Assistant Engineer UFIV Practice Test (Fishing Vessels, UFIV02)

Assistant engineer on big fishing boats, processors and tenders (UFIV): motor plants, safety, general subjects. Coast Guard exam code UFIV02.

146 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

Picture questions link to the drawing in the Coast Guard's free sample PDF. A few that need reference tables are left out.

10 sample questions

1. If the water level as indicated by the gauge glass of an auxiliary boiler is in question, it should be blown down. Which of the following statements represents the proper procedure for performing a gauge glass blow down?

   • A.The gauge glass should be blown down twice; first with the upper cut-out valve open and then with the lower cut-out valve open.
   • B.The gauge glass should be blown down once with the lower cut-out valve open.
   • C.The gauge glass should be blown down twice; first with the lower cut-out valve open and then with the upper cut-out valve open.
   • D.The gauge glass should be blown down once with both the upper cut-out and lower cut-out valves open simultaneously.
   Show answer

   C. The gauge glass should be blown down twice; first with the lower cut-out valve open and then with the upper cut-out valve open.

   Q610, Assistant Engineer Limited: Motor Plants

2. The advantage of using a dry chemical fire extinguishing agent is __________.

   • A.its excellent cooling ability
   • B.permanent extinguishment regardless of the reignition sources
   • C.its good stability and non-toxicity
   • D.all of the above
   Show answer

   C. its good stability and non-toxicity

   Q801, Junior Engineer, Part II

3. What is the physical state and pressure condition of refrigerant as it leaves a receiver in a typical refrigeration system?

   • A.high-pressure liquid
   • B.low-pressure vapor
   • C.low-pressure liquid
   • D.high-pressure vapor
   Show answer

   A. high-pressure liquid

   Q801, Junior Engineer, Part II

4. Due to the questionable mineral content of fresh water taken on from shore as a source of make-up water for diesel engine closed, recirculating cooling water systems, besides chemical treatment and coolant testing, what is the best line of defense in minimizing cooling system problems?

   • A.Maintaining cooling water temperatures at lower-than-normal values
   • B.Maintaining cooling water temperatures at higher-than-normal values
   • C.Maintaining a tight system and promptly repairing leaks
   • D.Increasing the frequency of draining, flushing, and re-filling the system
   Show answer

   C. Maintaining a tight system and promptly repairing leaks

   Q650, Assistant Engineer OSV: Motor Plants

5. An oxygen indicator will detect __________.

   • A.the presence of harmful amounts of carbon monoxide
   • B.concentrations of explosive gas
   • C.an oxygen deficiency in a space
   • D.all of the above
   Show answer

   C. an oxygen deficiency in a space

   Q805, Oiler, Part II

6. Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.

   • A.reservoir expansion chamber
   • B.atmosphere as heat
   • C.fluid as friction
   • D.hydraulic piping flexibility
   Show answer

   B. atmosphere as heat

   Q802, Electrician

7. For diesel engines, such as those used for main propulsion and auxiliary power on fishery research vessels, while running at speed, how is the ignition of fuel within the cylinder achieved?

   • A.Ignition is achieved by intense heat by passing electric current through the element of a specially designed glow plug.
   • B.Ignition is achieved by the heat of compression created by compressing intake/charge air within the cylinder into a relatively small volume.
   • C.Ignition is achieved by the heat of compression created by compressing the air/fuel mixture within the cylinder into a relatively small volume.
   • D.Ignition is achieved by a high voltage electric spark induced across the gap of a specially designed spark plug.
   Show answer

   B. Ignition is achieved by the heat of compression created by compressing intake/charge air within the cylinder into a relatively small volume.

   Q690, Assistant Engineer UFIV: Motor Plants

8. Which of the following procedures reduces the possibility of an interior ventilation duct fire from rapidly spreading?

   • A.Keeping the duct interior clean.
   • B.Keeping the duct exterior clean.
   • C.Having a portable CO2 ready at each duct opening.
   • D.Having a fire hose charged at each duct opening.
   Show answer

   A. Keeping the duct interior clean.

   Q806, Fireman / Watertender

9. If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are sea water-cooled, what statement is true?

   • A.Sea water flows through the tubes of the jacket water cooler and through the shell of the lube oil cooler.
   • B.Sea water flows through the tubes of both the lube oil and jacket water coolers.
   • C.Sea water flows through the tubes of the lube oil cooler and through the shell of the jacket water cooler.
   • D.Sea water flows through the shells of both the lube oil and jacket water coolers.
   Show answer

   B. Sea water flows through the tubes of both the lube oil and jacket water coolers.

   Q803, Refrigerating Engineer

10. When checking the crankcase oil level on a main propulsion engine on your fishing industry line vessel while underway, what should be the oil level as indicated on the dipstick?

    • A.The actual level is unimportant as long as it is visible on the dipstick when the engine is running.
    • B.The level should be between the "full" and "add" marks on the side of the dipstick marked with engine IDLE and oil HOT.
    • C.The level should be below the "add" mark on the side of the dipstick marked with engine IDLE and oil HOT.
    • D.The level should be well above the "full" mark on the side of the dipstick marked with engine IDLE and oil HOT.
    Show answer

    B. The level should be between the "full" and "add" marks on the side of the dipstick marked with engine IDLE and oil HOT.

    Q690, Assistant Engineer UFIV: Motor Plants

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.