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Home Online tests CBT Oil tanker MASTER / Ch-Officer Test for seamans about Development of Heavy Weather (CBT)
Online testing: Test for seamans about Development of Heavy Weather (CBT)
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The test consists of 80 random questions.
Total questions on this topic: 86
Total questions on this topic: 86
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Which of the given options best describes a cross swell in relation to sea state?
Two swells from different directions meeting at a large angle.
Two swells meeting from opposite directions.
Two swell meeting from the same direction.
A swell found off the island of Malta.
Select the option which correctly completes the following statement. “The Beaufort scale is used to”:
Indicate wind strength.
Measure the pressure value in a depression.
Give some indication of swell height.
Describe the types of cloud cover.
Which of the given options completes the following statement? A vessel stationary in a harbour on the crest of a standing wave will:
Heave only.
Heave and roll.
Not move at all.
Roll only.
Select from the given options a physical definition of a rogue wave:
A wave that has height greater than twice the significant wave height.
One that was not seen but upset the vessel.
A wave that has a length greater than twice the length of the other waves.
A wave found only off the South African coast.
Indicate from given options the definition of phase wave period in relation to sea waves:
The time for two successive crests to pass a fixed point.
The time it takes for the wave to travel one mile.
The way that the wave moves relative to the vessel.
The time it takes a crest to pass the vessel.
Which of the given options is the most accurate in relation to the following statement? Synchronous rolling only occurs with beam seas:
It is not correct as quartering seas can produce the same affect.
It is not correct as head waves can produce it.
It is correct because a beam seas is needed to start rolling.
It is correct as a beam sea is always of the correct characteristic to start it.
In temperature latitudes which pressure system is associated with strong wind? Select an option best answering the question:
Low pressure system or cyclone.
High pressure system of great intensity.
Localised winds off the land.
Cols or areas of equal pressure in between low pressure centres.
Select from the given options one of the environmental definitions of heavy weather used in this module:
When the wind strength exceeds force 7 on the Beaufort scale.
When the vessel starts to move in a seaway.
When the wind strength exceeds force 4 on the Beaufort scale.
When the Navtex indicates it with a message from the weather centre.
Select the option which correctly completes the following statement. “A Beaufort wind force 10 will have a velocity of”:
48-55 knots.
Greater than 64 knots.
22-27 knots.
34-40 knots.
Which of the given options can be considered the most accurate for this statement? The position of the centre of water pressure will affect how the vessel handles when being berthed:
A correct statement – as a berthing vessel usually has force from moving water on it.
A correct statement – as a berthing vessel uses the centre of pressure to push on the berth fenders.
An incorrect statement – as a berthing vessel is not affected by moving water.
A correct statement – as a berthing vessel is under tug control at all times.
Select the option that completes the following statement. “If the wind speed doubles”:
The force on the vessel increases by an approximate factor of four.
The force on the vessel will also double.
The force on the vessel increases by only a small amount.
The force on the vessel increases by an approximate factor of five.
Which of the given options best describes wind against tide effect?
Wind blowing in an opposite direction to water flow.
Wind blowing in the same direction as water flow.
Where the wind causes a build up of water increasing the tide height.
Where the wind causes a drop of water height.
Which of the given options can be considered correct to complete this statement? The bow of an aft accommodation vessel with wind on the beam when moving ahead:
Will probably seek the wind.
Will probably pay off downwind.
Will not be affected by the wind.
Will be difficult to control.
Which of the given options best describes when a large vessel will start rolling in waves?
When the encounter angle is near the beam and waves have sufficient force.
If the transverse GM is large and there are waves present.
As soon as any waves hit the vessel’s hull.
When there is a wind above Beaufort force 4.
Which of the given options is the most accurately completes the following statement? The transverse GM of the vessel:
Has an influence on a vessel rolling in waves.
Has no influence on a vessel rolling in waves.
Has an influence on a vessel pitching in waves.
Has no influence on a vessel pitching in waves.
Select the option which correctly completes the following statement. “Very large waves can be destructive because they have”:
Lots of energy.
Steep sides.
Long wave length.
Short wave length.
Which of the given options best describes the motion of water particles in a deep water wave?
They have an orbital motion.
They do not move at all.
They move vertically only.
They move horizontally only.
Which of the given options best completes the following statement? Water breaking over the bow of a large vessel with aft accommodation:
May be causing damage not seen immediately by the crew.
Is acceptable in heavy weather as the vessel will be at high speed.
Looks impressive from aft bridge.
Will not impact on the vessel.
Which of the given options best completes the following statement? The wavelength of a wave is the distance from:
One wave crest to the next wave crest.
The crest of a wave to the trough.
The crest of a wave to the mid value.
