CHEMCO - Advanced Training for Chemical Tanker Cargo Operations Exit Exam Questions - Set 12

Question 1

Where is the electrostatic discharge plate installed?

Accepted Answer

C: At the accommodation entrance on upper deck

Answer

A: Near the cargo manifold

Answer

B: At the forward end of the ship

Answer

D: At the aft part of the ship

Question 2

For Oxygen analyzer, identify the key principle upon which the analyzer is working,

Accepted Answer

D: A difference in the thermal conductivity of the oxygen with respect to air is developed and this causes an imbalance in the resistance.

Answer

A: A Wheatstone bridge circuit is formed using the two wires. It is used to measure a resistance by balancing two legs of the circuit.

Answer

B: The sample of atmosphere is filtered and passed through a diffuser before reaching the two chambers.

Answer

C: One chamber is with a magnetic field and the other without a magnetic field.

Question 3

The ________ depends upon the pressure of contact exerted on live wires.

Accepted Answer

C: impedance

Answer

A: voltage

Answer

B: current

Answer

D: power

Question 4

What is related to the relaxation time of the material in which the electical charges are accumulated?

Accepted Answer

C: That material's conductivity

Answer

A: That material's density

Answer

B: That material's viscosity

Answer

D: That material's flammabilty

Question 5

Operating Principle of the Infrared instrument: identify the key principle that leads to detection of hydrocarbon gas,

Accepted Answer

D: When there is combustible gas present, there is a predictable drop in the output from measurement signal detector because the gas is absorbing light.

Answer

A: The amount of absorption is related to the concentration of the gas and is measured by a set of optical detectors and suitable electronic systems.

Answer

B: The change in the intensity of the absorbed light is measured relative to the intensity of light at a non-absorbed wavelength.

Answer

C: When there is no gas present the signals of reference signal detector and measurement signal detector are balanced.

Question 6

When using a permit to work system one must make how many copies of the permit ?

Accepted Answer

B: Two copies

Answer

A: One copy

Answer

C: Three copies

Answer

D: Four copies

Question 7

A method NOT usually allowed for cleaning up oil spills would be the use of _________.

Accepted Answer

B: dispersants

Answer

A: skimmers

Answer

C: straw

Answer

D: sawdust

Question 8

A liquid-filled pressure vacuum breaker

Accepted Answer

C: is fitted on the inert gas main line of a tanker

Answer

A: is fitted on the tank dome

Answer

B: is fitted on the main deck a tanker

Answer

D: is fitted in the pump room

Question 9

A thermoelectric detector:

Accepted Answer

B: converts heat to electrical energy

Answer

A: Uses a heat sensor uses a fixed temperature stop

Answer

C: detects a rise in tempetrature

Answer

D: uses a fixed temperature stop

Question 10

The vacuum strip system was developed on oil tankers to

Accepted Answer

B: prevent cavitation in centrifugal cargo pumps

Answer

A: remove all hydrocarbon gases from the tanks after discharging

Answer

C: quickly remove rain water collecting on deck

Answer

D: discharge cargo without any human intervention

Question 11

Gas Dispersion through tank vents; There is a potential danger of fire and explosion if the flammable zone with emitted vapor reaches any location where there may be sources of ignition such as the follows; which one of these can be prevented easily by onboard systems?

Accepted Answer

A: Superstructures and accommodation blocks into which the gas can enter through doors, ports or ventilation intakes.

Answer

B: The cargo deck which, although it is usually regarded as free of sources of ignition, is a work area and thoroughfare.

Answer

C: An adjacent jetty which, although it is usually regarded as free of sources of ignition, is a work area and thoroughfare.

Answer

D: Adjacent vessels such as lightering ships, bunker and stores craft, pilot and crew transfer boats.

Question 12

In a float gauge, the float is connected to an indicating device by a ____.

Accepted Answer

B: tape

Answer

A: rope

Answer

C: tube

Question 13

A stripping pump is fitted in the pump room so that

Accepted Answer

A: the last remaining traces of liquid can be pumped out from the tanks, pipelines and pumps

Answer

B: cargo from the tanks can be discharged if the main pumps should fail

Answer

C: the liquids collected in the bilge can be pumped out

Answer

D: slops can be discharged overboard at a slow rate

Question 14

Tanks of tankers do not exceed:

Accepted Answer

C: 0.2 of ship’s length

Answer

A: 0.1 of ship’s length

Answer

B: 0.15 of ship’s length

Answer

D: 0.25 of ship’s length

Question 15

What do you understand from the term "Bleed off COW" ?

