GASCO exit exam

GASCO exit exam questions and answers 1.0

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Gasco exit exam questions and answers are given below as per dg shipping exit exam.

  •  What is the lower flammability limit of butane in % volume hydrocarbon of propane in air :

  1. 9.5
  2. 8.5
  3. 2.2   *
  4. 1.9  

Deep well pump shaft bearing are cooled and lubricated by liquid

  1. Cargo being pumped*
  2. Hydraulic oil
  3. Grease
  4. Inert gas
  • The study of behaviour of matter at low temperature is called
  1. Seismology
  2. Hydrograph
  3. Cryogenics     *
  4. Ecology 
  • Fixed gas detection system alarms should be activated when the vapour concentration reaches
  1. 5   *
  2. 20
  3. 30
  4. 60
  • A device fitted in gas vent pipeline to arrest the passage of flame Into enclosed space
  1. Flame arrestor    *
  2. Explosion proof
  3. Flame screen
  4. Gas free
  • Chemical combination of flammable substance with oxygen is called
  1. Explosion
  2. Auto ignition
  3. Combustion    *
  4. None of the above

  • In an LNG carrier mixture of methane and air are avoided at all time . what is the reason ?
  1. Risk of fire or explosion      *
  2. Degradation of cargo quality
  3. Dilution of cargo
  4. Dilution of cargo
  • Which cargo operation are to be recorded in cargo record book :
  1. All bunker operations
  2. All petroleum cargo operations
  3. All cargo operations involving NLS
  4. All cargo operations    *
  • When cargo carried as liquid in cargo tanks and not shipped in drums , containers , or packages , what are they called as
  1. Liquid cargo
  2. Tank cargo
  3. Oil cargo
  4. Bulk cargo   *
  • Gas ship accommodation and machinery space are :
  1. Hazardous area
  2. Gas safe   *
  3. Gas dangerous
  4. All the above
  • What is the hazards – reactivity when cargo reacts with water called
  1. Hydrate formation    *
  2. Polymerization
  3. Toxic vapour
  4. None of the above
  • Fire fighting technique with a pool fire is to sweep
  1. Side to side
  2. Front to back
  3. Both A and B    *
  4. None of the above
  • The mass of a Vapour compared with the mass of an equal volume of air both at standard condition to temp and pressure is
  1. Relative liquid density
  2. Relative vapour density     *
  3. Relative density
  4. None of the above
  • All account accommodation  ventilation system should be stopped or operated on closed cycle if there is possibility of cargo vapour being drawn into accommodation space
  1. True   *
  2. False
  • What is the liquid relative density at atm. Boiling point for ethylene
  1. 0.57          *
  2. 0.65
  • The term “overall damage” includes both safety hazards and pollution hazard.
  1. True                     *
  2. False
  • Removal of liquid from the cargo tank may cause ______ in inter barrier space pressure and these should be monitored throughout the discharge
  1. Same
  2. Change         *
  3. Leak
  4. None of the above
  • Changing of cargo which may involve
  1. Only gas freeing
  2. Only inerting
  3. Only gassing up
  4. All of the above               *
  • On which type of cargo tank would you find a bimetallic joint or STJ
  1. Kvaerner Moss Type B               *
  2. Gas transport membrane
  3. Type C
  4. Prismatic Type A
  • If the cargo density is different from that specified the float gauge manufacturer what will you adjust
  1. Float correction            *
  2. Trim correction
  3. List correction
  4. Tape correction
  • The frequency of pressure testing ashore of BA set should at least every
  1. 6 years
  2. 5 years          *
  3. 10 years
  4. 15 years
  • What is the guiding rule for limiting pressure surge on loading or discharging
  1. Stop the cargo pump
  2. First close ESD valve nearest to the pump
  3. Finally close other ESD valve
  4. All the above        *
  • The ventilation of the airlock should be of the ______ pressure type
  1. Negative
  2. Positive        *
  3. Neutral
  4. None of the above
  • Why is it necessary to cool down cargo tanks (refrigerated ships) during bulk loading
  1. To avoid overflow
  2. To avoid vapors emission
  3. To avoid vacuum in cargo tank
  4. To avoid excessive tank pressure             *
  • An overdose of toxic petroleum vapour effects your sense of smell by
  1. Reducing it temporarily
  2. Taking it away completely        *
  3. Improving it temporarily
  4. Improving it permanently

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