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Home Online tests CBT All types of vessels Ch-Eng / 2nd-Eng Test Online about Engineering Operations in Cold Environments (CBT 0280) (CBT)
Online testing: Test Online about Engineering Operations in Cold Environments (CBT 0280) (CBT)
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According to the IMO’s Polar Classes, which ships can operate all year round in all ice covered waters?
Only those of Polar Class 1.
Only those classed as Ice-breakers.
Only those of Polar Class 4 or better.
Only those of Polar Class 7.
According to the IMO’s Polar Classes, which ships can operate in Second-year Ice? Pick the best answer.
Only those of Polar Class 3 or better.
Only those classed as Ice-breakers.
Only those of Polar Class 1.
Only those of Polar Class 7.
According to this module, what is the most common way of protecting the firemain in extreme cold weather?
Drain the firemain and leave exposed hydrants just cracked open.
Drain the firemain and then close all hydrants tightly.
Keep the firemain pressurised and allow water to flow through the anchor wash valves.
Keep the firemain pressurised with all valves closed.
According to this module, what type of construction is becoming popular on modern Ice Class vessels? Pick the best answer.
Simpler construction using heavier frames spaced further apart.
Using light frames and longitudinal stiffeners.
Using longitudinal girders and transverse stiffeners.
Using more frames spaced closer together.
According to this module, what type of major hull damage is most critical for vessels operating in the Arctic?
Frame buckling and tripping of frames against the side shell.
Damage caused by excessive bending stress.
Indentation of bottom plating.
Indentation of side plating.
According to this module, when the firemain is drained for extreme cold weather, where should the position of all valves on the firemain be recorded? Pick the best answer.
On the bridge, in the engine room and at the emergency headquarters.
In the engine room.
On the bridge and in the Chief Engineer’s cabin.
On the emergency fire plan and on the bridge.
First-year Ice can sometimes be recognised by its colour. Which one of these options is sometimes used to describe First-year Ice?
White ice.
Black ice.
Blue ice.
Green ice.
How effective is steam injection for clearing ice from sea suctions? Select the best answer.
Operational experience has shown that steam injection on its own cannot always clear ice.
It has been shown to be effective at clearing ice in nearly all circumstances.
It has been shown to have no effect.
It is highly effective, but too costly to be used regularly.
If a ship is not designed for operation in heavy ice, how should the propulsion machinery be designed? Pick the best answer.
To give the best efficiency in the areas it operates in for most of its service.
To give the best efficiency in open water.
To give the best efficiency in thin ice.
To give the maximum power to weight ratio.
If the vessel has to go astern in ice, what should be done with the rudder? Select the best answer.
It should be moved to mid-ships.
It should be moved from side to side to keep it free of ice.
It should be put hard over to help turn the vessel and break the ice.
The steering gear motors should be stopped to avoid excessive force on the rudder.
Should ships which are not Polar Class operate in polar waters? Pick the best answer.
Only if those waters can be confirmed as being ice free along the route.
No, never.
Only if there is nothing worse than First-year Ice confirmed along the route.
Only in the summer months.
Some propellers may be fitted inside a duct or nozzle. Select TWO of the following statements about this that you think are true.
This helps protect propellers when in ice.
This increases the available thrust.
This can only be done with controllable pitch propellers.
This can only be done with fixed pitch propellers.
Answer
What are the advantages of supplying a diesel engine with air through its own ducting on a vessel operating in very cold weather? Pick the best TWO answers.
It helps avoid making the machinery spaces too cold.
It makes it easier to pre-heat the air.
It means a higher air pressure can be delivered to the engine.
The air supply can be regulated using a flap valve.
Answer
What are the reasons for fitting an exhaust gas bypass for the main engine turbocharger on a vessel operating in very cold weather? Pick the best TWO answers.
It allows more heat to be recovered from the exhaust gas.
It helps prevent overpressure in the cylinders.
It allows the engine to be operated without the turbocharger.
It protects the turbocharger from overpressure.
Answer
What precaution should be taken for the deck seal of an inert gas system in extreme cold weather? Pick the best answer.
Make sure the deck seal heating coil is in use and working.
Close the deck isolating valve.
Ensure a flow of warm inert gas through the seal at all times.
Isolate the deck seal.
When operating in ice, what is the best draught to be at to avoid problems? Select the best answer.
The deepest draught practical.
The draught that allows the propeller to break up ice on the surface.
The draught that allows the rudder to break up the ice sheet.
The shallowest draught practical.
When operating in ice, which sea suctions should be used? Select the best answer.
Use low sea suctions.
Keep all sea suctions open.
Sea suctions should be changed over each day.
Use high sea suctions.
When sailing in ice, what is the best draught to use? Pick the best answer.
Operate at a deep draught, to help protect the rudder and propellers and keep sea suctions free of ice.
Operate at shallow draught and trim by the stern to help the bulbous bow cut through the ice.
