Test online for seamans about Engine department, Management level, Slow Speed (CES v6.0)

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Правильные ответы:
1

What is the main reason for routine testing of the cooling water in a diesel engine cooling system?

Ваш ответ правильный:

To ensure that the correct levels of chemical treatment are maintained at all times.
2

What is the correct method to be used to obtain a reduced output from a centrifugal pump?

Ваш ответ правильный:

By throttling of the pump discharge valve.
3

What information is required to evaluate the condition of a heat exchanger during operation?

Ваш ответ правильный:

Inlet and outlet temperatures and pressure drops across the heat exchanger for both fluids.
4

Why is it necessary to carry out routine tests of the water in a diesel engine cooling water system?

Ваш ответ правильный:

To check that the correct concentration of corrosion inhibitors are maintained.
5

How often should water testing of a diesel engine cooling water system be carried out to check treatment levels and water condition during normal engine operation?

Ваш ответ правильный:

Once a week.
6

With two alternators running in parallel, and one is to be disconnected. The first step is to:

Ваш ответ правильный:

Remove the load from the alternator to be stopped.
7

A 450 volt 3 phase brushless alternator will have the following combination of items mounted on the rotor:

Ваш ответ правильный:

3 phase excitation winding/rectifier bank/main field winding.
8

In accordance with SOLAS and other international regulations, certain important machinery functions, such as operation and control of the steering gear and propulsion machinery, must be tested at specified times. When should these tests be carried out?

Ваш ответ правильный:

Prior to arrival and departure from port and following maintenance.
9

A ship has a medium speed engine and a controllable pitch propeller propulsion system. What would the propeller pitch normally have to be at to allow starting of the engine?

Ваш ответ правильный:

Zero.
10

According to basic principles regarding fire protection the ship is to be divided in zones by structural and thermal boundaries. (SOLAS II-2/2.2.1).

Ваш ответ правильный:

In main vertical zones.
11

How is the activation of any detector or manually operated call point of fixed fire-detection and fire-alarm systems to be indicated? (SOLAS II-2/13.1.4).

Ваш ответ правильный:

By visual and audible signal at the control panel and indicating units.
12

After water-washing the turbocharger exhaust side it starts to vibrate even though it was operating normally prior to the washing procedure. What is the most likely cause of this problem?

Ваш ответ правильный:

The rotor blades are damaged or the blades are not properly cleaned.
13

In the event of a severe scavenge fire, which of the following is most likely to be seriously damaged?

Ваш ответ правильный:

Piston rod and stuffing box.
14

What shall you do if you see a person falling into the sea?

Ваш ответ правильный:

Throw a lifebuoy over board and report to the bridge immediately.
15

After main power is restored (following a blackout), a timed sequential restart of motor-driven auxiliaries is necessary to avoid:

Ваш ответ правильный:

Generator overload due to many motors starting at simultaneously.
16

A motor is protected by a thermal overcurrent relay. After tripping on overload it will not be possible to reset the overcurrent relay immediately because the:

Ваш ответ правильный:

Bimetallic strips need time to cool down.
17

A delta connected 3-phase AC induction motor is running normally at its rated current of 150 A when a single phasing fault (open circuit) occurs in one line. The likely outcome will be:

Ваш ответ правильный:

Line currents: 0 A, 180 A, 180 A. Trip condition: trip on overload.
18

Generators work on the principle of electromagnetic induction. The internal EMF generated in the phase windings of an AC generator is controlled by:

Ваш ответ правильный:

The diesel speed and excitation current.
19

Which of the following would be considered pollution, when discharged overboard, under the US water pollution laws?

Ваш ответ правильный:

All of the mentioned.
20

Why are crankcase heaters fitted to some refrigeration system compressors?

Ваш ответ правильный:

To prevent refrigerant condensing in the crankcase when the compressor is stopped.
21

What is the main effect on lubricating oil of operating for long periods at excessively high temperature?

Ваш ответ правильный:

It will cause the oil to oxidise, increasing the viscosity.
22

During reassembly of a plate type heat exchanger following cleaning, the plate stack is normally compressed to a recommended thickness when tightening the tie bolts. Why is this recommended thickness given?

