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.
2
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.
3
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.
4
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.
5
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.
6
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
Ваш ответ правильный:
Capillary tube.
7
Who is responsible for ensuring that your ship’s security plan meets the requirements of the ISPS Code?
Ваш ответ правильный:
Company Security Officer.
8
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.
9
It is the Master’s responsibility to ensure that:
Правильный ответ:
Concerned personnel carry out the on-board training programme effectively.
Ваш ответ:
All information regarding the onboard training is given to the ship manager.
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?
Правильный ответ:
Scavenge ports dirty.
Ваш ответ:
Exhaust gas boiler fouled.
11
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.
12
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.
13
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.
14
A motor nameplate reads 75 hp. What is the reading in kW?
Ваш ответ правильный:
56 kW.
15
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.
16
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.
17
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.
18
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.
19
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.
20
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?
Правильный ответ:
Figure 1.
Ваш ответ:
Figure 3.
21
Which personnel must undergo familiarization training on board?
Ваш ответ правильный:
Everyone.
22
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.
23
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?
Ваш ответ правильный:
To avoid the introduction of non-indigenous species of marine life from one area to another.
24
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.
25
In which of the following automated control processes will the time constant be of minor importance?
Ваш ответ правильный:
Level control.
26
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.
27
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.
28
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.
29
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:
It will tolerate fault conditions during start up.
30
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.
31
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.
32
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.
33
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.
34
Which of the following is typical for a feed-forward control system?
Правильный ответ:
Control of the process inlet side.
Ваш ответ:
I don’t know.
35
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.
36
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).
37
What kind of electrolyte is used for Nickel-iron batteries?
Правильный ответ:
Solution of potassium hydroxide (KOH) and water.
Ваш ответ:
Solution of sulphuric acid and water.
38
What principle of measurement are viscosity controllers usually based on?
Ваш ответ правильный:
Measurement of differential pressure.
39
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.
40
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.
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
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.
43
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.
44
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.
45
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?
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.
47
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.
48
In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?
Ваш ответ правильный:
Qualified Individual.
49
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.
50
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.
51
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.
52
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.
53
In what kind of measuring equipment might we find a Bourdon-tube?
Ваш ответ правильный:
In a pressure transmitter.
54
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.
55
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.
56
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.
57
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.
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
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.
60
In the circuit diagram shown the starter connects between which terminals?
Ваш ответ правильный:
5 and 6.
61
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.
62
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?
Ваш ответ правильный:
Between 0,1 and 1,0 Ohm.
63
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.
64
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.
65
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.
66
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.
67
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:
Connect a mV source in parallel with the thermocouple connections.
68
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.
69
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.
70
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.
71
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.
72
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.
73
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).
74
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.
Ваш ответ правильный:
Reduced current and reduced torque.
75
A transformer overheats while taking a shore supply. Which is the likely cause?
Ваш ответ правильный:
Incorrect frequency.
76
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.
77
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.
78
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.
79
When measuring level of liquids with a conductivity level indicator, measurement is performed by:
Ваш ответ правильный:
Electrodes.
80
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?