Der Test besteht aus 80 zufälligen Fragen.
Gesamtzahl der Fragen zu diesem Thema: 118
A ship’s electrical system operates at 60 Hz, but when connected to shore supply it is supplied with 50 Hz. Which of the following would you expect?
Electric motors will run at reduced speed, and will tend to overheat.
Earth faults are more likely.
Electric motors will run at increased speed and will tend to overheat.
Generators are more sensitive to reverse power faults.
Why is it important that the correct tension is maintained in a diesel engine timing chain?
Correct tension ensures that the chain and associated equipment is within normal loading limits.
Correct tension ensures that there is absolutely no vibration in the chain.
Correct tension ensures that the fuel and valve timing are correct.
Correct tension ensures that the chain is correctly lubricated.
The charge air pressure supplied to a diesel engine, which is normally 2,0 bar, is reduced to 1,5 bar. What will be the likely effect on the engine operation?
The performance of the engine will be reduced noticeably.
The performance of the engine will be similar to normal conditions.
The turbochargers cooling water flow will increase.
The cylinder cooling water flow will increase.
In which of the following automated control processes will the time constant be of minor importance?
Who is responsible for ensuring that your ship’s security plan meets the requirements of the ISPS Code?
Recognized Security Organization.
Flag State Administration.
Company Security Officer.
A two step controller (open/close) has failed and the only available spare controller is a P+I controller. Select, from the options given, how the P+I controller could be set up to achieve approximate two step control.
Set the proportional band to maximum width and the integral action to minimum (repeats per minute).
Set the proportional band to minimum width and the integral action to maximum (repeats per minute).
Set the proportional band to minimum width and the integral action to minimum (repeats per minute).
You are in charge of a night bunkering operation. The delivery rate from the supplier is high and you are filling six tanks simultaneously. You lose track of the progress of the operation and feel that you are losing control of the situation. What action should you take?
Stop bunkering, and establish facts, before bunkering is resumed.
Open more tanks to slow down the filling rate of individual tanks.
Prepare yourself and the crew for an overflow.
Request a reduction in the delivery rate to try and gain some time.
Why is it necessary to have an effective ballast water management plan which includes provision for changing out ballast in open water rather than discharging ballast in coastal waters?
To avoid the introduction of non-indigenous species of marine life from one area to another.
To keep the ballast water fresh in the ballast tanks during long voyages.
To allow ballast tank inspections to be carried out during ballast passage.
To ensure that ballast tanks are always pressed up during a ballast voyage to avoid free surface effects.
The operating mode of a pyrotechnic signal depends essentially on:
Instructions or diagrams printed on its casing by the manufacturer.
The weather conditions of the moment.
The fact that the user is on board a liferaft, a lifeboat or ship.
A definite standard process.
Some diesel engines have alarm and slow down protection in the event of a fire in the scavenge boxes. Choose the option which would be a typical set point for giving a slow down of the engine in the event of a scavenge box fire?
Which of the options given is likely to be the reason for a drop in the charge air manifold pressure of a diesel engine operating with an exhaust gas turbocharger?
Insufficient cooling of the charge air.
Engine room exhaust fans stopped.
Exhaust gas boiler fouled.
A draw card obtained from a cylinder of a large 2 stroke diesel engine shows that both cylinder compression and maximum pressures are low. Cards from other cylinders indicate normal operation. What is the likely cause of this problem?
Faulty cylinder component (piston rings, liner, etc.).
Excessive cooling of the charge air.
Faulty high pressure fuel pump.
The fuel consumption for the main diesel engine has gradually increased over a period of a few months. All system pressures and temperatures appear normal. From the options given, choose the one which is the most likely cause of this:
Sea water temperature changing.
A medium speed diesel engine which is supported on a steel chocking system has had repeated problems with two of the chocks at the end of the engine on the port side becoming slack. This has led to some fretting damage to the bedplate and tank top in that area. What action should be taken to affect a cost effective permanent repair?
Tighten the holding down bolts in that area to 150 % recommended load to prevent further slackening and fretting.
