National Maritime Center - Serving Our Nation's Mariners U.S.C.G. Merchant Marine Exam
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National Maritime Center
Serving Our Nation’s Mariners
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Q534 Engineering Safety
(Sample Examination)
8/18/2021 Page 1 of 19
Q534 Engineering Safety
Q534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
Choose the best answer to the following Multiple Choice Questions:
1. In a compartment that has been completely flooded with water, the greatest pressure will be exerted
__________.
• (A) along the bottom of any bulkhead
o (B) at a point that is one-third from the bottom of the bulkhead
o (C) along the top of the bulkhead
o (D) at the vertical center of the bulkhead
If choice A is selected set score to 1.
2. Progressive flooding in the engine room may be minimized by securing watertight boundaries and
__________.
o (A) transferring reserve feedwater
o (B) evacuating the engine room
o (C) dumping fuel oil
• (D) pumping out flooded compartments
If choice D is selected set score to 1.
3. The wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from __________.
• (A) filling completely
o (B) collapsing
o (C) developing free surfaces
o (D) developing free surface moments
If choice A is selected set score to 1.
4. After an emergency shoring installation has been completed, the __________.
o (A) timbers are nailed in place to prevent looseness
o (B) damaged plating should be straightened by heating
o (C) repair is completed and no further action is needed
• (D) shoring should be frequently inspected for looseness
If choice D is selected set score to 1.
5. Which type of respiratory protection is preferable for the repair/investigation personnel in a hydrogen
sulfide (H2S) environment?
o (A) Emergency Escape Breathing Apparatus (EEBA)
o (B) Self-Contained Demand-Type Breathing Apparatus (SCDBA)
o (C) U.S. Navy Oxygen Breathing Apparatus (OBA)
• (D) Positive Self-Contained Breathing Apparatus (SCBA)
If choice D is selected set score to 1.
8/18/2021 Page 2 of 19
Q534 Engineering Safety
Q534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
6. Which of the following conditions represents a particular advantage of using a positive pressure type
self-contained breathing apparatus in an atmosphere that is immediately dangerous to life or health?
o (A) The equipment used is lightweight and easy to wear by reducing physical strain on the
wearer.
o (B) The average operating time for most air cylinders is over an hour.
o (C) The equipment is compact and the wearer can work in confined spaces without difficulty.
• (D) The positive pressure in the facepiece prevents contaminated air from entering the facepiece.
If choice D is selected set score to 1.
7. Kapok life jackets require proper care and should NOT be __________.
o (A) left on open decks
o (B) used as seats, pillows, or foot rests
o (C) stowed near open flame or where smoking is permitted
• (D) all of the above
If choice D is selected set score to 1.
8. The external flotation bladder on an immersion suit should be inflated __________.
o (A) before you enter the water
• (B) after you enter the water
o (C) after one hour in the water
o (D) after you notice that your suit is losing buoyancy
If choice B is selected set score to 1.
9. When lowering lifeboats as the vessel is pitching in heavy seas, a good practice is to rig frapping
lines __________.
o (A) on only the forward falls
o (B) on only the after falls
• (C) fore and aft with a lead of about 45° to the boat
o (D) from the falls to the tricing gear
If choice C is selected set score to 1.
10. The hand brake of a lifeboat winch is __________.
o (A) manually disengaged when hoisting a boat
• (B) applied by dropping the counterweighted lever
o (C) controlled by the centrifugal brake mechanism
o (D) automatically engaged if lowering speed is excessive
If choice B is selected set score to 1.
8/18/2021 Page 3 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
11. To activate an air regeneration canister on a survival craft, you __________.
o (A) put it into a container of water
• (B) tear off the tabs on the canister
o (C) turn it upside down
o (D) push "on" button
If choice B is selected set score to 1.
12. When inspecting a survival craft, you should check to make sure that the __________.
o (A) sea anchor is deployed
o (B) hydraulic starting system has been drained
• (C) hydraulic pressure is within the specified range
o (D) steering controls are locked
If choice C is selected set score to 1.
13. While adrift in an inflatable life raft in hot, tropical weather __________.
o (A) the canopy should be deflated so that it will not block cooling breezes
o (B) the pressure valve may be periodically opened to prevent excessive air pressure
• (C) deflating the floor panels may help to cool personnel
o (D) the entrance curtains should never be opened
If choice C is selected set score to 1.
