Тест по Marine Fuel Handling (CES v5.0)

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Right answers:
1

A centrifuge is used to give more effective separation of water and dirt from fuel. How does it achieve this better separation?

Your answer is correct:

By increasing the separating force by centrifugal action.
2

A fuel oil tank is fitted with a sounding pipe, which is used from within the engine room. Which one of the following fittings given must be fitted?

Your answer is correct:

Self closing cock with test cock.
3

A purifier is used to clean the fuel prior to delivering it to the service tank for use in the engine. Which one of the options shows what should be removed from the fuel by the purifier?

Your answer is correct:

Water and dirt.
4

Back flushing filters are sometimes fitted in the onboard fuel oil treatment system. Which one of the following options best describes what the unit is normally back flushed with?

Your answer is correct:

Cleaned fuel.
5

Centrifuges are often used in pairs to give a combined cleaning effect on fuel oil. Which of the options given is the preferred arrangement for these combinations?

Correct answer:

Purifier and clarifier in series.

Your Answer:

Two clarifiers in series.
6

Chemical additives and stabilizers are sometimes used as part of the fuel oil treatment. Which one of the following best describes how fuel stabilizers are intended to work?

Your answer is correct:

Preventing the fuel from aging.
7

Edge filters are used for removal of very small particles. Which one of the following best describes where you would be likely to find edge filters fitted in the fuel oil system?

Your answer is correct:

Before fuel injection equipment.
8

Filters are often fitted as part of the fuel oil cleaning arrangement. Which one of the following best describes why duplex (double) filter units are normally fitted?

Your answer is correct:

To allow cleaning without interrupting the fuel supply.
9

From the options given, select all of those, which are normally fitted to a heavy fuel oil storage tank:

Your answer is correct:

Sounding pipe.
10

Fuel oil treatment systems sometimes include ultrasonic devices. Which one of the following best describes how these devices improve the condition of the fuel?

Your answer is correct:

They generate high energy vibrations, which break down contaminant particles and heavy molecules.
11

Fuel tank vent pipes positioned on the open deck are normally fitted with an automatic valve. What is the purpose of this valve?

Your answer is correct:

To prevent water entering the tank during rough weather.
12

High density fuels cannot be treated with a conventional purifier to remove water. Which one of the given options is the reason for this?

Your answer is correct:

Insufficient density difference between water and fuel.
13

Incompatibility is the term used to describe which one of the fuel oil storage problems given in the answer options?

Your answer is correct:

Sludge formation following mixing of two normally stable fuels.
14

MARPOL Annex I deals with the prevention of which of the following forms of marine pollution from ships?

Your answer is correct:

Pollution by oil.
15

MARPOL Annex I requires new ships with a total bunker capacity greater, than a certain limit to have fuel oil tanks positioned so that no part of the tank is formed by the outer hull plating. What is the limit?

Correct answer:

600 m3.

Your Answer:

150 m3.
16

MARPOL Annex VI deals with the prevention of which one of the following forms of pollution from ships?

Your answer is correct:

Air pollution due to exhaust emissions.
17

MARPOL allows fuel oil to be stored within the fore peak and after peak tanks. True or false?

Your answer is correct:

False.
18

Mechanical homogenisers are sometimes fitted as part of the fuel oil treatment arrangement. Which one of the following options given best describes the effect of a homogeniser on fuel oil?

Correct answer:

Grinds solid particles down in size.

Your Answer:

Separate solids and water from the fuel.
19

Safe operation and pollution prevention procedures should be contained in the ships Safety Management Manual as part of the company’s Safety Management System. Which legislation requires this?

Your answer is correct:

ISM Code.
20

Some centrifuges used for oil have a solenoid valve in the water outlet, which is controlled by a water sensor in the oil outlet. What is this type of centrifuge used for?

Your answer is correct:

Treating high density residual fuel oils.
21

Stabilizers are sometimes used as part of the fuel treatment to improve performance. Which of the given options best describes the action of fuel stabilizers?

Your answer is correct:

They reduce the oxidation rate in storage.
22

Suction strainers are fitted to most fuel oil treatment systems. Which one of the following best describes the main purpose of a suction strainer?

