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Heim Online-Tests CES Chemical tanker MASTER / Ch-Officer Test online CES 5.1 for MASTER / Ch-Officer, Chemical tanker vessel
Online-Test: Test online CES 5.1 for MASTER / Ch-Officer, Chemical tanker vessel
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Which one of the listed requirements regarding the stowage of a survival craft corresponds to present SOLAS regulations? Each survival craft shall *be stowed:
On the starboard side of the ship
In a state of readiness so that two crew-members can prepare for embarkation and launching in less than 15 minutes
In a secure and sheltered position and protected from damage by fire or explosion
Wherever space is available
Which one of the following is a limitation on the use of chemical powders?
In some cases they may cause a violent reaction on combustible metals such as sodium
Some of them may give off NH3
All the below mentioned alternatives
They may put an insulating deposit on electronic equipment
*Which of the following measures should be applied when hot work is to be undertaken in a harbour.
All the answers are good
To maintain a permanent fire watch of at least four persons
To have a hot-work permit
To use only intrinsically safe equipment in the area where hot-work is performed
What is the minimum number of fireman's outfits that should be carried on a cargo ship?
4
3
1
2
*What is the minimum capacity "c" of the emergency fire pump ?
c not less than 40%C total main, but in any case not less than 250 m3/h
c not less than 20%C total main, but in any case not less than 250 m3/hNOTE: "C total main" is the total capacity of the main fire pumps of the ship
c not less than 40%C total main, but in any case not less than 25 m3/h
c not less than 20%C total main, but in any case not less than 25 m3/h
Which one of the listed fire-extinguishing medium is to be preferred to fight a fire in an electric installation (for example the main switchboard)?
Powder.
Foam.
Water fog.
Sprinkler.
Instructions for "Preparation for welding or hot work in cargo tanks" is laid down by the Norwegian Maritime Directorate. During ongoing inspection on work in cargo tanks, the gas concentration shall be measured:
At two levels for three places in the tank.
At three levels at one point close to the working area.
At one level for at least two places in the tank.
At three levels for at least two places in the tank.
The identification of a coast station is composed as follows:
00 followed by an MMSI-number
00 followed by an MID-number and a station number
00 followed by an MID-number
Don't know
What information has to be given to set up a radio telex-connection with a coast-station:
ARQ followed by the coast-station's ID-number
Don't know
FEC followed by the telex country-code of the coast-station
ARQ followed by the call sign of the coast-station
A message is sent to a fax-machine. However the message cannot be delivered by the land earth station. The land earth station will:
Don't know
never send a non-delivery notification (NDN) if a fax message to the sender. The sender to verify if the message was received
automatically send a non-delivery notification (NDN) to the sender
will only send a non-delivery notification (NDN) to the sender if so requested by him
An Inmarsat-C terminal is suitable for:
telephony, telex, fax and data
store & forward messages
Don't know
telephony, fax and data
Which class of emission is used for ARQ NBDP transmissions ?
F1B
G2B
J3E
G3E
Which of the following INMARSAT services provides communications by telephone, telex, facsimile (f, and data?
INMARSAT-A.
Safety NET.
VHF-FM.
INMARSAT-C.
The accuracy of the position of a Cospas-Sarsat EPIRB established / determined by a LUT is:
100 meters
20 miles
Don't know
5 miles
The battery of an EPIRB should be changed
Every two years
Every four years
Every three years
Yearly
Which type of call will be sent by a ship in danger of capsizing and needing assistance from all vessels in her vicinity ?
Distress call
Urgent call
Safety call
Distress relay call
The charge of a message sent by the Inmarsat-C installation must be calculated. The size of the message is 4096 bits. The charges for the message sent is 0,17 SDR per unit. The total charge for the message is:
4096 times 0.17 SDR
4.096 times 0.17 SDR
40.96 times 0.17 SDR
16 times 0.17 SDR
Watch keeping engineers shall have a minimum of knowledge of the vessel's engine room and operation of its functions prior to being accepted as Engineer on Duty, and shall acknowledge his familiarization with the equipment by signing a check list listing all units he shall be able to operate. Minimum knowledge is:
Start, operate and stop main and auxiliary machinery units, including switching between automatic, remote and/or manual control functions, and operate the various units in various modes.
Check routines during operation and prior to switching to UMS-mode
Understand the function of all main and auxiliary equipment, e.g. machinery, pumps, fuel systems, cooling systems and the interlinks between various units and the function of them.
