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

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Правильні відповіді:
1

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

Ваша відповідь правильна:

Yes, within thirty (30) minutes.
2

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

Ваша відповідь правильна:

The secondary controller.
3

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.
4

When selecting switchgear to work with High Voltage it is important to use an appropriate arcing medium. What is meant by arcing medium?

Ваша відповідь правильна:

The gas, liquid or vapor, which will minimize creation of an electric arc as contacts open.
5

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).
6

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.
7

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.
8

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.
9

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?

Ваша відповідь правильна:

0,2 to 0,5 bar.
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.

Ваша відповідь правильна:

Set the proportional band to maximum width and the integral action to minimum (repeats per minute).
11

Which one of the listed requirements regarding abandon ship drills corresponds to present SOLAS regulation?

Ваша відповідь правильна:

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.
12

In the circuit diagram shown the starter connects between which terminals?

Ваша відповідь правильна:

5 and 6.
13

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.
14

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.
15

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.
16

When performing electrical testing of a three phase motor, insulation resistance measurements may be influenced by which of the following?

Ваша відповідь правильна:

Temperature, humidity and surface contamination.
17

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.
18

In what kind of measuring equipment might we find a Bourdon-tube?

Ваша відповідь правильна:

In a pressure transmitter.
19

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?

Ваша відповідь правильна:

Control valve gland is over tightened.
20

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.
21

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.
22

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.
23

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.
24

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.
25

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.
26

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?

Ваша відповідь правильна:

6 Ohms.
27

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?

Ваша відповідь правильна:

The blades should be in the zero pitch position.
28

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.
29

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.
30

Which personnel must undergo familiarization training on board?

Ваша відповідь правильна:

Everyone.
31

What is the maximum current that a 15 Volt, 3 Watt Zenerdiode can handle without damage?

Ваша відповідь правильна:

0,2 A.
32

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.
33

Which of the following symptoms would indicate that the filter drier in a refrigeration circuit has become blocked?

Ваша відповідь правильна:

A large temperature drop across the drier.
34

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.
35

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?

Ваша відповідь правильна:

ISM procedures in the ship’s safety manual.
36

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

Ваша відповідь правильна:

Solution of potassium hydroxide (KOH) and water.
37

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:

Правильну відповідь:

The sampling filter is partially blocked giving rise to wide pressure variations in the sampling chamber.

Ваша відповідь:

The sampling filter is blocked preventing gas from entering the sampling camber.
38

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.

Правильну відповідь:

I(2) = 4 A.

Ваша відповідь:

I(2) = 2 A.
39

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?

Ваша відповідь правильна:

Flammable mixture is continuously present or present for long periods.
40

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).
41

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.
42

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?

Ваша відповідь правильна:

The heavy fuel is unstable leading to excessive high viscosity sludge formation.
43

In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?

Ваша відповідь правильна:

Qualified Individual.
44

The operating mode of a pyrotechnic signal depends essentially on:

Ваша відповідь правильна:

Instructions or diagrams printed on its casing by the manufacturer.
45

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.
46

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

Ваша відповідь правильна:

Electrodes.
47

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.
48

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.
49

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.
50

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.
51

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.
52

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.
53

What is the purpose of the relief valves fitted to the doors and casing of 2-stroke diesel engine crankcases?

Ваша відповідь правильна:

To relieve excess pressure in the crankcase resulting from a crankcase explosion.
54

Oil analysis results for a sample of diesel engine lubricating oil show a high level of tin. What could be the possible cause?

Ваша відповідь правильна:

Debris from damage to a white metal bearing.
55

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?

Ваша відповідь правильна:

120 °C.
56

Why shall a duly qualified officer supervise any potential polluting operation?

Ваша відповідь правильна:

To avoid pollution.
57

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?

Ваша відповідь правильна:

As soon as possible but not later than 2 weeks after he joins the ship.
58

How can a lead-acid type battery be checked to confirm if it is fully charged or not?

Ваша відповідь правильна:

Measure the relative density (specific gravity) of the electrolyte.
59

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.
60

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.
61

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.
62

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.
63

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?

Ваша відповідь правильна:

Scavenge ports dirty.
64

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.
65

In terms of automated control systems, what is typical for a continuous control system?

Ваша відповідь правильна:

It is possible to predict the control mathematically.
66

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?

Ваша відповідь правильна:

Air in the fuel oil system.
67

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?

Ваша відповідь правильна:

2,2 Ohms.
68

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:

The controller will not respond to adjustment of set-point.
69

It is the Master’s responsibility to ensure that:

Ваша відповідь правильна:

Concerned personnel carry out the on-board training programme effectively.
70

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

Ваша відповідь правильна:

Incorrect frequency.
71

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.
72

What principle of measurement are viscosity controllers usually based on?

Ваша відповідь правильна:

Measurement of differential pressure.
73

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.
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.

Ваша відповідь правильна:

Reduced current and reduced torque.
75

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.
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

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.
78

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?

Ваша відповідь правильна:

Stop bunkering, and establish facts, before bunkering is resumed.
79

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?

Ваша відповідь правильна:

To help to maintain the oil/water interface at the correct position.
80

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.
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