QMED Oiler Practice Test

The first engine-room rating most people get: diesels, pumps, purifiers and watchstanding below deck. Coast Guard exam code QMED03.

126 real questions from the Coast Guard National Maritime Center's public sample exams, free. Each module needs 70% to pass.

Passing score: Coast Guard pass marks module by module, and the retest rules

What's free: daily rounds, the Brig, the drills and the Pass Meter, for every license. Your first module test is free too. After that, the full Exam Room is $19, once. No subscription.

What's on the test

10 sample questions

1. What is used to prevent contamination of a potable water system supplying a plumbing fixture such as a galley sink from a backup of sewage sanitary drains?

   • A.Location of the potable water spigots below the rim of the galley sink.
   • B.A "P" trap in the drain line draining sewage waste from the galley sink.
   • C.Location of the potable water spigots above the rim of the galley sink.
   • D.Check valves in the potable water supply lines delivering water to the galley sink.
   Show answer

   C. Location of the potable water spigots above the rim of the galley sink.

   Q800, Junior Engineer, Part I

2. For any piece of equipment requiring lubrication, what is the single most important lubricating oil property in meeting the operating conditions?

   • A.Flash point
   • B.Viscosity
   • C.Total base number
   • D.Pour point
   Show answer

   B. Viscosity

   Q801, Junior Engineer, Part II

3. The load is always placed on the lower half of the main bearings in a __________.

   • A.two-stroke cycle engine
   • B.four-stroke cycle engine
   • C.reverse cycle engine
   • D.double acting engine
   Show answer

   A. two-stroke cycle engine

   Q800, Junior Engineer, Part I

4. When performing routine AC motor maintenance what should be included?

   • A.verifying RPM if a synchronous motor
   • B.rotor balance check
   • C.inspection of the motor's internals for loose rotor bars or field poles
   • D.temperature readings at normal loads to detect abnormal temperature rises
   Show answer

   D. temperature readings at normal loads to detect abnormal temperature rises

   Q801, Junior Engineer, Part II

5. What will be the FIRST thing to occur if both the main and standby lube oil pumps failed to operate on a geared main propulsion steam turbine operating at full sea speed?

   • A.Ahead throttle will close.
   • B.Vacuum will be lost.
   • C.Shaft brake will engage.
   • D.Lube oil sump will overflow.
   Show answer

   A. Ahead throttle will close.

   Q800, Junior Engineer, Part I

6. On a ship with a continuously manned engine room, with a three-person watch rotation, what is the watch and rest period rotation?

   • A.4 hours on watch followed by 8 hours rest
   • B.6 hours on watch followed by 6 hours rest
   • C.8 hours on watch followed by 4 hours rest
   • D.8 hours on watch followed by 8 hours rest
   Show answer

   A. 4 hours on watch followed by 8 hours rest

   Q801, Junior Engineer, Part II

7. For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because __________.

   • A.changing filter elements would not interrupt engine operation
   • B.filtering occurs twice in each pass of oil through the system
   • C.clogging will not occur
   • D.dropping pressure is half of that through a single filter unit
   Show answer

   A. changing filter elements would not interrupt engine operation

   Q800, Junior Engineer, Part I

8. Which of the following statements is correct concerning antifriction bearings installed on pumps?

   • A.They are usually pressed onto their shafts.
   • B.The inner race should be free to turn on the shaft.
   • C.Alignment is not a critical factor in their installation.
   • D.The outer race should be free to turn in its housing.
   Show answer

   A. They are usually pressed onto their shafts.

   Q801, Junior Engineer, Part II

9. In an auxiliary diesel engine "bypass type" lubricating oil system, the main lube oil pump forces __________.

   • A.some of the oil used by the engine through a filter
   • B.some of the oil used by the engine through a centrifuge
   • C.all of the oil used by the engine through a filter
   • D.all of the oil used by the engine through a centrifuge
   Show answer

   A. some of the oil used by the engine through a filter

   Q800, Junior Engineer, Part I

10. Which of the following methods is a convenient and effective system of examining the body of an injury victim?

    • A.Compare the corresponding parts of the body.
    • B.Watch the patient's eyes as you probe parts of the body.
    • C.Look for discoloration of the patient's skin.
    • D.Look for uncontrolled vibration or twitching of parts of the body.
    Show answer

    A. Compare the corresponding parts of the body.

    Q801, Junior Engineer, Part II

What the study guide does

• Short daily rounds of 10 questions, with a streak.
• Practice tests built like the real one, scored with the real pass marks (first one free, then $19 once for the full Exam Room).
• The Brig: questions you miss come back until you get them right twice.
• Pass Meter: your chance of passing every module if you sat it today, worked out from your own answers.