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在线测试： Test for specialists working in Engine room (CES v6.0)
在线测试
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该测试由 80 个随机问题组成。
有关此主题的总问题： 147
有关此主题的总问题： 147
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When referring to onboard oil treatments using a centrifuge, what is meant by the term purification?
Separation of solid contaminants from a liquid during the process.
Separation of two insoluble liquids with different densities, and the removal of solids in the same process.
It is a general term applied to a process for cleaning oil using a centrifuge.
Separation of one insoluble liquid from another.
What is the objective of the merchant navy?
To earn money for the shipowner.
To transport and deliver goods as quickly as possible.
To provide employment for persons who wish to become seafarers.
To safely transport goods by sea.
An earth fault exists on the blue line of a 100 A bilge pump circuit. A second earth fault occurs on the yellow line of a 10 A ventilation fan circuit. Both systems are supplied from the ship’s 440 V supply. The likely outcome is that:
A short circuit occurs between earth faults and the ventilation fan fuse blows.
An open circuit occurs between earth fault and both motors trip out.
A short circuit occurs between earth fault and the bilge pump fuse blows.
Both motors trip out on overload.
The packed gland on a centrifugal pump is leaking even though the gland has been “nipped up”. What is the correct action to take to stop the leakage?
Tighten up the gland as much as possible until the leakage stops.
Ensure the bilge well to which the leakage is draining is regularly pumped out.
Re-pack the stuffing box loosely with the correct size packing at the earliest opportunity.
Fit an extra ring of oversize packing to the stuffing box at the earliest opportunity.
The lubricating oil in the bearing housing at the turbine end of a turbocharger gets very dirty after only a few hours in service. What is the most likely reason for this happening?
The wrong type of lubricating oil has been used.
Damaged rotor shaft sealing bushes allowing exhaust gas to leak into the bearing housing.
The turbine end bearing is badly worn.
The lubricating oil filling connection screw cap is missing.
What is the main advantage of having a central cooling system fitted on board ship?
It should require less maintenance than a conventional system using only sea water.
It is a simple system with minimum control requirements.
It does not require any seawater.
Only one heat exchanger is needed for all cooling duties.
What is the expansion ratio of the foam produced by the fixed low-expansion foam fire-extinguishing system of an engine room?
Less than 20 to 1.
Less than 5 to 1.
Greater than 20 to 1 but less than 50 to 1.
Less than 12 to 1.
What does the term “Dead Ship” mean?
“Dead Ship” means that the ship cannot make way through the water.
“Dead Ship” means that the ship is aground.
“Dead Ship” means that the machinery and boilers are inoperational due to lack of electrical power.
“Dead Ship” means that auxiliary machinery is not operational.
Some large slow speed diesel engines have jack bolt arrangements for retaining the main bearing top keep in place rather than the more conventional stud bolts. How does this arrangement affect the maintenance and checking procedures for the tie rods on the engine?
The tie rods should be fully tensioned before the jacking bolts are loaded to avoid overload of the bearing caps and frame structure.
The tie rods and jacking bolts must be tightened simultaneously to avoid excess load on either component.
The jacking bolts should be fully loaded before the tie rods are tensioned to avoid excess loads on the tie rods.
It has no effect since the tie rods and jacking bolts have completely separate functions.
Which of the following is not a principle of heat transfer utilised in an oil fired steam boiler?
Forced convection.
Conduction.
Radiation.
Natural convection.
While alongside at a repair berth a new section of seawater pipe has been fabricated in a shoreside workshop from drawings supplied by the vessel. During fitting of the pipe by ship’s engineers it is noted that the pipe is too short leaving a gap of about 8 mm between the flange faces. What action should be taken to remedy this problem?
The pipe should be returned to the shoreside workshop for modification or to be remade to the correct dimensions.
The ships engineer’s should use extra long bolts and pull the flanges together.
The ship’s engineers should fit extra thick joints between the flanges to fill the gap.
The ship’s engineers should manufacture a spacer piece to fit the gap.
What acton is required if the crankcase relief valve on an air compressor is operating and emitting an air and oil mixture?
Increase the lift pressure of the relief valve.
Overhaul the compressor unit.
Increase the flow of cooling water to the compressor and intercooler.
Place a drip can beneath the valve to collect any escaping oil.
You are starting to get low on water in the lifeboat. What should you do?
Use sea water.
Collect rain water.
Drink urine.
Mix sea water with 50 % fresh water.
What action should be taken by the engine room rating if a piece of machinery is not functioning properly?
If machinery does not function properly, the Chief Engineer should be called out immediately.