He shall have all the knowledge as listed in the other alternatives
For how long is the health certificate valid for a seafarer in foreign trade?
No time limit.
Two years.
One year.
Three months.
What will you serve seafarers who has been exposed to cold?
Fruit and vegetables only.
Pork and fat fish.
Warm nutritious drinks.
Brandy, whiskey or other strong drinks.
What is the most probable place that any oil will flow over the ship's side in case of an overflow during loading/discharging?
Near the sounding pipe of the tank being loaded/discharged
Near the hatch of the tank being loaded/discharged
Near the cargo manifold
Aft part of the tank-deck
Small oil spills on deck can be kept from going overboard by doing what?
Plugging the scuppers
Closing the lids on the vents
Plugging the sounding pipes
Driving wooden plugs into the vents
You are the Sen.Off.Deck on vessel "A" and you have been involved in collision with vessel "B". Your cargo is fuel oil. The oil cargo is leaking out and the weather condition is good. What will you do to avoid the oil to reach and pollute the coast line?
By throwing chemicals on the water.
By putting the vessel mooring ropes as an oil boom around the vessel and the oil slick.
Asking any other vessel for immediately help.
By doing nothing and hope that the current will move the oil slick into the open sea.
Give the meaning of the following symbol
A class fire door
A class door self closing
B class fire door self closing
B class fire door
Your vessel is going alongside. One tug will assist at the mooring. How do you want to use the tug and at which position?
Pushing at vessel's flat side where it is needed
Make fast forward to pull when needed
Make fast aft to pull when needed
Make fast on the vessel's shoulder to push and pull
What is the most dangerous overtaking situation shown on the sketches?
A large vessel overtaking a small vessel with a big difference in speed between the two vessels.
A small vessel overtaking a large vessel with a big difference in speed between the two vessels.
A small vessel overtaking a large vessel with little difference in speed between the two vessels.
A large vessel overtaking a small vessel with little difference in speed between the two vessels.
Your vessel is moving in Panama Canal waters. When must a crew man capable of and ready to operate the anchors be on the forecastle?
When passing through the Gatun Lake
When passing through Gaillard cut
When anchoring in Gatun Lake only
When a Panama Canal pilot is onboard
If the OOW must leave the voyage plan, he should?
Inform the master
Check the new plan
No special action necessary
Make a note in the log book
In which waters are piracy attacks most frequent?
Open sea
Malaysian waters
Indonesian waters
Brazilian waters
Sea area A3 is in maritime radio traffic a sea area:
With the exception of the areas A1 and A2 within the range of a geostationary satellite of Inmarsat in which an uninterupted alerting is possible
With the exception of the sea areas A1 and A2, in which a reliable HF connections exist by DSC with one or more coast radio stations
Where communication is not possisble
From about 200 miles from shore a reliable DSC connection exists with one or more coastal stations
An area A1 is:
an area within the radiotelephone coverage of at least one VHF coast station in which a continuous watch on channel 16 is available
an area which extend to 10 nautical miles from the coast stations
an area within sight of a MRCC
an area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available
If a ship according to the rules of GMDSS is equipped with an MF/HF radio set a DSC listening watch must be kept on:
2187.5 kHz, 8414.5 kHz and for instance 12577.0 kHz
8414.5 kHz and on at least one of the following DSC frequencies: 4207.5 kHz, 6312.0 kHz, 12577.0 kHz or 16804.5 kHz
Don't know
all DSC distress frequencies
Which one of the given requirements regarding survival craft muster and embarkation arrangements corresponds to the present SOLAS regulations?
Muster and embarkation stations shall be readily accessible from accommondation and work areas.
Searchlights to be provided at the launching station.
Davit-launched survival craft muster and embarkation stations shall not be arranged to enable stretchers to be placed in survival craft.
Muster and embarkation stations are to be arranged separately to improve working conditions.
How should the hook be released from a davit lowered liferaft?
Cut the weak link on the wire with the axe provided
Wait until the raft is waterborne, then pull the lanyard
Just prior to reaching the water, the lanyard should be pulled. This sets the hook which will automatically release once the raft is waterborne
Unscrew the shackle pin
*Which one of the following items has to be included in an abandon ship drill?