The trough of a wave to the crest of the wave horizontally.
“When there is moving water on the deck from breaking waves the force it generates will be insufficient to knock a person over?” Select the best option that comments on this statement:
The statement is incorrect as the force may be sufficient to knock a person over.
The statement is correct as the person’s weight will hold him/her upright.
The statement is incorrect as people will not be on deck with moving water present.
The statement is correct when the person wears boots.
Which of the given options can be considered the best answer to a definition of the dangerous semi circle in a Tropical Revolving Storm (TRS)?
It is the semicircle where the wind is in the same direction as the TRS movement.
It is the semicircle where the wind is in the opposite direction to the TRS movement.
It is the northern half of the TRS.
It is the southern half of the TRS.
Select the option which correctly completes the following statement. “A Beaufort wind force 10 will have associated deep water waves of average height”:
9 metres.
Greater than 14 metres.
2-4 metres.
5,5 metres.
Which of the given options is the most accurately completes the following statement? A category 5 hurricane on the Saffir-Simpson scale is:
A severe tropical storm.
One of the lightest tropical storm.
A moderate tropical cyclone.
A down grading code for a tropical cyclones to a depression.
Select an option that best answers the following question. In low equatorial latitudes which pressure system is associated with extremely strong wind?
A tropical revolving storm.
The Azores High pressure system.
Anabatic and katabatic winds.
The weather associated with the doldrums.
Is the following statement true or false? “Tropical depressions can move across the equator”.
True.
False.
Which of the given options correctly describes a vessel being pooped?
When a wave breaks on the stern of a vessel.
When waves break over the vessel’s side.
A condition that exists with the engine after a long sea passage.
When a vessel has water breaking over the bow.
Which of the given options correctly describes a standing wave at sea?
One that moves in the same direction and speed as the vessel.
When the vessel runs down waves at a faster speed than the waves.
When the vessel runs down waves at a slower speed than the waves.
One that has a steady wave height.
Which of the given options correctly identifies the speed of a deep water sea waves of 150 metres length and period 10 seconds?
Approximately 30 knots in deep water.
Approximately 10 knots in deep water.
Approximately 100 knots in deep water.
It cannot be calculated because it is a function of wave amplitude.
Which of the given options best describes the speed of swell waves?
Long wavelength swell travels faster than short wavelength.
Short wavelength swell travels faster than long wavelength.
They travel faster in shallow water.
They are very slow compared to wind waves.
Which of the given options best completes the following statement? A high pressure centre will:
Temporarily depress the sea surface.
Temporarily raise the sea surface.
Have no effect on the sea surface.
Affect the tide raising forces.
Which of the given options best describes significant wave height in relation to sea waves?
The mean height of the third largest waves.
The wave that causes most damage.
The mean height of all waves.
The height of a wave measured from crest trough.
Which of the following statements best explains why some vessels cope with heavy weather better than others?
Heavy weather effects can be relative to the vessel.
Some vessels do not react to wind as much as others.
Some vessels have better reserve stability than others.
It is totally dependent on the hull shape.
Which of the given options best describes the motion of water particles in a shallow water wave?
They move horizontally only.
They do not move at all.
They move vertically only.
They move horizontally and vertically.
Which of the given options is correct for the following statement? Storms causing heavy weather conditions occur seasonally:
The statement is part correct – it depends upon location.
The statement is correct as storms always happen in winter.
The statement is only correct for the North Atlantic.
The statement is only correct for the South Atlantic.
Which of the given options is correct for the following question? If the wind force on a vessel is calculated to be 50 tonnes how many 50 tonne tugs will be required with 25 % redundancy to overcome the wind force:
A minimum of two tugs.
One 50 tonne tug is sufficient.
A minimum of three tugs.
A minimum of four tugs.
Which of the given options correctly describes a standing wave in harbour?
One that has vertical movement only.
One that has horizontal movement only.
Sea waves entering a harbour.
One that has both vertical and horizontal movement.
Which of the following options best completes the following statement: “With waves ahead a vessel with a very fine bow will”:
Cut through the waves relatively easily.
Pitch heavily on meeting the waves.
Be very dry on deck forward.
Be badly affected in heavy weather.
Which of the given options can be considered a definition of fetch?
The distance which the wind has been blowing over the sea surface.
The distance over the land surface which the wind has been blowing.
The time the wind has been blowing.
The size of the depression causing the wind to blow.
Select from the given options the statement that best describes when wind force is at a maximum value on a normal vessel:
When the wind is abeam or close to the beam.
When the wind is ahead and the vessel is moving.
When the wind is astern and the vessel is moving.
When the wind is gusting up and down.
Which of the given options best describes the location of the world’s Tropical Revolving Storms?
