Question 1 of 15

Which manual should be referred to for maximum purging rate when purging using nitrogen from shore by vapour line?

• SOLAS training manual.
• VECS manual.
• PV vent valves manual.
• Cargo loading manual.

Question 2 of 15

What is padding by Nitrogen?

• When Nitrogen is used in the ullage space to isolate the cargo from any contact with the atmosphere.
• When Nitrogen is used to reduce the dew point of the atmosphere of the cargo tank.
• When Nitrogen is used to reduce oxygen content of cargo tank for controlling the flammable atmosphere inside the tank.

Question 3 of 15

What is the maximum inflow allowed if venting of nitrogen gas during padding is not permitted at deck level?

• 80 % of the PV valve venting capacity.
• 90% of PV valve venting capacity.
• Same as PV valve venting capacity.
• 1.25 time the PV valve venting capacity.

Question 4 of 15

Which one of the following can Nitrogen not be used for on board a ship?

• Padding of cargo tanks.
• Drying of cargo tanks.
• Gas freeing of cargo tanks.
• Inerting of cargo tanks.

Question 5 of 15

Which of the following is the main constituent of atmosphere surrounding us?

• Hydrogen
• Carbon Dioxide
• Oxygen
• Nitrogen

Question 6 of 15

What is the approximate pressure that a standard cargo tank on a chemical tanker is designed to withstand?

• 3500 mmwg
• 350 mmwg
• 2100 mmwg

Question 7 of 15

Is the following statement true or false? Placards/notices/warning notes on the tank domes should be in the native language of the crew.

• Fasle
• True

Question 8 of 15

If the vessel is equipped with a nitrogen bottle bank, which colour are the nitrogen bottles coded with?

• Red
• Green
• Black
• Blue

Question 9 of 15

What is inerting by Nitrogen?

• When Nitrogen is used to reduce the dew point of the atmosphere of cargo tank.
• None of the given options.
• When Nitrogen is used to reduce oxygen content of cargo tank for controlling the flammable atmosphere inside the tank.
• When Nitrogen is used in the ullage space to isolate the cargo from any contact with the atmosphere.

Question 10 of 15

Which one of the following precautions are required when padding the tanks after completion of loading?

• Nitrogen is bubbled through the cargo to the vapour space on top at a slow and steady rate.
• All of the given options.
• Person monitoring the Oxygen content should wear personal oxygen meter and / or multi gas detector to monitor the surrounding atmosphere.
• If there is no restriction from the terminal, the venting should be done from the tank hatch.

Question 11 of 15

In the case of padding a cargo tank with Nitrogen, which one of the following is the most preferred method?

• Any of given method can be used.
• Nitrogen should be bubbled through the cargo at high rate after completion of loading.
• Nitrogen should be bubbled through the cargo at a very slow and steady rate after completion of loading.
• Purge the tank prior loading and during loading the nitrogen should be vented maintaining +ve pressure inside the tank.

Question 12 of 15

Which of the following hazards is not associated with the nitrogen related operations onboard chemical tanker?

• Spill of cargo on deck.
• Development of oxygen deficient atmosphere in the vicinity of tank hatch or tank cleaning hatch.
• Contamination of cargo.
• Over pressurising of cargo tanks.

Question 13 of 15

Which source of nitrogen can cause the cargo tanks prone to over-pressurisation during padding or purging operation?

• All of the given options.
• Shore based supply via manifold lines.
• High pressure (200 bars) nitrogen bottle bank.
• Nitrogen generator onboard.

Question 14 of 15

What is the purity of Nitrogen gas available/supplied onboard?

• 75% to 79.99%.
• 85% to 89.99%.
• 65% to 69.99%.
• 95% to 99.99%.

Question 15 of 15

What is drying by Nitrogen?

• When Nitrogen is used to reduce oxygen content of cargo tank for controlling the flammable atmosphere inside the tank.
• None of the given options.
• When Nitrogen is used to reduce the dew point of the atmosphere of the cargo tank.
• When Nitrogen is used in the ullage space to isolate the cargo from any contact with the atmosphere.