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

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Правильные ответы:
1

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.
2

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.
3

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.
4

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.
5

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.
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

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.
8

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.
9

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.
10

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.
11

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.
12

What principle of measurement are viscosity controllers usually based on?

Ваш ответ правильный:

Measurement of differential pressure.
13

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.).
14

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.
15

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.
16

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.
17

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.
18

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.
19

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?

Ваш ответ правильный:

Flammable mixture is continuously present or present for long periods.
20

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.
21

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?

Ваш ответ правильный:

As soon as possible but not later than 2 weeks after he joins the ship.
22

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.
23

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.
24

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.
25

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.
26

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

Ваш ответ правильный:

Solution of potassium hydroxide (KOH) and water.
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?

Ваш ответ правильный:

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

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.
29

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).
30

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.
31

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.
32

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.
33

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

Ваш ответ правильный:

Incorrect frequency.
34

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?

Ваш ответ правильный:

Fuel viscosity.
35

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.
36

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.
37

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?

Ваш ответ правильный:

30 volts.
38

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.
39

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.
40

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.
41

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.
42

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

Ваш ответ правильный:

Better linearity and increased accuracy.
43

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.
44

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.
45

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.
46

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.
47

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.
48

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.
49

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

Ваш ответ правильный:

0,2 A.
50

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.
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

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?

Ваш ответ правильный:

The blades should be in the zero pitch position.
53

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.
54

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).
55

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

Ваш ответ правильный:

U-E, V-E, W-E, U-V, V-W, W-U.
56

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.
57

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.
58

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:

It will take some time before the controller will react to a change.
59

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.
60

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

Ваш ответ правильный:

Level control.
61

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.
62

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

Ваш ответ правильный:

To avoid pollution.
63

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.
64

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.
65

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.
66

What does ISM stand for?

Ваш ответ правильный:

The International Management Code for the Safe Operation of Ships and for Pollution Prevention.
67

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.
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

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

Ваш ответ правильный:

In a pressure transmitter.
70

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.
71

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.
72

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.
73

Which personnel must undergo familiarization training on board?

Ваш ответ правильный:

Everyone.
74

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

Ваш ответ правильный:

Control of the process inlet side.
75

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

Ваш ответ правильный:

Incorrect frequency.
76

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.
77

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.
78

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.
79

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?

Ваш ответ правильный:

Figure 1.
80

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.
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