Manoeuvring the lifeboat in the water
operation of davits used for launching liferafts
Starting and operating radio life-saving appliances
Launching and recovery of a survival craft
When fighting fire, why shall you never pour water into hot fat?
The water will explode into steam causing hot fat to be thrown far away thus possibly causing severe burns or fire.
The water will turn into steam and cause the fat to explode.
The fat will not be edible any more.
The fat will stiffen immediately and need reheating.
Sometimes, in order to improve suction to the pumps when discharging "light" or "gassing" cargoes, the tanks are pressurised by admission of inert gas under overpressure from the inert gas fans. In this respect one must remember that tanks are generally dimensioned to withstand a vapour pressure of:
4000 mm wg?
1200 mm wg?
2500 mm wg?
3200 mm wg?
What is the purpose of pressure-vacuum relief valves?
Maintaining constant velocity in cargo lines
Regulation of discharge pressure from cargo pumps
To maintain a tank at atmospheric or overpressure.
Regulation of suction head on cargo pumps
Which electronic component does this graphical symbol represent?
Diode
Transistor
Silicon controlled rectifier
Tunnel diode
A bulk cargo vessel is found to be 4.0 centimetres over her maximum loadline draft after loading; what should be the actions of the master?
Record a lower draught and sail
There is not a problem as over loading is permitted
Order the pumping out of fresh water or ballast until the maximum allowed loadline is achieved.
Inform the port authorities and sail
What is the correct name of the part highlighted in the sketch?
Cylinder head
Air inlet valve
Exhaust valve
Cylinder relief valve
What is the function of a sacrificial exchangeable wear plate?
It protects hull plating around the bulbous bow
It protects the hull plating around cell guides
It protects twistlocks against wear down beyond a certain limit
It protects hull plating around the stern frame
At what number of crew members is it mandatory to have an Working Environment Committee on board?
Minimum four crew members.
Not mandatory.
Minimum eight crew members.
Minimum twelve crew members.
What is the description for a sidelight, as shown in rule 21 of the International Regulations for Preventing Collisions at Sea?
A green light on the starboard side and red light on the port side, showing an unbroken light over an arc of 135 degrees, from right ahead to 22.5 degrees abaft the beam on the respective side.
A green light on the starboard side and red light on the port side, showing an unbroken light over an arc of 112.5 degree, from right ahead to 22.5 degrees abaft the beam on the respective side.
A red, green or yellow lantern, showing an unbroken light over an arc of 112.5 degrees.
A red light or a green light, with a minimum range, in a vessel of 50 metres or more, of 3 miles. In a vessel of 10 metres or more but less than 50 metres in length, a range of 1 mile.
Which of the following is the definition of "Segregated Ballast Tanks", as found on oil tankers?
Cargo tanks which each have their own individual pumps, are fitted with independent piping systems and are served by unconnected ventilation arrangements
Tanks which are completely separate from cargo or fuel oil systems, being permanently allocated to the carriage of ballast and fitted with their own pumps and associated piping
Cargo tanks which may be used for ballast, where the lines are not connected to the Oil Discharge Monitoring Equipment
Cargo tanks which may be used for the carriage of ballast
What are the main elements in a damage control plan?
Instructions and procedures for reporting damage to the Company
Boundaries of the watertight compartments for decks and holds. Position of controls for opening and closing of watertight compartments. Arrangement for correction of list due to flooding.
Arrangements for correction of list due to flooding within 15 minutes
A damage control plan is the same as an emergency plan
What is the correct name of the part highlighted in the sketch?
Fuel injector
Air inlet valve
Exhaust valve
Air starting valve
How would you determine whether a particular cargo transfer hose was compatible with the chemical product to be transferred?
Refer to the product entry in the hose manufacturer's chemical resistance chart.
Check the product classification mark stamped on the flange collar of the hose.
Check the colour of the hose against the general classification code in the IBC Code.
There will be no need to check. If the hose has been supplied to a chemical tanker, it will have been certified for the transfer of all chemical products.
Which of the following letter combinations represents a level indicating controller on a process and instrumentation diagramv
CIL
LIR
CIR
LIC
There are certain cargoes which are extremely sensitive to moisture in the atmosphere. How are they commonly protected when shipped on chemical tankers?
By heating the cargo above the temperature of the outside air.
By filling the tank with inert gas before loading.
By continuously ventilating the ullage space above the cargo in the tank.