Ваш ответ правильный:

To prevent serious damages to the plates.
23

What is the best method to use to remove heavy scale and fouling from the plates of a heat exchanger?

Ваш ответ правильный:

Soak the plates in a recommended cleaning solution and then use a soft brush or pressure cleaner.
24

Is it necessary to cool the samples taken from a diesel engine cooling water system before carrying out tests to determine the concentration of treatment chemicals?

Ваш ответ правильный:

Yes, the samples should be cooled to approximately 25 °C.
25

Why may wearing sweat rags slung round your neck when working in the machinery spaces be hazardous?

Ваш ответ правильный:

The rags may be caught by running machinery or power tools.
26

Which electronic component does this graphical symbol represent?

Ваш ответ правильный:

Capacitor.
27

Which component does this graphical symbol illustrate?

Ваш ответ правильный:

Pressure indicator, installed on panel/console.
28

Which of the following detectors would you choose for measuring the torque of a steel shaft?

Ваш ответ правильный:

Strain gauge.
29

What is a ZENER BARRIER?

Ваш ответ правильный:

A zener barrier is a unit made to obtain intrinsic safety in installations for instrumentation in hazardous areas.
30

In terms of instrumentation and measurement, what is a digital signal?

Ваш ответ правильный:

A signal with discrete levels such as 0 = “low” and 1 = “High”.
31

What is the main purpose for taking diesel engine crankshaft deflections?

Ваш ответ правильный:

To check for weardown of the main bearings.
32

Abdominal Thrust is the name on a technique which involves applying a series of thrusts to the upper abdomen in an attempt to force air out of a choking casualty’s lungs. How to perform this technique?

Ваш ответ правильный:

Stand behind the casualty. Clench your fist with the thumb inwards in the center of upper abdomen. Grasp your fist with your other hand and pull quickly inwards.
33

What is the minimum number of portable two way VHF walkie talkies for use in survival craft, that should be carried onboard vessels which comply with GMDSS regulations?

Ваш ответ правильный:

3 sets.
34

What is recognized as the main hazard when entering a void space?

Ваш ответ правильный:

Lack of oxygen.
35

What is the correct method to use for fitting a rolling contact bearing, such as a ball bearing, onto a parallel shaft?

Ваш ответ правильный:

Gently heat the bearing in an oil bath and use a bearing puller to draw it onto the shaft.
36

Every person onboard ship has a responsibility for safety and security. General house-keeping rules should be followed. Which of the listed rules is the most important onboard a tanker?

Ваш ответ правильный:

Never carry lighters or matches on the tank deck.
37

What precautions should be taken for the deck covering in a steering gear room where hydraulic oil is in use?

Ваш ответ правильный:

Coat the deck with non slip paint and use duck boards provided with drainage.
38

What action should be taken by the watchkeeping engineer if the running machinery is operating at slightly high temperature but everything else appears ok?

Ваш ответ правильный:

It should be brought to the attention of the Chief Engineer so that remedial action can be decided upon.
39

Select the option which best describes the primary duty of a watch-keeping engineer:

Ваш ответ правильный:

The primary duty of a watch-keeping engineer is to maintain constant surveillance of the main engine and auxiliary machinery.
40

Why is it important that a transmitter has been correctly installed at the correct location?

Ваш ответ правильный:

The control system is depending on the best possible process signal.
41

OPA-90 notification requirements:

Ваш ответ правильный:

Notify as soon as you have knowledge of any spill, or threat of a spill.
42

With reference to diesel engine ancillary system operation, which one of the given statements is true?

Ваш ответ правильный:

The normal jacket water temperature before the jacket water cooler is approximately 80 to 90 °C.
43

What is the correct understanding of the term “Bending moments” when applied to ships?

Правильный ответ:

The longitudinal Bending Moment at any section within the ship is the total moments tending to alter the longitudinal shape of the ship.

Ваш ответ:

The Bending Moments of a ship are the forces acting on the ship causing it to hog and sag.
44

What would the First Engineer require?

