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Mintra Test Online about Enclosed Places Are Dangerous Places

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Welcome to the website where you can pass online the Mintra test on the subject «Enclosed Places Are Dangerous Places». Practice like this will help you as a marine specialist improve your knowledge with the help of online studying and appraisal practice. Mintra based on practical information and marine specialists experience.

The Mintra Test Online about Enclosed Places Are Dangerous Places covers the hazards associated with entering enclosed spaces on board ships, including oxygen deficiency, atmospheric risks, required safety equipment, entry procedures, and emergency consequences. It focuses on safe enclosed-space entry practices, risk awareness, and the importance of following established safety checks and permit procedures.

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Amount of questions: 20.

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In the opening scene of the programme, we see an officer accompanied by how many seafarers?
2.
3.
4.
Before entering the enclosed space, which safety checks did the officer carry out?
He tested the entry door.
He tested his radio.
None.
What safety equipment did the seafarer who followed the officer into the enclosed space have with him?
His helmet.
A life line.
A safety harness.
Why are enclosed spaces dangerous?
The atmosphere inside enclosed spaces lacks adequate oxygen.
They are seldom ventilated.
They have limited entry and exit openings.
What are the consequences of someone entering an enclosed space without checking the oxygen level inside?
Loss of balance.
Loss of consciousness.
Death.
All of the above.
What is the normal level of oxygen in the atmosphere?
8 %.
20,9 %.
50 %.
What are the reasons for oxygen depletion in enclosed spaces on board ships?
Rusting of steel walls.
Deterioration of some organic cargos.
Cargo vapours filling the atmosphere in enclosed cargo holds.
All of the above.
Are there any other places where we encounter dangerously low levels of oxygen?
No. The atmosphere surrounding the Earth contains 20,9 % safe level.
Yes, in tropical forests.
Yes, flying at a height of 10 000 metres, pilots encounter oxygen levels at around 5 %.
What is the survival time when the oxygen level in the atmosphere is at 10 %?
Between 20 and 30 minutes.
Less than 45 minutes.
Around 1 hour.
What is the survival time when the oxygen level in the atmosphere is at 5 %?
Between 30 and 60 seconds.
1,5 minutes.
2 minutes.
How does our body obtain the required level of oxygen?
Body cells separate the oxygen from the air breathed in.
Body cells need a constant supply of oxygen which they get from the oxygen dissolved in the blood.
Oxygen enters the body and is distributed via body cells.
How important is the saturation level of oxygen in the body?
Very important. If it falls below 80 %, brain and organ failure begins.
Ideally it should be 100 % at all times.
Very important. In hospitals, the saturation level of oxygen in patients is measured by a clip on the finger.
All of the above.
What happens when someone enters an unchecked, low oxygen enclosed space?
They will lose consciousness and die.
Exhaustion will set in.
They will quickly start feeling dizzy.
How does one feel in an atmosphere low in oxygen?
Mounting chest pressure.
The same as being drowned or being strangled.
Tired.
Can we guess or estimate what the oxygen level is in an enclosed space?
Yes, we can smell the atmosphere after opening up.
Yes, we can look for signs of rusting or other decay.
No, the only way to ascertain the level is by accurate measuring.
Are only seafarers on board ship in danger of entering a low oxygen space?
Yes, there are no enclosed spaces on shore.
No, people on shore wear oxygen cylinders when entering enclosed spaces.
No, miners, mountaineers and high flying military pilots may also do so.
Why is oxygen so vital for us?
Our 30 trillion body cells use oxygen to maintain life.
Our cells obtain the oxygen they need from oxygen rich blood.
The amount of oxygen held in the blood is illustrated by its saturation level.
All of the above.
What is the first thing to be done before a rescue attempt is made?
The alarm must be raised.
The oxygen level in the enclosed space must be tested.
Emergency equipment that provides oxygen must be donned.
What are the dangers in attempting an unplanned rescue in enclosed spaces?
The ship's crew may not be aware of the emergency.
The rescuer will die.
There is a minimal chance of a successful rescue.
What are the key rules applicable to entering an enclosed space?
Do a risk assessment prior to entry.
Monitor the oxygen levels regularly during entry.
Maintain regular radio communication with the outside.
All of the above.

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Verified by
Vladimir Filatov
Vladimir Filatov
Chief Officer
About

Senior Mate with 12+ years of experience in the international merchant marine.

  • Development and implementation of navigation and on-board safety plans.
  • Supervising the work of the crew and assisting the captain in managing the vessel.
  • Participation in training of junior crew, ensuring compliance with safety standards.

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June, 26, 2026 15 0
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