%20scale(3)'%3E%3Cpath%20id='s'%20d='M0,-30%2017.63355,24.27051%20-28.53171,-9.27051H28.53171L-17.63355,24.27051z'%20fill='%23FF0'/%3E%3C/g%3E%3Cuse%20xlink:href='%23s'%20transform='translate(300,60)%20rotate(23.036243)'/%3E%3Cuse%20xlink:href='%23s'%20transform='translate(360,120)%20rotate(45.869898)'/%3E%3Cuse%20xlink:href='%23s'%20transform='translate(360,210)%20rotate(69.945396)'/%3E%3Cuse%20xlink:href='%23s'%20transform='translate(300,270)%20rotate(20.659808)'/%3E%3C/svg%3E){kind=small}
Rechercher les postes actuellement vacants :
Afficher les filtres
Rechercher dans la base de données des CV des marins :
Tests en ligne : Test online CES 5.1 for Ch-Eng / 2nd-Eng
Sélectionnez le mode de test :
Éducation
Test en ligne
Description
Le test consiste en des questions aléatoires sur un sujet sélectionné.
Question 1 depuis 90
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
Which one of the listed requirements regarding lifeboat propulsion do not correspond to present regulations?
The engine shall be provided with an electric power starting system with rechargeable energy batteries
Every lifeboat shall be powered by a compression ignition engine using fuel with a flamepoint of not less than 44°C
Means shall be provided for recharging all engine-starting, radio and searchlight batteries
Water resistant instruction for starting and operating the engine shall be provided
Where on board would you find out which fire sections are enclosed by "A" or "B" class divisions?
In the stability book
On the capacity plan
On the fire control plan
On the general arrangement plan
*Is it compulsory for a cargo ship to be divided into main vertical zones?
Yes, it is, but they need not be bounded by class "A-60" bulkheads
No it is not
It depends on the gross tonnage of the vessel
Yes, it is
*Which of the following statements applies to fire doors in main vertical zone bulkheads and stairway enclosures in passenger ships?
They shall be of the self closing type
They shall be capable of closing with an angle of up to 3, 5° opposing closure
They shall be capable of being closed from a control station
All the mentioned alternatives
*Could a lift be considered as an escape route from the engine room ?
Yes, if it is constructed with class A materials
No
It depends on the distance of the escape route
Yes
Halons are decomposed in toxic products when they are applied at temperatures near
500 ?C
350 ?C
1000 ?C
100 ?C
Fixed pressure water-spraying fire-extinguishing systems are widely employed in all kinds of vessels, mainly passenger ships and ro-ro ships, with a high degree of success. The aim of these systems is to put out a fire but they may also be very useful even if they only ensure
the control of temperatures of surrounding areas
the structural protection of the vessel
all the answers are good
the confinement of a fire
What alarm signal must be sounded by the alarm bells in case of fire?
Series of short blasts
A continuous signal
The signal which is stated in the muster list
One long blast followed by seven short blasts
What must be the first concern of the fire fighting team leader?
Fire prevention
Fire isolation
Fire fighting
Life saving
Who are responsible for safe working conditions onboard?
The individual person.
The officer of the watch.
The safety officer.
Master, Chief Engineer & Chief Officer.
After checked for open airway, given the first two inflations and checked the pulse to make sure that the heart is beating, what is the rate of inflations given until natural breathing is restored ?
12 - 16 times per minute
10 - 12 times per minute
Doesn't matter how many times
25 - 27 times per minute
Abdominal Thrust is the name on a technique which involves applying a series of thrusts to the upper abdomen in an attempt to force air out of a choking casualty's lungs. How to perform this technique?
Remove the obstruction and restore normal breathing.
Lay casualty on a hard surface, e.g. deck, and press firmly and rapidly on the middle of the lower half of the breast bone.
Stand behind the casualty. Clench your fist with the tumb inwards in the center of upper abdomen. Grasp your fist with your other hand and pull quickly inwards.
