200-Ton Master Safety Practice Questions

Sample questions — Safety

Drawn from the same bank used on USCG licensing exams. Correct answers and explanations are shown — read every explanation, even for questions you get right.

1. 1. A Class A fire involves which type of combustible material?

   • A.Ordinary combustibles such as wood, paper, and cloth✓
   • B.Flammable liquids such as gasoline and oil
   • C.Energized electrical equipment
   • D.Combustible metals such as magnesium and titanium

   Why: Class A fires involve ordinary combustible materials such as wood, paper, cloth, and rubber. These fires leave ash after burning, which is the basis for the letter 'A' designation.

2. 2. Why is the production of new Halon 1301 and Halon 1211 fire extinguishing agents prohibited?

   • A.They are ineffective against modern synthetic fuel fires
   • B.They are ozone-depleting substances banned under the Montreal Protocol✓
   • C.They produce toxic decomposition products at all temperatures
   • D.They are classified as explosive materials under CFR Title 49

   Why: Halon 1301 and 1211 are ozone-depleting substances regulated under the Montreal Protocol of 1987. New production was banned in developed countries as of January 1, 1994; existing supplies may still be used but cannot be replenished from new production.

3. 3. When using a dry chemical extinguisher on a Class B flammable liquid fire, what technique should be employed to avoid spreading the burning fuel?

   • A.Aim the discharge directly at the base of the flames from the upwind side, sweeping side to side✓
   • B.Discharge from as far away as possible in a straight stream aimed at the center of the fire
   • C.Apply the dry chemical in a circular pattern starting from the outside edge and moving inward
   • D.Stand directly downwind and discharge the agent overhead to allow it to fall onto the fire

   Why: For Class B liquid fires, the extinguisher should be aimed at the base of the flames from the upwind side and swept from side to side to knock down the flames without scattering burning fuel. Attacking from upwind protects the operator from heat and prevents burning liquid from being blown back.

4. 4. How often must an inflatable life raft be serviced at an approved service facility?

   • A.Every 12 months✓
   • B.Every 24 months
   • C.Every 36 months
   • D.Every 5 years

   Why: Per 46 CFR 160.151, inflatable life rafts must be serviced at an approved facility at intervals not exceeding 12 months. This ensures the raft's inflation system, equipment pack, and container integrity remain in serviceable condition.

5. 5. Under GMDSS, vessels in Sea Area A1 must maintain a continuous watch on DSC Channel 70. This watch is typically maintained by:

   • A.A licensed radio officer stationed at the radio room at all times
   • B.Automatic scanning receiver with DSC capability integrated into the VHF radio✓
   • C.A dedicated satellite terminal set to Channel 70 polling
   • D.The helmsman monitoring the VHF radio continuously

   Why: GMDSS eliminated the dedicated radio officer requirement by mandating automatic DSC watchkeeping via a scanning DSC receiver integrated into the VHF radio, which monitors Channel 70 continuously without requiring a dedicated human watch.

6. 6. If an inflatable life raft inflates in the capsized (upside-down) position, you should right it by:

   • A.Waiting for wave action to right the raft naturally
   • B.Standing on the CO2 cylinder side and pulling the righting strap upwind✓
   • C.Deflating one tube to reduce resistance and then rolling the raft
   • D.Swimming underneath and pushing up from the center

   Why: To right a capsized life raft, a survivor stands on the CO2 cylinder (which is positioned on the bottom when inverted), grasps the righting strap on the underside, and leans back while pulling, positioning themselves upwind so the raft falls away and does not land on top of them.

7. 7. When a DSC (Digital Selective Calling) distress alert is transmitted on VHF Channel 70, on which channel should the distress traffic then be conducted?

   • A.Channel 70
   • B.Channel 16✓
   • C.Channel 22A
   • D.Channel 6

   Why: DSC distress alerts are sent on Channel 70, which is reserved exclusively for digital distress alerting. The actual voice distress communication (MAYDAY call and subsequent traffic) is then conducted on Channel 16 per ITU and FCC regulations.

8. 8. During an active MAYDAY situation, which transmission can legally impose radio silence on all other stations?

   • A.Any vessel transmitting SECURITE
   • B.The Coast Guard or the station controlling distress traffic transmitting SEELONCE MAYDAY✓
   • C.Only the FCC can impose radio silence via a formal regulatory order
   • D.Any vessel transmitting PAN PAN for a medical emergency

   Why: The phrase 'SEELONCE MAYDAY' (phonetic for 'silence MAYDAY') transmitted by the Coast Guard or the station controlling distress communications imposes strict radio silence on all stations that might interfere with the distress traffic, per ITU Radio Regulations.

9. 9. A mariner transmits a false MAYDAY to test whether the Coast Guard will respond quickly. What are the potential legal consequences under U.S. law?

   • A.A warning letter from the FCC with a 30-day probationary period
   • B.Civil penalties up to $10,000 and/or criminal penalties including fines up to $250,000 and imprisonment under 14 U.S.C. § 521 and 47 U.S.C. § 325✓
   • C.Loss of radio operator's permit for 90 days per FCC regulations
   • D.No penalty if the person confesses before a rescue unit is actually deployed

   Why: Under 14 U.S.C. § 521, knowingly and willfully communicating a false distress signal is a federal crime. Penalties can include civil fines up to $10,000 per violation and criminal prosecution with fines up to $250,000 and imprisonment, reflecting the serious risk to SAR personnel caused by false alarms.

10. 10. Which EPIRB signal or device is specifically designed to mark a man overboard position for SAR personnel?