If machinery does not function properly, it should be immediately stopped every time.
If machinery does not function properly the duty Engineer should be informed immediately so that plans for further action can be made.
If machinery does not function properly, it should be stopped and serviced immediately.
For ideal synchronising as the incomer circuit breaker contacts make, the phase angle difference between the incomer e. m. f. and the busbar voltage should be:
90° lag.
30° ahead.
30° behind.
0°.
What do you understand by the order: “Move the pilot ladder to the other side?”
Move the pilot ladder to the other side, means: to move the pilot ladder further along nearer to the bow.
Move the pilot ladder to the other side, means: to rig another pilot ladder.
Move the pilot ladder to the other side, means: to change the position of the pilot ladder from the main deck to the fore deck.
Move the pilot ladder to the other side, means: to shift the pilot ladder to the opposite side of the ship.
For ideal synchronising as the incomer circuit breaker contacts make, the phase angle difference between the incomer e. m. f. and the busbar voltage should be:
30° behind.
0°.
90° lag.
30° ahead.
What are the lists called that give the position and task during a lifeboat drill for all persons on board the ship?
The Crew List.
The Muster List.
The Duty List.
The Drill List.
Why is it important to check the timing of diesel engine cylinder oil lubricators?
To ensure the piston is not covering the lubrication points and blocking the flow of cylinder lubricating oil into the cylinder.
To ensure the correct amount of cylinder lubricating oil is fed into the cylinders.
To ensure cylinder lubricating oil enters the cylinders when the piston is in the required position.
To avoid excess pressure in the cylinder lubrication system.
What is the correct name of the part highlighted in the illustration?
Push rod.
Connecting rod.
Main bearing.
Rocker Arm.
Which muscle is the most persevering one in the body?
The heart.
None of the mentioned.
The lungs.
The liver.
With regard to radar, what would be a correct form of response to the question: “What range scale are you using?”
The correct form of response would be: “I am using the 12 mile range scale”.
The correct form of response would be: “I am using the largest range scale”.
The correct form of response would be: “I am using the 10 cm radar”.
The correct form of response would be: “I am using the 3 cm radar”.
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 approximately the same thickness and 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 greater thickness and lower elasticity as the original diaphragm material.
Cotton reinforced rubber insertion sheet of approximately the same thickness but less elasticity than the original diaphragm material.
An air compressor is being refitted in the engine room. The compressor and motor are coupled using a flexible coupling and are mounted on a common “skid” which fixed to the deck with resilient mountings. Which of the statements, from the options given, relating to the alignment of the motor and compressor is true?
Shims should be fitted between the motor and compressor feet and the skid to ensure correct vertical, horizontal and parallel alignment of the coupling halves before it is bolted up.
As long as the two coupling halves are at the same height the flexible coupling will accommodate any horizontal misalingment of difference in the gap between the coupling faces.
The compressor and motor can just be placed directly on the common skid as they will probably be closely aligned anyway.
Machines using flexible couplings and resilient mountings do not need to be aligned. That is why they have flexible and resilient elements fitted.
A large electric motor is being removed from a main seawater pump with the aid of the engine room crane. Which is the best method of starting the lift from the options given?
Use the full hoist facility on the crane to “break” the motor free after slackening all of the retaining bolts.
Use the “inch up” facility on the crane to “break” the motor free after slackening all of the retaining bolts.
Use a suitable chain block suspended from the crane hook to “break” the motor free after slackening all of the retaining bolts.
Use the full hoist facility to lift the motor clear in one action after removing all of the retaining bolts.
What cooling medium is normally used to cool the condenser of a fresh water generator?
Air.
Seawater.
Brine.
Distillate (freshwater).
What is the correct name of the part highlighted in the illustration?
Crosshead.
Liner.
Bottom end bearing.
Connecting rod.
What is the main effect on lubricating oil of operating for long periods at excessively high temperature?
It will cause the oil to oxiside, increasing the viscosity.
It will cause the oil to oxidise, reducing the viscosity.
It will cause the oil to evaporate, increasing consumption.
It will change the flashpoint of the oil.
A ship moving through heavy seas is affected by the water presure at the bows causing an effect known as “Panting”. What structure in the forward region of the ship combats the effects of Panting?
Double bottom tanks and floors.
Panting beams and stringers.
Collision bulkhead and deck.
Centreline bulkhead.
Personnel in a high voltage switchroom smell ozone. Which of the following is the likely cause?
Air circuit breaker problems.
Arcing at badly connected bus bars.
Vacuum circuit breaker problems.
Transformer overload.
What do you understand by: “Let go the port anchor?”