Let the casualty grab a list and hang up right down for a period of minimum 5 minutes.
In MARPOL 73/78, the term "Special Areas" is mentioned in connection with discharges from oil tankers. What do you understand by this term?
Specific geographical sea areas, designated as Marine Conservation Areas by the United Nations, in which any discharge from the cargo area of an oil tanker is strictly controlled.
All sea areas within 50 miles from the nearest land, where that coastal state is a signatory to MARPOL 73/78.
Limited ocean and sea areas, listed under the OPA-90 Act, inside which the discharge of oil is prohibited and the penalty for doing so is an umlimited fine and unlimited jail sentence.
Specific geographical sea areas, defined in MARPOL 73/78, in which special mandatory measures for the prevention os sea pollution by oil are required.
If the radar is set onto the Relative Motion Display, what would an echo of a target with no trail indicate? Note this the trail of the echo and not a vector.
The target is on the same course and speed as own ship.
The target is stopped and making no way through the water
The target is on a constant bearing and getting closer to own ship.
The target is on a collision course with own ship.
An alarm signal consisting of seven short blast followed by one prolonged blast is sounded by the ship's whistle and alarm bells. What are you to do ?
report on the bridge (deck crew) or engine room (engine crew) for further orders
go to (or remain in) your cabin and await further orders
go to your fire station
go to your muster station
What is a "certificated" person which is placed in charge of each survival craft ?
any deck or engine officers on board, provided that they hold a STCW compliant certificate
a person which has been certified by the master as being able to be in charge of the survival craft in question
any deck or engine officer on board
a person who holds a "certificate of proficiency in survival craft"
Which item among those below is included in the normal equipment of every lifeboat ?
two buoyant smoke signals
sea-charts and navigating equipment
one life-jacket for each person
an EPIRB
You are starting to get low on water in the lifeboat. What should you do?
Drink urine
Mix sea water with 50% fresh water
Use sea water
Collect rain water
An enclosed lifeboat is fitted with a self-contained air support system. With the engine running, what is the minimum period of time the air should remain safe and breathable?
10 minutes
30 minutes
5 minutes
20 minutes
*Give the meaning of the following symbol
Start ventilation of the rescue boat
Start air supply
Start air filling of the davit launched liferaft
Start ventilation of the lifeboat
Give the meaning of the following symbol
Rocket parachute flares
Survival craft portable radio
EPIRB
Radar transponder
An abandon ship drill must take place 24 hours after the ship leaving a port with new crew members
if they are more than 10% of the total crew
if the total crew has been replaced
if they are more than 50% of the total crew
if they are more than 25% of the total crew
*Which of the following detailed explanations should be mentioned in the Training Manual ?
How to use navigational equipment for survival crafts
How to release from launching appliances
How to use escape routes and other escape methods
How to use surface to air visual signals to be used by survivors
During test and/or maintenance work of the CO2 system affecting the release system, precautions to ensure that the gas is not released into the engine room due to a mistake are to be ensured. What precautions should be taken?
No special precautions necessary.
Arrange a watchman in the CO2 central.
Check the main valve for a potential leakage.
The main supply line to be blanked off prior to the work.
Which of the following precautions should be taken when work is to be carried out on the radar scanner unit on the mast?
Only the electrical fuses for the radar undergoing repairs needs to be removed, allowing the ship to retain a workable radar
Only the electrical fuses for the scanner motor needs to be removed.
A "Not to be used" sign on all radars and fuses for the complete radar systems to be removed
A sign needs to be attached to all the radars warning the bridge officers of repairs and the fact the radars are "Not to be Used"
What is the requirement regarding number of slop tanks on oil tankers of 70,000 tons and above delivered after 31 December 1979?
Shall be provided with at least 2 slop tanks.
Shall be provided with slop tank.
No requirement regarding number of slop tanks.
Shall be provided with sufficient number of slop tanks.
