GASCO - Advanced Training for Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 13

Question 1

The vapour remains in a __________ state till the condensation process is over.

Accepted Answer

A: Supersaturated

Answer

B: Undersaturated

Answer

C: Superheated

Question 2

pressure is commonly used for measuring vacuum and pressures.

Accepted Answer

B: Gaug

Answer

A: Absolut

Answer

C: Atmospher

Question 3

__________ is the standard measurement of atmospheric pressure, with respect to 760 mm or 29.90 Inches of mercury.

Accepted Answer

B: 1012.5 millibars

Answer

A: 912.5 millibars

Answer

C: 1212.5 millibars

Question 4

The effect of layering made up of two vapours or gases with different densities is called as____________

Accepted Answer

B: Stratification

Answer

A: weathering

Answer

C: Inertion

Question 5

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

Accepted Answer

D: Small flow of liquid into the crack will vaporize,cargo tank will remain the sam

Answer

A: Big flow of liquid into the crack will rapidly vaporize and cargo will be severely damageed

Answer

B: Small flow of liquid into the crack will vaporize cargo tank pressuree will increase tremendously increase tremendously

Answer

C: Big flow of liquid into the crack will vaporize and colaps the primary membranee inwards

Question 6

The grade of steel used for inner hull construction is designed so to withstand

Accepted Answer

B: The minimum temperature due to LMG contact

Answer

A: The main pressuree can be created by UNG voor in an enclosed spac

Answer

C: The minimun corrosion effect due to steel-air and seawater contact

Answer

D: The maximum explosion force that can be created by LNG vapor in an enclosed spac

Question 7

Identify the odd one. Each main cargo pump electric motor is protected from certain faults. Which of the following is an exception?

Accepted Answer

A: Delayed start

Answer

B: Thermal overload (over current)

Answer

C: Undercurrent (no load operation)

Answer

D: Imbalance between phases (single-phasing)

Question 8

Why does the cofferdam heating system have two sets of heating coils?

Accepted Answer

C: One in service and one on standby

Answer

A: One for starboard and one for port

Answer

B: One for upper and one for lower

Answer

D: One for forward part and one for aft part

Question 9

In an LNG carrier two types of cargo pumps are fitted in each cargo tank. Identify them by name.

Accepted Answer

C: Main cargo and stripping/spray pumps

Answer

A: Big cargo and small cargo pumps

Answer

B: Emergency and small cargo pumps

Answer

D: Emergency and big cargo pumps

Question 10

What are the two types ur heating medium which may be used for the typical cofferdam heating system onboard LNG carers?

Accepted Answer

B: Steam or glycol water

Answer

A: Seawater or R 404a

Answer

C: Warm air or brin

Answer

D: Alcohol solution or seawater

Question 11

Capacitance type gauges are reliable as they have no moving parts. Identify the condition under which they may fall?

Accepted Answer

B: Presence of water, dirt or rust

Answer

A: Presence of nitrogen and methan

Answer

C: When the tank is empty

Answer

D: When the tank is not full

Question 12

IGC Requirements on LNG vessels are stated below that will not include

Accepted Answer

B: The Gas Codes require every cargo tank to be fitted with at least two liquid level gauges

Answer

A: The Gas Codes and classification society rules require every cargo tank to be fitted with at least one squid level gaug

Answer

C: Chapter 19 of the 1GC code provides the requirements for gauging systems usiing onboard gas carriers.

Answer

D: This information is summarized in Appendix 2 of the same code.

Question 13

In ESDS pneumatic link system which equipment is used to sense and monitor the air pressure in the system so that the ESDS will activate if the air pressure in system Fall below set point

Accepted Answer

B: Pressure switch

Answer

A: Pressure regulator

Answer

C: Pressure control valv

Answer

D: Pressure dumping valv

Question 14

Why should the temperature of cofferdam and liquid domes be maintained above +5°C

Accepted Answer

D: If inner full temperature drops to sub-zero temperatures, it can suffer structural damage

Answer

A: To ensure no heat transfers from seawater through outer hull

Answer

B: To equal The Teperatures of the containment system and insulation spaces

Answer

C: to ensure space is warm for inner hull inspection

Question 15

Onboard an LNG carrier which computer based system is used to monitor and control cargo operations

Accepted Answer

A: Cargo control system

Answer

B: Custody transfer system

Answer

D: .Emergency shutdown system

Question 16

Where are the spray and stripping pumps normally installed onboard an LNG tanker?