In lower latitudes across all ocean.
In lower latitudes close to the equator.
In temperature latitudes only.
In the western Pacific only.
Which of the given options can be considered correct for the time when a large vessel starts to feel the bottom and have increased drag?
When the depth becomes less than six times the draught.
When the depth is less than ten times the draught.
When the depth of water is 1,2 times the draught.
When the under keel clearance is very big.
Which of the given options best describes what happens to a wave entering shallow water?
It feels the bottom and it’s characteristics change.
It immediately starts to break.
The wave speeds up causing the sea to flatten.
Nothing happens to the wave but the bottom gets eroded.
Which of the given options is the most accurately completes the following statement? Water on deck of a vessel:
Can increase top weight reducing the vessel’s stability.
Has no affect on the vessel’s stability.
Tends to stay there till the vessel next rolls.
Will temporarily increase the vessels stability.
Which of the given options is correct for the following statement? Slamming is an acceptable part of being in big waves:
The statement is not correct as slamming can cause major damage.
The statement is correct as slamming happens away from the crew accommodation.
The statement is not correct as slamming is noisy keeping the crew awake at nights.
The statement is correct as vessels are built to withstand slamming.
Which of the given options best describes parametric rolling on a vessel?
Very heavy rolling when ahead or astern waves are encountered.
Very heavy rolling in a beam sea on a container vessel.
Very heavy rolling on a container vessel because of the deck cargo.
It is type of rolling that only tankers and bulk carriers suffer from.
Select from the given options one definition of heavy weather given in this module:
When the wave height exceeds 4 metres.
When the vessel starts to roll.
When the wave height exceeds 2 metres.
When the vessel is in high pressure weather system.
Which of the given options best describes a katabatic wind?
A wind that blows from the land towards the sea.
A wind that blows towards land from the sea.
A wind found only in USA.
A wind localised to desert areas.
Which of the given options best describes synchronous rolling on a vessel?
When the natural roll period of the vessel is the same as the wave period.
When the natural roll period of the vessel is twice the wave period.
It is the motion that occurs when there are very long wavelength gravity waves.
It is a type of rolling that only container ships suffer from.
Which of the given options is the most accurate in relation to the following statement? A vessel when sailing deep sea may not notice a Tsunami wave passing:
Because of the wave characteristics.
As it is a large wave and will always be seen.
Because the wavelength is very short.
As there will be violent motion on the vessel as it passes.
Which of the given options best completes the following statement? A low pressure centre will:
Temporarily raise the sea surface.
Temporarily depress the sea surface.
Have no effect on the sea surface.
Affect the tide raising forces.
Which of the given options correctly describes why fin stabilisers are sometimes not as effective in heavy weather as in calmer conditions?
If the vessels slows down lift from the fin is reduced.
There is no difference in their effectiveness in heavy or calm conditions.
In heavy weather they turn more slowly to reduce inertial loads.
The varying depth of water in waves means they work differently to each other.
Which of the given options best describes a Tsunami sea wave?
A long wavelength wave caused by an earthquake.
A very short wavelength wave caused by an earthquake.
A wave found in the South Pacific only.
A seismic wave in the earth.
Select from the given options the statement that best describes how much water force there can be on a vessel compared to wind force:
Water force can be considerably more than wind force on some vessels.
Water force and wind force are usually about the same.
Water force is usually considerably less than wind force on most vessels.
Water force is usually fairly small on a vessel and can be ignored.
Which of the given options best describes swell waves found at sea?
Waves resulting from previous wind or wind in another area.
Waves caused by winds in the same area as the swell is sighted.
Waves from an American registered vessel’s hull.
Waves bigger than sea waves.
Is the following statement true or false? “Waves feel the bottom when the depth of water is greater than half the wavelength of the deep water wave”.
True.
False.
Which of the given options best describes a tidal storm surge?
Raising or lowering of the predicted tide height.
Raising of the predicted tide height.
Lowering of the predicted tide height.
A sudden increase in the severity of the weather.
Which of the following options best completes the following statement: “A seiche is”:
The oscillation of water in a harbour.
A wave seen in the tropics from earthquake activity.
A type of wind blowing in Antarctic areas.
The oscillation of water in an ocean.
Which of the given options correctly describes a vessel broaching?
An uncontrolled manoeuvre putting the vessel beam on to waves.
A controlled turn in heavy weather to heave to.
A manoeuvre executed by the Master with manual steering engaged.
Movement similar to parametric rolling that happens on container vessels.
When manoeuvring a vessel in a shallow water tidal area with tugs where should the tugs be positioned? Select the best option:
In positions to control the water forces.
Where ever the Pilot chooses.
In positions to suit the berth.
Centre leads fore and aft.