Basic manual dew point measurement devices are commonly used by surveyors when monitoring the dryness of a cargo tank prior to loading a liquid chemical product. Which of the descriptions below is a summary of how the measurement is carried out?
A small quantity of Methanol is placed into the device and dry-ice is progressively added to it to steadily reduce the temperature. A sample of the atmosphere in the tank is continuously drawn through the device, passing over the surface of the Methanol. When the first signs of evaporation are observed (smoke rising from the surface), the temperature of the Methanol is noted. Reference may be required to tables to correct the reading for calculation purposes.
A quantity of Acetone is placed into the device and dry-ice is progressively added to it to steadily reduce the temperature. A sample of the atmosphere in the tank is continuously pumped through the liquid. Bubbles will be seen to reach the surface of the bath until the dew point is reached. When the flow of bubbles ceases, the temperature of the Acetone is noted. Reference may be required to tables to correct the reading for desired parameters.
A small quantity of Acetone is placed into the device and dry-ice is progressively added to it to steadily reduce the temperature. A sample of the atmosphere in the tank is continuously drawn through the device, passing over the polished or mirrored surface of the container. When the first drop of mositure (dew) is observed to form on the polished surface, the temperature of the Acetone bath is noted. Reference may be required to tables to correct the reading for desired parameters.
A small quantity of dry-ice is placed into the device, submerged in deionized water. A sample of the atmosphere in the tank is continuously drawn through the device, passing across a reagent filter. When the dew point is reached, this reagent filter will change colour from white to green, indicating saturation. The temperature of the deionized water is noted at this time and corresponds to the dew point. Reference to correction tables is required to correct the reading for barometric pressure.
The IMO Gas Codes require that all liquefied gas carrier cargo tanks are fitted with pressure relief valves. Pilot operated relief valves are frequently used, particularly with refrigerated cargoes. What is the main advantage of using pilot operated relief valves rather than simple spring loaded types for refrigerated liquefied gas cargoes tanks?
The set pressure can be adjusted to above MARVS if problems occur with the reliquefaction plant.
When pilot operated valves are used only one valve per cargo tank is required irrespective of tank size.
They ensure accurate operation at the very low cargo carriage pressures.
They ensure accurate operation at the very low cargo carriage temperatures.
What is the safe time for operating the crankcase door when oil mist alarm is activated and the engine has been stopped?
After 20 minutes
After 1 minute
After 10 minutes
After 5 minutes
What is the minimum number of bolts required in a 12 inch bolted flange cargo hose coupling?
8 bolts
4 bolts
6 bolts
A bolt in every hole
On the figure 4 possible definitions of the term "LENGHT OVERALL" are given. Which one is the correct one?
Lenght overall is given by C on the figure
Lenght overall is given by B on the figure
Lenght overall is given by A on the figure
Lenght overall is given by D on the figure
On the figure 4 possible definitions of the term "BOLLARD" are given. Which one is the correct one?
Bollard is given by C on the figure
Bollard is given by D on the figure
Bollard is given by A on the figure
Bollard is given by B on the figure
A bulk carrier is to carry a full deck cargo of packaged timber; to what regulations must the vessel comply?
Grain Regulations
International Code for the carriage of Dangerous Goods
IMO Code of Practice for the carriage of Timber Deck cargoes
Marine Pollution Regulations
What is the most important treatment concerning a foreign body in the eye?
Wring the eye-lid to prevent blinking
Local anaesthetic
Rinsing of the eye with water
Keep the eye closed
What should be done after discharging coal with a high sulphur content from a bulk carrier?
Areas of corrosion in the cargo holds should be noted
An inspection of cargo hold areas prone to cracking should be carried out
An inspection of cargo hold areas prone to fatigue should be carried out
Cargo holds should be thoroughly washed and cleaned
What is the endless piece of rope used extensively for the slinging of cases or bales, called?
