Safety – MEO CLASS 4 WRITTEN PAPER

41. Which of the following statements is true?
    1. The installation of an IMO approved incinerator is mandatory on all ships.
    2. The installation of an incinerator is mandatory on all ships above 400 GRT.
    3. The installation of an incinerator is not a mandatory requirement.
    4. The installation of incinerators is mandatory only for dry ships

ANS.: A

42. The purpose of inert gas systems onboard tank vessels is to __________.
    1. allow sufficient oxygen in the tank to sustain life
    2. prevent outside air from entering the tank
    3. provide increase in cargo discharge pressure
    4. comply with double hull pollution prevention regulations

ANS.: B

43. In reference to accidental oil pollution, the most critical time during bunkering is when ________
    1. you first start to receive fuel
    2. hoses are being blown down
    3. final topping off is occurring
    4. hoses are being disconnected

ANS.: C

44. An inert gas system installed on a tanker is designed to __________.
    1. aid in the stripping and cleaning of cargo tanks
    2. increase the rate of discharge of cargo
    3. force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere
    4. lower the oxygen levels inside cargo tanks, making explosion nearly impossible

ANS.: D

45. Your ship is sinking rapidly. A container containing an inflatable liferaft has bobbed to the surface upon functioning of the hydrostatic release. Which action should you take?
    1. Cut the painter line so it will not pull the liferaft container down.
    2. Swim away from the container so you will not be in danger as it goes down.
    3. Take no action because the painter will cause the liferaft to inflate and open the container.
    4. Manually open the container and inflate the liferaft with the hand pump.

ANS.: C

46. The atmosphere in a tank is too lean if it is __________.
    1. incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)
    2. capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)
    3. capable of supporting a fire once started
    4. not safe for ballasting

ANS.: A

47. Inflatable liferafts are less manoeuverable than lifeboats due to their __________.

1. shape
2. shallow draft
3. large sail area
4. All of the above

ANS.: D

48. What is the generally accepted method of determining whether the atmosphere within a cargo tank is explosive, too rich, or too lean to support combustion?
    1. Use the open flame test on a small sample that has been taken from the tank.
    2. Send a gas sample ashore for laboratory analysis.
    3. Enter the tank with an oxygen analyzer.
    4. Use an explosimeter

ANS.: D

49. Before using a fixed CO2 system to fight an engine room fire, you must __________.
    1. secure the engine room ventilation
    2. secure the machinery in the engine room
    3. evacuate all engine room personnel
    4. All of the above

ANS.: D

50. You are fighting a fire in the electrical switchboard in the engine room. You should secure the power, then__________.
    1. use a portable foam extinguisher
    2. use a low-velocity fog adapter with the fire hose
    3. use a portable CO2 extinguisher
    4. determine the cause of the fire

ANS.: C

51. The minimum concentration of a vapor in air which can form an explosive mixture is called the__________.

1. auto-ignition point
2. flash point
3. lower explosive limit (LEL)
4. threshold limit value (TLV)

ANS.: C

52. The deck water seal of the inert gas system __________.
    1. cools the inert gas and prevents soot from entering the cargo tanks
    2. acts as an emergency system shutdown when the inlet pressures exceed the safe working pressure in the hazardous zone
    3. prevents the backflow of hydrocarbon gasses into nonhazardous areas
    4. relieves sudden large overpressures in the system

ANS.: C

53. The explosive range of petroleum vapors mixed with air is __________.
    1. 0% to 1%
    2. 1% to 10%
    3. 10% to 15%
    4. 12% to 20%

ANS.: B

54. Fuel oil tank vents are fitted with a screen which will stop __________.
    1. oil from flowing out of the tank vent
    2. air from entering the tank vent
    3. vapors from leaving the tank vent
    4. flames on deck from entering the tank vent

ANS.: D

55. Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?
    1. Signaling that all personnel are clear before lifting or lowering material.
    2. Examining material for sharp edges or protruding points before handling.
    3. Closing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipment.
    4. Throwing materials from high places to the deck

ANS.: D

56. Which of the following statements is true?
    1. Ballast water exchange at mid ocean eliminates completely the risks associated with introduction of non-native organisms and pathogens in alien habitats.
    2. In the flow through method, the water pumped through a tank should be at least 3 times the tank volume.
    3. Over pressurization of a tank cannot take place during the flow through method.
    4. Air pipes on ballast tanks are designed for continuous overflow.

ANS.: B

57. The most common cause of engine room fires is:
    1. Spontaneous combustion of oily rags
    2. Back fire of boilers
    3. Ignition sources coming in contact with stored fuel /lubes
    4. Oil leakage coming in contact with hot exposed surfaces

ANS.:  D

58. A fuel tank on a barge has been certified by a marine chemist as being “Safe for Men” and “Safe for fire”. This condition may change if:
    1. the ambient temperature changes
    2. a product leaks into the certified tank
    3. muck, sludge, or scale in the tank give off additional vapors
    4. all of the above

ANS.: D

59. As per MARPOL annex-1, the instantaneous rate of discharge of oil content means:
    1. The rate of discharge of oil-water mixture in litres per hour at any instant divided by the speed of the ship in knots at the same instant
    2. The rate of discharge of oil in litres per hour at any instant divided by the speed of the ship in knots at the same instant
    3. The average rate of discharge of oil-water mixture in litres per hour divided by the average speed of the ship in knots
    4. The average rate of discharge of oil mixture in litres per hour divided by the average speed of the ship in knots

ANS.: B

60. Which of the following statements about LRIT is False?
    1. Regulation on LRIT is included in Chapter V of SOLAS
    2. LRIT has longer range than AIS
    3. LRIT, like AIS, is a broadcast system that transmits information about ship’s identity, location date and time of position to all in range
    4. LRIT and AIS should not have any interface

ANS.: C