Select FOUR of the given options which lead to a build up of very large waves:
Answer
Which of the given options best describes why a vessel may be rolling or pitching when there is no wind?
The vessel is suffering swell waves.
Cargo is moving on board the vessel.
The wind is gusting up and down in speed.
The vessel’s stability is suspect.
Which of the given options completes the following statement? On a large container vessel in heavy weather with waves ahead slowing down may:
Increase the likelihood of parametric rolling.
Not make any difference to the ETA next port.
Increase the likelihood of being pooped.
Increase the likelihood of being broached.
Which of the given options best describes an anabatic wind?
A wind that blows towards land from the sea.
A wind that blows from the land over the sea.
A wind found only in Indonesia.
A wind localised to arctic areas.
Select the option which correctly completes the following statement. “The group wave period of a deep water wave explains why”:
There are bigger and smaller waves in the same wave train.
There is a long time between crests.
There are only swell waves visible.
There are only wind waves visible.
Which of the given options can be considered a definition of temperature latitudes?
Latitudes between 30 and 70 degrees north and south.
Latitudes between 30 and 70 degrees only in northern hemisphere.
Latitudes between 30 and 70 degrees only in southern hemisphere.
Lattitudes between 0 and 30 degrees close to the equator.
Which of the given options is the most accurate in relation to the following statement? Very large waves can be encountered in any sea area regardless of environmental conditions:
Not correct – as environmental conditions have to be right.
Not correct – they are only seen in high latitudes.
Correct – they can occur with or without wind blowing.
Correct – they will always be there because of the group velocity of waves.
Is the following statement true or false? “A rogue wave is usually very steep fronted”.
True.
False.
Select from the given options the best definition of a vessel slamming:
The bow re-entering the water when the vessel is pitching.
The sound that occurs when the vessel has water breaking on deck.
The sound of unhooked doors opening and closing due to violent motion in heavy weather.
The bow being affected by the orbital motion in a wave.
Which of the given options best describes the direction of wind circulation in a tropical storm in the northern hemisphere?
Anti clockwise when viewed from above.
Clockwise when viewed from above.
Clockwise then anticlockwise when crossing the equator.
Anticlockwise then clockwise when crossing the equator.
Select the option which correctly completes the following statement. “The strongest winds in a temperature latitude depression often occur”:
Behind the cold front.
In advance of the warm front.
In the warm sector.
In advance of the cold front.
Which of the given options correctly describes what happens to a vessel’s stability in heavy weather?
Passing waves cause increases and decreases in the vessel’s transverse GM.
Passing waves cause the vessel’s longitudinal GM to change.
Water on deck increases the vessel’s GM values.
There is no change in the vessel’s stability in waves.
Select from the given options the statement that best describes water force on a vessel:
The force is made up form drag and skin friction.
The force comes only from air drag as the vessel moves through the water.
The force comes only from friction found on the hull surface.
The force is not of great concern with a vessel in a harbour.
Which of the given options is the most accurate in relation to a rogue wave?
There will often be a large trough before the wave front.
It will be proceeded by a flat bit of sea.
There will be a flat bit of sea behind the wave.
The wave height is similar to surrounding waves.
Which of the given options can be considered correct to complete this statement? Breaking water on the deck of a vessel:
Can impose enormous loads on deck and deck machinery.
Looks impressive as the spray flies.
Is not a major issue as vessels are built to withstand it.
Can be seen as acceptable with a vessel at high speed.
Select from the following options why very large waves build up in the sea:
It is because all required environment factors are present.
It is only because there is a strong wind.
It is only because of wind against tide effect.
It is only because there is a large fetch.
Which of the given options best describes the direction of wind circulation in a tropical storm in the southern hemisphere?
Clockwise when viewed from above.
Anticlockwise when viewed from above.
Clockwise then anticlockwise when crossing the equator.
Anticlockwise then clockwise when crossing the equator.
Select from the given options the one which best completes the following statement: “With a small under keel clearance water force can be”:
Up to four times the deep water value.
Up to six times the deep water value.
The same as the deep water value.
Less than the deep water value.
Select the option which correctly completes the following statement. “Wind waves are classed as gravity waves because”:
Gravity is the restoring force when wind stops.
Gravity causes vertical motion of particles in the wave.
They suffer the effects of gravity making them bigger than the wind would indicate.
Their wave height is bigger than 4 meters.
Is the following statement true or false? “Some areas of the world are more prone to heavy weather than others”.
True.
False.
Which of the given options completes the following statement? There is a risk of parametric rolling if:
The natural roll period is twice the wave encounter period.
The natural roll period is half the wave encounter period.
A vessel puts the waves on the beam.
The natural roll period is the same as the wave encounter period.
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