GASCO - Advanced Training for Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 10

Question 1

Which of these is not a possibility if by accident the insulation spaces are over pressurized?

Accepted Answer

D: Tripping of cargo pump

Answer

A: Membrane collaps

Answer

B: Lifting of insulation safety valves

Answer

C: Initiation of emergency shut down

Question 2

Fire-fighting measures shown in MSDS will not include,

Accepted Answer

C: Training requirement for firefighting and Special protective equipment

Answer

A: Suitable (and unsuitable) extinguishing media

Answer

B: Specific hazards arising from the chemical (e.g., nature of any hazardous combustion products)

Answer

D: Special protective equipment and precautions for fire-fighters

Question 3

If icing is not very effective, the next method to be followed is around the injured area.

Accepted Answer

A: compressing

Answer

B: resting

Answer

C: massaging

Question 4

In ABC method, A stands for

Accepted Answer

B: Air

Answer

A: Anesthesia

Answer

C: Acut

Question 5

What should be the typical content of oxygen in inert gas produced by an inert gas generator onboard an LNG carrier?

Accepted Answer

A: 0.5%

Answer

B: 12.6%

Answer

C: 7.5%

Answer

D: 13%

Question 6

Some of the examples of___________ are methane, ethane, propane and butane.

Accepted Answer

A: saturated hydrocarbons

Answer

B: unsaturated hydrocarbons

Answer

C: saturated fatty acids

Question 7

If an LNG sale document is marked as Free on Board (FOB), after discharge who is the owner of the "heel' retained onboard?

Accepted Answer

C: Buyer owns the heel and may keep it onboard as he controls vessel 6

Answer

A: Seller owns the heel and may keep it onboard as he controls the vessel

Answer

B: Seller owns the heel and may heel out

Answer

D: Seller owns the heel and may keep It to mix with the next cargo

Question 8

What is the temperature at which gas saturates and the water vapor present begins to condense?

Accepted Answer

D: Dew point

Answer

A: Boiling point

Answer

B: Condensate point

Answer

C: Vapor point

Question 9

Identify the correct name for a gas or mixture of gases, containing insufficient oxygen to initiate and support combustion where oxygen content is not greater than 5% by volume.

Accepted Answer

A: Inert gas

Answer

B: Cold gas

Answer

C: Anti - fire gas

Answer

D: Anti - oxygen gas

Question 10

What is the designed boil-off rate for a typical membrane type LNG carrier?

Accepted Answer

A: 0.15% of full cargo tank capacity / day

Answer

B: 0.05% of full cargo tank capacity / day

Answer

C: 0.25% of full cargo tank capacity / day

Answer

D: 0.5% of full cargo tank capacity / day

Question 11

What is done with Normal Boil - off (NBO) vapour?

Accepted Answer

A: It is removed to maintain the cargo temperature and pressure

Answer

B: It is retained in the tanks as it has no effect

Answer

C: It is vented to atmospher

Answer

D: It is collected and stored in the buffer tank

Question 12

Which of these factors is not considered when calculating the heel to be retained onboard?

Accepted Answer

B: Saturated vapor pressuree of the cargo

Answer

A: Duration of ballast passage

Answer

C: Weather forecast for the loaded passage

Answer

D: Level restriction due to sloshing effect

Question 13

The vapour can be converted into liquid state through____________.

Accepted Answer

C: condensation

Answer

A: melting

Answer

B: boiling

Question 14

The state of gas at the temperature______________ its critical point is called vapour.

Accepted Answer

B: below

Answer

A: abov

Answer

C: at

Question 15

The balancing pipeline lying between the shore tank and the ship is called as________.

Accepted Answer

A: vapour return lin

Answer

B: vapour escape lin

Answer

C: vapour balancing lin

Question 16

The conversion of a liquid state into a vapour state is called____________.

Accepted Answer

B: vaporization

Answer

A: melting

Answer

C: condensation

Question 17

__________refers to the vapour of petroleum in the air with lowest proportion that will burn.

Accepted Answer

A: Lower explosive limit

Answer

B: Zero explosive limit

Answer

C: Minimum explosive limit

Question 18

The vapour, which is caught in the space over the incoming liquid and compressed, is sent to the______.

