Test Online for Seamen about Flue Gas Plant (CBT 0008)

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Правильні відповіді:
1

According to the Fire Safety Systems Code what is the maximum oxygen content permitted in the cargo tanks of an oil tanker?

Ваша відповідь правильна:

8 % by volume.
2

According to the Fire Safety Systems Code which one of the following would be considered a safe amount of oxygen in the output from an inert gas plant?

Ваша відповідь правильна:

Less than 5 % oxygen.
3

According to the instructions in this module, which of these options would be carried out first when starting up a flue gas plant?

Ваша відповідь правильна:

Open the boiler uptake valve.
4

If the inert gas at the blower outlet gets too hot a high temperature alarm is given. What will happen if the temperature of the gas continues to rise?

Ваша відповідь правильна:

The inert gas blowers will stop and the gas regulating valve closes.
5

In an oil cargo tank in which there is a mixture of hydrocarbon gas and air, which of the following is the best definition of the “Lower flammable limit” (LFL)?

Ваша відповідь правильна:

It is the concentration of hydrocarbon vapour below which there is insufficient gas in the mixture to support combustion.
6

In an oil cargo tank in which there is a mixture of hydrocarbon gas and air, which of the following is the best definition of the “upper flammable limit” (UFL)?

Ваша відповідь правильна:

It is the concentration of hydrocarbon gas above which there is insufficient oxygen to support and propagate combustion.
7

In relation to oil tanker cargo spaces which one of the following is the best definition of the expression “purging”?

Ваша відповідь правильна:

To blow inert gas into a tank to reduce the oxygen or hydrocarbon gas level.
8

In some types of inert gas plants using flue gas, air is supplied to the boiler uptake valves. What is the reason for this?

Ваша відповідь правильна:

To ensure no flue gas leaks pass the uptake valves when the plant is shut down.
9

In which one of the following IMO publications would you find the requirements for the design of a new inert gas system?

Ваша відповідь правильна:

International Code for Fire Safety Systems (FSS Code).
10

Many oil tankers are fitted with an inert gas system supplying their cargo tanks. What is the main purpose of introducing inert gas into a cargo tank?

Ваша відповідь правильна:

To create a non-explosive atmosphere in the tank.
11

On an oil tanker how long must the deck water seal supply be left on after the inert gas system is shut down?

Ваша відповідь правильна:

It must be left running continuously to maintain an adequate seal.
12

On inert gas plants when the scrubber water flow drops below a certain rate an alarm is given. What will happen if the flow rate drops further?

Ваша відповідь правильна:

The inert gas blowers will stop and the gas regulating valve closes.
13

On some inert gas plants using flue gas the speed of the blowers is variable. Which of the following is the best explanation for fitting variable speed blowers?

Ваша відповідь правильна:

The pressure of the gas delivered to deck can be controlled.
14

Some oil tankers are fitted with one large inert gas blower and one smaller blower. Which of the following is the best explanation for fitting a small blower?

Ваша відповідь правильна:

It can be used when topping up the gas pressure at sea.
15

The power supply to a flue gas type inert gas plant is normally left on, even when the plant is shut down. Which of the following best describes the reason for this?

Ваша відповідь правильна:

Some alarm functions must be operational even when the plant is not.
16

What is the Fire Safety Systems Code requirement regarding non return devices in the inert gas main for inert gas systems on oil tankers?

Ваша відповідь правильна:

There must be at least two devices one of which should be a water seal type.
17

What is the main risk associated with dilution of a normally inerted cargo oil tank atmosphere with fresh air?

Ваша відповідь правильна:

During the process the atmosphere may be within the flammable range for some of the time.
18

What is the purpose of the deck water seal fitted to an oil tanker’s inert gas system?

Ваша відповідь правильна:

To prevent backflow of hazardous vapours into the gas safe areas.
19

What is the purpose of the pressure/vacuum breaker fitted to an oil tanker’s inert gas system?

Ваша відповідь правильна:

To relieve excess pressure or vacuum in the inert gas main.
20

When an oil tanker has a flue gas type inert gas plant which is also used for gas freeing of cargo tanks where is the air normally drawn from?

