Maison Tests en ligne CES Slow Speed 3rd-Eng/4rd-Eng Test for specialists working in Engine room (CES v6.0)

Tests en ligne : Test for specialists working in Engine room (CES v6.0)

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Le test comprend 80 questions aléatoires.
Total de questions sur ce sujet : 147

Question 1 depuis 80

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.

What is the correct name of the part highlighted in the illustration?

Push rod.

Connecting rod.

Main bearing.

Rocker Arm.

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.

Which muscle is the most persevering one in the body?

The heart.

None of the mentioned.

The lungs.

The liver.

Modern slow speed, two stroke diesel engines often have locating pins or pegs to keep the piston rings in a fixed position. Why is this arrangement used?

The piston ring gaps can be kept in line to control the gas pressure on each of the rings.

The piston rings are more difficult to lubricate because of the slow operating speeds and will wear more quickly if they are allowed to rotate.

It avoids the risk of the ends of the piston rings being forced out by the gas pressure and catching on the scavenge ports.

It ensures the rings cannot be mixed up and that they are fitted in the correct order on the piston.

What is the correct name of the tool shown in the illustration?

Flat file.

Chisel.

Pliers.

Grinding machine.

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.

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”.

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 meaning of “make fast”?

To act quickly.

To avoid all meals.

To secure a rope.

To coil a rope.

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.

Which part of the crankshaft of a modern large two stroke diesel engine is most likely to be the origin point for crack initiation during service and therefore needs the greatest attention during maintenance inspection?

The oil holes.

The keyways.

The fillet radii.

The dowel pins and dowel holes.

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.

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.

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 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.

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.

What is the correct name of the tool shown in the illustration?

Pliers.

Adjustable wrench.

Chisel.

Open end wrench.

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.

Overfill the governor with fresh oil to force all of the air out.

Drain the governor again and slowly refill with fresh oil.

With the governor in operation close the compensation needle valve and disturb the load to make the engine hunt.

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.

What is the ideal working temperature for physical work?

-10 °C.

10-15 °C.

21-35 °C.

17-20 °C.

For a Nitrite – Borate based cooling water treatment system, what would be considered to be the normal nitrite concentration limits for a correctly dosed system?

3 000 – 4 500 ppm Nitrite.

1 500 – 3 000 ppm Nitrite.

0 – 1 500 ppm Nitrite.

4 500 – 6 000 ppm Nitrite.

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.

What is the disadvantage of using chemicals on an oil-spill on the water?

It is difficult to apply the chemicals if the oil drifts away from the ship’s side.

The chemicals make it difficult to remove the oil from the water.

It is difficult to apply chemicals if there is any wind.

The water gets a white colour, which makes it easy to detect the oil-spill.

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.

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.

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.

Where would you find out which fire sections are enclosed by “A” or “B” class divisions on a ship?

All the mentioned alternatives.

On the general arrangement plan.

On the capacity plan.

On the Ship’s fire control plans.

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.

What is likely to be the cause of black smoke from a diesel engine exhaust seen at the funnel?

Engine is burning some lubricating oil.

Too much combustion air.

Incomplete combustion of the fuel.

Water in the fuel.

If a refrigeration system contains air, how would you remove it from the system?

Pump the system down to the evaporator and keep the fan running until the evaporator is at ambient temperature and vent off the air from the top of the evaporator.

Stop the compressor and vent the air from the crankcase.

Pump the system down to the condenser, continue cooling water flow until the condenser is at the same temperature as the cooling water and vent off the air from the top of the condenser.

Stop the compressor and undo a pipe coupling at the highest point in the system to vent off the air.

What is the purpose of the ODME (Oil Discharge Monitoring Equipment) printer?

To prove that oil has been pumped overboard according to regulations.

To prove fault conditions in the ODME.

None of the mentioned.

To prove that the ODME system has been used.

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.

Thermistors are temperature sensitive devices. A positive temperature coefficient thermistor will typically have:

Relatively linear characteristic.

Inaccurate measurement.

Relatively non linear characteristic.

Variable reliability.

It is common practice to connect a resistor over an alarm contact (see diagram) in many applications. Why is this connection used?

To monitor the cable/wires for break.

To stabilise power consumption.

To avoid sparks on the contacts when opening and closing.

Enable measuring the total resistance of the circuit.

On some large slow speed engines the crosshead guides are adjustable to allow the clearance between the crosshead shoes and the guides to be set equally. The normal arrangement is to have bolted on guide bars with shims fitted behind them. Which of the methods given in the options is the one normally used to ensure this is done correctly?

Fit an equal number of shims behind each guide bar which should result in equal clearances between the guide bars and shoes along the whole length.

Turn the engine so that the piston for the cylinder concerned is at TDC and measure the clearance along the length of each bar and shoe and fit shims to equalise the clearances.

Turn the engine so that the piston skirt is at the bottom of the liner. Use wedges to centralise the piston. Measure the clearances along the length of each bar and shoe and fit shims to equalise the clearances.

Turn the engine so that the piston for the cylinder concerned is at BDC and measure the clearance along the length of each bar and shoe and fit shims to equalise the clearances.

What is the correct name of the part highlighted in the illustration?

Crosshead.

Liner.

Bottom end bearing.

Connecting rod.

An auxiliary engine is fitted with a duplex type lubricating oil filter. The in-use element requires changing. What procedure should be used to fit the new element?

With the engine running, position the changeover cock so that both filters are in use to reduce the pressure before.

With the engine running, shut off the filter inlet and quickly fit the new element.