Accepted Answer

C: Inside cargo tanks at the bottom end of tripod mast

Answer

A: At the end of cargo pipes in cargo pump room

Answer

B: At main deck close to liquid dome fittings

Answer

D: At main deck close to vapor dome fittings

Question 17

In an Air Dryer Plant in the first stage of drying process the air is cooled to around 5 degree by R 404A refrigeration plant during the second stage what drying agents is used to remove the remaining moisture?

Accepted Answer

B: Activated alumina

Answer

A: Silica gel

Answer

C: Perlite

Answer

D: Invar powder

Question 18

When using the main vaporizer to vaporize liquid nitrogen what should be fitted at the inlet of the vaporizer?

Accepted Answer

A: A removable bend

Answer

B: A gas filter

Answer

C: A valv

Answer

D: A liquid nitrogen detector

Question 19

During the nitrogen or cooling cycle in a reliquefaction plant, nitrogen is compressed in 3-stage centrifugal compressor. How is the compressor cooled?

Accepted Answer

A: Water cooling

Answer

B: Propane cooling / Butane cooling

Answer

C: Butane cooling

Answer

D: LNG cooling

Question 20

How should the activated alumina in the drying tank be regenerated after the dry air unit has been in use for sometimes (for about 20 hours) or when the high humidity alarm is given?

Accepted Answer

C: Back-flushing hot air through the tank

Answer

A: Shutting down the unit and restart the whole plant

Answer

B: Warming up the activated alumina outside the tank

Answer

D: Free flow air through the tank

Question 21

In the LNG re-liquefaction plant, Identify the factor with which the boil-off gas compressor capacity is adjusted automatically?

Accepted Answer

C: LNG Boll-off Rate(BOR)

Answer

A: LNG vapour density

Answer

B: LNG heat valu

Answer

D: LNG liquid density

Question 22

How is the LNG boil-off gas removed from the cargo tanks brought to the reliquefaction plant?

Accepted Answer

B: By low-duty compressors

Answer

A: By boll-off gas expanders

Answer

C: By forcing vaporizer

Answer

D: By force draught fans

Question 23

What is fitted to at the outlet of main and forcing steam vaporizers to ensure a stable output and avoid accumulation of non-vaporized liquid?

Accepted Answer

C: A re-evaporator

Answer

A: Demister

Answer

B: Spiral wires

Answer

D: Condensate level controller

Question 24

Normally for an air dryer plant, where possible; "regeneration process must be completed at least two (2) weeks before using the dry air plant. What does this action ensure?

Accepted Answer

B: Residual heat in the generated crier to dissipated

Answer

A: Residual heat in the regenerated drier is kept within the plant

Answer

C: Residual heat in the regenerated drier is increased

Answer

D: Residual heat in the regenerated drier is not disturbed

Question 25

Why is necessary to purge the auxiliary cargo pump column before the installation can commence?

Accepted Answer

C: To purge out the liquid (cargo) through bottom valve at ensure the column is inerted

Answer

A: To reduce the tank pressure

Answer

B: to ensure the column is filled to the top with cargo

Answer

D: To purge the air out through bottom valve and ensure column is inerted

Question 26

LNG tankship submerged cargo pump running procedure will not include,

Accepted Answer

A: The cargo pumps may be restarted after a failed start, a maximum of 4 times excluding the failed attempt

Answer

B: This procedure must be adhered to as heat build-up from the high starting current may not be carried away during stripping operations

Answer

C: This may be due to the lack of liquid flow when (and if) the pump does not prime, due to the extremely low level of LNG during stripping operations

Answer

D: Up to 30 seconds of operation with dry suction but with fluid in the discharge pipe will not damagee the pump or the motor

Question 27

What is an LNG carrier provided with to heat up LNG Vapeur delivered from compressors or vaporizers?

Accepted Answer

C: Steam heated gas heaters

Answer

A: Steam heated forcing vaporizers

Answer

B: Steam generators

Answer

D: Glycol water heated gas

Question 28

Of the two critical equipment of a typical membrane method nitrogen generator, one is the heater. Identify the other from option given

Accepted Answer

C: Oxygen analyzer

Answer

A: Methane analyzer

Answer

B: Carbon dioxide analyzer

Answer

D: Nitrogen analyzer

Question 29

Inert gas is used to eliminate__________________ from the LNG tank while gas freezing

Accepted Answer

B: LNG vapour

Answer

A: hydrogen

Answer

C: oxygen

Question 30

An air separation process is the most common system employed for producing __________on ships.

Accepted Answer

B: nitrogen

Answer

A: oxygen

Answer

C: hydrogen

Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) (Set 13)

The vapour remains in a __________ state till the condensation process is over.

Questions in GASCO Set 13

Question Discussion & Notes

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