Let go the port anchor means: slacken the port anchor cable.
Let go the port anchor means: put the port windlass brake in gear.
Let go the port anchor means: put the port windlass brake in gear and lower the anchor.
Let go the port anchor means: open the port windlass brake.
Which component does this graphical symbol illustrate?
PH analyzer.
Pressure indicator, installed on panel/console.
Pressure indicator, installed locally.
Pressure relief valve, self-contained.
What effect does an increased oil feed flow rate have on the performance of a centrifuge operating as a purifier?
Separating efficiency is unchanged.
Separating efficiency is increased, more water is removed.
Separating efficiency is increased, more solids are removed.
Separating efficiency is reduced.
A vapour compression refrigiration system is usually fitted with a number of devices to give protection and control of the system. Which of the methods given in the options should be used to test the high pressure cut out during routine maintenance and checking of the system?
Manually close each of the evaporator coils by switching off the electrical supply to the liquid line solenoid shut off valves and monitor the condenser pressure.
Close the condenser outlet valve and closely monitor the condenser pressure.
Gradually shut in the condenser cooling water valve or the condenser refrigerant inlet valve while closely monitoring the compressor discharge pressure.
Charge the system with refrigerant until the high pressure cut out operates.
Which of the following voltage levels would be regarded as high voltage likely to be found on a ship?
6,6 kV.
690 V.
660 kV.
220 V.
A mechanical seal, consisting of carbon and ceramic seal rings, is to be fitted to a centrifugal pump shaft. What is the most likely result of not being extremely carefull when fitting this type of seal?
The spring and bellows for the seal can be easily damaged.
The rubber O rings for the seal can be easily damaged.
The seal rings are hard and may score the pump shaft.
The seal rings are brittle and can be easily chipped or damaged.
Vibration analysis is often used as a conditioning monitoring tool onboard ship as part of the approved planned maintenance system. Many vibration measuring instruments are fitted with a harmonic filter/analyser. How would these filters normally be used during vibration measurement on a centrifugal pump?
To block out any noise or vibration from the surrounding engine room.
To generate an audible sound signal at the same frequency and amplitude as the vibration.
To isolate a single frequency of vibration associated with one of the pumps components.
To sum up all the harmonics of a base frequency to give total vibration for all of the pump’s components simultaneously.
What would the First Engineer require?
The First Engineer would require the Chief Officer to keep him advised of bilge soundings.
The First Engineer would require the Fitter to check the carbon dioxide fire-fighting equipment.
The First Engineer would require cleaning of the feed water tank.
The First Engineer would require an inspection of the heating coils.
Thermistors are temperature sensitive devices. A positive temperature coefficient thermistor will typically have:
Relatively linear characteristic.
Inaccurate measurement.
Relatively non linear characteristic.
Variable reliability.
What is the correct method to use for fitting a rolling contact bearing, such as a ball bearing, onto a parallel shaft?
Use a hammer and a pipe with the same diameter as the inner bearing ring and knock the bearing onto the shaft.
Use emery cloth on the bearing surface on the shaft.
Use emery cloth on the inner ring (contact surface) of the bearing.
Gently heat the bearing in an oil bath and use a bearing puller to draw it onto the shaft.
What is the most important task after carrying out any major overhaul on a diesel engine?
Start the auxiliary blower to ventilate the engine so that it has sufficient fresh air for starting.
Start the engine to check the direction of rotation.
A thorough check inside the engine to make sure all tools and cleaning rags have been removed.
Repair any damaged paint work on the engine.
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 soaked with oil and catch fire.
The rags may be caught by running machinery or power tools.
The correct time to synchronise is usually taken to be when the synchroscope reaches the “5 to 12” position and is rotating slowly clockwise. This to allow for:
Synchroscope error.
Generator phase difference error.
Circuit breaker operating time.
Synchroscope pointer time lag.
The two instruments necessary for generator synchonising are:
kW meter and frequency meter.
Voltmeter and synchroscope.
Synchroscope and kVar-meter.
Amp-meter and volt-meter.
What is the meaning of “make fast”?
To act quickly.
To avoid all meals.
To secure a rope.
To coil a rope.
How many separate means of escape are provided from each fire zone above the bulkhead deck?
One.
At least two.
At least three.
At least ten.
A seawater pump requires overhaul but there are no spare wear rings for the casing and impeller. It is decided that new wear rings will be fabricated onboard using the ship’s lathe. What would be the most suitable material to use to fabricate the rings onboard?
Mild steel.
Zinc.
Aluminium.
Aluminium brass.
A ship has a medium speed engine and a controllable pitch propeller propulsion system. What would the propeller pitch normally have to be at to allow starting of the engine?