Replace the complete steel chocking system with one using resilient mounts to accommodate movement and avoid further incidents of fretting.
Replace the damaged chocks with resin based chocks of an appropriate size.
Replace the complete steel chocking system with a resin based system.
Which of the following symptoms would indicate that the filter drier in a refrigeration circuit has become blocked?
A large temperature drop across the drier.
A hammering noise from the compressors.
A hammering noise from the drier.
A pressure rise before the drier.
The fuel tank contents gauges onboard a vessel are of the air bubble and bell type. The gauges are calibrated for a different fuel type to the actual fuel in the tanks. When correcting the actual contents of the tanks from the gauge readings which of the parameters given in the options is the most important?
A transformer overheats while taking a shore supply. Which is the likely cause?
Two reference points for pressure exist, absolute zero and atmospheric pressure. What are pressures measured relative to absolute zero called:
The temperature control for a hot water system is very erratic with the temperature gradually rising and then suddenly falling and vice versa even though system demand is fairly constant. Which of the options given is the most likely cause of this problem?
Control valve gland is over tightened.
Controller integral action reset time is too fast.
Control valve actuator diaphragm is ruptured.
Control air pressure supply is too low.
Some ships generate electrical power at 440 V, but then step up this voltage to supply specific electrical equipment. One common example, may be to feed a large bow thruster. Why is this done?
The overall ship’s electrical load does not justify a High Voltage generating plant. This method allows more power to be delivered to the bow thruster at low running cost.
Manufacturers can supply High Voltage bow thrusters at less cost, and the power factor is improved.
A large bow thruster will draw very large currents at low voltage. Being typically remote from the generator, significant voltage drops would occur at low voltage.
The shipyard could not purchase a High Voltage generating plant at the time of manufacture, so they used what was available at the time.
How does the maximum oil film pressure in a white metal journal bearing operating under full fluid film conditions compare with the pressure of the lubricating oil supply system?
The pressure is greater than the pressure in the lubricating system and varies with the journal load.
The pressure is the same as the pressure in the lubricating system regardless of the journal load.
The pressure is greater than the pressure in the lubrication and is constant regardless of the journal load.
The pressure is less than the pressure in the lubricating system and varies with the journal load.
The pyrotechnics used to transmit visual signals to other vessels, boats or aircrafts are of the following type:
All of the below mentioned.
When performing electrical testing of a three phase motor, insulation resistance measurements may be influenced by which of the following?
Temperature, humidity and surface contamination.
Humidity, frequency and dampness.
Humidity, pressure and surface contamination.
Between 0,1 micro Ohm and 1,0 micro Ohm.
What is the advantage of a transmitter with a narrow measurement range?
Do not need any calibration.
Better linearity and increased accuracy.
When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?
100 % output is accurate, but Zero-point is wrong.
Zero-point and 100 % are correct, but not at mid-range.
Zero-point is accurate, but 100 % input is not giving 100 % output.
Sometimes an early warning of failure in High Voltage switchboards may be an unpleasant smell. If the switchboard uses gas circuit breakers, which of the following may indicate a potential problem?
When the cable length exceeds approx. 10 meters we normally have to, in case of a Pt 100, in some way compensate for the cable resistance. Do we also have to do this if we choose to use a T802 temperature sensor?
Depends on temperature to be measured.
What is the best way to avoid pollution from small oil-spills aboard a ship?
Contain any oil-spill onboard the ship.
Have dispersing chemicals ready for use in case of oil-spill.
Rig an oil boom around the ship.
Have sawdust ready for use.
A two step controller (open/close) has failed and the only available spare controller is a P+I controller. Select, from the options given, how the P+I controller could be set up to achieve approximate two step control.
Set the proportional band to maximum width and the integral action to minimum (repeats per minute).
Set the proportional band to minimum width and the integral action to minimum (repeats per minute).
Set the proportional band to minimum width and the integral action to maximum (repeats per minute).
Set the proportional band to maximum width and the integral action to maximum (repeats per minute).
A transformer overheats while taking a shore supply. Which is the likely cause?