By the application of a nitrogen blanket (pad) above the cargo in the tank.
When carrying high sulphur coal which areas of a cargo hold are prone to corrosion?
Steelwork with which dry cargo is in contact
Air and sounding pipes passing through the hold
Steelwork with which wet cargo is in contact
All steelwork
How is the prime mover load normally kept to a minimum when starting up an electric driven reciprocating type air compressor?
By using an unloading device to keep the compressor delivery valves open until the machine is up to speed.
By using an unloading device to keep the compressor suction valves open until the machine is up to speed.
By keeping the second stage drain valve open until the machine is up to speed.
By keeping the main discharge valve closed until the machine is up to speed.
What are the requirements for the number of portable gas measurement instrument(s) on tankers?
At least one instrument for measuring %LEL and one instrument for measuring volume %
Sufficient number of instruments.
At least 2 portable instruments for measuring flammable vapours.
At least 1 portable instrument for measuring flammable vapours.
When checking the closed butt gap clearance of new piston rings prior to fitting onto the piston it is normal to try the rings in the liner so that the gap can be measured. From the options given select the best part of the liner to use to carry out these checks.
Near mid-height of the liner.
Near the bottom of the liner.
Near the top of the liner.
Just above the scavenge ports.
On a Container vessel, what is the function of a buttress?
To support the lowest tier of containers in a non-cellular cargo hold
When used at the base of container stacks its prevents the tank top plating from being pierced
To support container stacks in a non-cellular cargo hold
To support the lowest tier of containers in a con-bulker's cargo hold
On a General Cargo Vessel the Tonnes per Centimetre (TPC) of a vessel is 30; the present mean draught of the vessel is 6.90 m and the maximum summer load draught is 7.00m; Calculate the amount of cargo that can still be loaded?
The amount of cargo that can still be loaded is 300 tonnes
The amount of cargo that can still be loaded is 3000 tonnes
The amount of cargo that can still be loaded is 30 tonnes
The amount of cargo that can still be loaded is 3 tonnes
Under which MARPOL category are vegetable oils classified?
Category "Z".
Category "Y".
Vegetable oils are not classified under the MARPOL categories.
Category "OS" (other substances).
How many separate means of escape are provided from each fire zone above the bulkhead deck?
Don't know
Two
Three
One
Who is responsible for supervising stevedores during cargo operations?
The master
The duty officer
The chief officer
The stevedoring foreman
What is the purpose of the IGC code?
The purpose of the IGC code is to provide an standard for safe carriage of liquefied gases in bulk
The purpose of the IGC code is to protect the oil companies
The purpose of the IGC code is to provide an international standard for safe carriage of liquefied gases in bulk
The purpose of the IGC code is to provide safe carriage of liquefied gases in bulk
Which of the following areas may be possible restricted areas? (Review all answers)
The Cargo control room
The Bridge
All alternatives
The Engine control room
To correctly interpret the readings on the printout from a reefer vessel’s cargo data logger it is essential to have some knowledge of the location of the temperature sensors. Where would the temperature sensor for the delivery air to a cargo hold be expected to be located?
Just above the cooling coils where the air returns from the cargo space.
In the air flow path from the cooling coils, about 3 metres from the coils.
In the air flow path from the cooling coils, but at the opposite end of the cargo space to the coils.
Near the centre of the cargo space.
When planning bunkering operations it is preferable to arrange for the new fuel to be bunkered into empty or nearly empty tanks whenever possible. What is the main reason for this?
To minimise the risk of microbial contamination of the fuel.
To make it easier to calculate the quantity of fueltaken onboard.
To minimise the risk of incompatibility between different fuels.
So that the sulphur content of each fuel is known.
Indicate the correct name of the tool on the sketch:
Chisel
Drill press
File
Shaping machine
What name is given to the technique of combining a light mixture with a heavier one, without beating or stirring, but lifting gently from underneath with a spatula or spoon, in an "over and over" circular motion?
Threshing.
Folding.
Firming.
Turning.
Why are many machinery components onboard ship now tightened using cylindrical jacks and hydraulic oil pressure rather than more traditional methods such as, for example, the use of torque wrenches?
Hydraulic tightening avoids the risk of unwanted bending stresses when compared to other methods.
Hydraulic tightening of fastenings is always more accurate than any other method.
It is easier to slacken off component fastenings that have been tightened hydraulically when maintenance is due.