10 % ahead.
25 % ahead.
25 % astern.
Zero.
Many large slow speed diesel engines operating on heavy fuel oil have a fuel injection system which features Variable Injection Timing. How does this affect engine operation?
VIT increases engine efficiency by automatically maintaining the maximum cylinder pressure over the entire load range.
VIT increases engine efficiency by automatically maintaining the maximum cylinder pressure over part of the load range.
VIT improves engine operation by automatically controlling the start of fuel injection when it detects a poor quality fuel.
VIT allows the ship’s engineers to alter the injection timing for each load setting with a simple single adjustment of the fuel rack.
How many Radar Transponders (SART) are required to be carried onboard a ship for use in survival crafts?
One in each lifeboat.
2, one of which being capable of floating free if the ship sinks.
Two on each side of the ship.
One on each side of the ship.
A mechanical seal, consisting of carbon and ceramic seal rings, is to be fitted to a centrifugal pump shaft. What is the most likely result of not being extremely careful when fitting this type of seal?
The seal rings are hard and may score the pump shaft.
The spring and bellows for the seal can be easily damaged.
The seal rings are brittle and can be easily chipped or damaged.
The rubber O rings for the seal can be easily damaged.
Which of the options represents the best action to take when an item of machinery, which normally operates in automatic mode, is operated in “manual” mode?
Keep the Chief Engineer informed of machines performance on an hourly basis.
Have someone permanently stationed at the machine in case of an operational problem.
Monitor the operation of the machinery on a frequent basis.
Change over all other machinery to manual mode of operation.
What type of component does this graphical symbol illustrate?
Pressure-reducing regulator.
Pressure switch.
Pressure relief valve.
Flow controller.
Under what circumstances would you remove guards and safety devices from machinery?
To allow the shaft to be seen to confirm the machine is running.
When they are rattling and vibrating.
During overhaul and maintenance procedures.
When the safety devices keep stopping the machinery.
What is generally considered as the minimum safe time period before opening a crankcase door after the oil mist detector alarm has activated and the engine has been stopped?
After at least 20 minutes.
After at least 5 minutes.
After at least 1 hour.
After at least 10 minutes.
B Class divisions in ships are constructed so that they are capable of preventing the passage of flame to the end of a standard fire test held for:
30 minutes.
15 minutes.
60 minutes.
45 minutes.
This device can detect a package of drugs inside a large delivery of ship’s stores. What is it?
Security container.
Pallet scanner.
Access control system.
Vapour detector.
What is the period of validity of the Safety Management Certificate?
1 year.
5 years.
6 months.
2 years.
Which of the following alternatives summarise the benefits of using high voltage on ships?
Smaller conductors, machines and switchgear.
Smaller conductors, insulators and transformers.
Smaller cables and better power factors.
More efficient transformers and electrical machines.
An important quantity which is useful in circuit analysis is known as conductance G (Siemens). Which of the formulas A to D expresses the conductance for this circuit?
G = 1/R.
G = 2R.
G = R·V.
G = I/R.
In a low pressure auxiliary boiler, what would be considered to be the maximum allowable chloride level of the boiler water?
600 PPM.
1 000 PPM.
300 PPM.
50 PPM.
When you are calibrating an instrument what is the most common second step in the procedure?
Adjustment of Zero-point.
Check linearity.
Adjustment of range.
Adjustment of span.
Which of the following instruments is normally part of a control-loop?
Transducer.
Plotter.
Gauge.
Indicator.
What is one of the main features of the cylinder lubricating oil used in large 2 stroke marine diesel engines which normally operate on heavy fuel oil?
It is neutral with a pH value of 7.
It is a pure mineral oil without any special additives.
It is strongly acidic.
It is strongly alkaline.
The mandatory color of a hand flare is:
Yellow.
Red.
Green.
White.
The circuit consists of two inductors, L(1) = 6 H and L(2) = 12 H, connected in parallel. Calculate the equivalent L(S) of the two inductors.
L(S) = 18 H.
L(S) = 0,667 H.
L(S) = 1,5 H.
L(S) = 4 H.
What could cause diesel engine lubricating oil to appear cloudy with a slightly “milky” colour?
Fuel contamination of the system.
Oxidation of the oil.
High temperature of the oil.
Water contamination of the system.
Many large 2 stroke marine diesel engines are equipped with an auxiliary scavenge air blower. What is the purpose of this equipment?
To provide combustion air at start up, during manoeuvring and low load running when the turbocharger delivery is insufficient.
To allow full load running when the main turbocharger is defective.