14. The most important reason for taking anti-seasickness pills as soon as possible after entering a life
raft is to __________.
o (A) assist in sleeping
o (B) reduce appetite by decreasing nausea
• (C) prevent loss of body moisture by vomiting
o (D) prevent impaired judgment due to motion-induced deliriousness
If choice C is selected set score to 1.
15. Which of the following conditions represents the appropriate time for setting off distress flares and
rockets?
o (A) Immediately upon abandoning the vessel.
o (B) At half-hour intervals.
o (C) At one hour intervals.
• (D) Only when there is a chance of them being seen by rescue vessels.
If choice D is selected set score to 1.
8/18/2021 Page 4 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
16. Radiation can cause a fire to spread by __________.
o (A) transmitting the heat of a fire through the ship's metal
o (B) burning liquids flowing into another space
o (C) heated gases flowing through ventilation systems
• (D) the transfer of heat across an unobstructed space
If choice D is selected set score to 1.
17. The air flow depicted in figure 1 of the illustration is an example of which type of ventilation?
Illustration SF-0013
o (A) Parallel.
o (B) Vertical.
• (C) Combination.
o (D) Horizontal.
If choice C is selected set score to 1.
18. In figure 1 of the illustration, fire would spread to compartment "B" by __________. Illustration SF-
0013
o (A) convection
o (B) radiation
• (C) conduction
o (D) impingement
If choice C is selected set score to 1.
19. Which of the gases listed is the poisonous gas most likely to be found in a closed compartment
involved in a fire?
o (A) Nitrogen
o (B) Hydrogen
o (C) Carbon dioxide
• (D) Carbon monoxide
If choice D is selected set score to 1.
20. When combating a class "C" fire, which of the following dangers may be present?
• (A) Toxic fumes from burning insulation or electric shock
o (B) Water damage to machinery not involved in the fire
o (C) Flooding of the vessel
o (D) Increased surface area of the burning fluid
If choice A is selected set score to 1.
8/18/2021 Page 5 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
21. A burning mattress is considered as which of the following classes of fire?
• (A) Class "A"
o (B) Class "B"
o (C) Class "C"
o (D) Class "D"
If choice A is selected set score to 1.
22. A fire that has developed in a pile of rubber gasket material would be classified as a __________.
• (A) class "A"
o (B) class "B"
o (C) class "C"
o (D) class "D"
If choice A is selected set score to 1.
23. A magnesium fire would be classified as a __________.
o (A) class "A"
o (B) class "B"
o (C) class "C"
• (D) class "D"
If choice D is selected set score to 1.
24. The most likely location for a liquid cargo fire to occur on a tanker would be __________.
o (A) in the amidships house
o (B) at the main deck manifold
o (C) at the vent header
• (D) in the pumproom
If choice D is selected set score to 1.
25. Paints and solvents used aboard a vessel should be __________.
o (A) stowed safely at the work site until work is completed
o (B) covered with a fine mesh screen to protect from ignition sources
o (C) drained into a common container after each use
• (D) returned to the paint locker after each use
If choice D is selected set score to 1.
8/18/2021 Page 6 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
26. The component shown in the illustration would be installed in which of the following types of fire
detection systems? Illustration SF-0004
o (A) Rate-of-rise
o (B) Combined fixed temperature and rate-of-rise
• (C) Fixed temperature
o (D) Line-type pneumatic
If choice C is selected set score to 1.
27. When compared to other fire extinguishing agents, water fog __________.
o (A) has the greatest ability to produce foam
• (B) has the greatest cooling ability
o (C) will completely remove toxic fumes from the air
o (D) will completely remove combustible vapors from the air
If choice B is selected set score to 1.
28. When using foam, a "Class B" fire is extinguished by __________.
o (A) replacing the fuel
• (B) smothering the fire
o (C) cooling the surface
o (D) all of the above
If choice B is selected set score to 1.
29. Which of the following statements is true concerning the fire extinguisher shown in the illustration?
Illustration SF-0006
o (A) There is no danger of reflash in using the illustrated extinguisher on a class "B" fire.
o (B) The illustrated extinguisher must never be used in conjunction with water.
• (C) The agent may be applied in short bursts by squeezing and releasing the lever on the nozzle.
o (D) The initial discharge of the extinguisher should be at close range to scatter the burning
material.
If choice C is selected set score to 1.