It is possible to get the component fastenings tighter using hydraulic equipment than by using other methods.
Which of the following precautions would you take to ensure that you do not collapse due to the presence of gas in a recently cleaned cargo tank?
Refer to the applicable Enclosed Space Entry Permit to verify that the tank has been tested as gas free and is marked as safe for entry. If in any doubt, request a new test.
Wear a filter mask, fitted with the cartridge appropriate for the last cargo carried in that tank.
Enter the tank but, if the fumes become too strong, complete your task and leave as quickly as possible.
Tell another watch keeper that you are going down into the tank, making sure he knows exactly which tank it is.
A medium speed diesel engine which is supported on a steel chocking system has had repeated problems with two of the chocks at the end of the engine on the port side becoming slack. This has led to some fretting damage to the bedplate and tank top in that area. What action should be taken to affect a cost effective permanent repair?
Replace the damaged chocks with resin based chocks of an appropriate size.
Replace the complete steel chocking system with a resin based system.
Tighten the holding down bolts in that area to 150% recommended load to prevent further slackening and fretting.
Replace the complete steel chocking system with one using resilient mounts to accommodate movement and avoid further incidents of fretting.
Which of these situations will cause undue delay to a vessel at her port of discharge?
Slow operation of hatch covers
Carrying out an off-hire survey
Carrying out an open-hatch condition survey
Asbestos mixed with the cargo
Which of the following symptoms would indicate that the filter drier in a refrigeration circuit has become blocked?
A hammering noise from the drier.
A pressure rise before the drier.
A large temperature drop across the drier.
A hammering noise from the compressors.
Is it required to have supplementary emergency electric lighting on board ro-ro ships?
No, portable battery operated lamps shall be provided in alleyways and public spaces
No, reflective marking indicates the escape routes
No, passengers should bring their own flashlights
Yes, all passenger public spaces and alleyways shall be provided with supplementary electric lighting
A situation exists where a cargo of palletised fruit is being loaded to capacity on a conventional reefer vessel. In order to load all of the available cargo it is proposed to break down some of the pallets and place the loose cartons on top of the pallets; there is just enough space to accommodate this below the deckhead. From the options given which is the most suitable action to take?
Reject the plan as the extra handling will incur greater stevedoring costs.
Reject the plan as the charter is to carry only palletised cargo.
Reject the plan as the reduced gap at the top of the stow will restrict the return air flow.
Accept the plan in order to carry all of the cargo.
According to the IBC Code, the master of a chemical tanker must be supplied with a loading and stability information booklet. What must this booklet contain?
Summary details of light ship and fully loaded conditions and of a representative part-loaded condition, with examples of calculations of typical pre-departure stability conditions and an example of a damage stability calculation to enable the master to determine survival capability in the event of an emergency involving a breach of the hull.
Details of service and ballast conditions for loading based on the range of products which a vessel is certified to carry, incorporating the maximum permissible DWT, the maximum permissible SG of any product, the maximum permissible trim and any structural constraints that will impact a loading condition.
Certificates confirming the testing and calibration of tank gauging equipment, the ship's stability computer program and the accuracy of draft and loadline marks.
Details of typical service and ballast conditions, provisions for evaluating other conditions of loading and a summary of the ship's survival capabilities, together with sufficient information to enable the master to load and operate the ship in a safe and seaworthy manner.
What distinguishes a "parcel" chemical tanker from other designs?
Such a vessel is fitted with interactive computerised gauging, pumping, valve control and alarm systems for each tank, enabling all data for a single cargo to be concentrated in a single computer display.
Such a vessel is automatically able to achieve segregation of hazardously reactive noxious liquid substances by its design alone.
Such a vessel is fitted with a highly accurate tank gauging system, enabling it to deliver multiple parcels to different receivers from within the same cargo tank.
Such a vessel has a higher number of relatively small capacity, independent cargo tanks, each with its own line and pump, enabling it to carry and deliver multiple grades simultaneously.
What can happen with a lub. oil cooled piston if You stop the lub. oil pump immediately after You stop the engine?
You save the oil sealings in the piston.
Nothing happens.
The oil flashpoint will be changed.
Overheating of the piston, and oil coke deposits in the cooling chambers.
Which of the function shown is this operational amplifier circuit performing?
