Test Online for Seamans about Engine, Management Level (CES v6.0)
Результаты прохождения теста
Тест состоял из 80 случайных вопросов.
Всего вопросов по данной теме: 118
Всего вопросов по данной теме: 118
Ваш результат: 76%
Правильные ответы:
1
Low voltage ships tend to have insulated neutral systems. What is the reason for this?
Правильный ответ:
In the event of an earth fault vital equipment will not trip.Ваш ответ:
It’s easier to detect faults.2
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?
Ваш ответ правильный:
Check if the fuel injection pump timing is correct.3
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?
Ваш ответ правильный:
+/- 50 °C.4
A transformer overheats while taking a shore supply. Which is the likely cause?
Правильный ответ:
Incorrect frequency.Ваш ответ:
Incorrect current.5
How can a lead-acid type battery be checked to confirm if it is fully charged or not?
Ваш ответ правильный:
Measure the relative density (specific gravity) of the electrolyte.6
A portable oxygen analyser for use onboard ship is of the paramagnetic sensing element type. It is being used to test the atmosphere of a space onboard ship but starts to give erratic readings. There is no obvious indication as to why this is happening. Select from the options given the most likely cause of this problem:
Ваш ответ правильный:
The sampling filter is partially blocked giving rise to wide pressure variations in the sampling chamber.7
What does ISM stand for?
Ваш ответ правильный:
The International Management Code for the Safe Operation of Ships and for Pollution Prevention.8
How often should the lifeboat wire falls be turned and renewed?
Правильный ответ:
Turned at intervals of not more than 30 months and renewed every 5 years.Ваш ответ:
Turned every 30 months and needs only to be renewed if the wire is in poor condition.9
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?
Правильный ответ:
Disconnect the thermocouple lead from the controller, and replace it with a mV source.Ваш ответ:
Disconnect the thermocouple lead from the controller, and replace it with a mA source.10
What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?
Ваш ответ правильный:
Pressure forces caused by green water on deck.11
When performing electrical testing of a three phase motor, insulation resistance measurements may be influenced by which of the following?
Ваш ответ правильный:
Temperature, humidity and surface contamination.12
What is the result of an “unusually large metacentric height”?
Правильный ответ:
The vessel will roll slowly or be unstable.Ваш ответ:
The vessel will have a great bending moment.13
Which one of the listed requirements regarding abandon ship drills corresponds to present SOLAS regulation?
Ваш ответ правильный:
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.14
What is the purpose of the relief valves fitted to the doors and casing of 2-stroke diesel engine crankcases?
Правильный ответ:
To relieve excess pressure in the crankcase resulting from a crankcase explosion.Ваш ответ:
To maintain a constant pressure in the crankcase.15
The coil of a 12 V, 120 mA DC relay must be connected across a 24 V supply. What action should be taken?
Ваш ответ правильный:
Install a 100 Ohm resistor in series with the coil.16
In which of the following automated control processes will the time constant be of minor importance?
Ваш ответ правильный:
Level control.17
Who is responsible for ensuring that your ship’s security plan meets the requirements of the ISPS Code?
Ваш ответ правильный:
Company Security Officer.18
What is the advantage of a transmitter with a narrow measurement range?
Ваш ответ правильный:
Better linearity and increased accuracy.19
When selecting switchgear to work with High Voltage it is important to use an appropriate arcing medium. What is meant by arcing medium?
Ваш ответ правильный:
The gas, liquid or vapor, which will minimize creation of an electric arc as contacts open.20
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?
Правильный ответ:
60 Ohm.Ваш ответ:
120 Ohm.21
The pyrotechnics used to transmit visual signals to other vessels, boats or aircrafts are of the following type:
Ваш ответ правильный:
All of the below mentioned.22
A transformer rated at 22 kVA, 440/220 Volts, 60 Hz, is used to step down the voltage to a lighting system. The low tension voltage is to be kept constant at 220 Volts. What load impedance connected to the low-tension side will cause the transformer to be fully loaded?
