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: 95%
Правильные ответы:
1
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?
Ваш ответ правильный:
Stop bunkering, and establish facts, before bunkering is resumed.2
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.3
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.4
What kind of electrolyte is used for Nickel-iron batteries?
Ваш ответ правильный:
Solution of potassium hydroxide (KOH) and water.5
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.6
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.7
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.8
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?
Правильный ответ:
One of the main switching elements in the triac has failed.Ваш ответ:
Connection between the demand knob and the triac gate terminal has gone open circuit.9
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.10
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?
Ваш ответ правильный:
Scavenge ports dirty.11
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.12
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.13
A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?
Ваш ответ правильный:
Contactor chattering (vibrating).14
What is the purpose of the relief valves fitted to the doors and casing of 2-stroke diesel engine crankcases?
Ваш ответ правильный:
To relieve excess pressure in the crankcase resulting from a crankcase explosion.15
In the context of an automated process control system, what is understood by the expression Master Controller?
Ваш ответ правильный:
The primary controller in a cascade control system.16
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?
Ваш ответ правильный:
Rotten eggs.17
What is the maximum current that a 15 Volt, 3 Watt Zenerdiode can handle without damage?
Ваш ответ правильный:
0,2 A.18
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.19
In terms of automated control systems, what is typical for a continuous control system?
Ваш ответ правильный:
It is possible to predict the control mathematically.20
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.21
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.22
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.23
When considering instrumentation systems, what is the meaning of the expression “dead-band”?
Ваш ответ правильный:
The controller will not react to a process change in this range.24
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 1.25
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?
Ваш ответ правильный:
No.26
Who is responsible for ensuring that your ship’s security plan meets the requirements of the ISPS Code?
Ваш ответ правильный:
Company Security Officer.27
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?
Ваш ответ правильный:
Electric motors will run at reduced speed, and will tend to overheat.28
In the context of an automated control system, which controller must be tuned first in a cascade control system?
Ваш ответ правильный:
The secondary controller.29
Which of the following is typical for a feed-forward control system?
Ваш ответ правильный:
Control of the process inlet side.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
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?
Ваш ответ правильный:
Increase cylinder oil feed rate slightly and monitor the scavenge space drains.32
The turbocharger on a diesel engine is surging. Which one of the following options would be the most likely cause?
Ваш ответ правильный:
Dirty scavenging air cooler on the air side.33
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.34
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.35
What principle of measurement are viscosity controllers usually based on?
Ваш ответ правильный:
Measurement of differential pressure.36
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.37
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.38
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.39
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.40
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?
Правильный ответ:
Fuel viscosity.Ваш ответ:
Fuel temperature.41
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.42
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?
Ваш ответ правильный:
Have the fuel pump phased and calibrated in a test workshop.43
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.44
Low voltage ships tend to have insulated neutral systems. What is the reason for this?
Ваш ответ правильный:
In the event of an earth fault vital equipment will not trip.45
When measuring level of liquids with a conductivity level indicator, measurement is performed by:
Ваш ответ правильный:
Electrodes.46
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.47
Which of the following options would be a typical differential pressure setting for a main engine slow down in the event of jacket cooling water system low flow?
Ваш ответ правильный:
0,2 to 0,5 bar.48
The torsion meter for the main propeller shaft is reading high. The torque is sensed using the angle of twist principle with two clamp rings attached to the shaft at a fixed distance, with stationary proximity switches for measuring the angle of twist and also shaft speed fixed to a rigid stool. What is the most likely cause of the high reading?
Ваш ответ правильный:
Circumferential slip of the after clamp ring in the opposite direction to shaft rotation.49
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.50
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.51
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?
Ваш ответ правильный:
Air in the fuel oil system.52
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?
Ваш ответ правильный:
Disconnect the thermocouple lead from the controller, and replace it with a mV source.53
What does ISM stand for?
Ваш ответ правильный:
The International Management Code for the Safe Operation of Ships and for Pollution Prevention.54
In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?
Ваш ответ правильный:
Qualified Individual.55
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
Ваш ответ правильный:
Capillary tube.56
When starting air is applied to a diesel engine the engine fails to turn over but is seen to oscillate back and forth. What is the most likely cause of this problem?
Ваш ответ правильный:
One or more cylinder air start valves are stuck open.57
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.58
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.59
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.60
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.61
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?
Ваш ответ правильный:
As soon as possible but not later than 2 weeks after he joins the ship.62
In which of the following automated control processes will the time constant be of minor importance?
Ваш ответ правильный:
Level control.63
A medium speed diesel engine is used to drive a controllable pitch propeller through a suitable clutch and reduction gearbox. What should the propeller blade attitude normally be after the engine is started and before the clutch can be engaged?
Ваш ответ правильный:
The blades should be in the zero pitch position.64
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.65
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.
Ваш ответ правильный:
I(2) = 4 A.66
What should be the healthy continuity resistance of a 220V, 2,2kW, 10A heating element, when checked near to it’s rated operating temperature?
Ваш ответ правильный:
22 Ohms.67
Which is the preferred method for starting an air conditioning refrigeration compressor which has been shut down for a period of time?
Ваш ответ правильный:
Start with suction valve throttled in to minimise risk of drawing liquid refrigerant into the compressor.68
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?
Ваш ответ правильный:
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.69
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.70
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?
Ваш ответ правильный:
Replace the damaged chocks with resin based chocks of an appropriate size.71
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?
Ваш ответ правильный:
Open circuit winding between W and U.72
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.73
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).74
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.75
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?
Правильный ответ:
2,2 Ohms.Ваш ответ:
22 Ohms.76
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.77
The operating mode of a pyrotechnic signal depends essentially on:
Ваш ответ правильный:
Instructions or diagrams printed on its casing by the manufacturer.78
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).79
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.80