QMED Electrician / Refrigerating Engineer Practice Test

Generators, motors and switchboards, plus the ship's reefer and A/C plant. Coast Guard exam code QMED02.

113 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. You have abandoned ship and are in charge of a liferaft. How much water per day should you permit each occupant to drink after the first 24 hours?

   • A.1 quart
   • B.1 gallon
   • C.1 pint
   • D.1 can
   Show answer

   C. 1 pint

   Q445, Lifeboat Operator

2. If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the __________.

   • A.control air system
   • B.forced draft air system
   • C.supply air system
   • D.ships service air system
   Show answer

   A. control air system

   Q800, Junior Engineer, Part I

3. One function of the air receiver in a compressed air system is to __________.

   • A.receive exhaust air from pneumatic accessories
   • B.minimize the system's line pulsations
   • C.remove all traces of oil from the air
   • D.dry the air discharged from the intercooler
   Show answer

   B. minimize the system's line pulsations

   Q800, Junior Engineer, Part I

4. The blade for a power hacksaw should be installed with the teeth __________.

   • A.pointing toward the motor end of the machine
   • B.pointing either toward or away from the motor end of the machine
   • C.pointing toward the motor if using a 4 or 6 tooth blade and away from the motor if using a 10 or 14 tooth blade
   • D.pointing away from the motor end of the machine
   Show answer

   A. pointing toward the motor end of the machine

   Q801, Junior Engineer, Part II

5. The basic function of the centrifugal pump impeller is to __________.

   • A.convert the potential energy of the liquid to kinetic energy
   • B.directly increase the pressure of the liquid being pumped
   • C.directly increase the velocity of the liquid being pumped
   • D.separate air from the liquid being pumped
   Show answer

   C. directly increase the velocity of the liquid being pumped

   Q800, Junior Engineer, Part I

6. When installing DANGER tags when performing a tag-out and lock-out procedure in preparation for accomplishing maintenance, what is the color of these tags?

   • A.Orange
   • B.Yellow
   • C.Red
   • D.Green
   Show answer

   C. Red

   Q801, Junior Engineer, Part II

7. A digital multimeter, set up as a milliammeter on the 100-milliamp scale, is known to have an accuracy of plus or minus 2%, based on full scale. A meter reading of 5.0 milliamps would indicate an actual line current between what two values?

   • A.4.9 and 5.1 milliamperes
   • B.4.8 and 5.2 milliamperes
   • C.4.5 and 5.5 milliamperes
   • D.4.0 and 6.0 milliamperes
   Show answer

   B. 4.8 and 5.2 milliamperes

   Q801, Junior Engineer, Part II

8. In general, the thermal bulb for a thermal expansion valve used in a reciprocating air conditioning system is usually charged with what substance?

   • A.mercuric sulfate
   • B.bees wax
   • C.the same refrigerant as the system
   • D.distilled water
   Show answer

   C. the same refrigerant as the system

   Q801, Junior Engineer, Part II

9. To prevent oil from escaping into the sea when ballasting through the cargo piping system, you should FIRST __________.

   • A.open sluice valves, then start the cargo pump
   • B.start the cargo pump, then open sea suction valves
   • C.open sea suction valves, then start the cargo pump
   • D.open block valves, then start the cargo pump
   Show answer

   B. start the cargo pump, then open sea suction valves

   Q801, Junior Engineer, Part II

10. For most multi-box refrigeration systems, the refrigerant sight glass would be located where in the system?

    • A.after the condenser in the drain line to the receiver
    • B.before the compressor in the suction line
    • C.after the compressor in the discharge line
    • D.after the receiver in the liquid line
    Show answer

    D. after the receiver in the liquid line

    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.