Ваш ответ правильный:
2,2 Ohms.23
Some fuel oil and lubricating oil separators have a facility to control the back pressure of the clean oil outlet during start up and operation. What is the purpose of this control function?
Ваш ответ правильный:
To help to maintain the oil/water interface at the correct position.24
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?
Ваш ответ правильный:
Flammable mixture is continuously present or present for long periods.25
In the circuit diagram shown the starter connects between which terminals?
Правильный ответ:
5 and 6.Ваш ответ:
3 and 4.26
Routine maintenance insulation testing of a three-phase induction motor should cover which measurements?
Правильный ответ:
U-E, V-E, W-E, U-V, V-W, W-U.Ваш ответ:
U1-U2, V1-V2, W1-W2, U-E, V-E, W-E.27
Which of the following is typical for a feed-forward control system?
Ваш ответ правильный:
Control of the process inlet side.28
It is the Master’s responsibility to ensure that:
Ваш ответ правильный:
Concerned personnel carry out the on-board training programme effectively.29
In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?
Правильный ответ:
Qualified Individual.Ваш ответ:
The Master.30
In case of pollution in US waters, do you always have to notify the National Response Center (OPA-90)?
Ваш ответ правильный:
Yes, within thirty (30) minutes.31
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?
Ваш ответ правильный:
The pressure is greater than the pressure in the lubricating system and varies with the journal load.32
How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?
Ваш ответ правильный:
Adjustment of the pressure relief valve to recirculate part of the flow.33
Two reference points for pressure exist, absolute zero and atmospheric pressure. What are pressures measured relative to absolute zero called:
Ваш ответ правильный:
Absolute pressure.34
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
Ваш ответ правильный:
Capillary tube.35
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?
Ваш ответ правильный:
Slightly superheated low pressure gas.36
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?
Правильный ответ:
As soon as possible but not later than 2 weeks after he joins the ship.Ваш ответ:
As soon as possible but not later than 24 hours after he joins the ship.37
The main propulsion diesel engine is normally started by direct admission of compressed air. Which one of the following statements is correct?
Ваш ответ правильный:
A heavily leaking starting air valve may cause an explosion in the starting air pipe system.38
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:
Ваш ответ правильный:
Should only cover specific hot work tasks, be valid for a specified time period and be issued by the person carrying out the work.39
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?
Ваш ответ правильный:
22 Ohms.40
What is the maximum current that a 15 Volt, 3 Watt Zenerdiode can handle without damage?
Ваш ответ правильный:
0,2 A.41
The majority of conventions adopted under the auspices of IMO fall into which of the three main categories?
Ваш ответ правильный:
Maritime Safety, Prevention of Marine pollution, Liability and compensation.42
What is the correct operation of the slow-turning facility fitted to some large 2-stroke main propulsion diesel engines?
Ваш ответ правильный:
Slow turning should be set to operate automatically prior to engine start when engine has been stopped for 20 to 30 minutes during manoeuvring.43
In what kind of measuring equipment might we find a Bourdon-tube?
Ваш ответ правильный:
In a pressure transmitter.44
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?
Ваш ответ правильный:
120 °C.45
Power is available at a three-phase motor starter, but nothing happens (at starter or motor) when the start button is operated. Which of the following is a likely cause?
Ваш ответ правильный:
Faulty contactor coil.46
A 3-phase cage rotor induction motor requires protection by a time delay overload trip. What is the reason for this?
Правильный ответ:
It will allow for inrush current, or motor specific faults.Ваш ответ:
Fuses act too quickly.47
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?
Ваш ответ правильный:
To ensure that no energy remains in the system, and that it cannot be recharged by external influences.48
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?
Ваш ответ правильный:
Apply reduced voltage to the element for a few minutes. Then retest, and if ok put into service.49
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?
Ваш ответ правильный:
+/- 50 °C.50
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?
