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

Question 2 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.
• Over pressurising of cargo tanks.
• Contamination of cargo.

Question 3 of 15

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

• Nitrogen
• Carbon Dioxide
• Oxygen
• Hydrogen

Question 4 of 15

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

• False
• True

Question 5 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 in the ullage space to isolate the cargo from any contact with the atmosphere.
• When Nitrogen is used to reduce oxygen content of cargo tank for controlling the flammable atmosphere inside the tank.

Question 6 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 7 of 15

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

• Black
• Green
• Blue
• Red

Question 8 of 15

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

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

Question 9 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 10 of 15

Prior inerting the cargo tanks, which one of the following options should be done?

• All of the given options.
• PV valves should be locked in open position.
• PV valves should be tested for operation.
• All the tank valves should be closed.

Question 11 of 15

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

• False
• True

Question 12 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.
• Any of given method can be used.
• Nitrogen should be bubbled through the cargo at high rate after completion of loading.

Question 13 of 15

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

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

Question 14 of 15

What is inerting by Nitrogen?

• 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.
• When Nitrogen is used to reduce the dew point of the atmosphere of cargo tank.

Question 15 of 15

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

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