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
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?
Ваш ответ правильный:
One of the main switching elements in the triac has failed.2
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.3
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.4
What principle of measurement are viscosity controllers usually based on?
Ваш ответ правильный:
Measurement of differential pressure.5
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.6
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?
Ваш ответ правильный:
Fuel viscosity.7
Routine maintenance insulation testing of a three-phase induction motor should cover which measurements?
Ваш ответ правильный:
U-E, V-E, W-E, U-V, V-W, W-U.8
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?
Правильный ответ:
Open circuit winding between W and U.Ваш ответ:
Short circuit winding between W and U.9
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.10
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.11
How is a Safety Management Certificate obtained?
Ваш ответ правильный:
Ship owner has Document of Compliance issued, and vessel is assessed and holds all statutory certificates.12
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.13
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.14
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.15
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).16
A motor nameplate reads 75 hp. What is the reading in kW?
Ваш ответ правильный:
56 kW.17
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.18
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.19
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.20
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.21
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.22
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.23
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.24
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.25
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.26
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.27
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.28
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.29
Why shall a duly qualified officer supervise any potential polluting operation?
Ваш ответ правильный:
To avoid pollution.30
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.31
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.32
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.33
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.34
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.35
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.36
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.37
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:
Правильный ответ:
Should only cover specific hot work tasks, be valid for a specified time period and be issued by the person carrying out the work.Ваш ответ:
Should only cover specific hot work tasks and be valid for a specified time period.38
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.39
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.40
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.
Правильный ответ:
Set the proportional band to maximum width and the integral action to minimum (repeats per minute).Ваш ответ:
Set the proportional band to minimum width and the integral action to maximum (repeats per minute).41
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.42
In what kind of measuring equipment might we find a Bourdon-tube?
Ваш ответ правильный:
In a pressure transmitter.43
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.44
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.45
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.46
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.47
What kind of electrolyte is used for Nickel-iron batteries?
Ваш ответ правильный:
Solution of potassium hydroxide (KOH) and water.48
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.49
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.50
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.51
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.52
Which personnel must undergo familiarization training on board?
Ваш ответ правильный:
Everyone.53
How often should the lifeboat wire falls be turned and renewed?
Ваш ответ правильный:
Turned at intervals of not more than 30 months and renewed every 5 years.54
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.55
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.56
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.57
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.58
What is the result of an “unusually large metacentric height”?
Ваш ответ правильный:
The vessel will roll slowly or be unstable.59
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.60
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.61
A 3-phase cage rotor induction motor requires protection by a time delay overload trip. What is the reason for this?
Ваш ответ правильный:
It will allow for inrush current, or motor specific faults.62
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.63
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.64
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
Ваш ответ правильный:
Capillary tube.65
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.66
It is the Master’s responsibility to ensure that:
Ваш ответ правильный:
Concerned personnel carry out the on-board training programme effectively.67
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.68
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 1.69
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.70
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.71
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.72
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.73
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.74
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?
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.75
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.76
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.77
In the circuit diagram shown the starter connects between which terminals?
Ваш ответ правильный:
5 and 6.78
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.79
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.80