Accepted Answer

B: shore tank

Answer

A: compressor

Answer

C: suction unit

Question 19

Mole of hydrogen is________.

Accepted Answer

B: 2

Answer

A: 12

Answer

C: 32

Question 20

Onboard a LNG tanker, with NO 96 containment system, what happens to the cargo when a cargo tank suffers a major primary barrier failure?

Accepted Answer

A: The cargo will flood the primary insulation spac

Answer

B: The cargo will flow out to shipsid

Answer

C: All the cargo will boil - off immediately

Answer

D: The cargo will freeze up

Question 21

During a cargo handling operation which of the following precautions need not be observed to deal with spillage?

Accepted Answer

D: Shore spill team on standby mod

Answer

A: Deck spray pump (IMO) system on standby mod

Answer

B: Protective clothing used

Answer

C: Constant patrol of cargo area maintained

Question 22

What is the main danger when discharging a damaged cargo tank in a normal manner?

Accepted Answer

D: Collapse of the primary membranee due to high differential head

Answer

A: Discharging pump will trip due to debris in the tank

Answer

B: Discharging time will be shorter due to lesser cargo in the tank

Answer

C: Collapse of secondary membranee due to high differential head

Question 23

What is the definition for the term "minor failure of membrane?

Accepted Answer

D: Minor fatigue cracks, passing liquid into the insulation space and becomes gaseous

Answer

A: Activation of gas detection equipment for insulation despite of purging with nitrogen

Answer

B: Fatigue cracks develop with obvious signs of pressuree rise and the presence of methane vapor

Answer

C: Porosity of membranee which allows limited liquid into insulation spaces

Question 24

Onboard an LNG carrier, under what circumstances is purging or gassing up with LNG vapor is critical prior to cool down of cargo tanks?

Accepted Answer

B: If inert gas has been used for inerting

Answer

A: If nitrogen has been used for inerting

Answer

C: If time available for cool down is very short

Answer

D: If shore supply for cool down is not availabl

Question 25

In a membrane class LNG tanker, why is the cargo tank pressure increased from 20 mbar g to 150 mbar g at the end of operation?

Accepted Answer

C: To purge all equipment and pipelines thoroughly

Answer

A: To overcome back pressuree from the vent lin

Answer

B: To speed up the inerting process

Answer

D: To test the tanks prior to aerating

Question 26

What is the consequence of ice formation in a cargo tank?

Accepted Answer

C: Possible damagee to the cargo pump during discharging

Answer

A: Burst in the discharge lin

Answer

B: Formation of cold spot in ballast tank

Answer

D: Icing - up of the discharge pump

Question 27

Onboard a membrane class LNG Tanker, what is the ideal tank pressure to be maintained during the warming up operation?

Accepted Answer

D: >150 mbar gauge to give good suction for the HD compressors

Answer

A: Lowest possible pressuree to have good heat transfer process

Answer

B: Equal to atmospheric pressuree to allow for free flow of cargo vapor

Answer

C: Any pressuree is acceptabl

Question 28

Or the GT NO 96 containment system, what is the recommended cargo tanks inerting operation completion methane content?

Accepted Answer

B: Less than 3% volume of methan

Answer

A: 5% by volume of methane or mor

Answer

C: 7% by volume of methane or mor

Answer

D: 9% by volume of methane or mor

Question 29

Onboard a membrane class LNG tanker what is the ideal pressure differential to be maintained between the cargo tank and insulation spaces (IS)?

Accepted Answer

A: IS pressuree < cargo tank pressure

Answer

B: IS pressuree > cargo tank pressure

Answer

C: IS pressuree = cargo tank pressure

Answer

D: IS pressuree = cargo tank pressuree + ibar

Question 30

What precautions must be taken in the vicinity of the engine room bilges?

Accepted Answer

A: Should be clear of rubbish

Answer

B: Should be covered with muck and debris

Answer

C: Should be allowed to corrod

Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) (Set 10)

Which of these is not a possibility if by accident the insulation spaces are over pressurized?

Questions in GASCO Set 10

Question Discussion & Notes

Leave a Comment / Clarification