Тест состоит из 80 случайных вопросов.
Всего вопросов по данной теме: 147
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.
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.
When a ships derrick or crane lifts a weight off the deck of a ship, from which position can the centre of gravity of the weight be considered to act?
From the centre of the weight lifted.
From the position on the deck from which the weight was lifted.
From a position on the deck at the base of the derrick or crane.
From the head of the derrick or crane.
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.
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.
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 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.
High wear rate in one of the fuel injection pumps.
One of the fuel cams is worn.
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.
A power card taken from a diesel engine cylinder using a mechanical indicator has a flat top. Which of the possible actions given in the options is most likely to correct this irregularity on the power card?
Lengthen the cord for the indicator drum drive.
Change the indicator spring for one with a higher rating.
Shorten the cord for the indicator drum drive.
Lubricate the indicator piston and cylinder.
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 10 minutes.
When you join a new ship, how are you informed about safety rules, alarm instructions and your own duties in case of an emergency?
By folder distributed to each crewmember.
By muster list exhibited in conspicuous places.
By alarm instructions in all crew cabins.
By oral instructions by the Captain.
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.
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 correct name of the part highlighted in the illustration?
What is the meaning of “make fast”?
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.
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 correct name of the tool shown in the illustration?
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.
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.
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.
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 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 the correct name of the part highlighted in the illustration?
What is the correct name of the part highlighted in the illustration?
What could be the cause of a refrigeration compressor running continuously even though normal temperatures for the cold rooms have been reached?
Solenoid valve before the expansion valve stuck in closed position.
High-pressure cut-out is stuck in open position.
The differential pressure switch for the lubricating oil pressure cut-out is stuck in the closed position.
Low-pressure cut-out is stuck in closed position.
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.
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:
Is it always possible to use the word “ship” instead of the word “boat”?
A large vessel is always called a “ship” and never a “boat”.
Normally a small vessel is called a “boat” rather than a “ship”, otherwise it is not important.
Either can be used anytime.
A boat can only be used for vessels under 50 metres in length.
A detector that is activated by a rise of temperature is:
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 period of validity of the Safety Management Certificate?
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 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.
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.
In a low pressure auxiliary boiler, what would be considered to be the maximum allowable chloride level of the boiler water?
In a diesel engine lubrication system the circulating pump normally takes suction from the oil sump tank. Where would the oil normally pass to directly after the pump?
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.
What is the correct name of the tool shown in the illustration?
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.
What do you call the wide rung on a pilot ladder that prevents the ladder from twisting?
The wide rung on a pilot ladder that prevents it from twisting is called a “Spreader”.
The wide rung on a pilot ladder that prevents it from twisting is called a “Wide step”.
The wide rung on a pilot ladder that prevents it from twisting is called a “Long rung”.
The wide rung on a pilot ladder that prevents it from twisting is called a “Ani-twist rung”.
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.
How many separate means of escape are provided from each fire zone above the bulkhead deck?
The responsibility for safety and security rests with everybody on board the vessel. General house-keeping rules should be followed. Which of the listed rules is the most important?
Do not carry lighters or matches when working outdoors.
Always use gloves when using grinding machines.
Keep tools within easy reach during work.
Keep your working area clean and tidy.
You are witnessing someone about to faint. What are the symptoms?
The person may be very pale, and pulse is slow at first and weak.
The pulse is very fast and the person is getting cold.
The person starts to talk a lot and seems superactive.
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.
This device can detect a package of drugs inside a large delivery of ship’s stores. What is it?
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:
What is the correct name of the tool shown in the illustration?
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.
To prove that the ODME system has been used.
On finding a person apparently unconscious in a High Voltage switch room, which of the following should be done?
Raise alarm then drag the victim clear so that they cannot reach live parts while receiving aid.
Check if the victim is in contact with live parts and if not apply first aid.
Raise alarm, identify means of isolation and apply before approaching victim.
Trip all breakers and approach victim.
During maintenance of a piston rod stuffing box on a large, slow speed diesel engine it is usual to measure the butt gaps between the sealing ring and scrapper ring segments. What would be the effect of these gaps being too small?
If the gaps are too small the rings could scope the piston rod.
If the gaps are too small they could close due to the radial wear of the rings before the next scheduled overhaul preventing the rings from contacting the piston rod and sealing it.
If the gaps are too small then the flow of scavenge air through the gland would be reduced and the gland would overheat.
If the gaps were too small then no oil could pass up the piston rod to lubricate the sealing rings.
What is the correct name of the part highlighted in the illustration?
With two alternators running in parallel, and one is to be disconnected. The first step is to:
Remove the load from the alternator to be stopped.
Increase the frequency on the switchboard.
Trip the main circuit breaker.
Make sure the load is evenly shared.
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.
What type of component does this graphical symbol illustrate?
Pressure-reducing regulator.
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.
Which of the following fittings shall be provided to all lifeboats?
A manually controlled lamp fitted on the outside.
A remotely operated steering arrangement.
An electric power starting system for the propulsion engine with one rechargeable energy source.
Permanent boarding arrangements on both sides to enable persons in the water to board the lifeboat.
What will be the probable outcome if the amplification is set too high on a controller?
The process will oscillate and get out of control.
The set-point will change.
The process response will be very slow.
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.
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.
Wedge them open with an arrangement which allows them to be closed quickly in the event of a fire.quickly.
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.
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 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.
It is recommended that every prospective seafarer should, before being employed in a sea-going ship, receive proper training in personal survival techniques. In respect of such training several recommendations are made. Answer the question: “To whom should training in personal survival techniques be given?”
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.
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.
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.
Which of the following instruments is normally part of a control-loop?
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.
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 Ship’s fire control plans.
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:
Which diagram is the symbol for a THYRISTOR?
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.
Which ships does the ISM code apply to?
All passenger ships, all cargo ships of 500 GRT or above.
What could cause diesel engine lubricating oil to appear cloudy with a slightly “milky” colour?
Fuel contamination of the system.
High temperature of the oil.
Water contamination of the system.
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?
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.
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.
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.
When a fire breaks out in the accommodation, cargo holds or on deck, who is in charge of the fire fighting operations?
The first officer arriving at the scene.
The first person arriving at the scene.
The person who is designated in the muster list.