The circuit diagrams illustrate four different methods of wiring between a Pt 100 temperature sensor and its signal processing electronics. Which of the wiring methods gives the best measuring accuracy?
When considering instrumentation systems, what is the meaning of the expression “dead-band”?
The controller will not react to a process change in this range.
It will take some time before the controller will react to a change.
The controller will enter “sleep mode”.
The controller will not respond to adjustment of set-point.
In what kind of measuring equipment might we find a Bourdon-tube?
In a pressure transmitter.
In a temperature transmitter.
When starting three phase induction motors there is sometimes a need to use a star-delta starter. A star-delta starter exhibits the following characteristics while connected in a star.
Reduced current and increased voltage.
Reduced current and reduced torque.
Increased current and power.
Reduced current and increased speed.
What should be the healthy continuity resistance of a 220V, 2,2kW, 10A heating element, when checked near to it’s rated operating temperature?
A galley hot plate uses a Nichrome/Magnesium Oxide heating element, and is to be tested before being put into service for the first time. An insulation resistance test yields a reading of 0,3 M Ohm. Which action should be taken?
Put the element into service.
Wash the element in a degreaser agent. Then retest, and if ok put it into service.
Apply reduced voltage to the element for a few minutes. Then retest, and if ok put into service.
The turbocharger on a diesel engine is surging. Which one of the following options would be the most likely cause?
Dirty scavenging air cooler on the air side.
Dirty rotor blades and nozzle ring.
The lubrication oil pump is malfunctioning.
Worn out bearings on the turbocharger.
What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?
Impact pressure forces in way of abrupt or flared bow.
Forces created by waves on the forecastle.
Slamming in way of flat bottom forward of light draught.
Pressure forces caused by green water on deck.
After a couple of hours of operation the failure alarm sounds for a heavier 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 clutch for the drive shaft is worn and slipping.
The purifier bowl has not closed properly.
Continuity testing of a delta connected three phase induction motor yields the following results; U1-V1 = 4 Ohms, V1-W1 = 4 Ohms, W1-U1 = 4 Ohms. What is the value of continuity resistance for each winding i. e. U1-U2?
An indicator card from a cylinder of a slow speed diesel engine shows a high maximum pressure occurring earlier in the cycle than normal with a normal compression pressure. From the options given, which action is most likely to identify the cause of the problem?
Check if the fuel injection pump timing is correct.
Check if the fuel filters are blocked.
Check if the fuel viscosity and temperature are correct.
Check if the fuel injection valve is partly blocked.
A galley hot plate uses a Nichrome/Magnesium Oxide heating element and is to be tested before being put into service for the first time. An insulation resistance test yields a reading of 0,3 M Ohm. Which action should be taken?
Apply reduced voltage to the element for a few minutes. Then retest and if ok put into service.
Put the element into service.
Wash the element in a degreasing agent. Then retest and if ok put in into service.
A triac is used to provide temperature control of an oven. The galley complains that the oven only reaches approximately 50 % of demanded temperature. Which of the following is a likely cause?
The triac has completely failed.
The voltage supply to the oven controller is reduced by about 50 %.
Connection between the demand knob and the triac gate terminal has gone open circuit.
One of the main switching elements in the triac has failed.
In tanker operations, there will be some areas and zones where flammable or explosive vapour, gas, or dust may be expected. Such areas are classified as hazardous. What is meant by hazardous area Zone 1?
Flammable mixture is continuously present or present for long periods.
Flammable mixture is not continuously present, but will be present during normal operations.
Flammable mixture is not present at all times.
Flammable mixture would not normally be present or it would be present for a short period only.
During maintenance work on the main engine a problem arises regarding the lifting of a main component in that the manufacturer’s instructions ado not apply to the engine as fitted and present a hazard. In which of the information/record sources given in the options, is it most important to record the information relating to this anomaly?
ISM procedures in the ship’s safety manual.
Engine room planned maintenance schedule.
The majority of conventions adopted under the auspices of IMO fall into which of the three main categories?
Maritime Safety, Prevention of Marine pollution, Liability and compensation.
Maritime Safety, STCW, Maritime Security.
