Question 1 of 15

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

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

Question 2 of 15

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

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

Question 3 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 4 of 15

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

• True
• False

Question 5 of 15

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

• If there is no restriction from the terminal, the venting should be done from the tank hatch.
• 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.
• Nitrogen is bubbled through the cargo to the vapour space on top at a slow and steady rate.

Question 6 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.
• Same as PV valve venting capacity.
• 1.25 time the PV valve venting capacity.
• 90% of PV valve venting capacity.

Question 7 of 15

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

• Nitrogen should be bubbled through the cargo at high rate after completion of loading.
• Any of given method can be used.
• 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 8 of 15

Is the following statement true or false? Line clearing of cargo lines after completion of loading can be done using a pig driven by the Nitrogen at a very low pressure.

• False
• True

Question 9 of 15

What is drying by Nitrogen?

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

• Hydrogen
• Carbon Dioxide
• Nitrogen
• Oxygen

Question 11 of 15

Is the following statement true or false? Nitrogen is a combustible gas and supports combustion.

• True
• False

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

Question 13 of 15

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

• Green
• Blue
• Black
• Red

Question 14 of 15

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

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

Question 15 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