Test Online for Seamans about Engine, Management Level (CES v6.0)

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Правильні відповіді:
1

Which personnel must undergo familiarization training on board?

Ваша відповідь правильна:

Everyone.
2

Which of the following is typical for a feed-forward control system?

Ваша відповідь правильна:

Control of the process inlet side.
3

In the context of an automated process control system, what is understood by the expression Master Controller?

Ваша відповідь правильна:

The primary controller in a cascade control system.
4

What is the correct operation of the slow-turning facility fitted to some large 2-stroke main propulsion diesel engines?

Ваша відповідь правильна:

Slow turning should be set to operate automatically prior to engine start when engine has been stopped for 20 to 30 minutes during manoeuvring.
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?

Ваша відповідь правильна:

Apply reduced voltage to the element for a few minutes. Then retest, and if ok put into service.
6

Two reference points for pressure exist, absolute zero and atmospheric pressure. What are pressures measured relative to absolute zero called:

Ваша відповідь правильна:

Absolute pressure.
7

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?

Правильну відповідь:

Flammable mixture is continuously present or present for long periods.

Ваша відповідь:

Flammable mixture is not present at all times.
8

What does ISM stand for?

Ваша відповідь правильна:

The International Management Code for the Safe Operation of Ships and for Pollution Prevention.
9

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?

Ваша відповідь правильна:

No.
10

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?

Ваша відповідь правильна:

22 Ohms.
11

What is the result of an “unusually large metacentric height”?

Правильну відповідь:

The vessel will roll slowly or be unstable.

Ваша відповідь:

The vessel will have a great bending moment.
12

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?

Правильну відповідь:

To help to maintain the oil/water interface at the correct position.

Ваша відповідь:

To control the amount of fuel passing through the separator.
13

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?

Ваша відповідь правильна:

Electric motors will run at reduced speed, and will tend to overheat.
14

A motor nameplate reads 75 hp. What is the reading in kW?

Ваша відповідь правильна:

56 kW.
15

What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?

Ваша відповідь правильна:

Pressure forces caused by green water on deck.
16

Low voltage ships tend to have insulated neutral systems. What is the reason for this?

Ваша відповідь правильна:

In the event of an earth fault vital equipment will not trip.
17

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?

Ваша відповідь правильна:

One or more cylinder air start valves are stuck open.
18

The operating mode of a pyrotechnic signal depends essentially on:

Правильну відповідь:

Instructions or diagrams printed on its casing by the manufacturer.

Ваша відповідь:

The fact that the user is on board a liferaft, a lifeboat or ship.
19

When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?

Ваша відповідь правильна:

Zero-point is accurate, but 100 % input is not giving 100 % output.
20

The pyrotechnics used to transmit visual signals to other vessels, boats or aircrafts are of the following type:

Ваша відповідь правильна:

All of the below mentioned.
21

In a distress situation, how many times or for how long should the emergency alarm signal be sounded?

Ваша відповідь правильна:

Until all crew members and passengers have reported to their respective muster stations.
22

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.

Ваша відповідь правильна:

I(2) = 4 A.
23

When considering instrumentation systems, what is the meaning of the expression “dead-band”?

Правильну відповідь:

The controller will not react to a process change in this range.

Ваша відповідь:

It will take some time before the controller will react to a change.
24

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?

Ваша відповідь правильна:

Fuel viscosity.
25

Routine maintenance insulation testing of a three-phase induction motor should cover which measurements?

Ваша відповідь правильна:

U-E, V-E, W-E, U-V, V-W, W-U.
26

When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?

Ваша відповідь правильна:

Zero-point is accurate, but 100 % input is not giving 100 % output.
27

Some automated control systems use a master controller and a slave controller. What is the meaning of “remote mode” related to a slave controller?

Ваша відповідь правильна:

The slave controller receives the set-point from the output signal of the master controller.
28

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?

Правильну відповідь:

Clearing escape routes.

Ваша відповідь:

Preparation and launching of survival crafts.
29

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:

Ваша відповідь правильна:

Should only cover specific hot work tasks, be valid for a specified time period and be issued by the person carrying out the work.
30

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?

Ваша відповідь правильна:

Increase cylinder oil feed rate slightly and monitor the scavenge space drains.
31

The main propulsion diesel engine is normally started by direct admission of compressed air. Which one of the following statements is correct?

Ваша відповідь правильна:

A heavily leaking starting air valve may cause an explosion in the starting air pipe system.
32

In case of pollution in US waters, do you always have to notify the National Response Center (OPA-90)?

Правильну відповідь:

Yes, within thirty (30) minutes.

Ваша відповідь:

No, only the shipowner can notify NRC.
33

When turning a cascade control system, which of the following actions should be done first?

Ваша відповідь правильна:

Adjust the slave controller with the master controller in manual mode.
34

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?

Ваша відповідь правильна:

Figure 1.
35

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?

Ваша відповідь правильна:

To ensure that no energy remains in the system, and that it cannot be recharged by external influences.
36

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?

Ваша відповідь правильна:

Open circuit winding between W and U.
37

How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?

Ваша відповідь правильна:

Adjustment of the pressure relief valve to recirculate part of the flow.
38

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?

