the Tank Vessel – Assistant exam?
The modules are Q456 Tankship Dangerous Liquids (49 questions) and Q457 Tankship Liquefied Gases (50 questions). Each module is graded separately, so you need to pass every one to pass the exam.
Q What score do I need to pass the Tank Vessel – Assistant exam?
Most USCG exam modules require 70 percent to pass; Rules of the Road modules, where they apply, require 90 percent. Check the specific requirements for your endorsement with the National Maritime Center.
Q Are these the real questions?
Yes. They are the questions on the National Maritime Center's published 2026 sample examination for Tank Vessel – Assistant (modules Q456–Q457), matched to our bank of released U.S. Coast Guard exam questions. The exam you sit draws from the same pools.
Q Can I take a timed Tank Vessel – Assistant practice exam?
Yes. Subscribers can sit any module as an official sample exam in its published order, timed or untimed, with answers revealed at the end. Free accounts can build one 10-question practice exam and answer questions on every module page.
Other deck practice tests
- Deck Officer Endorsements 118 questions
- Master/Chief Mate of Unlimited Tonnage 360 questions
- Second/Third Mate of Unlimited Tonnage 320 questions
- Master Less than 500-1600 Gross Registered Tons 580 questions
- Second Mate to Master Less than 1600 Gross Registered Tons 80 questions
- Master TV to Master Less than 500 Gross Registered Tons Oceans or Near Coastal 105 questions
- Mate Less than 500-1600 Gross Registered Tons 699 questions
- Master or Mate Less than 200 Gross Registered Tons 360 questions
Ready to pass the Tank Vessel – Assistant exam?
Sign up free to track the questions you miss, then subscribe to sit every module as a timed exam in the National Maritime Center's published order.