Ваша відповідь правильна:

The blower fresh air inlet.
21

When entering any part of the inert gas system to carry out maintenance or inspections, which of the following is the main danger to personnel?

Ваша відповідь правильна:

Oxygen deficiency.
22

When opened up the scrubber unit of a flue gas type inert gas plant is found to contain a mattress of polypropylene mesh. Which of the following is the best explanation for this mesh being there?

Ваша відповідь правильна:

It is fitted to the scrubber to dry the gas.
23

When the inert gas plant on an oil tanker suffers an automatic shutdown which one of the options below is true of the seawater pumps and blowers?

Ваша відповідь правильна:

Only the seawater pumps are left running.
24

Which of the following best describes the action to be taken by the watchkeeper as soon as the blower in a flue gas type inert gas plant is stopped during shut down of the plant?

Ваша відповідь правильна:

The blower washing water should be turned on.
25

Which of the following best describes the most likely cause of low deck main pressure while a flue gas type inert gas plant is running?

Ваша відповідь правильна:

Cargo discharge rate in excess of the blower output.
26

Which of the following best describes the most likely cause of the boiler soot blowers failing to work while a flue gas type inert gas plant is running?

Ваша відповідь правильна:

The interlock is operating to prevent excessive soot entering the inert gas.
27

Which of the following best describes the most likely initial consequence of low boiler load when a flue gas type inert gas plant is running?

Ваша відповідь правильна:

A high oxygen level.
28

Which of the following best describes the reason for the fixed oxygen meter being fitted close to its sampling point?

Ваша відповідь правильна:

To reduce the time between the sample being taken and analysed.
29

Which of the following is the best definition for “inert gas”, as used to protect the cargo spaces of oil tankers?

Ваша відповідь правильна:

It is a gas containing insufficient oxygen to support the combustion of hydrocarbons.
30

Which of the following is the best explanation of the purpose of the scrubber unit in a flue gas type inert gas plant?

Ваша відповідь правильна:

To cool the gas while removing soot particles and sulphur dioxide.
31

Which of the following is the main purpose of filling the free space above the oil cargo onboard a tanker with inert gas?

Ваша відповідь правильна:

To keep the tank atmosphere outside the flammable range.
32

Which of the following is the typical oxygen level in the exhaust gas that can be achieved from good combustion in a ship’s boiler?

Ваша відповідь правильна:

4 to 5 %.
33

Which of the following operations is carried out last when shutting down a typical flue gas plant?

Ваша відповідь правильна:

Shut down the scrubber water pump.
34

Which one of the following is a maintenance problem that can be seen during an external examination of the blower of an inert gas plant?

Ваша відповідь правильна:

Cracking.
35

Which one of the following is likely to happen if the oxygen content of the inert gas being supplied to the cargo spaces of an oil tanker rises above 8 percent and the “high-high” oxygen alarm sounds?

Ваша відповідь правильна:

The gas regulating valve will automatically close, and the vent or recirculation valve will open.
36

Which one of the following is the generally agreed reason for the rise in explosions experienced in the 1960s and 1970s, as oil tankers became larger?

Ваша відповідь правильна:

Static electricity.
37

Which one of the following is the minimum required capacity of the blowers fitted to an oil tanker’s inert gas plant, as a proportion of the ship’s maximum cargo discharge rate?

Ваша відповідь правильна:

125 % in total.
38

Which one of the following would be the best gas to use to zero the fixed oxygen analyser monitoring an inert gas plant?

Ваша відповідь правильна:

Nitrogen.
39

Which one of the following would you expect to happen on an oil tanker if the pressure in the inert gas main falls to about 50 mm Water Gauge during cargo discharge operations?

Ваша відповідь правильна:

The cargo pumps shutdown automatically.
40

Which term is used to identify the operation whereby inert gas is introduced into a cargo tank in order to reduce the oxygen content throughout the atmosphere of the tank to 8 % or less by volume?

Ваша відповідь правильна:

Inerting.
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