There are no conventions that fall under IMO.
Some ships generate electrical power at 440 Volts, but then step up this voltage to supply specific electrical equipment. One common example, may be to feed a large bow thruster. Why is this done?
A large bow thruster will draw very large currents at low voltage. Being typically remote from the generator, significant voltage drops would occur at low voltage.
The shipyard could not purchase High Voltage generating plant at the time of manufacture, so they used what was available at the time.
The overall ship’s electrical load does not justify High Voltage generating plant. This method allows more power to be delivered to the bow thruster at low running cost.
Manufacturers can supply High Voltage bow thrusters at less cost, and the power factor is improved.
Worn piston rings are allowing a small amount of piston blow-by on a 2-stroke main diesel engine cylinder, but due to the circumstances, it is not possible to stop and do a piston overhaul. What is the correct, temporary action to take?
Increase cylinder oil feed rate slightly and monitor the scavenge space drains.
Continue to operate the engine as normal.
Increase cylinder oil feed rate to the maximum.
This figure shows a transformer, with two windings, N(1) = 2 000 and N(2) = 1 000 turns, on a common magnetic circuit. Assume that there is no energy loss in the transformer itself. Calculate the current I(2) when the current I(1) = 2 A.
What should be the healthy continuity resistance of a 220 V, 2,2 kW, 10 A heating element, when checked near to it’s rated operating temperature?
How often should the lifeboat wire falls be turned and renewed?
Turned at intervals of not more than 30 months and renewed every 5 years.
Renewed every three years.
Turned every 30 months and needs only to be renewed if the wire is in poor condition.
Turned every 2 years and renewed every 4 years.
When measuring level of liquids with a conductivity level indicator, measurement is performed by:
A 6-Volt DC relay is to be used with a 12-Volt power supply. The relay requires a current of 0,1 Amp. What is the series resistance required?
In a distress situation, how many times or for how long should the emergency alarm signal be sounded?
Until all crew members and passengers have reported to their respective muster stations.
Until the signal “risk is over” or the order “abandon ship” is given.
A motor nameplate reads 75 hp. What is the reading in kW?
A 6-Volt DC relay is to be used with a 12-Volt power supply. The relay requires a current of 0,1 Amp. What is the series resistance required?
In the context of an automated control system, which controller must be tuned first in a cascade control system?
The secondary controller.
The engine turns over normally when starting air is supplied but does not fire even though normal starting rpm is achieved. What could be the probable cause to this?
Air in the fuel oil system.
The lubricating oil temperature is low.
The turbocharger has not run up to normal full speed.
The turning gear interlock has operated.
Continuity testing of a delta connected three phase induction motor yields the following results; U-V = 3 ohms, V-W = 3 ohms, W-U = 6 ohms. Which of the following is the likely condition?
Open circuit winding between W and U.
Partial fault between W and U.
Short circuit between V and Earth.
Short circuit between W and U.
Which is the preferred method for starting an air conditioning refrigeration compressor which has been shut down for a period of time?
Start with suction valve throttled in to minimise risk of drawing liquid refrigerant into the compressor.
Start with all system valves fully opened.
Start and stop repeatedly until suction pressure and oil pressure are normal.
Start with the discharge valve throttled in to prevent excess condenser pressure.
How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?
Adjustment of the pressure relief valve to recirculate part of the flow.
Positive displacement pumps operate at constant pressure and cannot be regulated.
By throttling the discharge valve.
By throttling the suction valve.
Which one of the listed requirements regarding abandon ship drills corresponds to present SOLAS regulation?
Each lifeboat shall be launched, and maneuvered in the water with its assigned crew at least once every three months during an abandon ship drill.
Drills shall be conducted when the ship is in a harbour.
All lifeboats shall be lowered during drills.
When carrying out repair or maintenance tasks involving hot work a hot work permit must be issued. Select the correct option from those given which completes the following statement. The permit for hot work:
Should only cover specific hot work tasks, be valid for a specified time period and be issued by the person carrying out the work.
Should only cover specific hot work tasks and be valid for a specified time period.
