GASCO - Advanced Training for Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 1

Question 1

What is the primary component of Liquefied Natural Gas (LNG)?

Accepted Answer

A: Methane

Answer

B: Butane

Answer

C: Propane

Answer

D: Ethane

Question 2

At atmospheric pressure, what is the approximate boiling point of methane?

Accepted Answer

D: 162°C

Answer

A: 42°C

Answer

B: 104°C

Answer

C: 0°C

Question 3

Which code governs the construction and equipment of ships carrying liquefied gases in bulk?

Accepted Answer

A: IGC Code

Answer

B: IMSBC Code

Answer

C: IMDG Code

Answer

D: IBC Code

Question 4

What is the function of Boil-Off Gas (BOG) on an LNG carrier?

Accepted Answer

D: It is generated due to heat ingress and can be used as fuel or re-liquefied

Answer

A: It is dumped directly into seawater

Answer

B: It must be vented continuously into the atmosphere

Answer

C: It is used to extinguish boiler fires

Question 5

What gas is used to inert cargo tanks on gas carriers before introducing gas cargo?

Accepted Answer

A: Dry Nitrogen or Inert Gas with low O2

Answer

B: Oxygen

Answer

C: Compressed air

Answer

D: Carbon Dioxide only

Question 6

What is the Maximum Allowable Relief Valve Setting (MARVS) for a Type C independent tank on an LPG carrier?

Accepted Answer

D: Greater than 0.7 bar gauge

Answer

A: Always negative pressure

Answer

B: Exactly 0.0 bar gauge

Answer

C: Less than 0.1 bar gauge

Question 7

What risk is associated with rapid liquid cargo release onto steel deck structures?

Accepted Answer

B: Brittle fracture of hull steel due to extreme cold

Answer

A: Steel expansion and warping

Answer

C: Corrosion of hull plates

Answer

D: Immediate magnetic interference

Question 8

What type of pumps are most commonly used submerged inside LNG cargo tanks?

Accepted Answer

C: Submerged electric motor driven centrifugal pumps

Answer

A: Steam reciprocating pumps

Answer

B: Screw positive displacement pumps

Answer

D: Diaphragm hand pumps

Question 9

What instrument measures low concentration flammable gas by catalytic oxidation?

Accepted Answer

A: Explosimeter (Combustible Gas Indicator)

Answer

B: Hydrometer

Answer

C: Paramagnetic Oxygen Analyzer

Answer

D: Hygrometer

Question 10

What safety feature automatically trips cargo valves and pumps during an emergency ESD activation?

Accepted Answer

D: Emergency Shutdown System (ESD)

Answer

A: Quick Release Towing Hook

Answer

B: Auto-ignition Override

Answer

C: Manual Bilge Injection

Question 11

Under STCW Code Table A-V/1-2-2, what is the mandatory requirement regarding regulatory compliance and STCW code requirements during Advanced Liquefied Gas Tanker operations?

Accepted Answer

B: Strict compliance with approved safety procedures and flag state regulations

Answer

A: Applicable only during drydock operations

Answer

C: Verbal recommendation without documentation

Answer

D: Optional adherence based on vessel size

Question 12

What specific safety precaution must be observed when managing regulatory compliance and STCW code requirements for Advanced Liquefied Gas Tanker on board?

Accepted Answer

A: Conducting a thorough risk assessment and briefing all involved personnel prior to starting work

Answer

B: Proceeding without informing the officer on watch

Answer

C: Delegating tasks exclusively to untrained crew members

Answer

D: Disabling automated safety alarms to save time

Question 13

What is 'rollover' in an LNG cargo tank?

Accepted Answer

B: Rapid mixing of two stratified liquid layers of different densities leading to sudden high gas evolution

Answer

A: Over-rotation of the submerged pump impeller

Answer

C: Physical capsizing of the ship

Answer

D: Sloshing of cargo causing physical tank deformation

Question 14

What is the primary hazard of Ammonia ($NH_3$) when carried on gas tankers?

Accepted Answer

B: High toxicity, corrosive nature, and stress corrosion cracking in steel

Answer

A: Non-flammable under all temperature conditions

Answer

C: Zero toxicity and inert behavior

Answer

D: High radio-activity

Question 15

What insulation material is widely used in LNG membrane tanks?

Accepted Answer

A: Reinforced Polyurethane Foam (R-PUF) and Plywood Boxes with Perlite

Answer

B: Solid lead sheets

Answer

C: Fiber glass wool only

Answer

D: Concrete slabs

Question 16

What is the function of the water spray system on a gas carrier upper deck?