Your answer is correct:

To protect the pumps from large solid particles.
23

The International Maritime Organization’s pollution legislation, MARPOL, contains six annexes dealing with different aspects of marine pollution. Which of the options is the MARPOL annex, which deals with air pollution by ships?

Your answer is correct:

Annex VI.
24

The International Maritime Organization’s pollution legislation, MARPOL, contains six annexes dealing with different aspects of marine pollution. Which of the options is the annex dealing with oil pollution by ships?

Your answer is correct:

Annex I.
25

The International Safety Management Code, the ISM Code, as it is commonly referred to, deals with which of the given options?

Your answer is correct:

The safe operations of ships and the prevention of pollution by ships.
26

The main purpose of purging cargo tanks with Inert Gas (IG) is to prevent explosive atmosphere in the tanks. What are the standard requirements for oxygen content in the IG supply line and in the cargo tanks?

Your answer is correct:

Maximum 5 % and 8 % respectively.
27

The number of fuel oil tanks in a ship is decided upon by considering a number of factors. Which one of the options is one of the most important factors, which would be taken into consideration?

Correct answer:

Segregation of fuel types.

Your Answer:

Fuel transfer pump capabilities.
28

The purpose of the fuel settling tank is to allow water and dirt in the fuel to separate so it can be drained off. Which of the following factors is the main reason for the separation occurring?

Correct answer:

Difference in density between the fuel and the water and dirt.

Your Answer:

Difference in viscosity between the fuel and the water and dirt.
29

When a centrifuge is setup as a fuel oil clarifier it normally only separates solids from the dirty fuel. How is the setup of a clarifier different to that for a purifier?

Your answer is correct:

The water outlet is closed off by the top cover of the disc stack.
30

When centrifuges are setup as fuel oil purifiers they often have gravity discs or gravity plugs fitted. How does fitting different densities to be treated?

Correct answer:

They control the position of the interface.

Your Answer:

They alter the height of the disc stack.
31

When used in relation to fuel oil, the term instability refers to which one of the following situations?

Your answer is correct:

Possibility, that fuel components will separate during storage.
32

Which of the following options best completes the following statement? The main reason for heating fuel oil before it enters a purifier is to:

Your answer is correct:

Increase the density difference between fuel and water.
33

Which of the following options best describes the term “incompatible” when applied to fuel oil?

Your answer is correct:

The fuel becomes unstable and form sludge’s when mixed with another fuel.
34

Which of the following options describes a feature required, where sight glasses are used to show fuel oil tank contents?

Your answer is correct:

Self closing cocks or valves.
35

Which of the following options gives the maximum temperature allowed for the heating medium in a fuel oil tank?

Correct answer:

220 °C.

Your Answer:

180 °C.
36

Which of the following options would you describe as being a double bottom tank?

Your answer is correct:

A tank, formed between the hull bottom plating and the inner floor plating.
37

Which one of the fittings listed would you expect to find on a fuel oil tank air vent positioned on an open weather deck?

Your answer is correct:

Vent head with float shut off valve or similar.
38

Which one of the following best describes how water is removed from fuel oil when static filter modules are used instead of centrifuges?

Correct answer:

They contain coalesce elements.

Your Answer:

They contain edge filter elements.
39

Which one of the following describes the normal way of removing accumulated water from a fuel oil settling tank?

Your answer is correct:

Regular draining using the drain cock.
40

Which one of the following options best describes the conditions under which microbial contamination of distillate fuel is most likely to occur?

Your answer is correct:

Water is present in the fuel.
41

Which one of the following options describes the aim of legislative changes that require many ships to have fuel oil tanks sited away from the ship’s side and bottom?

Your answer is correct:

Reduce pollution in the event of collision or grounding.
42

Which one of the following options describes, when remote closing valves are required to be fitted in fuel oil tank outlet lines?

Your answer is correct:

When the fuel oil tank is in the same space as the machinery it supplies.
43

Which one of the following options is a fitting, that will always be found on fuel oil service and settling tanks?

Your answer is correct:

Self closing drain valve or cock.
44

Which one of the following options must be fitted on an air vent for a fuel oil tank?

Your answer is correct:

Flame screen.
45

Which one of the following would be the normal way to remove microbial contamination from fuel oil?

Correct answer:

Treatment with biocides.

Your Answer:

Treatment with fuel stabilizers.
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