100+ Free USCG QMED Practice Questions
Pass your USCG Qualified Member of the Engine Department (QMED) exam on the first try — instant access, no signup required.
Which of the following is the most serious immediate hazard if a steaming boiler's water level drops below the bottom of the gauge glass?
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Key Facts: USCG QMED Exam
5
Separate QMED Rating Exams
USCG NMC examination structure
140
Questions per Rating
Two 70-question modules
70%
Passing Score Each Module
USCG QMED exam policy
$95
Exam Fee per Rating
NMC fee schedule
3.5 hrs
Max Time per Module
USCG deck and engineering guide
Jan 28, 2026
ASAP Portal Rollout
NMC ASAP notice
As of May 2026, the Coast Guard still administers QMED endorsements as five separate two-module written exams, with 140 questions per rating and a 70% passing score per module. There is no consolidated single QMED test - the 'QMED Any Rating' endorsement is the result of completing all five rating sets (Oiler, Fireman/Watertender, Electrician/Refrigerating Engineer, Pumpman/Machinist, and Junior Engineer). The main 2026 process changes affecting QMED applicants are Pay.gov fee payment (since January 19, 2025) and the NMC ASAP application portal that became the current application route on January 28, 2026.
Sample USCG QMED Practice Questions
Try these sample questions to test your USCG QMED exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1In a four-stroke marine diesel engine, what are the four strokes in correct order?
2What ignites the fuel in a diesel engine cylinder?
3What is the primary purpose of a fuel injection nozzle in a marine diesel engine?
4Black exhaust smoke from a marine diesel engine most often indicates which condition?
5Blue exhaust smoke from a diesel engine most likely indicates:
6What is the function of a turbocharger on a marine diesel engine?
7An air intercooler (charge air cooler) located between the turbocharger and the engine cylinders is used to:
8The compression ratio of a diesel engine is best defined as the ratio of:
9If a four-stroke diesel engine has a bore of 6 inches and a stroke of 8 inches, what is the displacement per cylinder, rounded to the nearest cubic inch?
10What is the primary purpose of a governor on a diesel engine?
About the USCG QMED Exam
The USCG Qualified Member of the Engine Department (QMED) credential covers engine-room ratings on commercial U.S. flag vessels. There are five separate QMED rating tracks - Oiler (Q804 + Q805), Fireman/Watertender (Q806 + Q807), Electrician/Refrigerating Engineer (Q808 + Q809), Pumpman/Machinist (Q802 + Q803), and Junior Engineer (Q800 + Q801). Each rating is its own two-module written exam of 140 questions (two 70-question modules), and each module must be passed at 70%. The 'QMED Any Rating' endorsement is earned by passing all five rating sets.
Assessment
Each QMED rating is its own separately graded two-module exam totaling 140 questions (two 70-question modules). The five rating tracks use distinct module numbers: Oiler (Q804 + Q805), Fireman/Watertender (Q806 + Q807), Electrician/Refrigerating Engineer (Q808 + Q809), Pumpman/Machinist (Q802 + Q803), and Junior Engineer (Q800 + Q801). The 'QMED Any Rating' endorsement requires passing all five rating sets.
Time Limit
Up to 3.5 hours per module per current NMC deck and engineering guide
Passing Score
70% each module
Exam Fee
$95 examination fee per rating; $240 typical original endorsement total (U.S. Coast Guard Regional Examination Centers (RECs) / National Maritime Center)
USCG QMED Exam Content Outline
Junior Engineer (140 questions)
Most comprehensive QMED exam, covering motor and steam propulsion theory, fuel and lube oil service systems, auxiliary machinery, electrical systems, and watchstanding. Often used as a stepping stone toward officer-level engineering credentials.
Oiler (140 questions)
Focused on engine-room watchstanding, lubrication, bearings, cooling systems, basic auxiliary operation, and the practical maintenance support an oiler performs under the engineer of the watch.
Fireman/Watertender (140 questions)
Boiler-centric exam covering watertube and firetube boilers, water level control, safety valves, blowdown, feedwater treatment, deaeration, economizers, superheaters, and low-water emergency procedures.
Electrician/Refrigerating Engineer (140 questions)
Combined exam on AC generator paralleling, automatic voltage regulators, motor troubleshooting, grounding and ungrounded marine systems, the vapor-compression refrigeration cycle, refrigerant handling under EPA Section 608, and HVAC operation.
Pumpman/Machinist (140 questions)
Pump and piping focused exam covering centrifugal and positive-displacement pumps, valves, priming, cavitation and NPSH, plus general machinist work and cargo-system pumping aboard tankers.
How to Pass the USCG QMED Exam
What You Need to Know
- Passing score: 70% each module
- Assessment: Each QMED rating is its own separately graded two-module exam totaling 140 questions (two 70-question modules). The five rating tracks use distinct module numbers: Oiler (Q804 + Q805), Fireman/Watertender (Q806 + Q807), Electrician/Refrigerating Engineer (Q808 + Q809), Pumpman/Machinist (Q802 + Q803), and Junior Engineer (Q800 + Q801). The 'QMED Any Rating' endorsement requires passing all five rating sets.
- Time limit: Up to 3.5 hours per module per current NMC deck and engineering guide
- Exam fee: $95 examination fee per rating; $240 typical original endorsement total
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
USCG QMED Study Tips from Top Performers
Frequently Asked Questions
What is the USCG QMED credential?
QMED stands for Qualified Member of the Engine Department. It is the Coast Guard rating endorsement for unlicensed engine-room crewmembers on commercial vessels. The QMED is not a single exam - it is a family of five separately tested ratings: Oiler, Fireman/Watertender, Electrician/Refrigerating Engineer, Pumpman/Machinist, and Junior Engineer.
How many questions are on a QMED exam?
Each QMED rating is administered as two 70-question modules, totaling 140 questions per rating. For Junior Engineer, those modules are Q800 and Q801; for Oiler, Q804 and Q805; for Fireman/Watertender, Q806 and Q807; for Electrician/Refrigerating Engineer, Q808 and Q809; and for Pumpman/Machinist, Q802 and Q803.
What passing score do I need?
You must score at least 70% on each module of each rating exam. Unlike some deck exams, QMED ratings do not have a higher 90% module - the bar is 70% across the board, but every module must be passed independently.
How long is each module?
Under the current NMC deck and engineering guide, candidates may be allowed up to 3.5 hours per module. Because each rating is two modules, plan for a full testing day or split sessions if you are stacking multiple rating exams.
What is QMED 'Any Rating'?
The 'QMED Any Rating' endorsement is the result of holding all five individual QMED ratings (Oiler, Fireman/Watertender, Electrician/Refrigerating Engineer, Pumpman/Machinist, and Junior Engineer). There is no single Any Rating exam - it is earned cumulatively by passing each of the five two-module sets.
How much does a QMED exam cost?
The current NMC fee schedule lists a $95 examination fee per rating, plus the standard $100 evaluation and $45 issuance fee, totaling roughly $240 for an original endorsement. Stacking multiple QMED ratings adds additional examination fees for each rating exam.
What changed for QMED applicants in 2026?
The Coast Guard did not publish a separate 2026 QMED exam blueprint change. The current process changes affecting QMED applicants are the Pay.gov fee shift on January 19, 2025 and the NMC ASAP application portal, which became the current online application route on January 28, 2026.
Where do QMED exams take place?
QMED exams are administered in person at U.S. Coast Guard Regional Examination Centers (RECs). Remote testing is not offered for these examinations. Once your MMC application is approved, the NMC schedules your exam at the REC you selected.