Bale sling strop
Rope snotter
Endless sling
Cargo net
An engine room rating is given the task of retightening the flanges of a pipe that has been replaced in the engine room. Which of the following tightening procedures should be followed?
Start with the bottom bolt and partially tighten each bolt in turn working counter-clockwise around the flange. Repeat to fully tighten.
Fully tighten each bolt in turn and work diagonally across and around the flanges.
Gradually tighten all of the bolts working diagonally across and around the flange.
Start with the top bolt and fully tighten each in turn moving clockwise around the flange.
Which herb, native to the Mediterranean region, has green spiky leaves and is often used in the preparation of lamb dishes?
Thyme
Parsley
Rosemary
Sage
During maintenance of a pneumatically operated, diaphragm actuated control valve the diaphragm is found to be split. Select, from the options given, a suitable material to use to make a temporary replacement if there is no spare diaphragm available.
Natural rubber sheet of greater thickness and lower elasticity as the original diaphragm material.
Cotton reinforced rubber insertion sheet of smaller thickness but similar strength as the original diaphragm material.
Natural rubber sheet of approximately the same thickness and elasticity as the original diaphragm material.
Cotton reinforced rubber insertion sheet of approximately the same thickness but less elasticity than the original diaphragm material.
When is a vessel considered unseaworthy?
When cargo has been damaged due to heavy weather
When cargo has been damaged due to ingress of water
When due diligence has not been exercised to make it seaworthy
When it is not cargo worthy
An LNG carrier is equipped with membrane type tanks with a MARVS less than 0.7 bar. What additional cargo containment requirements, if any, are needed for this type of cargo tank arrangement?
Only a partial secondary barrier is required.
No secondary barrier is required as this is a self supporting arrangement.
Only a drip tray is required.
A full secondary barrier is required.
If a cargo is heated, which of the following happens?
Its weight does not change, but its volume increases - it expands.
Its volume does not change, but its weight decreases - it gets lighter.
Its weight does not change, but its volume decreases - it contracts.
Its volume does not change, but its weight increases - it gets heavier.
The figure shows a cross section through a ship floating in water, with the hull in red and the seabed below the ship shaded. On the figure there are four (4) possible definitions of the term "FREEBOARD" given. Which one is the correct one?
Freeboard is given by B on the figure
Freeboard is given by C on the figure
Freeboard is given by A on the figure
Freeboard is given by D on the figure
What is the minimum number of ”Firemen’s outfit” on gas tanker, above 5,000 m3, carrying flammable products?
2 sets of Firemen’s outfits
4 sets of Firemen’s outfits
3 sets of Firemen’s outfits
5 sets of Firemen’s outfits
What is a deck lift vehicle?
This is another term for a portable vehicle deck
A portable deck used to raise or lower vehicles
A vehicle used to raise or lower portable decks
A vehicle used to raise or lower decks on which vehicles are stowed
Signals used by aircraft engaged in search and rescue operations to direct ships towards an aircraft, ship or person in distress. What is the meaning of the signal?
Medical assistance required
Landing is highly dangerous
The assistance of the vessel is no longer required
The aircraft is directing a vessel towards an aircraft or vessel in distress
During maintenance work on a compensated mechanical hydraulic governor air is drawn in to the hydraulic circuit after draining and flushing out the unit. Which of the actions given in the options is most likely to assist in the removal of the air from the system?
With the governor in operation open the compensation needle valve to introduce instability and disturb the engine load to make the governor hunt.
With the governor in operation close the compensation needle valve and disturb the load to make the engine hunt.
Overfill the governor with fresh oil to force all of the air out.
Drain the governor again and slowly refill with fresh oil.
The temperature control for the central cooling system low temperature circuit has failed and a new 3 term controller is to be fitted. Which of the given options would be the correct method of setting up the controller?
Set the derivative action first.
All three actions should be set simultaneously.
Set the proportional action first.
Set the integral action first.
How does the Master want the tug secured?