Operate at shallow draught but trim by the head to help the bulbous bow cut through the ice.
Operate at shallow draught to reduce the force required to move through the ice.
Which Annexes of MARPOL designate North American sea areas as a Special Area? Select any you think apply.
Annex VI (Air Pollution).
Annex I (Oil).
Annex IV (Sewage).
Annex V (Garbage).
Which Annexes of MARPOL designate the Baltic as a Special Area? Select any you think apply.
Annex I (Oil).
Annex IV (Sewage).
Annex V (Garbage).
Annex VI (Air Pollution).
Answer
Which Annexes of MARPOL have special requirements for the Antarctic Area? Select any you think apply.
Annex I (Oil).
Annex II (Noxious liquid substances).
Annex V (Garbage).
Annex VI (Air Pollution).
Answer
Which THREE of these are advantages of a controllable pitch propeller for operations in ice?
Pitch can be reduced to avoid overloading the engine.
The direction of thrust can be changed more quickly and easily.
The propeller can continue to turn when the vessel is stopped.
The efficiency at service speed is increased.
Answer
Which TWO of the following are advantages of electrical propulsion for vessels operating in ice?
High torque at low speeds.
Improved redundancy.
Lower fuel costs at maximum service speed.
Lower installation costs.
Answer
Which TWO of these statements about brittle fracture are true?
Brittle fracture can be caused by shock loading, such as when a vessel is moving through ice.
Brittle fracture is more likely at low temperature and usually occurs suddenly and without warning.
Brittle fracture occurs gradually.
Brittle fracture of the hull in ice usually occurs below the water-line.
Answer
Which items of repair equipment do the IMO recommend that all icebreakers and ships of Polar Class 1 to 5 should carry? Select TWO answers.
A portable submersible pump of 100 tonnes/hour capacity, with a set of hoses.
Portable gas welding and cutting equipment with a reserve of gas and consumables.
A portable electric arc welding set and spare electrodes.
Spare I-section girders for temporary hull repairs.
Answer
Which of these is a possible diesel engine problem caused by low air temperature? Pick the best TWO answers.
The fuel will not ignite in the cylinder.
The pressure in the cylinder may become excessive.
More air needs to be supplied to the engine.
There will be excessive condensation at the charge air cooler.
Answer
Which one of these has been found to be the most effective method of keeping sea suctions clear of ice?
Use of a sea bay and recirculation of the heated cooling water back to the suction.
Compressed air and duplex filter arrangements.
Sailing at deep draught and keeping air or steam on the sea suctions.
Steam injection and duplex filter arrangements.
Which one of these is an IMO recommendation for the lubrication of stern tube bearings used in polar regions?
That stern tube systems should not leak pollutants into the sea.
That only fresh water lubricated stern tubes should be used.
That only oil lubricated stern tubes should be used.
That only sea water lubricated stern tubes should be used.
Which one of these is the best way for most vessels to get through ice?
Keep moving and avoid heavy ice even if it means taking a longer route.
Continually steer to port then starboard.
Move at high speed and use the momentum of the ship to break the ice.
Take the shortest possible route through the ice.
Which part of a ship’s hull experiences the highest loads when sailing through ice?
The bow.
An area just forward of mid-ships.
The bottom plating.
The side shell plating.
Why are frozen ballast and fuel tank vent pipes a danger? Select the best answer.
Because they can cause the tank to be over pressurised when filling or a vacuum to form when emptying and the tanks may rupture.
It makes it harder to get an accurate sounding.
It makes it harder to pump fluid into the tanks.
It makes it harder to see when the tank is overflowing.
Why do IMO guidelines say that ballast water to be discharged in the Antarctic should be exchanged outside of the region? Select the best answer.
Because of damage to the environment caused by invasive species and sediments.
Because of stability concerns.
So that the vessel remains low in the water at all times.
To avoid sea suctions becoming blocked.
Why is it important to be able to tell Old Ice from Young Ice? Pick the best answer.
Both types can cause hull damage, but Old Ice is thicker and therefore the risk of hull damage increases.
Young Ice is an early warning for Old Ice.
Young Ice is not thick enough to cause hull damage, whilst Old Ice can.
Young Ice is thicker and therefore the risk of hull damage increases.
Why is it recommended that fresh water ballast is replaced with sea water before entering extremely cold weather? Select the best answer.
Because fresh water is more likely to freeze than sea water.
Because it reduces corrosion in part filled tanks.
Because most cold weather regions have strict environmental controls.
Because sea water will give more weight for the same volume.
Why should oils be stored at temperatures above their pour point? Select the best answer.
So that they can be pumped.
So that they can be purified.
To prevent filters becoming blocked with wax.
To prevent vapours from being given off.
Тест проверяет знания об особенностях эксплуатации судового оборудования в условиях низких температур. Вопросы охватывают методы защиты механизмов, действия по предотвращению обледенения и аварийное обслуживание оборудования в холодных условиях.
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