The engine must be stopped to fit a clean filter element.

With the engine running, change over to the other filter after priming it and replace the dirty element after checking there is no pressure on dirty filter housing.

What is the main reason for keeping engine lubricating oil viscosity within recommended limits?

To reduce system pressure losses.

To ensure the strength of the oil film is sufficient to keep lubricated surfaces apart.

It is not important.

To neutralise any acids that may form.

Which one of the listed requirements regarding the stowage of a survival craft corresponds to present SOLAS regulations? Each survival craft shall be stowed:

In a secure and sheltered position and protected from damage by fire or explosion.

Wherever space is available.

In a state of readiness so that two crew-members can prepare for embarkation and launching in less than 15 minutes.

On the starboard side of the ship.

The mandatory color of a hand flare is:

Yellow.

Red.

Green.

White.

Which component does this graphical symbol illustrate?

PH analyzer.

Pressure indicator, installed on panel/console.

Pressure indicator, installed locally.

Pressure relief valve, self-contained.

For two generators running in parallel, their share of additional load (kW) will be determined by the:

Voltage droop setting on each AVR.

Governor droop settings on each prime mover.

The temperature difference between the generator rotors.

The power factor of the additional load.

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.

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.

Which ships does the ISM code apply to?

Only passenger vessels.

All passenger ships, all cargo ships of 500 GRT or above.

Only tankers and Ro-ros.

All craft above 300 GRT.

In a purifier assuming the separating temperature is correct, what is the probable cause of the processed oil containing water?

The back pressure at the clean oil outlet is too high.

The gravity disc is too small and/or the flow rate is too high.

The throughput is too low.

The gravity is too large.

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.

After main power is restored (following a blackout), a timed sequential restart of motor driven auxiliaries is necessary to avoid:

Generator overload due to many motors starting at simultaneously.

Overvoltage due to current surges.

Overloading creating earth faults.

Over-frequency due to overspeed of generator.

What is the correct name of the part highlighted in the illustration?

Push rod.

Crankshaft.

Camshaft.

Connecting rod.

What is meant by the term “feel over sequence” as applied to diesel engine operation following replacement of a crankshaft bearing?

Stopping the engine to check the bearing temperature after a short period of operation and repeating this procedure at increasing running intervals.

Running the engine at low load and gradually increasing the load over a period of 12 hours.

Stop the engine after 2 hours running to check the bearing temperature by running the hand over it.

Give the meaning of the following symbol:

Indicates manual starting direction of the engine.

Start water spray.

Reverse engine.

Start engine.

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 diagram is the symbol for a THYRISTOR?

Figure 3.

Figure 4.

Figure 2.

Figure 1.

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.

What do you understand by: Bitter end?

Bitter end means: the end link of an anchor cable that is secured within the chain locker.

Bitter end means: a foul taste at the end of a meal.

Bitter end means: to the very last moment.

Bitter end means: the toggled end of a lifeboat painter.

What type of construction material should be avoided regarding fire protection purposes? (SOLAS II-2/2.2.3).

All combustible materials.

All uncovered wooden materials.

All composite materials.

All plastic materials.

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.

What is the correct name of the part highlighted in the illustration?

Exhaust valve.

Fuel injector.

Air inlet valve.

Air starting valve.

Personnel in a high voltage switchroom and smell rotten eggs. What may this indicate?

Burning of insulation.

Arcing at badly coupled bus bars.

Problems with a vacuum circuit breaker.

Problems with a gas (SF6) circuit breaker.

What would be the correct form of response to the question: “What kind of assistance do you require?”

The correct form of response would be: “There is a fire onboard my vessel”.

The correct form of response would be: “My vessel has a fire in the accommodation and we require fire-fighting assistance”.

The correct form of response would be: “I need help on board with a fire and the smoke is very toxic”.

The correct form of response would be: “I need help as soon as possible”.

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.

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.

During an unmanned period on a UMS vessel the “low water level” alarm for the jacket cooling water system expansion tank activates. What action would you take as duty engineer?

Answer the alarm then block the alarm and change to manned engine room condition.

Answer the alarm then block the alarm function for later action and resume unmanned operation.

Answer the alarm and adjust the alarm set point for the water level in the expansion tank before resuming unmanned operation.

Answer the alarm, top up the tank and check the system for leakage before resuming unmanned operation.

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 correct name of the tool shown in the illustration?

Pliers.

Chisel.

Monkey wrench.

Padlock.

Under which circumstances should a sprinkler head of a common fixed sprinkler fire-extinguishing system be activated?

When the smoke density exceeds 12,5 % obscuration per minute, but after the corresponding alarm is acknowledged and assessed at the control panel.

When the temperature is within a range from 68 °C to 79 °C, but after the corresponding alarm is acknowledged and assessed at the control panel.

Automatically, when the temperature is within a range from 68 °C to 79 °C.

Automatically, when the smoke density exceeds 12,5 % obscuration per meter.

What is the most important task after carrying out any major overhaul on a diesel engine?

Start the engine to check the direction of rotation.

Repair any damaged paint work on the engine.

A thorough check inside the engine to make sure all tools and cleaning rags have been removed.

Start the auxiliary blower to ventilate the engine so that it has sufficient fresh air for starting.

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 is the correct name of the tool shown in the illustration?

Water Pump Pliers.

Adjustable wrench.

Flexible pipe.

Padlock.

Which of the following instruments is normally part of a control-loop?

Transducer.

Plotter.

Gauge.

Indicator.

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 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.

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.

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.