- All liquefied gases producesvapours which have a relative vapour density greater than that of
- Methane *
- Methane and ethylene
- Methane, ethylene and ammonia
- None of the above
- Gas codes and classification society rules require every tank to be fitted at least _____ level gauge
- One
- Two *
- Three
- Four
- The concentration of a hydrocarbon gas is air below which there is insufficient hydrocarbon is called
- Lower flammable limit *
- Dry air
- Upper flammable limit
- Stoichiometric ratio
- After stopping the cargo compressor, the glycol/water system is left running to provide
- Crank case heating
- Remove cargo vapours
- Both a and b
- None of the above *
- Fixed water spray system for fire protection purpose in gas tanker covers area such as
- Cargo tanks domes only
- The front of the accommodation and control room bulkhead
- Cargo tank area above deck and cargo manifold area
- All the above *
- When carbon atoms joined by double covalent bonds C-C or triple covalent bonds, what is it called as
- Saturated organic compound
- Unsaturated organic compound *
- Both a and b
- None of the above
- What is liquid relative density at Atm boiling point of methane
- 0.427 *
- 144
- 195.7
- None of the above
- The ability of a substance to cause damage to living tissue or impairment of the central nervous system
- Asphyxia
- Frost bite
- Toxicity *
- None of the above
- How suction capacity and resulting discharge rate can be regulated
- By reducing pump speed
- By throttling the discharge valve
- By creating bypass (return flow)
- All the above *
- What are the necessary condition that must take place for an electrical discharge to occur
- Electrostatic separation
- Electrostatic accumulation
- Electrostatic discharge
- All the above *
- Gas ships cargo compressor room, cargo tank area are
- Snap back area
- Gas safe area *
- Gas dangerous
- All the above
- What does Exe represents
- Flameproof *
- Pressurized
- Increased safety
- None of the above
- Onboard LNG tanker which of these requirements is not required for gas burning
- Vacuum pump *
- Gas heater
- LD compressor
- Steam dump on main condenser
- What is provided in a low duty gas compressor to prevent lubricating oil mist from entering the compressed LNG vapour ?
- The gas detection system
- The gas burning system
- The lubricating system
- The seal gas system *
- Identify the solution used in the container for a soda acid type water extinguisher
- Sodium sulphate
- Sodium bicarbonate *
- Sodium nitrate
- What is the first task to be completed before doing hot work permit.
- To inform chief engineer
- Work can be started without carrying out any other task
- To complete a hot work permit *
- None of the above
- The most like place for the spontaneous combustion that take place is
- The oily rag bin *
- The fuel oil tanks
- The electrical switch boards
- The pressure tanks
- Which of the following is not part of an arrangement in fiber optical system to accommodate ‘fail safe’ ESDS system
- The photo coupler of the input side are duplicated
- Frequency checking sides of O/P are duplicated
- The optical cables are protected by double layer of insulations *
- The output circuits has double output contacts
- Up to what temperature is methane vapour heavier than air
- -110C *
- -161 .5C
- -125C
- 15C
- What is the typical content of carbon dioxide in inert gas produced by an inert gas generator
- 25%
- 15% *
- 20%
- 30%
- A water repellant such as _____ is added in order to avoid humidity in the power
- Sulphur
- Silicon *
- Calcium
- None of the above
- In case of heating the mercury column containing the test liquid, the level of mercury will
- Remain the same
- Decreases
- Increase *
- What does the term boil off mean
- Cargo vapour space in insulation space
- Natural vapourization of LNG in the cargo tank *
- Cargo tank vapour pressure during voyage
- Excess steam dumped from the boiler
- Why LNG is liquefied for sea transportation
- LNG has high calorific value than natural gas
- Natural gas transportation by sea is banned
- It makes it more economical to transport *
- The ship can choose the form of neutral gas or LNG to be loaded
- Which of the following is the typical seal gas system used for low duty gas compressor ?
- R 404
- Carbon dioxide
- Nitrogen *
- Argon
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