Ваш ответ правильный:
Figure 1.51
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?
Ваш ответ правильный:
60 ohm.52
When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?
Правильный ответ:
Zero-point is accurate, but 100 % input is not giving 100 % output.Ваш ответ:
100 % output is accurate, but Zero-point is wrong.53
A cable has a resistance of 100 milli-ohms. It supplies a 300 A load over a distance of 100 meters. What is the voltage drop along it’s length?
Ваш ответ правильный:
30 volts.54
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?
Правильный ответ:
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.Ваш ответ:
Manufacturers can supply High Voltage bow thrusters at less cost, and the power factor is improved.55
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:
Ваш ответ правильный:
Fouling of the hull.56
Why is it important that the correct tension is maintained in a diesel engine timing chain?
Ваш ответ правильный:
Correct tension ensures that the chain and associated equipment is within normal loading limits.57
When measuring level of liquids with a conductivity level indicator, measurement is performed by:
Ваш ответ правильный:
Electrodes.58
When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?
Ваш ответ правильный:
Zero-point is accurate, but 100 % input is not giving 100 % output.59
Which of the following symptoms would indicate that the filter drier in a refrigeration circuit has become blocked?
Правильный ответ:
A large temperature drop across the drier.Ваш ответ:
A pressure rise before the drier.60
What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?
Ваш ответ правильный:
Pressure forces caused by green water on deck.61
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?
Ваш ответ правильный:
6 Ohms.62
In a distress situation, how many times or for how long should the emergency alarm signal be sounded?
Ваш ответ правильный:
Until all crew members and passengers have reported to their respective muster stations.63
Oil analysis results for a sample of diesel engine lubricating oil show a high level of tin. What could be the possible cause?
Ваш ответ правильный:
Debris from damage to a white metal bearing.64
What is the best way to avoid pollution from small oil-spills aboard a ship?
Ваш ответ правильный:
Contain any oil-spill onboard the ship.65
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?
Ваш ответ правильный:
The performance of the engine will be reduced noticeably.66
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.
Правильный ответ:
I(2) = 4 A.Ваш ответ:
I(2) = 1 A.67
What kind of electrolyte is used for Nickel-iron batteries?
Ваш ответ правильный:
Solution of potassium hydroxide (KOH) and water.68
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?
Ваш ответ правильный:
Clearing escape routes.69
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?
Ваш ответ правильный:
Slightly superheated low pressure gas.70
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?
Правильный ответ:
Control valve gland is over tightened.Ваш ответ:
Control valve actuator diaphragm is ruptured.71
Some automated control systems use a master controller and a slave controller. What is the meaning of “remote mode” related to a slave controller?
Ваш ответ правильный:
The slave controller receives the set-point from the output signal of the master controller.72
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?
Ваш ответ правильный:
22 Ohms.73
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?
Ваш ответ правильный:
Faulty cylinder component (piston rings, liner, etc.).74
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?
Ваш ответ правильный:
The heavy fuel is unstable leading to excessive high viscosity sludge formation.75
In the context of an automated control system, which controller must be tuned first in a cascade control system?
Правильный ответ:
The secondary controller.Ваш ответ:
The primary controller.76
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.
Ваш ответ правильный:
Set the proportional band to maximum width and the integral action to minimum (repeats per minute).77
What is the best method for ensuring that the cylinder powers of a high speed diesel engine, fitted with a monoblock multi-cylinder fuel pump, are correctly balanced?
Правильный ответ:
Have the fuel pump phased and calibrated in a test workshop.Ваш ответ:
Measure the maximum pressure of each cylinder to check that they are equal.78
Why is an automatic slow turning feature included in the start air system of many large 2 stroke diesel engines?
Ваш ответ правильный:
To avoid damage during start of the engine in case water or other liquid has gathered in the cylinders during an extended stop.79
What principle of measurement are viscosity controllers usually based on?
Ваш ответ правильный:
Measurement of differential pressure.80