The Master wants to secure the tug using two backsprings
The Master wants to secure the tug using two breast lines
The Master wants to secure the tug using one head line and one stern line
The Master wants to secure the tug using two head lines
When should carbon dioxide gas be injected into a cargo hold containing bagged fishmeal?
When temperatures taken around the cargo hold exceed 35?C
When ambient temperatures exceed 38?C
When cargo temperatures exceed 55?C and heating continues
When smoke starts issuing from a cargo hold
Which alternative is correct for measuring current over the load L?
Figure 2.
Figure 1.
Figure 4.
Figure 3.
What English term is given to the "growth" that develops on foodstuffs that have been imptoperly stored over a long period?
Meld.
Mild.
Mealed.
Mould.
Why is an automatic slow turning feature included in the start air system of many large 2 stroke diesel engines?
To avoid damage during start of the engine in case water or other liquid has gathered in the cylinders during an extended stop.
To fill the cylinders with sufficient fresh air to ensure a safe start of the engine.
To check that all indicator cocks are closed before staring the engine..
To reduce the start air consumption during start up of the engine.
When preparing the hold of a bulk carrier for cargo when that hold has previously been ballasted, which of the following must be checked
The ballast lines must be blanked off and the bilge lines opened and tested
Previous cargo swept out
The heating coils fitted
Paint coating re- painted
What distinguishes vapour connections (headers) from liquid cargo connections on a ship's manifold?
Liquid and cargo connections actually appear the same, but the ship's personnel always attach a small board to the applicable flange, identifying the cargo to be loaded and indicating whether it is for the liquid or vapour hose.
Vapour connections are painted yellow with green end bands, are marked with the words "not for liquid" and have a small hole capable of receiving a stud on the flange face at the six o'clock position.
Liquid connections are always marked with the corresponding tank number, while vapour connections are marked with the letter "V".
Vapour connections are painted yellow with red end bands, are marked with the word "vapour" (or "vapor") and have a small stud located on the flange face at the twelve o'clock position.
Which line can be utilized to prevent line surge when starting the main pumps of a LNG carrier's cargo system?
The vent line.
The inert gas line.
The condensate spray line.
The aeration pipes.
What is the correct method to use for fitting a rolling contact bearing, such as a ball bearing, onto a parallel shaft?
Use emery cloth on the inner ring (contact surface) of the bearing.
Use a hammer and a pipe with the same diameter as the inner bearing ring and knock the bearing onto the shaft.
Gently heat the bearing in an oil bath and use a bearing puller to draw it onto the shaft..
Use emery cloth on the bearing surface on the shaft.
After a couple of hours of operation the failure alarm sounds for a heavy fuel oil purifier which is operating on a timed automatic sludge cycle. Upon investigation the purifier is found to be running slowly and when opened up the casing and sludge outlet is heavily fouled with sludge in contact with the bowl. From the options given what is the most likely cause of this problem?
The heavy fuel is unstable leading to excessive high viscosity sludge formation.
The dirty oil throughput is excessive.
The purifier bowl has not closed properly.
The clutch for the drive shaft is worn and slipping.
When measuring flow of fluids with a fixed area flow meter, the name of the sensing device is?
Float
Positive displacement rotor
Turbine rotor
Orifice plate
When would the cargo tanks of an LNG carrier normally be inerted?
Immediately after every cargo discharge operation.
Immediately before any of the ship's personnel enter the cargo tanks.
Before gas freeing for maintenance and inspection and after completion of the maintenance and inspection.
Immediately before every cargo loading operation.
A consequence of operating a centrifugal pump with the discharge valve closed would be:
Relief valve will open
Pump will overheat
Motor will overheat
Motor overload will open
A bulk cargo of steel coils is loaded and a number of the coils are noted by the Chief Officer to be rusted; what must the Master ensure?
Steel coils to be discharged
Clause the Bill of Lading with the reference numbers of the rusty coils and so make the Bill of Lading a "dirty" Bill.