30. Annual servicing of a hand portable CO2 fire extinguisher includes __________.
• (A) weighing the cylinder and recharging if weight loss exceeds 10% of the weight of the charge
o (B) hydrostatic testing of the cylinder
o (C) inspecting the pressure gauge to ensure the needle is within operating range
o (D) discharging, cleaning inside, and recharging
If choice A is selected set score to 1.
8/18/2021 Page 7 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
31. A low velocity fog applicator is retained in an all-purpose nozzle by a bayonet joint. The applicator is
prevented from rotating in the joint by __________.
o (A) water pressure
• (B) a spring-loaded catch
o (C) a keeper screw
o (D) a locknut
If choice B is selected set score to 1.
32. When the cotton cover of a fire hose becomes oily or greasy, it should be washed with a solution of
mild soapy fresh water and __________.
• (A) a soft-bristled brush
o (B) a wire brush
o (C) paint thinner
o (D) cornstarch
If choice A is selected set score to 1.
33. Which of the following components provides a direct source of sea water for the fire main system?
o (A) Rose box suction
o (B) Cofferdam sluice valve
• (C) Sea chest suction
o (D) Fire pump stuffing box
If choice C is selected set score to 1.
34. During cargo operations, a deck fire has occurred due to a leaking cargo line. You should FIRST
__________.
o (A) apply CO2 on the burning fuel at its source
o (B) prevent the spread of fire with a foam dam
• (C) stop the transfer of cargo
o (D) blanket the cargo spill with foam
If choice C is selected set score to 1.
35. The most effective method of extinguishing a class "A" fire is by __________.
o (A) using non-conducting extinguishers
• (B) quenching and cooling
o (C) blanketing and smothering
o (D) using a sodium based dry chemical
If choice B is selected set score to 1.
8/18/2021 Page 8 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
36. In firefighting, the term "protecting exposures" means __________.
o (A) keeping flames from burning at the tank vents
o (B) protecting exposed areas of the superstructure from flames
• (C) taking measures to prevent the spread of fire from the involved compartment to an adjacent
compartment
o (D) protecting firefighters from direct exposure to the heat of the fire
If choice C is selected set score to 1.
37. The fire extinguishing equipment shown in the illustration is a large __________. Illustration SF-0009
• (A) dry chemical hose reel system
o (B) light water hose reel system
o (C) CO2 hose reel system
o (D) Halon 1301 hose reel system
If choice A is selected set score to 1.
38. In the event of an exhaust duct fire, most dry chemical and carbon dioxide galley range fixed
extinguishing systems are automatically activated through the action of a stainless steel cable,
spring and a __________.
• (A) fusible link
o (B) stack switch
o (C) thermostat
o (D) pyrostat
If choice A is selected set score to 1.
39. Which extinguishing agent is the best for use on electrical fires?
o (A) Water fog
• (B) CO2
o (C) Dry chemical
o (D) Foam
If choice B is selected set score to 1.
40. The longer an oil fire is permitted to burn, the __________.
• (A) harder it is to extinguish
o (B) less chance there is of reignition
o (C) easier it is to extinguish
o (D) easier it is to control
If choice A is selected set score to 1.
8/18/2021 Page 9 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
41. A tank has been sealed and unventilated for a long period of time. Which of the following statements
is true?
o (A) The tank is safe to enter.
• (B) The tank is especially dangerous to enter.
o (C) Carbon monoxide is present.
o (D) Water vapor present when the tank was sealed has oxidized.
If choice B is selected set score to 1.
42. Combustible gas indicators incorporate the use of a/an __________.
o (A) vapor-detecting carbon compound
o (B) sensitive liquid chemical
• (C) Wheatstone bridge
o (D) inflatable bag
If choice C is selected set score to 1.
43. The reading of a combustible gas indicator indicates the percentage of the __________.
o (A) upper explosive limit of a flammable gas concentration
o (B) concentration of flammable gas in a compartment
• (C) lower explosive limit of a flammable gas concentration
o (D) concentration by weight of nonflammable gas in a compartment
If choice C is selected set score to 1.
44. The highest concentration of a harmful substance to which a person may be exposed without danger
to health, is termed the __________.
o (A) odor threshold
• (B) threshold limit value
o (C) vapor pressure
o (D) tolerance point
If choice B is selected set score to 1.
