LGTCO/LGTF - Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 3

Question 1

Liquefied gas tankers are categorized as per the cargoes carried, as follows:

Accepted Answer

A: LPG ships, LEG ships, LNG ships, Chlorine ships, LPG / Chemical ships

Answer

B: LPG ships, Reefer Container ships, Bulk carriers

Answer

C: Fully pressurized ships, Semi-pressurized ships, Fully refrigerated ships

Answer

D: Oil tankers, Ro-Ro carriers, Chemical carriers

Question 2

There are three types of gas tankers according to the carriage condition, such as:

Accepted Answer

D: Fully pressurized ships, Semi-pressurized ships, Fully refrigerated ships

Answer

A: LPG ships, Reefer ships, Container ships

Answer

B: LPG ships, LEG ships, LNG ships

Answer

C: Chlorine ships, LPG/Chemical ships, Reefer container ships

Question 3

The cargo area of a gas tanker which is not equipped in an approved manner to ensure that its atmosphere is at all times maintained in a safe manner is a:

Accepted Answer

C: Gas-dangerous space

Answer

A: Gas-safe space

Answer

B: Airlock

Answer

D: Machinery space

Question 4

A space other than a gas-dangerous space is known as:

Accepted Answer

D: Gas-safe space

Answer

A: Airlock

Answer

B: Air handling unit

Answer

C: Enclosed space

Question 5

Air intakes for accommodation and engine-room have to be at a minimum safe distance from ventilation outlets from:

Accepted Answer

A: Gas-dangerous spaces

Answer

B: Gas-safe spaces

Answer

C: Main deck

Answer

D: Airlocks

Question 6

Can hot work in dangerous and hazardous areas be carried out during cargo, tank cleaning, gas freeing, purging or inerting operations?

Accepted Answer

B: No, hot work is strictly prohibited during these operations

Answer

A: Yes, with general supervision

Answer

C: Can be carried out as long as a cold work permit is obtained

Answer

D: Yes, provided the fire main is pressurized

Question 7

Access from a gas-dangerous zone on the open weather deck to a gas-safe space is arranged through:

Accepted Answer

B: An airlock

Answer

A: The accommodation alleyway

Answer

C: The motor room

Answer

D: The compressor room

Question 8

Airlock doors should be self-closing and must not have hooks or hold-open devices. There should be a minimum distance of at least _____ between both doors.

Accepted Answer

B: 1.5 metres

Answer

A: 0.5 metres

Answer

C: 1.0 metres

Answer

D: 2.0 metres

Question 9

An audible and visual alarm system gives a warning on both sides of the airlock when:

Accepted Answer

A: More than one door is moved from the closed position

Answer

B: One door is moved from the closed position

Answer

C: One door cannot be opened

Answer

D: Both doors cannot be opened

Question 10

The gas-safe and airlock spaces within the cargo area have:

Accepted Answer

B: Positive pressure ventilation

Answer

A: Negative pressure ventilation

Answer

C: Natural ventilation

Answer

D: Air conditioning only without positive pressure

Question 11

When the over-pressure of an airlock or gas-safe space is lost:

Accepted Answer

A: All electrical equipment that is not of a certified safe type should be de-energized

Answer

B: All electrical equipment that is of a certified safe type should be de-energized

Answer

C: All electrical equipment should continue running without interruption

Answer

D: All electrical equipment, both certified and non-certified, must be de-energized immediately

Question 12

Segregation, separation and airlocks are fundamental to the safety of:

Accepted Answer

B: Gas tankers

Answer

A: Oil tankers

Answer

C: Chemical tankers

Answer

D: Container ships

Question 13

Can LNG and LPG be used as fuel in a ship's engine room?

Accepted Answer

C: Yes, both can be used under relevant IGF/IGC Code requirements

Answer

A: Only LPG can be used

Answer

B: Only LNG can be used

Answer

D: No, none can be used

Question 14

List the dryers used with an Inert Gas Generator on gas ships to dry the inert gas generated:

Accepted Answer

A: Refrigerated drier and absorption (desiccant) drier

Answer

B: Only refrigerated dryer

Answer

C: Only absorption dryer

Answer

D: None of the above; only demister pads are used

Question 15

Can cargo be loaded if the MSDS (Material Safety Data Sheet) for the cargo is not supplied by the shipper or terminal?