No action needs to be taken.
Cargo temperatures measured on voyage
Which of the following statements is incorrect with regard to loading bagged fishmeal?
Cargo holds should be free of cargo residues
Cargo holds should be free of infestation
Dunnage is not required
Cargo holds do not require ventilation
What is the main fixed fire-fighting system on a car deck?
CO2
Dry powder
Water sprinkling
Halon
Debriefing of an emergency drill:
focuses attention on the debriefer's feedback
expands the experience of all personnel
encourages crewmembers to focus on their duties
is most effective when held at a safety meeting
What documentation allows a General Cargo Vessel to load dangerous package goods?
Safety Construction Certificate
Document of Authorisation for the carriage of bulk grain
Document of Compliance for carriage of dangerous goods
SOLAS Safety Equipment Certificate
The meaning of lapping a valve and valve seat is:
Machining the valve in a lathe machine.
Grind the valve against the valve seat to obtain a uniform sealing surface
Repair by welding
Adjust the overlapping of the inlet and exhaust valves
When a submerged centrifugal cargo pump is being run at too high a speed during discharge of a viscous cargo, the pump may start racing, causing a heat build-up around the suction, possible localised solidification of the cargo and consequent damage to the pump. What term is applied to this problem?
Synthesis.
Cavitation.
Aggregation.
Gravitation.
The economizer is used for
Desuperheating of the steam
Heating of the feed-water
Lower the superheater temperature
Heating of the fuel oil
Furniture in stairways and corridors shall be kept to a minimum on board passenger ships, why?
Escape routes must be clear of obstructions and also due to fire protection
It is not allowed to sit in stairways and corridors
Due to fire protection
Passengers will most probably sleep in stairways and corridors if they are furnished
On a RoRo vessel, a vehicle weighing 50mt is to be loaded in the fore and aft direction and lashed by chains/turnbuckles of SWL 5mt. By the general Rule How many sets of chains/turnbuckles should be used to secure the unit?
At least 10 in total
At least 10 per side
at least 15 per side
You have just loaded a cargo of Toluene and are about to clear the lines into the ship. What particular hazard must you be aware of with this product?
It is a carcinogen but has a relatively high odor threshold value. Personnel may not readily detect any vapour that is ejected through the vent risers and should therefore use filter masks while this operation is in progress.
It is a static accumulator and settling time must be allowed before gauging.
It has a relatively high freezing point and additional line blowing will be required to ensure the vessel's lines are completely clear.
It has a relatively low density. Tanks which are close to maximum filling are especially liable to overflow during the line clearing operation unless the flow of blowing medium is strictly controlled.
During loading of a palletised refrigerated cargo it is noticed that some of the pallet boards are badly damaged. Which one of the actions, from the options given, is the most appropriate?
Remove and repair or replace the damaged pallets before loading them.
Note the number of damaged pallets involved on the Mate's receipt.
Accept the cargo loaded on the damaged pallets and repair them onboard.
Take no action as a small number of broken pallets are an acceptable part of such an operation.
Where would you normally expect to find the air vent cock on a steam boiler?
At the feed water inlet pipe connection.
At the highest point of the steam drum.
At the superheater outlet
On the highest point of the steam range.
How can the officer in charge change the value of the Transverse Metacentric Height?
By loading or discharging cargo and changing the position of both G only.
By vertically shifting cargo and changing the position of both G and M.
By loading or discharging cargo and probably changing the positions of G and M.
Only by loading cargo and changing the position of both G and M.
Consider the situation sketched below. What can happen if the tugmaster is not careful?
The tug may be turned across your bow with the danger of being turned over.
The stern of the tug may be sucked into your bow.
The tug may be pushed away from the ship and thus unable to assist your vessel.
The tugmaster may loose control and ram your bow with possible damage to your ship.
You are in an area of restricted visibility, close to a port. You hear this signal. What vessel does it come from and what additional information does the signal provide?
