LGTCO/LGTF - Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 4

Question 1

What is the critical pressure of Ethylene in bars absolute?

Accepted Answer

C: 50.5 bar absolute

Answer

A: 46.2 bar absolute

Answer

B: 38.8 bar absolute

Answer

D: 42.6 bar absolute

Question 2

An LNG fire is classified under which class of fire in maritime STCW standards?

Accepted Answer

C: Class C fire

Answer

A: Class A fire

Answer

B: Class B fire

Answer

D: Class D fire

Question 3

Which fixed fire-fighting system is mandatory for fire-fighting on the cargo deck of a liquefied gas carrier?

Accepted Answer

B: Fixed dry chemical powder (DCP) system

Answer

A: Fixed low-expansion foam system

Answer

C: Fixed CO2 flooding system

Answer

D: Fixed wet chemical fire-fighting system

Question 4

What should crew members do immediately when the ship's General Emergency Alarm sounds?

Accepted Answer

D: Wear PPE, lifejacket, carry immersion suit and proceed to the designated Muster Point as per the Ship's Muster List

Answer

A: Wear PPE, lifejacket, carry immersion suit and go to the navigation bridge

Answer

B: Wear PPE, lifejacket, carry immersion suit and go to the engine control room

Answer

C: Wear PPE, lifejacket, carry immersion suit and proceed to the forecastle

Question 5

What is Critical Temperature?

Accepted Answer

A: The temperature above which a gas cannot be liquefied by pressure alone

Answer

B: The temperature at which a gas changes state to liquid at atmospheric pressure

Answer

C: The temperature at which a gas becomes superheated

Answer

D: The temperature at which liquefied gas changes from liquid to gas during boiling

Question 6

What is Flammable Range?

Accepted Answer

B: The range of hydrocarbon vapor concentration in air between the LFL and UFL capable of burning

Answer

A: A mixture of flammable gas in air whose gas percentage is above the UFL

Answer

C: A mixture of flammable gas in air whose gas percentage is below the LFL

Answer

D: A gas mixture whose concentration is strictly between 0% and 10% LFL

Question 7

What is Flash Point?

Accepted Answer

B: The lowest temperature at which a liquid gives off sufficient vapour to form an ignitable mixture with air near its surface

Answer

A: The lowest temperature at which a liquid ignites spontaneously without a spark

Answer

C: The temperature at which a boiling liquid expanding vapor explosion (BLEVE) takes place

Answer

D: The lowest temperature required for self-sustained spontaneous combustion

Question 8

The ship's General Emergency Alarm signal is defined as:

Accepted Answer

B: Seven or more short blasts followed by one long blast on the ship's whistle and bells

Answer

A: Three long blasts on the ship's whistle and general alarm bells

Answer

C: Continuous sounding of the ship's whistle for more than 2 minutes

Answer

D: One continuous long blast followed by two short blasts

Question 9

What operation is done on fully refrigerated gas carriers before loading liquid cargo?

Accepted Answer

B: Cooling down

Answer

A: Gassing up

Answer

C: Inerting

Answer

D: Aerating

Question 10

What operation is done on fully refrigerated gas carriers before gassing up after drydock?

Accepted Answer

B: Inerting

Answer

A: Drying only

Answer

C: Cooling down

Answer

D: Aerating

Question 11

What is the chemical formula of Vinyl Chloride Monomer (VCM)?

Accepted Answer

A: C2H3Cl

Answer

B: CH3COCl

Answer

C: NaClO

Answer

D: CH4

Question 12

What is the chemical formula of Methane?

Accepted Answer

B: CH4

Answer

A: C2H6

Answer

C: C3H8

Answer

D: C2H4

Question 13

How many pressure relief valves must be fitted for cargo tanks above 20 m³ capacity on gas carriers?