Accepted Answer

C: Cool cargo tank domes, accommodation boundaries, and absorb toxic or flammable gas leaks

Answer

A: Clean the deck paintwork

Answer

B: Provide fresh drinking water to crew

Answer

D: Lubricate cargo manifold connections

Question 17

Before gas-freeing a cargo tank that contained flammable gas, what step must be taken first?

Accepted Answer

C: Inert the tank with Nitrogen or inert gas until hydrocarbon content is below LFL

Answer

A: Turn on electric deck heaters

Answer

B: Open all deck hatches immediately to fresh air

Answer

D: Fill the tank with sea water

Question 18

What is the purpose of the primary membrane in a Gaztransport membrane LNG containment system?

Accepted Answer

A: Liquid-tight barrier containing the cargo liquid

Answer

B: Outer weather deck protection

Answer

C: Thermal insulation layer only

Answer

D: Structural hull stiffener

Question 19

What device is installed on gas carrier vents to prevent flame propagation into cargo tanks?

Accepted Answer

B: Flame screen or flame arrestor

Answer

A: Orifice plate

Answer

C: Butterfly valve

Answer

D: Non-return flap

Question 20

What is Custody Transfer Measurement System (CTMS) used for on an LNG carrier?

Accepted Answer

D: Accurately measuring cargo volume, temperature, and pressure for financial transfer

Answer

A: Monitoring crew cabin temperature

Answer

B: Tracking ship GPS position

Answer

C: Calculating engine oil consumption

Question 21

What is the upper explosive limit (UEL) of methane in air?

Accepted Answer

D: Approximately 15%

Answer

A: Approximately 90%

Answer

B: Approximately 5%

Answer

C: Approximately 50%

Question 22

What personal protective equipment must be worn when sampling toxic liquefied gases?

Accepted Answer

D: Full protective suit, SCBA or air-line respirator, and chemical-resistant gloves

Answer

A: Dust mask and safety shoes

Answer

B: Standard cotton coveralls only

Answer

C: Sunglasses and leather gloves

Question 23

Which international regulation specifies the minimum standard for regulatory compliance and STCW code requirements concerning Advanced Liquefied Gas Tanker?

Accepted Answer

A: STCW Code Section A-V/1-2-2 and relevant SOLAS/MARPOL conventions

Answer

B: Tonnage Measurement Convention 1969

Answer

C: Port State Control advisory note only

Answer

D: International Load Line Certificate Annex 3

Question 24

In the event of an emergency involving regulatory compliance and STCW code requirements during Advanced Liquefied Gas Tanker tasks, what immediate action is required?

Accepted Answer

A: Raise the alarm, notify the Officer of the Watch, and execute assigned muster list duties

Answer

B: Attempt to resolve the incident silently without raising the alarm

Answer

C: Wait until the end of the watch to log the issue

Answer

D: Evacuate the vessel immediately without informing the bridge

Question 25

What does LPG stand for?

Accepted Answer

A: Liquefied Petroleum Gas

Answer

B: Liquefied Propylene Gasoline

Answer

C: Low Pressure Gas

Answer

D: Liquid Processed Gas

Question 26

In a fully refrigerated LPG carrier, at what temperature is propane typically carried at atmospheric pressure?

Accepted Answer

B: 42°C

Answer

A: +15°C

Answer

C: 5°C

Answer

D: 162°C

Question 27

What gas detection method is used in continuous gas monitoring systems in interbarrier spaces?

Accepted Answer

A: Infrared gas absorption analyzers

Answer

B: Litmus paper strips

Answer

C: Visual observation glass

Answer

D: Smoke detectors

Question 28

What is the function of the secondary barrier in an LNG containment system?

Accepted Answer

D: Contain cargo leakage for a specified period if the primary barrier fails

Answer

A: Prevent seawater entry into ballast tanks

Answer

B: Provide structural strength to the main deck

Answer

C: Hold engine exhaust gas

Question 29

Why must cargo tanks be cooled down gradually before loading cryogenic liquid cargo?

Accepted Answer

D: Prevent excessive thermal stress and deformation of tank structure and pumps

Answer

A: Increase loading speed

Answer

B: Save electrical power

Answer

C: Prevent rust formation

Question 30

What is the typical maximum oxygen content allowed in Nitrogen used for inerting gas tanks?

Accepted Answer

B: 0.5% to 1.0% by volume

Answer

A: 8.0% by volume

Answer

C: 15.0% by volume

Answer

D: 21.0% by volume

Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) (Set 1)

What is the primary component of Liquefied Natural Gas (LNG)?

Questions in GASCO Set 1

Question Discussion & Notes

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