GASCO - Advanced Training for Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 5

Question 1

What characteristics should insulation materials possess for use in gas carriers?

Accepted Answer

D: All the abov

Answer

A: Low thermal conductivity, ability to bear loads

Answer

B: Ability to with stand mechanical damagee, lightweight

Answer

C: Unaffected by cargo liquid or vapour

Question 2

Which of the following is the ultimate source of energy for us?

Accepted Answer

C: Solar

Answer

A: LNG

Answer

B: Nuclear

Answer

D: CNG

Question 3

Why strainers are commonly installed in the cargo piping system?

Accepted Answer

C: Both A and B

Answer

A: To protect the cargo handling plant

Answer

B: To protect equipment from damagee by foreign objects

Answer

D: None of the abov

Question 4

Which of these would you consider essential equipment to carry when working on the deck of ship carrying ammonia?

Accepted Answer

C: Gas mask

Answer

A: Gloves

Answer

B: Personal O meter

Answer

D: Personal Hydrocarbon alarm

Question 5

What is the condition of inert gas as it is produced by the boilers or inert gas generator?

Accepted Answer

A: Free of oxygen and clean

Answer

B: Hot and containing soot particles

Answer

C: Dirty and saturated

Answer

D: Super heated and black or greyish in colour

Question 6

For what reason cargo sampling is necessary in gas tanker?

Accepted Answer

C: Both A and B

Answer

A: To establish safe conditions prior to cargo transfer

Answer

B: To establish that the cargo is within commercially agreed specifications at various Pumps

Answer

D: None of the abov

Question 7

What is the MAIN danger to be guarded against when discharging using a cargo heater with sea water as the heating medium?

Accepted Answer

B: Freezing of the water side of the heater

Answer

A: Over pressureizing of the gas side of the water

Answer

C: Over pressureizing of the water side of the heater

Answer

D: Overheating of the gas side of the heater

Question 8

Magnesium, Titanium, Sodium, Lithium and Potassium are classified as

Accepted Answer

D: Class D fir

Answer

A: Class A fir

Answer

B: Class B fir

Answer

C: Class C fir

Question 9

What are the symptoms of Asphyxiant , when LPG and LNG carried as cargo?

Accepted Answer

D: All of the abov

Answer

A: Increased rate and dept of respiration and loss of consciousness

Answer

B: Blueness of the skin (Cyanosis)

Answer

C: Stertorous breathing with a snoring sound

Question 10

Inert gas- How is sea water supplied to the deck seal ?

Accepted Answer

D: Through the deck seal pump fitted in the engine room

Answer

A: Through the main sea water pumps or through the condenser cargo pump

Answer

B: Through a sea water aggregate pump fitted on the cargo deck

Answer

C: Through the deck fire lin

Question 11

On tank vessels, which of these valve types is most commonly used in conjunction with hydraulically actuated controls?

Accepted Answer

C: Butterfly valves

Answer

A: Non return valves

Answer

B: Globe valves

Answer

D: Gate valves

Question 12

What is critical temperature of methane in °Celsius ?

Accepted Answer

A: -82.5

Answer

B: 82.5

Answer

C: 52.8

Answer

D: None of the abov

Question 13

On tank vessels equipped with the power operated cargo tank valves, the type of power operator most commonly used is _____

Accepted Answer

A: Hydraulic

Answer

B: Electric

Answer

C: Steam

Answer

D: Diesel

Question 14

The valve best suited for throttling gas or liquid flow in a pipe line is the _____

Accepted Answer

A: Globe valv

Answer

B: Gate valv

Answer

C: Check valv

Answer

D: Pug cock

Question 15

What is the boiling point at atmospheric pressure of ammonia

Accepted Answer

B: -34 °Celsius

Answer

A: -42 °Celsius

Answer

C: -5 °Celsius

Answer

D: None of the abov

Question 16

Which tanks are completely supported self-supporting and do not form part of the ship's hull structure

Accepted Answer

A: Independent tanks

Answer

B: Membrane tank

Answer

C: Semi membranee tank

Answer

D: None of the abov

Question 17

Ammonia forms explosive compounds with

Accepted Answer

B: Mercury, chlorine, iodine, bromine, calcium, silver oxide and silver hypo chlorit

Answer

A: Mercury alon

Answer

C: Silica

Answer

D: Water

Question 18

A bigger spell of LPG will be visible as a _____ which is condensed water vapour from the atmosphere

Accepted Answer

A: White cloud

Answer

B: Blue cloud

Answer

C: Black cloud

Answer

D: None of the abov

Question 19

How is BOIL OFF gas generated

Accepted Answer

D: All of the abov

Answer

A: Evaporation

Answer

B: Heat ingress

Answer

C: Drop in pressure

Question 20

In addition to water detection sensors fitted at secondary insulation spaces, which is the other typical sensing devices fitted to give an early indication of inner hull experiencing structural failure?