Ваш ответ правильный:

The First Engineer would require an inspection of the heating coils.
45

If Mouth-to-Mouth (M-T-M) ventilation by itself is unsuccessful and the casualty’s heart stops, or has stopped beating, you must perform External Chest Compression (ECC) in conjunction with M-T-M. What is the rythm when performing M-T-M in combination with ECC with one First Aider only?

Ваш ответ правильный:

15 compressions followed by 2 full ventilations.
46

A safety valve is sufficient to prevent a BLEVE:

Ваш ответ правильный:

Wrong, if the valve is wrongly set.
47

When a fire breaks out in the accommodation, cargo holds or on deck, who is in charge of the fire fighting operations?

Ваш ответ правильный:

The person who is designated in the muster list.
48

For how long and at what speed is a fully loaded lifeboat designed to operate in calm weather?

Ваш ответ правильный:

6 knots for 24 hours.
49

Which of the survival craft listed below is equipped with a buoyant line, not less than 50 m in length, of sufficient strength to tow a liferaft?

Ваш ответ правильный:

Rescue boat.
50

What is the main theme of modern safety practice?

Ваш ответ правильный:

Making use of Risk Assessment as a means to improving safety.
51

What do you understand by the term “Risk Assessment”, and how would this be carried out on board?

Ваш ответ правильный:

Identify the hazards, quantify the risks, put control measures in place, monitor the work activity and review.
52

What is the minimum number of channels required for the portable two-way VHF’s for survival craft?

Ваш ответ правильный:

Channels 6, 13 & 16.
53

Which of these weapons are widely available and commonly used by criminals and terrorists to further their aims?

Ваш ответ правильный:

Gun.
54

Ship Security Plans all look the same:

Ваш ответ правильный:

False.
55

Which of the following alternatives summarise the benefits of using high voltage on ships?

Ваш ответ правильный:

Smaller conductors, machines and switchgear.
56

Personnel in a high voltage switchroom smell rotten eggs. What may this indicate?

Ваш ответ правильный:

Problems with a gas (SF6) circuit breaker.
57

Personnel in a high voltage switchroom smell ozone. This is likely to indicate which of the following?

Ваш ответ правильный:

Arcing at badly connected bus bars.
58

How is the condenser cooling water flow regulating valve automatically controlled in a vapour compression refrigeration system?

Ваш ответ правильный:

By the compressor discharge pressure.
59

What would be considered to be the normal service life for rolling contact bearings fitted to a large turbocharger for a diesel engine?

Ваш ответ правильный:

8 000-12 000 hours.
60

What is the main reason for keeping engine lubricating oil viscosity within recommended limits?

Ваш ответ правильный:

To ensure the strength of the oil film is sufficient to keep lubricated surfaces apart.
61

A slow speed diesel engine is fitted with a slow turning facility. How would the slow turning normally be set to operate?

Ваш ответ правильный:

It should automatically operate before the normal start sequence following an engine stopped period of more than 20 to 30 minutes when manoeuvring.
62

An air compressor is being refitted in the engine room. The compressor and motor are coupled using a flexible coupling and are mounted on a common “skid” which fixed to the deck with resilient mountings. Which of the statements, from the options given, relating to the alignment of the motor and compressor is true?

Ваш ответ правильный:

Shims should be fitted between the motor and compressor feet and the skid to ensure correct vertical, horizontal and parallel alignment of the coupling halves before it is bolted up.
63

While alongside at a repair berth a new section of seawater pipe has been fabricated in a shoreside workshop from drawings supplied by the vessel. During fitting of the pipe by ship’s engineers it is noted that the pipe is too short leaving a gap of about 8mm between the flange faces. What action should be taken to remedy this problem?

Ваш ответ правильный:

The pipe should be returned to the shoreside workshop for modification or to be remade to the correct dimensions.
64

Modern slow speed, two stroke diesel engines often have locating pins or pegs to keep the piston rings in a fixed position. Why is this arrangement used?

Ваш ответ правильный:

It avoids the risk of the ends of the piston rings being forced out by the gas pressure and catching on the scavenge ports.
65

Large slow speed diesel engines are usually of the crosshead type and have various arrangements to deliver lubricating oil directly to the crosshead bearings and guides to ensure adequate lubrication. Why are the crosshead bearings considered differently to the other bearing in this type of engine in respect of lubrication requirements?

