GASCO - Advanced Training for Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 7

Question 1

What is the use of a Distributed Control System (DCS) onboard an LNG carrier?

Accepted Answer

B: To monitor and control main propulsion and cargo operations

Answer

A: To allow the shore to control the ship's system from the terminal cargo control room

Answer

C: To monitor and control various cargo equipment distributed on the deck

Answer

D: To monitor and control the shore valves from the ship's carao control room

Question 2

Which of the following is not a sign of an LNG gas (vapor) leak into insulation spaces?

Accepted Answer

C: Icing of sea water outside hull when ship at anchor

Answer

A: Comparing to normal trends - high temperature variations on barrier spaces

Answer

B: Increase of pressuree in insulation spaces

Answer

D: Sudden rise in percentage of methane vapour in insulation spaces

Question 3

How is intrinsic safety achieved for electrical circuits used in hazardous areas?

Accepted Answer

A: By limiting the ignition energy and surface temperature that can arise during operation

Answer

B: By increasing mechanical ventilation to the area

Answer

C: By limiting the number of equipment used in a spac

Answer

D: By installing machinery which have higher power and thus shorter operation tim

Question 4

Why is the 'maximum surface temperature' identified, for electrical equipment used in hazardous areas onboard LNG carriers?

Accepted Answer

B: Equipment should operate within these limits to prevent the formation of a hot surfac

Answer

A: The limit is on minimum surface temperature on LNG carriers as the cargo is cryogenic

Answer

C: Equipment should operate within these limits to reduce the power and boil-off consumption

Answer

D: Equipment should operate within these limits to reduce the heat transfer to the cryogenic cargo

Question 5

What can major failure of primary membrane lead to?

Accepted Answer

A: Flooding of primary insulation space by cargo

Answer

B: Increase of temperature in pirmary spaces

Answer

C: Decrease of gas content in the primary space readings

Answer

D: Increase of gas content in secondary spac

Question 6

Based on the principles of segregation, what would you classify electric motor room?

Accepted Answer

C: Gas safe zon

Answer

A: Gas safe zon

Answer

B: Gas dangerous zon

Answer

D: Gas safe spac

Question 7

How will you measure methane concentration inside insulation spaces?

Accepted Answer

A: By using hydrocarbon meter

Answer

B: By using hydrometer

Answer

C: By using personnel oxygen meter

Answer

D: By using tank scop

Question 8

For the LNG NO 96 containment system, why is the cargo tanks secondary insulation spaces pressure maintained slightly higher than primary insulation spaces?

Accepted Answer

A: To avoid vapor transfer into secondary insulation spaces if primary insulation spaces vapor leaks

Answer

B: To avoid cold spot formation in inner hull

Answer

C: To reduce heat transfer and increase efficiency of insulation spaces

Answer

D: To prevent ingress of air through the leak spot into cargo tank

Question 9

How do you remove water from the secondary insulation space?

Accepted Answer

A: By using emergency turbine driven pump fitted in secondary insulation spaces well

Answer

B: By using vacuum pump fitted inside compressor room

Answer

C: By using emergency cargo pump fitted in affected tank emergency cargo pump column

Answer

D: By using emergency hand driven pump fitted in primary insulation spaces well

Question 10

If insulation damage occurs, how does filling the ballast tanks with sea water help in maintaining the hull steel temperature?

Accepted Answer

B: Through better heat transfer, as sea water conducts heat better than air

Answer

A: Through slow heat transfer, as sea water conducts heat better than air

Answer

C: Due to the improved heat transfer to outside sea at ambient temperatur

Answer

D: As sea water temperature is much lower than LNG temperature, thus helping the heat transfer

Question 11

Onboard an LNG tanker with NO 96 containment system, what will happen if a minor membrane leak (crack) occurs above the cargo level?

Accepted Answer

B: Direct vapor flow rate into the insulation spaces via the crack changes with cargo tank's pressure

Answer

A: Small flow of liquid into the crack will vaporize. cargo tank pressuree will remain the same.

Answer

C: Cargo pressuree will be tremendously increased boil-off Gas will be out of control

Answer

D: Leak will become bigger and primary membranee will collapse inwards

Question 12

International Certificate of fitness for Carriage of Liquefied Gas in bulk will not include,

Accepted Answer

D: the carriage condition for minimum certificated crew that must be maintained.

Answer

A: signify that a minimum standard of constructional safety has been incorporated into the ship's build

Answer

B: list the cargo grades that the ship is certified to carry

Answer

C: the carriage condition or minimum tank temperature that must be maintained

Question 13

Which code will you refer to for the requirements on LNG containment system?

