GASCO exit exam questions and answers 2.0

• All liquefied gases producesvapours which have a relative vapour density greater than that of

1. Methane     *
2. Methane and ethylene
3. Methane, ethylene and ammonia
4. None of the above

• Gas codes and classification society rules require every tank to be fitted at least _____ level gauge

1. One
2. Two          *
3. Three
4. Four

• The concentration of a hydrocarbon gas is air below which there is insufficient hydrocarbon is called

1. Lower flammable limit              *
2. Dry air
3. Upper flammable limit
4. Stoichiometric ratio

• After stopping the cargo compressor, the glycol/water system is left running to provide

1. Crank case heating
2. Remove cargo vapours
3. Both a and b
4. None of the above         *

• Fixed water spray system for fire protection purpose in gas tanker covers area such as

1. Cargo tanks domes only
2. The front of the accommodation and control room bulkhead
3. Cargo tank area above deck and cargo manifold area
4. All the above            *

• When carbon atoms joined by double covalent bonds C-C or triple covalent bonds, what is it called as

1. Saturated organic compound
2. Unsaturated organic compound          *
3. Both a and b
4. None of the above

• What is liquid relative density at Atm boiling point of methane

1. 0.427         *
2. 144
3. 195.7
4. None of the above

1. The ability of a substance to cause damage to living tissue or impairment of the central nervous system

1. Asphyxia
2. Frost bite
3. Toxicity    *
4. None of the above

1. How suction capacity and resulting discharge rate can be regulated

1. By reducing pump speed
2. By throttling the discharge valve
3. By creating bypass (return flow)
4. All the above     *

1. 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 the above    *

1. Gas ships cargo compressor room, cargo tank area are

1. Snap back area
2. Gas safe area         *
3. Gas dangerous
4. All the above

1. What does Exe represents

1. Flameproof       *
2. Pressurized
3. Increased safety
4. None of the above

1. Onboard LNG tanker which of these requirements is not required for gas burning

1. Vacuum pump               *
2. Gas heater
3. LD compressor
4. Steam dump on main condenser

1. What is provided in a low duty gas compressor to prevent lubricating oil mist from entering the compressed LNG vapour ?

1. The gas detection system
2. The gas burning system
3. The lubricating system
4. The seal gas system                *

1. Identify the solution used in the container for a soda acid type water extinguisher

1. Sodium sulphate
2. Sodium bicarbonate  *
3. Sodium nitrate

1. What is the first task to be completed before doing hot work permit.

1. To inform chief engineer
2. Work can be started without carrying out any other task
3. To complete a hot work permit        *
4. None of the above

1. The most like place for the spontaneous combustion that take place is

1. The oily rag bin      *
2. The fuel oil tanks
3. The electrical switch boards
4. The pressure tanks

• Which of the following is not part of an arrangement in fiber optical system to accommodate ‘fail safe’ ESDS system

1. The photo coupler of the input side are duplicated
2. Frequency checking sides of O/P are duplicated
3. The optical cables are protected by double layer of insulations           *
4. The output circuits has double output contacts

• Up to what temperature is methane vapour heavier than air

1. -110C    *
2. -161 .5C
3. -125C
4. 15C

• What is the typical content of carbon dioxide in inert gas produced by an inert gas generator

1. 25%
2. 15%    *
3. 20%
4. 30%

• A water repellant such as _____ is added in order to avoid humidity in the power

1. Sulphur
2. Silicon     *
3. Calcium
4. None of the above

• In case of heating the mercury column containing the test liquid, the level of mercury will

1. Remain the same
2. Decreases
3. Increase     *

• What does the term boil off mean

1. Cargo vapour space in insulation space
2. Natural vapourization of LNG in the cargo tank     *
3. Cargo tank vapour pressure during voyage
4. Excess steam dumped from the boiler

• Why LNG is liquefied for sea transportation

1. LNG has high calorific value than natural gas
2. Natural gas transportation by sea is banned
3. It makes it more economical to transport      *
4. 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 ?

1. R 404
2. Carbon dioxide
3. Nitrogen             *
4. Argon

GASCO EXIT EXAM 4.0

• GASCO EXIT EXAM 3.0

• GASCO EXIT EXAM 1.0