45. When preparing to pump flammable liquids with a centrifugal pump, you should __________.
• (A) check for gland leakage and any fire hazard
o (B) have a standby pump running with the discharge valve closed
o (C) draw a small quantity of liquid to prime the pump
o (D) lift the relief valve by hand to check its operation
If choice A is selected set score to 1.
8/18/2021 Page 10 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
46. When checking the level of a volatile liquid in a tank on the weather deck of a tank vessel, you
should position yourself __________.
• (A) at a right angle to the wind direction
o (B) on the windward side of the opening
o (C) on the leeward side of the opening
o (D) so that the obstruction of your body will protect you from the fumes
If choice A is selected set score to 1.
47. An LNG carrier has an approved type of gas detecting system to detect methane leaks in the
__________.
o (A) boiler burner supply piping
o (B) barrier spaces
o (C) cargo handling rooms
• (D) all of the above
If choice D is selected set score to 1.
48. A high concentration of hydrogen sulfide gas is most likely to be found in which of the locations
listed?
o (A) Fireroom bilges where hydrazine has accumulated.
• (B) Sewage compartment bilges where leaked sewage has accumulated.
o (C) Engine room bilges where chemical cleaners and solvents have accumulated.
o (D) Emergency battery storage compartment where discharge gases have accumulated.
If choice B is selected set score to 1.
49. If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or
adjacent compartments may need to be __________.
o (A) filled with water
o (B) inerted
o (C) gas freed
• (D) all of the above as necessary
If choice D is selected set score to 1.
50. The physical data term on a Safety Data Sheet (SDS) that indicates if the vapor formed by a material
is lighter or heavier than air is called __________.
o (A) vapor level
• (B) vapor density
o (C) vapor gravity
o (D) vapor pressure
If choice B is selected set score to 1.
8/18/2021 Page 11 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
51. Which of the precautions listed should be observed when taking on diesel fuel?
o (A) Secure all lighting to the main deck.
o (B) Provide a portable fan to blow away fumes.
• (C) Prohibit smoking in the area.
o (D) Display a black triangle during daylight hours.
If choice C is selected set score to 1.
52. In cleaning up an oil spill, the use of straw or reclaimed paper fibers would be an example of which
type of oil removal?
o (A) Chemical agent removal
o (B) Mechanical removal
• (C) Absorbent removal
o (D) None of the above
If choice C is selected set score to 1.
53. Your vessel is taking on bunkers from a shoreside facility. If oil begins flowing from one tank vent,
which of the following actions should be taken FIRST?
• (A) Signal the shore control point to shutdown.
o (B) Set out drip pans and sawdust and begin to mop up the spill.
o (C) Close the valve on the tank vent line.
o (D) Open the intake valve to an adjacent tank.
If choice A is selected set score to 1.
54. As its temperature rises, the volume of fuel oil stored in a tank will __________.
o (A) remain the same
• (B) increase
o (C) decrease
o (D) none of the above
If choice B is selected set score to 1.
55. Victual waste is __________.
o (A) the final waste product of a manufacturing process
• (B) any garbage that comes from food or food provisions
o (C) the final discharge of sewage treatment plants
o (D) the resultant sludge that is collected after water washing a boiler
If choice B is selected set score to 1.
8/18/2021 Page 12 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
56. In accordance with 33 CFR Subchapter O (Pollution), each operation involving the transfer of oil or
oily mixture that requires an entry in the Oil Record Book shall be fully recorded __________.
• (A) without delay
o (B) within 12 hours of completion of the operation
o (C) within 24 hours of completion of the project
o (D) within 48 hours of completion of the operation
If choice A is selected set score to 1.
57. In accordance with 33 CFR Subchapter O (Pollution), the Oil Record Book for all U.S. ships
________.
o (A) is to be kept in the personal possession of the master
o (B) should not be used to record the accidental discharge of oil or oily mixtures
• (C) is the property of the U.S. government
o (D) is required to have entries recorded within 48 hours of completion of the particular operation
If choice C is selected set score to 1.
58. The weight of the liquid displaced by a vessel floating in sea water is equal to the __________.
o (A) weight required to sink the vessel
• (B) total weight of the vessel
o (C) reserve buoyancy
o (D) displaced submerged volume
If choice B is selected set score to 1.
59. Static water pressure on the hull of a ship is greatest at the __________.
o (A) bow
o (B) boot topping
• (C) keel
o (D) stern
If choice C is selected set score to 1.