Accepted Answer

B: IGC Cod

Answer

A: SIGTTO

Answer

C: IBC Cod

Answer

D: OCIMF

Question 14

Identify the correct statement. LNG carriers are designed and constructed to meet the stringent standards of the,

Accepted Answer

A: International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code).

Answer

B: Design and construction of LNG carrlers are controlled by the classification society rules

Answer

C: Design and construction of LNG carriers are the responsibility of the Government authorities like the US Coastguard

Question 15

What is the ideal location for the cargo tank from the bottom shell plating, for any Gas Tanker type?

Accepted Answer

C: B/ 15 or 2 meters (6.5 feet), whichever isless

Answer

A: B/ 10 or 1.5 meters (4.9 feet), whichever is less

Answer

B: B/5 or 3.0 meters (9.8 feet), whichever is less

Answer

D: B/ 4 or 2.4 meters (7.9 feet), whichever is less

Question 16

As per Chapter 11 of IGC code (fire protection and fire extinction) which of the following is a requirement for an LNG tanker?

Accepted Answer

A: Firemen's outfits

Answer

B: Fire ESD system

Answer

C: Fire emergency response plans

Answer

D: Fire equipment test / drill

Question 17

Onboard an LNG carrier, what provisions are made for separation between the deck and electric motors room?

Accepted Answer

B: Airlocks

Answer

A: Watertight doors

Answer

C: Air intakes

Answer

D: Weathertight doors

Question 18

The poisonous materials first affect the ___________ cells and stop the oxygen flow.

Accepted Answer

B: brain

Answer

A: heart

Answer

C: lung

Question 19

In an LNG carrier mixtures of methane and air are avoided at all times. What is the reason?

Accepted Answer

B: Risk of fire or explosion

Answer

A: Dilution of cargo

Answer

C: Degradation of cargo quality

Answer

D: Ice formation in cargo

Question 20

Which flammability diagram is used to observe change in cargo tank atmosphere for an LNG gas carrier?

Accepted Answer

D: Methane, oxygen and nitrogen mixtures

Answer

A: Methane and nitrogen mixtures

Answer

B: Methane and oxygen mixtures

Answer

C: Methane and air mixtures

Question 21

There are -------- items on the Material Safety Data sheet

Accepted Answer

A: 16 items

Answer

B: 10 items

Answer

C: 15 items

Question 22

What is the required alarm set point for monitoring Insulation spaces?

Accepted Answer

C: 30% by LEL of methan

Answer

A: 5% by volume of methane 5% by LEL of methan

Answer

B: 30% by volume of methan

Question 23

What is the maximum interval of time between sampling and analyzing for each sampling head location sequentially?

Accepted Answer

B: Not exceeding 30 minutes interval

Answer

A: Not exceeding 50 minutes interval

Answer

C: Not exceeding 40 minutes interval

Answer

D: Not exceeding 60 minutes interval

Question 24

The soft,___________ clothes are used for covering the frozen parts of the skin.

Accepted Answer

C: woollen

Answer

A: silk

Answer

B: cotton

Question 25

There are__________ types of flammable limits.

Accepted Answer

A: two

Answer

B: thr

Answer

C: four

Question 26

Certain organs like_____________ may be severely affected with inhalation of cold vapour.

Accepted Answer

B: lungs

Answer

A: liver

Answer

C: kidneys

Question 27

How can a gas be liquefied?

Accepted Answer

B: By the application of pressuree or by cooling

Answer

A: By mixing gases of higher specific density

Answer

C: By fusion in a closed chamber

Answer

D: By evaporation in a closed chamber

Question 28

___________of a substance can be defined as the pressure exerted by a saturated vapour at a specific temperature.

Accepted Answer

A: Saturated vapour pressure

Answer

B: Saturated latent heat

Answer

C: Saturated vapour density

Question 29

What is the IGC code definition for a liquefied gas?

Accepted Answer

A: Product having a saturated vapor pressuree of 2.8 bar absolute at 37.8°C/100°F

Answer

B: Product having a saturated vapor pressuree of 1.76 bar absolute at 37.8°C/ 100 ° F

Answer

C: Product having a saturated vapor pressuree of 1.76 bar absolute at 38.7°C/1029 F

Answer

D: Product having a saturated vapor pressuree of 2.8 bar absolute at 38.7°C/102° F

Question 30

During heat transfer from one body to another, what transfer takes place?

Accepted Answer

B: Energy

Answer

A: Molecul

Answer

C: Power

Answer

D: Electron

Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) (Set 7)

What is the use of a Distributed Control System (DCS) onboard an LNG carrier?

Questions in GASCO Set 7

Question Discussion & Notes

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