GASCO exit exam questions and answers 3.0

• The purpose of remotely controlled measuring of tank levels are to measure

1. Height from liquid surface to top stringers in the tank
2. Height of the liquid in the tank          *
3. Height from bottom shell to top stringers in the tank
4. Height of bottom girders in the tank

• One of the following is NOT an alarm on an inert gas plant, which one?

1. Low pressure alarm
2. Low oxygen Alarm            *
3. Deck sea Low water Alarm
4. Scrubber high water level alarm

• While commencement of loading Cargo direct high pressure loading is advisable

1. True
2. False               *

• On all gas ships, any pipework entering or leaving the cargo tank must do so through the ____ of the tank

1. Aft end
2. Top       *
3. Bottom
4. Forward end

• If a centrifugal pump operating with a positive suction head becomes air bound, your FIRST response should be to _____

1. Vent the casting       *
2. Tighten the packing
3. Close the discharge
4. Re-prime the pump

• How much cleaner is natural gas to burn?

1. Reducing Carbon Dioxide (CO2) emissions by 20% to 30%                *
2. Reducing carbon monoxide (CO) emissions up to 75%
3. Reducing nitrous oxide (NO2) emission by appropriately 50%
4. All the above

• Self contained breathing apparatus – SCBA is also called as

1. Compressed air breathing apparatus – CABA             *
2. EEBD
3. ELSA
4. None of the above

• The space enclosed by the ships structure in which a cargo Containment system is situated called ______

1. Hold space            *
2. Compressor room
3. Motor room
4. Engine room

• This liquefied gas is normally carried in its fully refrigerated condition at its atmospheric boiling point of -104 degree C is ______

1. Ethylene             *
2. Propane
3. Butane
4. Ammonia

• How is cooling/Cleaning water supplied to the inert gas scrubber tower?

1. By the main sea water pumps
2. By the cargo condenser pump
3. By the scrubber sea water pump              *
4. By the deck seal sea water pump

• Which safety device is fitted on the deck inert gas line to monitor the supply condition of the inert gas?

1. The inert gas high temperature alarm
2. The inert gas low flow alarm
3. The inert gas low pressure alarm                      *
4. The inert gas reverse flow alarm

• Tank relief V/V used for release of excessive pressure

1. True       *
2. False

• What characteristics should insulation materials possess for use in gas carriers?

1. Low thermal conductivity, ability to bear loads
2. Ability to with stand mechanical damage, lightweight
3. Unaffected by cargo liquid or vapour
4. All the above       *

• Which of the following is the ultimate source of energy for us?

1. LNG
2. Nuclear
3. Solar   *
4. CNG

• Why strainers are commonly installed in the cargo piping system?

1. To protect the cargo handling plant
2. To protect equipment from damage by foreign objects
3. Both A and B              *
4. None of the above

• 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 inert gas as it is produced by the boilers or inert gas generator?

1. Free of oxygen and clean               *
2. Hot and containing soot particles
3. Dirty and saturated
4. Super heated and black or greyish in colour

• For what reason cargo sampling is necessary in gas tanker?

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 danger 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 water
2. Freezing of the water side of the heater           *
3. Over pressurizing of the water side of the heater
4. Overheating of the gas side of the heater

• Magnesium, Titanium, Sodium, Lithium and Potassium are classified as

1. Class A fire
2. Class B fire
3. Class C fire
4. Class D fire            *

• What are the symptoms of Asphyxiant , when LPG and LNG carried as cargo?

1. Increased rate and dept of respiration and loss of consciousness
2. Blueness of the skin (Cyanosis)
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 sea water pumps or through the condenser cargo pump
2. Through a sea water 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 valve types is most commonly used in conjunction with hydraulically actuated controls?

1. Non return valves
2. Globe valves
3. Butterfly valves           *
4. Gate valves

• What is 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 pipe line is the _____

1. Globe valve                           *
2. Gate valve
3. Check valve
4. Pug 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

• Which tanks are completely supported 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 forms explosive compounds with

1. Mercury alone
2. Mercury, chlorine, iodine, bromine, calcium, silver oxide and silver hypo chlorite                *
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 the above

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