To assist the main turbochargers in supplying combustion air when on full load.
To help cool the engine after it has been stopped.
Is it necessary to cool the samples taken from a diesel engine cooling water system before carrying out tests to determine the concentration of treatment chemicals?
No, the test should be carried out at system temperature.
Yes, the samples should be cooled to approximately 25 °C.
Yes, the samples should be cooled to approximately 50 °C.
No, the samples should be heated to approximately 95 °C.
During maintenance work on a main diesel engine the fuel injection valve is found to be jammed in the pocket in the cylinder cover. Which of the procedures given in the options should be followed in order to complete the work?
Wedge a bar between the piston top and the bottom of the injector and use the turning gear to force the injection valve out.
Replace the complete cylinder cover with a spare unit and land the cover with the jammed valve ashore for repair in a specialist workshop.
Remove the cylinder cover and try and drive the injection valve out of the pocket from the underside with a hammer and punch.
With the fuel injection valve retaining nuts removed admit compressed air into the engine cylinder to try and blow the injection valve out of the pocket.
New MARPOL regulations came into effect from July 93 stating that the previous instantaneous rate of discharge of oil content (60 litters per nautical mile) was changed to:
10 litters per nautical mile.
25 litters per nautical mile.
30 litters per nautical mile.
20 litters per nautical mile.
A flame detector is activated by:
Smoke, gas, sparks and high temperature.
The radiation of heat given off by flames.
The rise of the environment temperature.
The infrared radiation and ultraviolet radiation given off by flames.
Before leaving the machinery spaces of a UMS vessel after routine watchkeeping rounds in the evening, the duty engineer inspects the doors to Fuel Oil Treatment rooms which are covered by a fixed fire fighting installation. For what purpose does he do this?
To tie them open with a rope to prevent the heat from building up inside, and making it uncomfortable to work.
Remove the auto closing device so they remain in whatever position.
Wedge them open with an arrangement which allows them to be closed quickly in the event of a fire.
To make sure that they are properly closed with the self closing device so that any fire is contained and the extinguishing medium can be released without delay.
What is the correct name of the part highlighted in the illustration?
Push rod.
Crankshaft.
Camshaft.
Connecting rod.
Select the option which best describes the primary duty of a watch-keeping engineer:
The primary duty of a watch-keeping engineer is to maintain constant surveillance of the main engine and auxiliary machinery.
The primary duty of a watch-keeping engineer is to maintain the ship’s speed.
The primary duty of a watch-keeping engineer is to ensure that machinery spaces are properly manned.
The primary duty of a watch-keeping engineer is to maintain constant surveillance of the steering gear.
The exhaust gas temperatures of all cylinders of a diesel engine are seen to be high. Select, from the options given, the most likely cause of this:
Insufficient cooling of the main bearings.
Poor fuel oil quality.
High wear rate in one of the fuel injection pumps.
One of the fuel cams is worn.
During a bomb search, which of the following is an important principle to follow?
Throw any suspicious items overboard.
Try to reach behind bulkheads to find a bomb.
Do not touch any suspicious packages.
Know exactly what a bomb looks like.
An electrical power emergency source in a ship is required because:
It satisfies the SOLAS requirements for ship safety.
The main diesel generator(s) can be taken out of service for overhaul or repair.
It satisfies the need to be environmentally “friendly”.
The ships total load can be shared between main and emergency generators.
Give the meaning of the following symbol:
Indicates manual starting direction of the engine.
Start water spray.
Reverse engine.
Start engine.
Why is it important to check the timing of diesel engine cylinder oil lubricators?
To ensure the piston is not covering the lubrication points and blocking the flow of cylinder lubricating oil into the cylinder.
To ensure cylinder lubricating oil enters the cylinders when the piston is in the required position.
To ensure the correct amount of cylinder lubricating oil is fed into the cylinders.
To avoid excess pressure in the cylinder lubrication system.
The subject “Engine, Operational, Slow Speed” covers both theoretical and practical aspects of safely working with electrical equipment. Mastery of this material is a direct indicator of an employee’s competence in holding a relevant position aboard a vessel. A sailor in the engine department is responsible for maintaining and adjusting engine components, cooling systems, fuel delivery systems, and other related equipment. They are also tasked with monitoring the operation of all machinery, carrying out regular technical inspections, and performing necessary repairs. When handling a low-speed control system (SU), the sailor ensures precise and safe navigation of the vessel, following the captain’s instructions and navigational charts.
- Test type: STCW.
- Version: 6.0.0, 6.0.13.
- Department: Engine.
- Level: Operational.
- Engine: Slow speed.
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