Is valid for completion of the specific hot work tasks irrespective of the time taken.
When should a crew member joining a ship for the first time be given some training and instructions in the use of the ship’s fire-fighting appliances?
As soon as possible but not later than 2 weeks after he joins the ship.
As soon as possible but not later than 2 days after he joins the ship.
As soon as possible but not later than 24 hours after he joins the ship.
How is a Safety Management Certificate obtained?
Ship owner has Document of Compliance issued, and vessel is assessed and holds all statutory certificates.
RSS issue SMC with Register.
Vessel is surveyed by MCA and certificate issued.
Ship owner is authorised to carry out internal audits and issue SMC.
The muster list shall show the duties assigned to the different members of the crew. Which of the given duties necessarily have to be included in the muster list?
Preparation and launching of survival crafts.
Type of fires that can be encountered on board.
Preparation and starting of emergency generator.
A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?
Contactor chattering (vibrating).
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 reduce the start air consumption during start up of the engine.
To check that all indicator cocks are closed before starting engine.
To fill the cylinders with sufficient fresh air to ensure a safe start of the engine.
The continuity resistance of a 100 m long × 25 sq. mm cable (rated at 100 A) is to be checked. Which of the following results would you anticipate?
Between 0,1 and 1,0 M Ohm.
Between 0,1 micro Ohm and 1,0 micro Ohm.
It is the Master’s responsibility to ensure that:
Concerned personnel carry out the on-board training programme effectively.
All information regarding the onboard training is given to the ship manager.
Safety equipment is not used during the training.
Life jackets are worn during every training.
The main engine is running steady with an average exhaust gas temperature of approximately 350 °C. What would be a typical alarm/slow down setting for the cylinder exhaust gas temperature deviation from the average?
A 3-phase cage rotor induction motor requires protection by a time delay overload trip. What is the reason for this?
It will allow for inrush current, or motor specific faults.
It will tolerate fault conditions during start up.
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
The cold room temperature is almost at the cut out point in a vapour-compression refrigeration system. What should the refrigerant state be just after the evaporator if the system is correctly set up?
Slightly superheated low pressure gas.
Wet vapour at high pressure.
Sub-cooled liquid at low pressure.
Cold liquid at high pressure.
A thermistor, which provides feedback for a thermal control system, is suspected to have failed. Assuming there is no available replacement, which of the following methods may be used to prove it has failed?
Disconnect the thermocouple lead from the controller, and replace it with a mA source.
Connect a mA source in parallel with the thermocouple connections.
Connect a mV source in parallel with the thermocouple connections.
Disconnect the thermocouple lead from the controller, and replace it with a mV source.
What is the purpose of the relief valves fitted to the doors and casing of 2-stroke diesel engine crankcases?
To relieve excess pressure in the crankcase resulting from a crankcase explosion.
To relieve excess pressure in the crankcase resulting from piston rod gland leakage.
To maintain a constant pressure in the crankcase.
When work must be done on High Voltage equipment, it is vital that the equipment is earthed (grounded) after isolation procedures have been carried out. Why is this?
To provide a reference point, and so ensure accuracy of any test results.
To ensure that it is dead, even if there was a flaw in the isolation procedure.
To ensure that no energy remains in the system, and that it cannot be recharged by external influences.
To ensure that the equipment does not overheat due to currents circulating through earth (ground).
The main engine is running steady with an average exhaust gas temperature of approximately 350 °C. What would be a typical alarm/slow down setting for the cylinder exhaust gas temperature deviation from the average?
The main propulsion diesel engine is normally started by direct admission of compressed air. Which one of the following statements is correct?
A heavily leaking starting air valve may cause an explosion in the starting air pipe system.
The starting air admission should continue until the engine has fired.
If the engine does not turn when the starting air is applied the turning gear can be used together with starting air to start the engine.
If the starting air pressure is too low a pressurized oxygen bottle from the welding equipment can be used for an emergency start of the engine.
In the context of an automated process control system, what is understood by the expression Master Controller?
The primary controller in a cascade control system.
The captain’s controller.
State of the art controller.
The best possible control system.