Ваш ответ правильный:

The running surfaces oscillate relative to each other during operation rather than rotate and therefore full film hydrodynamic lubrication is not possible.
66

A seawater pump requires overhaul but there are no spare wear rings for the casing and impeller. It is decided that new wear rings will be fabricated onboard using the ship’s lathe. What would be the most suitable material to use to fabricate the rings onboard?

Ваш ответ правильный:

Aluminium brass.
67

A new cylindrical brass bearing sleeve for a pump shaft is found to be a few millimetres too long for the housing and needs to be adjusted to the correct length. Which will be the best method to use to reduce the length of the sleeve to the correct dimension?

Ваш ответ правильный:

Remove the excess length using the ship’s lathe.
68

What is the anticipated rolling period of a ship with a large initial Transverse Metacentric Height (GM) and would there be any associated dangers to consider?

Ваш ответ правильный:

Short sharp period of roll associated with breaking lashings and shifting cargo.
69

During maintenance of a piston rod stuffing box on a large, slow speed diesel engine it is usual to measure the butt gaps between the sealing ring and scraper ring segments. What would be the effect of these gaps being too small?

Ваш ответ правильный:

If the gaps are too small they could close due to the radial wear of the rings before the next scheduled overhaul preventing the rings from contacting the piston rod and sealing it.
70

With the set point at the actual desired value, a temperature control system is giving an unacceptably large offset (difference between set point and measured value) on high load resulting in a low system temperature. Which of the actions given in the options should be taken to reduce this effect and therefore achieve closer control of the temperature?

Правильный ответ:

Reduce the width of the proportional band for the controller.

Ваш ответ:

Increase the width of the proportional band for the controller.
71

A vapour compression refrigeration system is usually fitted with a number of devices to give protection and control of the system. Which of the methods given in the options should be used to test the high pressure cut out during routine maintenance and checking of the system?

Ваш ответ правильный:

Gradually shut in the condenser cooling water valve or the condenser refrigerant inlet valve while closely monitoring the compressor discharge pressure.
72

Some large slow speed diesel engines have jack bolt arrangements for retaining the main bearing top keep in place rather than the more conventional stud bolts. How does this arrangement affect the maintenance and checking procedures for the tie rods on the engine?

Ваш ответ правильный:

The tie rods should be fully tensioned before the jacking bolts are loaded to avoid overload of the bearing caps and frame structure.
73

When checking the closed butt gap clearance of new piston rings prior to fitting onto the piston it is normal to try the rings in the liner so that the gap can be measured. From the options given select the best part of the liner to use to carry out these checks.

Ваш ответ правильный:

Near the bottom of the liner.
74

With reference to the installation of pressure gauges for steam systems. Complete the following statement from the options given. To protect a bourdon tube type pressure gauge which is to be fitted to a steam line it should:

Ваш ответ правильный:

Be fitted with a siphon loop between it and the steam pipe.
75

During maintenance of a pneumatically operated, diaphragm actuated control valve the diaphragm is found to be split. Select, from the options given, a suitable material to use to make a temporary replacement if there is no spare diaphragm available.

Ваш ответ правильный:

Natural rubber sheet of approximately the same thickness and elasticity as the original diaphragm material.
76

A standard outside micrometer requires regular maintenance, including calibration, in order to ensure accuracy of measurement. How is the accuracy of this type of instrument normally checked? Select the answer from the options given.

Ваш ответ правильный:

By measuring a standard gauge block or rod at a common temperature.
77

What would be the correct form of response to the question: “What is the visibility in your position?”

Ваш ответ правильный:

Visibility in my position is two hundred meters.
78

What would be understood by the message “A yacht has capsized in heavy seas”?

Ваш ответ правильный:

The message means the yacht has been overturned in heavy seas.
79

Why are accommodation spaces separated from the remainder of the ship by thermal and structural boundaries?

Ваш ответ правильный:

To provide means of escape for the passenger and crew.
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