• What are the symptoms of Asphyxiant, when LPG and LNG carried as cargo ?
  1. Increase rate and depth of respiration and loss consciousness
  2. Blueness of the skin
  3. Stertorous breathing with a snoring sound
  4. All of the above                 *
  • Inert gas – how is sea water supplied to the deck seal ?
  1. Through the main seawater pumps or through the condenser cargo pump
  2. Through a seawater aggregate pump fitted on the cargo deck
  3. Through the deck fire line
  4. Through the deck seal pump fitted in the engine room                             *
  • On tank vessels which of these valves types is most commonly used in conjunction with hydraulically actuated control ?
  1. Non return valves
  2. Globe valves
  3. Butterfly valves                 *
  4. Gate valves
  • What is the critical temperature of methane in degree Celsius ?
  1. -82.5                        *
  2. 82.5
  3. 52.8
  4. None of the above
  • On tank vessels equipped with the power operated cargo tank valves, the type of power operator most commonly used is ___________
  1. Hydraulic                  *
  2. Electric
  3. Steam
  4. Diesel
  • The valve best suited for throttling gas or liquid flow in a pipeline is the
  1. Globe valve                            *
  2. Gate valve
  3. Check valve
  4. Plug cock
  • What is the boiling point at atmospheric pressure of ammonia ?
  1. -42 degree Celsius
  2. -34 degree Celsius                       *
  3. -5 degree Celsius
  4. None of the above
  • What tanks are self supporting and do not form part of the ship’s hull structure ?
  1. Independent tanks                      *
  2. Membrane tank
  3. Semi membrane tank
  4. None of the above
  • Ammonia form explosive compounds with
  1. Mercury alone
  2. Mercury, chlorine, iodine, bromine, calcium, silver oxide & silver hypochlorite                      *
  3. Silica
  4. Water
  • A bigger spell of LPG will be visible as a ________ which is condensed water vapour from the atmosphere
  1. White cloud                  *
  2. Blue cloud
  3. Black cloud
  4. None of these
  • How is BOILOFF gas generated
  1. Evaporation
  2. Heat ingress
  3. Drop in pressure
  4. All of the above                             *
  • What are the necessary condition that must take place for an electrical discharge  to occur
  1. Electrostatic separation
  2. Electrostatic accumulation                      *
  3. Electrostatic discharge
  4. All of the above
  • Gas ships cargo compressor room, cargo tank area are
  1. Snap back area
  2. Gas free area
  3. Gas dangerous                  *
  4. All of the above
  • On board LNG tanker which of these equipment is not required for gas burning
  1. Vacuum pump                        *
  2. Gas heater
  3. Compressor
  4. Steam dump on main condenser
  • Which of these would you consider essential equipment to carry when working on the deck of ship carrying ammonia ?
  1. Gloves
  2. Personal O2 meter
  3. Gas mask                           *
  4. Personal hydrocarbon alarm
  • What is the condition of the inert gas as it is produced by the boilers or inert gas generator ?
  1. Free of oxygen and clean                                                   *
  2. Hot and containing shoot particles
  3. Dirty and saturated
  4. Superheated and black or greyish on colour
  • For what reason cargo sampling is necessary in as tankers ?
  1. To establish safe conditions prior to cargo transfer
  2. To establish that the cargo is within commercially agreed specifications at various pumps
  3. Both A and B                                 *
  4. None of the above
  • What is the main dander to be guarded against when discharging using a cargo heater with sea water as the heating medium ?
  1. Over pressurizing of the gas side of the heater
  2. Freezing of water side of the heater                         *
  3. Over pressurizing of the water side of the heater
  4. Overheating of the gas side of the heater
  • If cargo density is different from that specified by the float gauge manufacturer what will you adjust
  1. Float correction                       *
  2. Trim correction
  3. Tape correction
  4. List correction
  • What is the guiding rule for limiting pressure surge during loading or discharging
  1. Stop the cargo pump
  2. First close the ESD valve nearest to the pump
  3. Finally close the ESD valve
  4. All of the above                    *


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