Question 1 of 15

Which cargo can cause blockage of PV vent valves during padding of a tank?

• Toxic cargo.
• Low pour point cargo.
• High pour point cargo.
• Combustible or flammable cargo.

Question 2 of 15

What is drying by Nitrogen?

• When Nitrogen is used to reduce the dew point of the atmosphere of the 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 3 of 15

What is padding by Nitrogen?

• 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.
• When Nitrogen is used in the ullage space to isolate the cargo from any contact with the atmosphere.

Question 4 of 15

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

• Blue
• Black
• Red
• Green

Question 5 of 15

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

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

Question 6 of 15

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

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

Question 7 of 15

What is inerting by Nitrogen?

• 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.
• When Nitrogen is used to reduce the dew point of the atmosphere of cargo tank.
• None of the given options.

Question 8 of 15

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

• 2100 mmwg
• 350 mmwg
• 3500 mmwg

Question 9 of 15

Is the following statement true or false? Nitrogen is an Inert gas.

• False
• True

Question 10 of 15

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

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

Question 11 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.

• True
• Fasle

Question 12 of 15

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

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

Question 13 of 15

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

• Nitrogen
• Carbon Dioxide
• Hydrogen
• Oxygen

Question 14 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.
• High pressure (200 bars) nitrogen bottle bank.
• Shore based supply via manifold lines.
• Nitrogen generator onboard.

Question 15 of 15

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

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