Ваша відповідь правильна:

Between 0,1 and 1,0 Ohm.
39

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?

Ваша відповідь правильна:

60 Ohm.
40

When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:

Ваша відповідь правильна:

Capillary tube.
41

What kind of electrolyte is used for Nickel-iron batteries?

Ваша відповідь правильна:

Solution of potassium hydroxide (KOH) and water.
42

A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?

Ваша відповідь правильна:

Contactor chattering (vibrating).
43

A transformer overheats while taking a shore supply. Which is the likely cause?

Ваша відповідь правильна:

Incorrect frequency.
44

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?

Ваша відповідь правильна:

Disconnect the thermocouple lead from the controller, and replace it with a mV source.
45

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?

Ваша відповідь правильна:

One of the main switching elements in the triac has failed.
46

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:

Ваша відповідь правильна:

Fouling of the hull.
47

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?

Ваша відповідь правильна:

60 ohm.
48

It is the Master’s responsibility to ensure that:

Ваша відповідь правильна:

Concerned personnel carry out the on-board training programme effectively.
49

The turbocharger on a diesel engine is surging. Which one of the following options would be the most likely cause?

Ваша відповідь правильна:

Dirty scavenging air cooler on the air side.
50

Why is it important that the correct tension is maintained in a diesel engine timing chain?

Ваша відповідь правильна:

Correct tension ensures that the chain and associated equipment is within normal loading limits.
51

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.

Правильну відповідь:

Set the proportional band to maximum width and the integral action to minimum (repeats per minute).

Ваша відповідь:

Set the proportional band to minimum width and the integral action to maximum (repeats per minute).
52

How often should the lifeboat wire falls be turned and renewed?

Ваша відповідь правильна:

Turned at intervals of not more than 30 months and renewed every 5 years.
53

What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?

Ваша відповідь правильна:

Pressure forces caused by green water on deck.
54

A transformer overheats while taking a shore supply. Which is the likely cause?

Ваша відповідь правильна:

Incorrect frequency.
55

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?

Ваша відповідь правильна:

Apply reduced voltage to the element for a few minutes. Then retest and if ok put into service.
56

Which is the preferred method for starting an air conditioning refrigeration compressor which has been shut down for a period of time?

Ваша відповідь правильна:

Start with suction valve throttled in to minimise risk of drawing liquid refrigerant into the compressor.
57

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?

Ваша відповідь правильна:

Check if the fuel injection pump timing is correct.
58

Why is an automatic slow turning feature included in the start air system of many large 2 stroke diesel engines?

Ваша відповідь правильна:

To avoid damage during start of the engine in case water or other liquid has gathered in the cylinders during an extended stop.
59

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?

Ваша відповідь правильна:

30 volts.
60

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?

Ваша відповідь правильна:

To avoid the introduction of non-indigenous species of marine life from one area to another.
61

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?

Ваша відповідь правильна:

The performance of the engine will be reduced noticeably.
62

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?

Ваша відповідь правильна:

Have the fuel pump phased and calibrated in a test workshop.
63

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?

Ваша відповідь правильна:

+/- 50 °C.
64

How is a Safety Management Certificate obtained?

Ваша відповідь правильна:

Ship owner has Document of Compliance issued, and vessel is assessed and holds all statutory certificates.
65

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?

Ваша відповідь правильна:

Faulty contactor coil.
66

The majority of conventions adopted under the auspices of IMO fall into which of the three main categories?

Ваша відповідь правильна:

Maritime Safety, Prevention of Marine pollution, Liability and compensation.
67

When measuring level of liquids with a conductivity level indicator, measurement is performed by:

Ваша відповідь правильна:

Electrodes.
68

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?

Ваша відповідь правильна:

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

In the context of an automated control system, which controller must be tuned first in a cascade control system?

Правильну відповідь:

The secondary controller.

Ваша відповідь:

The primary controller.
70

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?

Ваша відповідь правильна:

Slightly superheated low pressure gas.
71

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?

Ваша відповідь правильна:

+/- 50 °C.
72

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?

Ваша відповідь правильна:

Replace the damaged chocks with resin based chocks of an appropriate size.
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.

Ваша відповідь правильна:

Set the proportional band to maximum width and the integral action to minimum (repeats per minute).
74

In which of the following automated control processes will the time constant be of minor importance?

Ваша відповідь правильна:

Level control.
75

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?

Ваша відповідь правильна:

Slightly superheated low pressure gas.
76

A 3-phase cage rotor induction motor requires protection by a time delay overload trip. What is the reason for this?

Правильну відповідь:

It will allow for inrush current, or motor specific faults.

Ваша відповідь:

It will tolerate fault conditions during start up.
77

What is the best way to avoid pollution from small oil-spills aboard a ship?

Ваша відповідь правильна:

Contain any oil-spill onboard the ship.
78

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?

Ваша відповідь правильна:

Reduce the time between overhauls due to increasing fouling.
79

The coil of a 12 V, 120 mA DC relay must be connected across a 24 V supply. What action should be taken?

Ваша відповідь правильна:

Install a 100 Ohm resistor in series with the coil.
80

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?

Ваша відповідь правильна:

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.
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