    • A.Class B EPIRB
    • B.SART (Search and Rescue Transponder)
    • C.AIS-MOB personal locating device✓
    • D.NAVTEX receiver

    Why: An AIS-MOB (Man Overboard) device, when activated, transmits an AIS distress signal with GPS position to all nearby AIS-equipped vessels, providing real-time tracking of the person in the water. SARTs are designed for liferaft detection by radar, not MOB marking.

11. 11. Under 46 U.S.C. § 2303, a vessel operator involved in a collision with another vessel must:

    • A.Proceed directly to the nearest port and file a report within 24 hours
    • B.Render assistance to the other vessel and persons in danger without serious danger to own vessel✓
    • C.Immediately anchor and await Coast Guard investigation
    • D.Only render assistance if the other vessel displays a distress signal

    Why: 46 U.S.C. § 2303 (Duties related to marine casualty assistance and information) legally requires a vessel operator involved in a collision to render assistance to other vessels and persons in danger, provided this does not seriously endanger the operator's own vessel, crew, or passengers.

12. 12. In cold water survival, the HELP position (Heat Escape Lessening Posture) is used to:

    • A.Signal rescuers by making the body more visible from the air
    • B.Conserve body heat by protecting high heat-loss areas of the body✓
    • C.Keep the airway above water by arching the back and extending the neck
    • D.Prevent exhaustion by allowing the person to float without treading water

    Why: The HELP position involves drawing the knees to the chest, pressing the arms against the sides, and keeping the groin and armpit areas protected. This conserves body heat by reducing exposure of the high-loss areas (groin, armpits, neck, head) and can extend survival time in cold water by 50% or more.

13. 13. Sea Area A4 covers:

    • A.Harbors and rivers
    • B.The polar regions outside Inmarsat coverage (above ~70° latitude)✓
    • C.Within 20 nm of shore
    • D.The Inmarsat footprint

    Why: Sea Area A4 is the polar regions (roughly above 70°N and below 70°S) outside Inmarsat geostationary coverage; HF communications are required there.

14. 14. Continuous monitoring for VHF DSC alerts is maintained on:

    • A.Channel 13
    • B.518 kHz
    • C.Channel 16 by ear
    • D.Channel 70 by the DSC controller✓

    Why: The DSC controller keeps a continuous automatic watch on Channel 70 for distress, urgency, safety and routine calls, freeing the operator from a manual aural watch.

15. 15. A first-aider should treat a suspected limb fracture by:

    • A.Immobilizing it with a splint in the position found✓
    • B.Having the victim walk on it
    • C.Massaging the area
    • D.Straightening the limb forcefully

    Why: Immobilize a suspected fracture with a splint in the position found, padding for comfort, and check circulation beyond the injury; do not try to realign the bone.

16. 16. To cover a large area with an uncertain survivor position, usually with several units, you would use a:

    • A.Williamson turn
    • B.Sector search
    • C.Parallel track (sweep) search✓
    • D.Expanding square

    Why: Parallel track (sweep) searches cover large areas with evenly spaced parallel legs, well suited to multiple search units and a less certain datum.

17. 17. A fire involving flammable liquids such as gasoline, oil, or grease is what class of fire?

    • A.Class A
    • B.Class B✓
    • C.Class C
    • D.Class D

    Why: Class B fires involve flammable liquids and gases. Class A is ordinary combustibles (wood, paper); Class C is energized electrical equipment; Class D is combustible metals. The fuel determines the class and the correct extinguishing agent.

18. 18. The function of a hydrostatic release unit on a liferaft cradle is to:

    • A.Keep the raft from inflating accidentally in port
    • B.Charge the raft's CO2 bottle
    • C.Sound the abandon-ship alarm
    • D.Automatically release the raft at depth if the vessel sinks before it can be launched✓

    Why: If a vessel founders too quickly to launch the raft manually, water pressure at a few meters' depth trips the hydrostatic release, freeing the raft to float clear; the painter then inflates it. It is a fail-safe, not a substitute for manual launching when there is time.

19. 19. A continuous sounding of any fog-signal apparatus is recognized as:

    • A.A distress signal✓
    • B.A signal to alter course to starboard
    • C.An anchored-vessel signal
    • D.A request for a pilot

    Why: Annex IV lists the recognized distress signals; a continuous sounding of any fog-signalling apparatus is one of them. Others include flames on the vessel, red flares/rockets, an orange smoke signal, the SOS Morse signal, and the square-flag-and-ball shape.

20. 20. Pyrotechnic distress flares carried in survival craft should be:

    • A.Fired only in daylight
    • B.Pointed at the nearest vessel
    • C.Used sparingly and only when there is a realistic chance they will be seen✓
    • D.Discharged all at once on abandoning ship

    Why: Flares are a limited resource; fire them when a ship or aircraft is likely in sight so they are not wasted. Hold them downwind, point them away from people and the raft, and follow the day/night types correctly (smoke for day, red star/parachute for night).

Frequently asked questions

Is Safety on the 200-Ton Master exam?

Yes — Safety is one of the tested modules on the 200-Ton Master licensing exam. Candidates must score 70% on each module to pass.

How many Safety questions are on the 200-Ton Master exam?

The USCG draws from a bank of 191 Safety questions across all exams. The exact number on any single sitting varies, but Rules of the Road is typically the largest module and has the highest passing threshold (90%).

What is the best way to study Safety for the 200-Ton Master exam?

Work through the practice questions in this bank until you can answer them consistently above the passing threshold. Review every explanation — understanding why the wrong answers are wrong matters more than memorizing facts.