OCTO Exit Exam Question and Answer updated set - 3

This OCTO exit exam questions and answer quiz contain questions Answer

If you find any questions incorrect, please let us know by Clicking here.

1. Electrons have:

No charge

Positive charge

Negative charge


2. How to reduce Hydrogen Sulphide Hazard in Residual Fuel Oils?

Ventilation to lower the concentration of vapor in the ullage space and in specific areas where vapors may accumulate should be carried out as soon as practicable. 

Transfer the oil to some other tank using fuel transfer pump,

Keep heating the oil to maintain a higher temperature

Circulate the oil in the same tank using the cargo pump


3. Inert gas is introduced to cargo tank to:

Lower the LEL of cargo vapor.

To make the cargo vapors a lean mixture of hydro carbons

To exclude oxygen and thus prevent fire or explosion.


4. What is Cargo inhibition?

All chemical cargo physical and chemical properties change. during transportation; to avoid this, certain inhibitors are added to the cargo

For some chemical cargoes. under heat and in presence of oxygen, their physical and Chemical properties change. To avoid this certain inhibitor are added to the cargo

Some chemical cargoes have some physical and chemical properties that change due to cold weather in presence of oxygen, to avoid this. Certain inhibitors are added to the cargo

Adding Inhibitors to a refined vegetable oil adds its market value as the inhibitor maintains its color


5. Why are inhibitors added in the cargo?

Inhibitors are added by the ship staff before loading are Toxic. Inhibited cargoes often need oxygen hence should be carried in inerted tanks.

Inhibitors are added by the Terminal before loading are Toxic. Inhibited cargoes often need oxygen hence should not be carried in inerted tanks.  

Inhibitors that are added by the Terminal before loading are Non-Toxic. Inhibited cargoes do not need oxygen and can be carried in inerted tanks.

Once the cargo is inhibited, its temperature is never a concern for cargo carriage


6. The main elements of peak safety performance are

reducing the number of accidents to less than 5 % of the previous year's accidents

reducing the number of pollution incidents to less than 2 % of the previous year pollution incidents.

No operational incidents, no personal injuries and no harm to the environment.


7. Organizational safety value aims at:

< 2 incidents in a year

reduce incidents to less than 10 % of incidents in the previous year

Zero incident program

allow only one incident per year.


8. What factor mainly affects Vapor cloud dilution rate?

Quantity of Spill

Weather conditions             

Thermal inversion

diameter of the vapor cloud    


9. How is the Putrefaction process connected to Carbon Monoxide?

Putrefaction process generates obnoxious and toxic vapors

Putrefaction process depletes the oxygen in the tank due to chemical reaction

Putrefaction process generates obnoxious and toxic vapors and these depletes the oxygen in the tank due to chemical react ion

Purification occurs due to a decrease in tank temperature


10. Chemical cargo vapors can enter the human body due to:

Continuous working on deck.

Working i n the pump room

Inhalation, skin contact and also swallowing.   

Improper use of proper PPE


11. Key Features and Measurement of an Effective Safety Culture; identify one statement that identifies an effective safety culture

Recognition that all accidents are preventable and only usually occur following unsafe actions or a failure to follow established procedures

Individual seafarers assume responsibility for safety rather than relying on others to provide it

Through mutual respect, increasing confidence in the value of the safety culture results in a more effective Safety Management System

A safety management system that is always setting targets for continuous improvement, with a goal of zero accidents


12. Paraffinic, Paraffinic- Naphthenic and Aromatic Intermediate are the three classifications of

Natural gas

Crude oil      




13. Higher viscosity means

Proper atomization of fuel

Rich atomization of fuel

Poor atomization of fuel


14. What is the sulfur content in natural gas of typical petroleum?


0. 1 - 6%

2 - 8%

12 - 15%


15. Vapor density of most of the chemical cargoes is

Lighter than air

Heavier than air       

Same as air density


16. What is the effect of intermolecular forces on vapor pressure?

Relatively strong force will increase vapor pressure

Relatively strong force will decrease vapor pressure

Relatively weak force will decrease vapor pressure

Relatively weak force does not have any effect on vapor pressure


17. Of the hydrocarbons found in nature, which Is the lighter fraction of hydrocarbons, which can be free or dissolved?

Crude oil


Refined oil

Natural gas  


18. The product of coefficient of viscosity, surface area and the velocity difference between layers of flowing liquid is:

Viscosity of Liquid

Force of friction between liquid layers 

Velocity of the fluid

Vapor pressure of liquid


19. The stretcher for emergency rescue from pump room should be

Available close to, the pump room

Kept permanently rigged for hoisting an injured person

Kept in ship's hospital and clearly marked


20. What do you understand from the term "Bleed off COW"?

The process of pressure testing the COW lines onboard

The process of diverting part of cargo discharged for reducing rate

The process of diverting part of cargo discharged for crude oil washing  

The process of draining oil from the COW lines after washing


21. In the displacement method of purging and inerting, the inert gas

enters from the top of the tank

enters from the bottom of the tank

mixes with the original tank atmosphere

could enter from the bottom or the top of the tank


22. Your vessel is taking on fuel when a small leak develops in the hose. You order the pumping to be stopped. Before you resume pumping, you should

Notify the terminal superintendent

Place a large drip pan under the leak and plug in the scuppers

Repair the hose with a patch

Replace the hose

23. Submersible pumps found in chemical tankers are normally made of

Aluminum alloy


stainless steel     

Nickel alloy


24. An inert gas generator burns what oil to generate inert gas?

Crude oil

Heavy oil

Diesel oil

Gas oil


25. Cargoes should not be loaded into a tank that is not specially for that duty if it exceeds normal atmospheric pressure at

60.0 Deg C (140 Deg F)

15.6 Deg C (60 Deg F)

25 .0 Deg C (77 Deg F)

37 .8 Deg C (100 Deg F)


26. What Is the safety margin of tank volume, when calculating filling ratio of a cargo which needs heating during its carriage?

5% of the Tank capacity

10% of the Cargo capacity

2% of the Tank capacity      

1% of the Tank capacity


27. The ring main pipeline system is extensively used on:


Crude oil tankers

Medium range tankers

Product carriers


28. Which of the following statements is not true with regard to chemical tanker pump room?

Pump discharge pressures can be read from outside the pump room

Pump room bilge system can be operated from outside the pump room

The ladders for normal access should not be vertical and should have platforms

Rescue equipment for hoisting injured people should be available at the deck store  

29. You are operating a non- ocean-going vessel, how much of the accumulated oily waste must you be able to retain on board?






30. A small fuel spillage occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by, the next step is to 

Proceed with fueling operation

Have helicopter move to a safer location

wash spilled fuel away with a flood of water  

Clean spilled fuel with rags

Post a Comment

* Please Don't Spam Here. All the Comments are Reviewed by Admin.