Accepted Answer

B: No, cargo must not be loaded without the official MSDS

Answer

A: Yes, if cargo details are verbally communicated

Answer

C: Yes, it does not make a difference

Answer

D: Yes, provided the vessel has loaded similar cargo before

Question 16

What is the atmospheric boiling point of Methane?

Accepted Answer

C: -161.5°C

Answer

A: -0.5°C

Answer

B: -104°C

Answer

D: -41.5°C

Question 17

What is the atmospheric boiling point of Butane (n-Butane)?

Accepted Answer

A: -0.5°C

Answer

B: -42°C

Answer

C: -88.6°C

Answer

D: -104°C

Question 18

What is the vapour relative density of Methane? (Air = 1)

Accepted Answer

B: 0.554

Answer

A: 1.058

Answer

C: 1.55

Answer

D: 2.09

Question 19

What is the vapour relative density of Propane? (Air = 1)

Accepted Answer

B: 1.55

Answer

A: 0.554

Answer

C: 0.20

Answer

D: 0.80

Question 20

What is the vapour relative density of n-Butane? (Air = 1)

Accepted Answer

B: 2.09

Answer

A: 0.90

Answer

C: 2.60

Answer

D: 1.70

Question 21

What is the operation carried out prior to cooling down the tanks on fully refrigerated liquefied gas carriers?

Accepted Answer

A: Gassing up

Answer

B: Inerting

Answer

C: Aerating

Answer

D: Gas freeing

Question 22

What is the operation carried out prior to gassing up the tanks on liquefied gas carriers?

Accepted Answer

D: Inerting

Answer

A: Gas freeing

Answer

B: Aerating

Answer

C: Cooling down

Question 23

What is the vapour relative density of Chlorine? (Air = 1)

Accepted Answer

B: 2.49

Answer

A: 2.00

Answer

C: 1.55

Answer

D: 0.55

Question 24

Requirement for cargo tank entry with respect to tank atmosphere check of hydrocarbon content:

Accepted Answer

B: Hydrocarbon content must be less than 1% LFL

Answer

A: Hydrocarbon content must be more than 10% LFL

Answer

C: Hydrocarbon content must be above the UFL

Answer

D: Hydrocarbon content must be between LFL and UFL

Question 25

What is the auto-ignition temperature of Ethylene Oxide?

Accepted Answer

C: 429°C

Answer

A: 452°C

Answer

B: 509°C

Answer

D: 396°C

Question 26

What is the auto-ignition temperature of Propylene Oxide?

Accepted Answer

A: 465°C

Answer

B: 509°C

Answer

C: 416°C

Answer

D: 396°C

Question 27

What is the critical pressure of Propane in bars absolute?

Accepted Answer

B: 42.6 bar absolute

Answer

A: 38.1 bar absolute

Answer

C: 50.2 bar absolute

Answer

D: 46.2 bar absolute

Question 28

What is the critical pressure of n-Butane in bars absolute?

Accepted Answer

A: 38.1 bar absolute

Answer

B: 42.6 bar absolute

Answer

C: 52.6 bar absolute

Answer

D: 32.2 bar absolute

Question 29

What is the critical pressure of Methane in bars absolute?

Accepted Answer

C: 44.7 bar absolute

Answer

A: 50.3 bar absolute

Answer

B: 34.3 bar absolute

Answer

D: 65.2 bar absolute

Question 30

What is known as Inert Gas?

Accepted Answer

A: Non-flammable gases containing insufficient oxygen to support combustion

Answer

B: Flammable gas with concentration between LEL and UFL limits

Answer

C: Flammable gas with concentration above UFL limits

Answer

D: Toxic gas having concentration percentage below TLV-TWA

Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF) (Set 3)

Liquefied gas tankers are categorized as per the cargoes carried, as follows:

Questions in LGTCO/LGTF Set 3

Question Discussion & Notes

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