Accepted Answer

C: Water moisture detector inside secondary insulation spac

Answer

A: Water moisture detector inside primary insulation spac

Answer

B: Water moisture detector at the vapor dom

Answer

D: Water moisture detector inside wing ballast tank

Question 21

Which of the following can lead to major leak of insulation spaces?

Accepted Answer

B: Due to significant fatigue cracks on welds of cargo tank membranees

Answer

A: Due to hair line cracks inside membranee.

Answer

C: The gradual increase of methane content inside the insulation spac

Answer

D: Due to accidentally tripped of both HD and LD compressors

Question 22

Which of the following equipment is not used to lift an auxiliary cargo pump?

Accepted Answer

D: Manifold spool piece derrick

Answer

A: Electrical connection box

Answer

B: Chain block

Answer

C: Overhead railing

Question 23

What will happen to the liquid level within and pressure of a cargo tank when there is a big crack (major leak) in the cargo tank's primary membrane and adjacent insulation space, underneath the cargo level?

Accepted Answer

C: The liquid level will drop and pressuree will suddenly ris

Answer

A: The liquid level will increase and pressuree will suddenly increas

Answer

B: The liquid level will drop and pressuree will suddenly drop

Answer

D: The liquid level will increase and pressuree will be suddenly drop

Question 24

Onboard an LNG carrier, with NO 96 containment system, what is the maximum allowable differential head between the cargo tank and primary spaces liquid level during discharge operation from the damaged tank?

Accepted Answer

B: 500 mm of cargo level

Answer

A: 100 mm of cargo level

Answer

C: 50 mm of cargo level

Answer

D: 10 mm of cargo level

Question 25

In the event of major LNG spill which of the following action should not to be taken?

Accepted Answer

B: Inject cargo line with CO2, without stopping the cargo operation

Answer

A: Stop cargo operation

Answer

C: Close all accommodation doors and ventilation fans

Answer

D: Start the deck water spray (or IMO) pump

Question 26

What is the method used to prevent any further lowering of the hull steel temperature due to damaged insulation?

Accepted Answer

D: By flooding ballast tanks with sea water around any affected cargo tank

Answer

A: By flooding the ballast tanks with CO2 around the affected cargo tank

Answer

B: By sending ship's crew to scaling off the ice formed on the surfaces of the hull steel

Answer

C: By injecting nitrogen gas inside the ballast tanks around the affected cargo tank

Question 27

Which is the melting point temperature of the ESDS automatic fusible element normally fitted onboard?

Accepted Answer

D: Between 98°C to 104°C

Answer

A: Between 200°C to 206°C

Answer

B: Between 50°C to 55°C

Answer

C: Between 72°C to 78°C

Question 28

Identify the odd one. Onboard an LNG tanker with NO 96 containment system, which of the following is not a typical early indication of a major cargo leak into the insulation spaces?

Accepted Answer

D: There will be cold spots at the ship side close to the affected area

Answer

A: There will be a rapid increase of methane content in affected areas

Answer

B: Relief valve for the affected primary space may lift

Answer

C: Inner hull temperature will drop in affected areas

Question 29

Which of the following portable gas meters is used to monitor methane content during the inerting operation prior aerating?

Accepted Answer

D: Gas scop

Answer

A: M2 test tub

Answer

B: Hygrometer

Answer

C: Oxygen meter

Question 30

Onboard a membrane class LNG tanker, during purging cargo tanks with LNG, where is the sampling point for taking the gas readings?

Accepted Answer

D: At cargo tank loading line sample cock

Answer

A: Vaporiser outlet sample cock

Answer

B: Heater outlet sample cock

Answer

C: Vapor line sample cock

Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) (Set 5)

What characteristics should insulation materials possess for use in gas carriers?

Questions in GASCO Set 5

Question Discussion & Notes

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