60. The term "oil", as used in the Pollution Prevention Regulations 33 CFR Subchapter O, means
__________.
o (A) crude oil only
o (B) liquefied petroleum gas
• (C) petroleum oil of any kind
o (D) fuel oil only
If choice C is selected set score to 1.
8/18/2021 Page 13 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
61. The Exclusive Economic Zone extends from the baseline of territorial sea of the United States
seaward ___________.
o (A) 53 miles
o (B) 100 miles
• (C) 200 miles
o (D) 300 miles
If choice C is selected set score to 1.
62. In accordance with 33 CFR Subchapter O (Pollution), the definition of graywater includes drainage
from which of the following?
o (A) cargo spaces
o (B) hospital sinks
o (C) toilets
• (D) dishwashers
If choice D is selected set score to 1.
63. A vessel having a concentration of weight toward the top of the vessel is said to be __________.
o (A) neutral
• (B) tender
o (C) buoyant
o (D) stiff
If choice B is selected set score to 1.
64. Many uninspected motor vessels require load lines. For the purpose of the Load Line Regulations,
the term "surveyor" means __________.
o (A) any person from the Coast Guard who is in charge of a marine inspection zone
o (B) an officer of the Coast Guard designated by the commandant to command all Coast Guard
activities within his district
o (C) any person from the Coast Guard who performs duties with respect to the inspection,
enforcement, and administration of Title 52 of the revised statute
• (D) any person designated by the American Bureau of Shipping who actually examines the vessel
If choice D is selected set score to 1.
65. The term "load on top" is the name of a method used on many crude oil carriers for the purpose of
__________.
o (A) calculating the ullage in the cargo tanks
o (B) loading ballast by gravity
• (C) the loading of new cargo into a decanted slop tank as a procedure to minimize pollution
o (D) calculating the ratio of cargo expansion in a cargo tank
If choice C is selected set score to 1.
8/18/2021 Page 14 of 19
Q534 Engineering SafetyQ534 Engineering Safety
U.S.C.G. Merchant Marine Exam
Third Assistant Engineer
Illustrations: 4
66. The important stability parameter "KG" is defined as the __________.
• (A) height of the center of gravity above the keel
o (B) height of the center of buoyancy above the keel
o (C) height of the metacenter above the keel
o (D) metacentric height
If choice A is selected set score to 1.
67. The water in which a vessel floats provides vertical upward support. The point through which this
support is assumed to act is known as the center of __________.
o (A) effort
o (B) gravity
o (C) flotation
• (D) buoyancy
If choice D is selected set score to 1.
68. If a vessel rolls to the starboard side, and there are no movable or moving weights onboard, the
center of gravity will __________.
o (A) move directly down
• (B) stay in the same position
o (C) move to port
o (D) move to starboard
If choice B is selected set score to 1.
69. Excessive free surface occurring in tanks carrying liquid cargo should be avoided in order to
__________.
o (A) maintain hog and sag
o (B) prevent oil pollution
• (C) maintain good stability
o (D) all of the above
If choice C is selected set score to 1.
70. The vertical motion of a floating vessel is known as __________.
o (A) surge
o (B) pitch
• (C) heave
o (D) sway
If choice C is selected set score to 1.
8/18/2021 Page 15 of 19
Q534 Engineering SafetyNational Maritime Center
Serving Our Nation’s Mariners
SF-0004
Adapted for testing purposes only from Marine Fire Prevention, Firefighting and Fire Safety
Maritime Administration
Further reproduction prohibited without permission
10/3/2018 Page 16 of 19
Q534 Engineering SafetyNational Maritime Center
Serving Our Nation’s Mariners
SF-0006
Adapted for testing purposes only from Damage Controlman
NAVEDTRA 14057
10/3/2018 Further reproduction prohibited without permission. Page 17 of 19
Q534 Engineering SafetyNational Maritime Center
Serving Our Nation’s Mariners
SF-0009
Adapted for testing purposes only from Marine Fire Prevention, Firefighting and Fire Safety
U.S. Department of Transportation Maritime Administration
Further reproduction prohibited without permission
10/3/2018 Page 18 of 19
Q534 Engineering SafetyNational Maritime Center
Serving Our Nation’s Mariners
SF-0013
Adapted for testing purposes only from Marine Fire Prevention, Firefighting and Fire Safety
U.S. Department of Transportation Maritime Administration
10/3/2018 Further reproduction prohibited without permission
Page 19 of 19
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