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: 70%
Правильные ответы:
1
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.2
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?
Правильный ответ:
6 Ohms.Ваш ответ:
12 Ohms.3
When performing electrical testing of a three phase motor, insulation resistance measurements may be influenced by which of the following?
Правильный ответ:
Temperature, humidity and surface contamination.Ваш ответ:
I don’t know.4
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?
Правильный ответ:
Electric motors will run at reduced speed, and will tend to overheat.Ваш ответ:
Generators are more sensitive to reverse power faults.5
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.6
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.7
Which personnel must undergo familiarization training on board?
Ваш ответ правильный:
Everyone.8
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?
Правильный ответ:
Flammable mixture is continuously present or present for long periods.Ваш ответ:
Flammable mixture is not continuously present, but will be present during normal operations.9
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
Ваш ответ правильный:
Capillary tube.10
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).11
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.12
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:
I don’t know.13
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.14
In the circuit diagram shown the starter connects between which terminals?
Ваш ответ правильный:
5 and 6.15
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.16
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.17
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?
Правильный ответ:
Replace the damaged chocks with resin based chocks of an appropriate size.Ваш ответ:
Replace the complete steel chocking system with a resin based system.18
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.19
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.20
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.21
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.22
In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?
Правильный ответ:
Qualified Individual.Ваш ответ:
Emergency response team.23
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.24
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?
Ваш ответ правильный:
Control valve gland is over tightened.25
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:
80 ohm.26
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.27
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.28
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.29
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.30
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.31
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.32
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.33
What principle of measurement are viscosity controllers usually based on?
Правильный ответ:
Measurement of differential pressure.Ваш ответ:
Measurement of flow.34
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.35
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.36
In what kind of measuring equipment might we find a Bourdon-tube?
Ваш ответ правильный:
In a pressure transmitter.37
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.38
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.39
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.40
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.41
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.42
What does ISM stand for?
Ваш ответ правильный:
The International Management Code for the Safe Operation of Ships and for Pollution Prevention.43
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.44
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?
Правильный ответ:
Between 0,1 and 1,0 Ohm.Ваш ответ:
I don’t know.45
How will continuous low load operation influence the time between overhauls, tbo, for the cylinder covers and associated valves of a 4-stroke diesel engine?
Ваш ответ правильный:
Reduce the time between overhauls due to increasing fouling.46
In a distress situation, how many times or for how long should the emergency alarm signal be sounded?
Правильный ответ:
Until all crew members and passengers have reported to their respective muster stations.Ваш ответ:
3 minutes.47
When considering instrumentation systems, what is the meaning of the expression “dead-band”?
Правильный ответ:
The controller will not react to a process change in this range.Ваш ответ:
The controller will enter “sleep mode”.48
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.49
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.50
When turning a cascade control system, which of the following actions should be done first?
Правильный ответ:
Adjust the slave controller with the master controller in manual mode.Ваш ответ:
I don’t know.51
The operating mode of a pyrotechnic signal depends essentially on:
Ваш ответ правильный:
Instructions or diagrams printed on its casing by the manufacturer.52
How is a Safety Management Certificate obtained?
Правильный ответ:
Ship owner has Document of Compliance issued, and vessel is assessed and holds all statutory certificates.Ваш ответ:
Vessel is surveyed by MCA and certificate issued.53
A motor nameplate reads 75 hp. What is the reading in kW?
Ваш ответ правильный:
56 kW.54
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.55
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.56
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?
Правильный ответ:
30 volts.Ваш ответ:
I don’t know.57
In which of the following automated control processes will the time constant be of minor importance?
Правильный ответ:
Level control.Ваш ответ:
Pressure control.58
Which of the following symptoms would indicate that the filter drier in a refrigeration circuit has become blocked?
Ваш ответ правильный:
A large temperature drop across the drier.59
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.60
Some automated control systems use a master controller and a slave controller. What is the meaning of “remote mode” related to a slave controller?
Правильный ответ:
The slave controller receives the set-point from the output signal of the master controller.Ваш ответ:
The slave controller can be turned by a hand carried remote controller.61
Two reference points for pressure exist, absolute zero and atmospheric pressure. What are pressures measured relative to absolute zero called:
Правильный ответ:
Absolute pressure.Ваш ответ:
Pressure drop.62
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.63
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.64
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 density.65
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 roll violently.66
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.67
In terms of automated control systems, what is typical for a continuous control system?
Правильный ответ:
It is possible to predict the control mathematically.Ваш ответ:
The control valve will always be changing position.68
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.69
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?
Правильный ответ:
Rotten eggs.Ваш ответ:
I don’t know.70
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.71
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.72
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.73
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?
Правильный ответ:
Scavenge ports dirty.Ваш ответ:
Exhaust gas boiler fouled.74
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.75
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.76
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.77
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.78
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.79
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?
Ваш ответ правильный:
ISM procedures in the ship’s safety manual.80