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

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Правильные ответы:
1

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.
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

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.
4

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

Ваш ответ правильный:

Electrodes.
5

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

Ваш ответ правильный:

Capillary tube.
6

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.
7

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.
8

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.
9

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.
10

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.
11

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.
12

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.
13

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.
14

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

Ваш ответ правильный:

Level control.
15

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.
16

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.
17

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.
18

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.
19

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.
20

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.
21

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.
22

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

Ваш ответ правильный:

Adjust the slave controller with the master controller in manual mode.
23

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.
24

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.
25

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.
26

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

Ваш ответ правильный:

Qualified Individual.
27

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.
28

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.
29

It is the Master’s responsibility to ensure that:

Ваш ответ правильный:

Concerned personnel carry out the on-board training programme effectively.
30

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.
31

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.
32

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

Ваш ответ правильный:

Incorrect frequency.
33

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.
34

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.
35

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).
36

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).
37

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.
38

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.
39

What does ISM stand for?

Ваш ответ правильный:

The International Management Code for the Safe Operation of Ships and for Pollution Prevention.
40

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

Ваш ответ правильный:

To avoid pollution.
41

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.
42

Which personnel must undergo familiarization training on board?

Ваш ответ правильный:

Everyone.
43

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.
44

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.
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

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.
47

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.
48

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.
49

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.
50

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?

Правильный ответ:

2,2 Ohms.

Ваш ответ:

22 Ohms.
51

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?

Ваш ответ правильный:

60 Ohm.
52

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.
53

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

Ваш ответ правильный:

Solution of potassium hydroxide (KOH) and water.
54

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.
55

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.
56

What principle of measurement are viscosity controllers usually based on?

Ваш ответ правильный:

Measurement of differential pressure.
57

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.
58

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.
59

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.
60

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.
61

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.
62

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.
63

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.
64

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.
65

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?

Ваш ответ правильный:

Clearing escape routes.
66

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.
67

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

Ваш ответ правильный:

Incorrect frequency.
68

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.
69

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.
70

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.
71

What is the advantage of a transmitter with a narrow measurement range?

Ваш ответ правильный:

Better linearity and increased accuracy.
72

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.
73

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.
74

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.
75

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.
76

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?

Ваш ответ правильный:

Faulty cylinder component (piston rings, liner, etc.).
77

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.
78

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?

Ваш ответ правильный:

60 ohm.
79

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.
80

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

Ваш ответ правильный:

0,2 A.
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