Accepted Answer

C: The process of diverting part of cargo discharged for crude oil washing

Answer

A: The process of pressure testing the COW lines onboard

Answer

B: The process of diverting part of cargo discharged for reducing rate

Answer

D: The process of draining oil from the COW lines after washing

Question 16

The pipeline system that has valves fitted on bulkheads is called:

Accepted Answer

B: The free flow system

Answer

A: The direct line system

Answer

C: The ring main system

Answer

D: The free line system

Question 17

Before gas freeing operations the hydrocarbon content is reduced to:

Accepted Answer

D: to 2% or less by volume

Answer

A: to 15% or less by volume

Answer

B: to 10% or less by volume

Answer

C: to 8% or less by volume

Question 18

Turbidity:

Accepted Answer

A: is an optical characteristic that indicates the degree of clarity of a liquid

Answer

B: is a motion characteristic that indicates the degree of clarity of a liquid

Answer

C: is a refractive characteristic that indicates the degree of clarity of a liquid

Answer

D: is a characteristic that indicates the degree of clarity of a liquid

Question 19

Tank bulkheads on a tanker are strengthened using:

Accepted Answer

A: Web frames, transverse webs and stringers.

Answer

B: Longitudinals, transverse webs and stringers.

Answer

C: Web frames, transverse webs and gusset plates.

Answer

D: Gusset plates, transverse webs and longitudinals

Question 20

In capacitance gauges, the probes are placed in an_______

Accepted Answer

A: Open protective tube

Answer

B: tank

Answer

C: enclosed cage

Question 21

What is LEAST likely to be used to strip a cargo tank?

Accepted Answer

A: Centrifugal pump

Answer

B: Eductor

Answer

C: Rotary pump

Answer

D: Reciprocating pump

Question 22

Differential pressure gauge works based on the differential pressure between the vapour and____.

Accepted Answer

B: liquid

Answer

A: Inert gas

Answer

C: air

Question 23

Deep tanks on oil tankers are used normally to carry

Accepted Answer

C: extra bunkers for long international voyages

Answer

A: nothing at all

Answer

B: additional ballast in bad weather

Answer

D: more cargo for increasing freight

Question 24

____ gauges can be used in ships only if the tank is above the deck.

Accepted Answer

A: Differential pressure

Answer

B: Float

Answer

C: Capacitance

Question 25

The main purpose of introducing double hull design in tankers was

Accepted Answer

A: to offer an extra layer of protection against environmental pollution

Answer

B: to increase the light weight of ship and reduce ballast required

Answer

C: to allow ships to navigate with reduced UKC without worrying about pollution

Answer

D: to increase the cargo carrying capacity of the ship with same dimensions

Question 26

Quick Closing Valve: identify the purpose of such a valve,

Accepted Answer

A: Fuel oil gravity tanks must be fitted with valves that can be closed rapidly and remotely in the event of an emergency such as a fire.

Answer

B: Quick closing valves can be wire operated mechanically from outside the engineroom

Answer

C: Quick closing valves can behydraulically or pneumaticallyoperated from outside the engineroom

Answer

D: Quick closing valves are not usedfor throttle purpose

Question 27

Which of the following is true about eductors?

Accepted Answer

C: They sometimes make high vibrations and even lead to pipeline and gauge damage

Answer

A: They can be used only when there is a good level of liquid in the tank to be pumped out

Answer

B: Sea water can be used as drive and crude oil pumped out from the tanks

Answer

D: A long preparation is required before eductor can be put to use

Question 28

Which one of the following is not a piping system found on an oil tanker?

Accepted Answer

B: Integrated system

Answer

A: Ring main system

Answer

C: Direct line system

Answer

D: Free flow system

Question 29

The purpose of a cofferdam between two compartments is to

Accepted Answer

D: prevent different liquids from the two tanks coming in contact in case of a leak

Answer

A: store tools and equipment that are necessary for the adjacent compartments

Answer

B: give access to the bulkhead for inspection and repairs when the tanks are full with liquid

Answer

C: keep a reserve space if capacity of either compartment needs to be increased

Question 30

Which statement about the pressure in a tank being inerted by an inert gas system is TRUE?

Accepted Answer

B: A positive pressure should be maintained at all times.

Answer

A: The maximum pressure permitted is 8 psi.

Answer

C: The pressure must remain within the limits of +5 psi to -1 psi.

Advanced Training for Chemical Tanker Cargo Operations (CHEMCO) (Set 12)

Where is the electrostatic discharge plate installed?

Questions in CHEMCO Set 12

Question Discussion & Notes

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