Accepted Answer

B: At least two relief valves

Answer

A: At least one relief valve

Answer

C: At least three relief valves

Answer

D: At least four relief valves

Question 14

The critical temperature for Propane is:

Accepted Answer

A: 96.8°C

Answer

B: 100.4°C

Answer

C: 44.5°C

Answer

D: 32.1°C

Question 15

The critical temperature for Methane is:

Accepted Answer

B: -82.5°C

Answer

A: 32.1°C

Answer

C: 44.5°C

Answer

D: -64.8°C

Question 16

The critical temperature for Ethylene is:

Accepted Answer

C: 9.9°C

Answer

A: 1.2°C

Answer

B: 19.8°C

Answer

D: 32.1°C

Question 17

Independent Type B tanks on gas carriers are characterized as:

Accepted Answer

A: Completely self-supporting when full or empty

Answer

B: Self-supporting only when empty

Answer

C: Self-supporting only when full

Answer

D: Non-self-supporting membrane structures

Question 18

The maximum allowable tank design pressure in the vapour space for Independent Type A tanks is:

Accepted Answer

C: 0.7 barg

Answer

A: 0.9 barg

Answer

B: 0.25 barg

Answer

D: 18 barg

Question 19

The IGC Code stipulates that a secondary barrier must be capable of containing cargo leakage for a period of how many days?

Accepted Answer

B: 15 days

Answer

A: 10 days

Answer

C: 30 days

Answer

D: 45 days

Question 20

Type 'C' tanks are normally spherical or cylindrical pressure vessels having design pressures higher than:

Accepted Answer

B: 2.0 barg

Answer

A: 0.7 barg

Answer

C: 1.0 barg

Answer

D: 5.0 barg

Question 21

Semi-membrane tanks are:

Accepted Answer

C: Self-supporting only when empty

Answer

A: Completely self-supporting when loaded or empty

Answer

B: Self-supporting only when loaded

Answer

D: Non-self-supporting tanks under all conditions

Question 22

Liquefied gas is defined by the IGC Code as a liquid having a saturated vapour pressure exceeding:

Accepted Answer

A: 2.8 bar absolute at 37.8°C

Answer

B: 3.8 bar absolute at 37.8°C

Answer

C: 2.8 bar absolute at 27.8°C

Answer

D: 3.8 bar absolute at 27.8°C

Question 23

What is the mode of operation of fixed dry chemical powder (DCP) monitors on gas tanker decks?

Accepted Answer

B: Operation both locally and remotely

Answer

A: Only locally from deck

Answer

C: Only remotely from the navigation bridge or CCR

Answer

D: Automatic thermal sensor activation only

Question 24

How many independent fixed DCP units for fire-fighting are required on the deck of a gas carrier of cargo capacity 1,000 m³ and above?

Accepted Answer

B: At least two independent DCP units

Answer

A: At least one independent DCP unit

Answer

C: At least three independent DCP units

Answer

D: At least four independent DCP units

Question 25

What is the minimum discharge time for a deck fixed DCP system with all monitors and hand-held hoses operating?

Accepted Answer

C: 45 seconds

Answer

A: 25 seconds

Answer

B: 35 seconds

Answer

D: 60 seconds

Question 26

How many monitors are fitted in a fixed DCP installation for deck fire-fighting on gas ships?

Accepted Answer

C: At least three monitors

Answer

A: At least one monitor

Answer

B: At least two monitors

Answer

D: At least four monitors

Question 27

What is the atmospheric boiling point of Chlorine?

Accepted Answer

D: -34°C

Answer

A: -45°C

Answer

B: -25°C

Answer

C: -39°C

Question 28

What is the atmospheric boiling point of Ammonia (Anhydrous NH3)?

Accepted Answer

A: -33.4°C

Answer

B: -45.4°C

Answer

C: -42.4°C

Answer

D: -29.6°C

Question 29

What is the atmospheric boiling point of Propylene (Propene)?

Accepted Answer

B: -47.7°C

Answer

A: -42.4°C

Answer

C: -103.9°C

Answer

D: -63.4°C

Question 30

What are Carbamates in gas shipping chemistry?

Accepted Answer

A: A white powdery substance produced by the reaction of ammonia with carbon dioxide

Answer

B: Compounds formed by the interaction of water and hydrocarbons at certain pressures and temperatures

Answer

C: Compounds formed by the chemical combination of cargo liquid with oxygen

Answer

D: The chemical union of two or more identical molecules into a polymer

Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF) (Set 4)

What is the critical pressure of Ethylene in bars absolute?

Questions in LGTCO/LGTF Set 4

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