Differentiator
Inverting amplifier
Integrator
Non-inverting amplifier
A new cylindrical brass bearing sleeve for a pump shaft is found to be a few millimetres too long for the housing and needs to be adjusted to the correct length. Which will be the best method to use to reduce the length of the sleeve to the correct dimension?
Remove the excess length using the ship's lathe.
Grind off the excess on a pedestal grinder for quickness.
Cut off the excess with a mechanical hacksaw.
Manually hacksaw off the excess and dress the end with a file.
If left-over cooked meat is to be re-used in another meal, which of the following precautions must be taken?
The meat must be fine chopped to ensure it re-heats to at least 70 degrees Celsius as quickly as possible; it must not be mixed with newly preared raw meat; the dish in which it is used must only be heated once.
The meat can be directly added to another dish and musdt be re-heated to the temperature required by the new recipe; it can then be re-heated for further servings provided it is refrigerated in between.
The cooked meat must have been refrigerated until required; it can be taken out, chopped and mixed thoroughly with newly cooked ingredients, to ensure it is adequately re-heated. If it cools before serving, it can be warmed through on a hot plate or under a heat lamp.
The meat must be sliced to a thickness of less than 5 mm to ensure it re-heats to at least 50 degrees Celsius during cooking; it can only be layered with other previously cooked ingredients; the dish in which it is used can be re-heated again, provided it is refrigerated between each serving.
What is the correct sequence of washing a cargo hold?
Saltwater wash, freshwater rinse, dry, sweep
Freshwater wash, saltwater rinse, dry, sweep
Sweep, freshwater wash, saltwater rinse, dry
Sweep, saltwater wash, freshwater rinse, dry
What is the minimum MARVS on a fully pressurised liquefied gas carrier?
Not be less than 7 bar.
Not less than the gauge vapour pressure of the cargo at 45 degrees C.
Not less than the gauge vapour pressure of the cargo at 0 degrees C
Not less than 0.7 bar.
What is a Marine Evacuation System?
Helicopter evacuation
Assistance from other ships
Evacuation Chute(s)/Slide(s) and Liferafts
Liferafts supported by Fast Rescue Boats and Lifeboats
From the options given, select the one which best completes the following statement. "A seaman who is required to work in a hatch containing perishable goods should wear gloves that are…
…canvas."
…leather palmed."
…clean."
…insulated."
All cargo hatch covers on a bulk carrier are to be hose tested in the presence of a surveyor, prior to loading a cargo of steel coils; what should be done to the hatch covers before the test?
Hatch covers in open position
Hatch cover to be lowered by jacks onto seals but not secured
Hatch cover in normal port condition ready to open
Fully secured to a sea- going condition with all side cleats ( if any) fitted
A Ship Security Assessment is integral to the creation of your ship’s security plan.
FALSE
TRUE
.
A wire rope lashing is connected to an eye plate by means of a shackle. What is the Maximum Securing Load (MSL) for this lashing?
The Minimum Securing Load of the shackle
The Minimum Securing Load of the eyeplate
The Minimum Securing Load of the wire rope
The Minimum Securing Load of either the wire rope or shackle or eye plate
Which is the preferred state to have the main turbine in while shutdown for a short stay in port?
Left with autospin operating to give periodic turning.
Gland steam left on to keep the rotor and casing warm and with turning gear switched off but engaged to 'lock' the rotor in position.
Turning with the turning gear and gland steam on.
All steam shut off with turning gear switched off but engaged to 'lock' the rotor in position.
Large bulk carriers are more likely to suffer from cracks in structure in which of the following parts of the vessel?
In after peak area
In number 1 and number 2 holds
Around hatch corners and upper ballast tanks amidships
On bottom plating in the after part of the vessel
Which of these statements about profiling is correct?
Check the ID of all visitors and some crew prior to boarding.
Pay less attention to body language and behaviour and more attention to answers to questions.
Use only open-ended questions.
Verify that answers to questions match up with what’s already known about the person being questioned.
Many LNG vessels have spherical cargo tanks. Which of the statements given in the options is the most accurate?
Using spherical tanks means double hulls are not required.
Using spherical tanks means that the cargo can be carried at pressures well above atmospheric.
Using spherical tanks allows more cargo to be carried as the tank is positioned above the deck.
Using spherical tanks means only a partial secondary barrier is required.
How often should boiler water tests be carried out on a steam boiler?
Every hour.
Every day.
Every fortnight.
Every week.
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