Engine · 2026 NMC sample exam Q715–Q717
MODU – Assistant Engineer Practice Test
Every module on the National Maritime Center's 2026 sample examination for MODU – Assistant Engineer: 3 modules, 149 real questions, graded instantly.
The MODU – Assistant Engineer exam is split into 3 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 MODU – Assistant Engineer exam
| Module | Questions | Illustrations | Practice |
|---|---|---|---|
| Q715 Motor Plants | 49 | 13 | Practice → |
| Q716 Engineering Safety & Environmental Protection | 50 | 2 | Practice → |
| Q717 General Subjects | 50 | 14 | Practice → |
| Total | 149 | 29 |
Most modules require 70 percent to pass; Rules of the Road modules require 90 percent.
Q715 · 49 questions · 13 illustrations
Motor Plants
- 1. What is defined as the average pressure exerted on a piston during each power stroke?
- 2. What type of combustion cycle do modern marine diesel engines equipped with mechanical fuel injection operate on?
- 3. Why must fuel droplets injected into a diesel engine cylinder have adequate penetration?
- 4. Which of the following is responsible for generating heat for igniting the fuel oil in the cylinder of a diesel engine?
- 5. In a diesel engine, fuel combustion begins just before top dead center. What then happens with regard to combustion?
Showing the first 5 of 49. Start at question 1 and use Next to work through the module →
Q716 · 50 questions · 2 illustrations
Engineering Safety & Environmental Protection
- 1. A flat block placed under the end of a shore for the purpose of distributing pressure is referred to as a __________.
- 2. An acceptable method of temporarily sealing a crack formed in the hull of a vessel is to __________.
- 3. Which type of respiratory protection is preferable for the repair/investigation personnel in a hydrogen sulfide (H2S) environment?
- 4. A rigid lifesaving device designed for a group of survivors to hold on to while in the water is defined as a _______.
- 5. Which of the following statements is TRUE concerning life jackets?
Showing the first 5 of 50. Start at question 1 and use Next to work through the module →
Q717 · 50 questions · 14 illustrations
General Subjects
- 1. The gas that exists in the stratosphere forming a protective shield that helps to protect the environment from the harmful effects ultraviolet radiation is call...
- 2. What is the pressure and condition of the refrigerant entering the receiver of a refrigeration system?
- 3. A device used to hold open the refrigeration compressor suction valve during starting to reduce the compression load is called what?
- 4. In a refrigeration system featuring low-side pumpdown prior to the automatic shut down of the compressor, the temperature of the refrigerated space is controlle...
- 5. Through which of the components shown in the illustration is flash gas formation a normal occurrence?
Showing the first 5 of 50. Start at question 1 and use Next to work through the module →
MODU – Assistant Engineer exam FAQ
Q How many questions are on the MODU – Assistant Engineer exam?
The National Maritime Center's 2026 sample examination for MODU – Assistant Engineer has 149 questions across 3 modules: Q715 Motor Plants (49 questions), Q716 Engineering Safety & Environmental Protection (50 questions) and Q717 General Subjects (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 MODU – Assistant Engineer exam?
The modules are Q715 Motor Plants (49 questions), Q716 Engineering Safety & Environmental Protection (50 questions) and Q717 General Subjects (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 MODU – Assistant Engineer 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 MODU – Assistant Engineer (modules Q715–Q717), 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 MODU – Assistant Engineer 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 engine practice tests
Ready to pass the MODU – Assistant Engineer 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.