A vessel at anchor, more than 100 metres in length. She is sounding the additional signal to give warning of her position.
A vessel aground, more than 100 metres in length. The additional signal indicates which side the clear water lies on.
A vessel at anchor, less than 100 metres in length. She is sounding the additional signal top give warning of her position.
A vessel at anchor, more than 100 metres in length. The additional signal indicates that her cable extends at least 25 metres from her bow.
What are defined as the gas dangerous areas onboard a gas vessel?
Gas dangerous areas onboard gas carriers are cargo compartments and cargo piping
Gas dangerous areas onboard gas carriers are cargo compartments and cargo piping, hold spaces and other spaces where cargo pipes are located
Gas dangerous areas onboard gas carriers are cargo compartments and cargo piping, hold spaces and other spaces where cargo pipes are located, compressor and pump room, open deck over cargo area
Gas dangerous areas onboard gas carriers are cargo compartments, cargo piping and bunker tanks with pipes
Why may wearing sweat rags slung round your neck when working in the machinery spaces be hazardous?
The rags may cause sweat rash.
The rags may cause you to get too hot and faint.
The rags may be caught by running machinery or power tools.
The rags may be soaked with oil and catch fire.
The demister unit is located close to the inert gas scrubber. What is the purpose of the demister?
To prevent overheating:
To remove sulphur oxides.
To cool the inert gas.
To remove water from the IGS stream.
High-level alarms are always switched on during loading operations. Is it necessary to have them switched on during discharge operations on a chemical tanker?
The only way a high level alarm will activate during discharge is as the set level is passed as the tank empties. It is therefore of no value to have them switched on.
No, the alarms are only of value and significance for an increasing liquid level such as is found during loading.
Yes, there is still a risk of overflow if several tanks are connected to a common line system.
It is wholly the choice of the Officer of the Watch whether he uses high level alarms during a discharge operation.
These circuits are all active filters. Which of the circuits is a low-pass filter?
Figure 3
Figure 1
Figure 2
Figure 4
What is a ZENER BARRIER?
A zener barrier is a device used for speed regulation on electric motors.
A zener barrier is a device that allows the current to pass only one direction.
A zener barrier is a unit made to obtain intrinsically safety in installations for instrumentation in hazardous areas.
A zener barrier is a diode bridge used in rectifiers.
When overhauling the cylinder covers on a modern 4-stroke engine, is it important not to interchange inlet and exhaust valves?
Not so important
Can be changed if same size
Important due to different material and working conditions
Important due to different type size valve guide.
Which of the pressures is the most satisfactory at the suction of an air conditioning freon compressor?
4.5 bar
0.5 bar
7.0 bar
2.0 bar
Which of the below statements characterizes the most significant differences between a water-tube boiler and a fire-tube boiler during operation?
The firetube boiler has a much better capability to work at higher steam pressure.
The watertube boiler can tolerate a short period of time without any water, when the oilburner is still in action.
Water-tube boilers are more efficient and contains less water. They suffer from major damages when run dry during operation.
The firetube boiler does not need any non-return valves in the feedwater line circuit.
What may be the reason to an unsatisfactory separation result for a fuel oil separator of ALCAP type?
Broken water seal.
Low level in the fuel oil settling tank.
Sludge deposits in operating system.
Throughput too high.
What refrigerant temperature would you expect to find at the compressor suction of an air conditioning system?
+ 30 ° C
+ 5 ° C
- 5 ° C
- 10 ° C
What is the separator's intention?
To keep constant level in the service tank.
To remove solids, water and sludge.
To remove water and sludge.
To remove water.
In a circuit diagram of a simple hydraulic system, what does the following symbol indicate?
Throttle valve.
Directional control valve.
Pressure relief valve.
Check valve.
Ce test en ligne se compose de 90 questions aléatoires issues des tests CES 5.1 sur un sujet de votre choix.