OCTO Exit Exam Question and Answer updated set - 9

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121.  With reference to liquefied gas operation, what is the term “rollover” used to describe

A.   When two or more stratified layers of different density LNG in the same tank suddenly mix together causing

B.   Vapor pockets forming at the bottom of a half-filled tank

C.   Custody transfer at the terminal

D.   Moving LNG from one tank to another


122.  What does code R stand in ship shore safety checklist

a)   Remarks

b)   Request

c)   Require

d)   Re-checked


123.  Black oils are generally

a)   Static accumulators

b)   Static non- accumulators

c)   Both

d)   None of the above


124.  The gas regulating valve should be opened very slowly in order to avoid:

a)   Back flow gas

b)   Water carries over

c)   Noise

d)   Vibrations


125.  In crude oil tankers, the gas detectors installed should be

a)   Correct electrical classification

b)   Weather proof

c)   Corrosion resistant

d)   All of the above


126.  If the flash point of an oil cargo is 580C, it is said to be

a)   Volatile

b)   Non-volatile

c)   Toxic

d)   None of the above


127.  Which is the basic safety device fitted on the deck inert gas line to monitor the supply condition of the inerted tanks and pipelines of supply of gas?

a)   The inert gas low pressure alarm

b)   The inert gas high temperature alarm

c)   The inert gas low flow alarm

d)   All the above (A), (B) and (C)


128.  Which of these is a positive displacement pump?

a)   Gear

b)   Reciprocating

c)   None of the above

d)   Both (A) and (B)


129.  What is the purpose of a “part flow system” installed on some oil tankers?

a)   The Part Flow system makes it possible to discharge dirty ballast below the water line on older tankers.

b)   The Part Flow system makes it possible to observe the discharge visually for oil content, on older tankers with discharge below the waterline.

c)   The Part Flow system makes it possible to observe the discharge visually for oil content, even in darkness.

d)   The Part Flow system makes it possible to measure the oil content, even if the Oil Discharge Monitoring Equipment is not working.


130.  Who should attend during connection of cargo oil transfer arms/hoses

a)   Pump man

b)   Responsible deck officer

c)   Able Seaman

d)   Bosun


131.  During cargo operations, a wind blowing may ____

a)   Lower the temperature of the oil cargo

b)   Form eddies containing petroleum vapor

c)   Increase air pressure in a cargo tank

d)   Decrease air pressure in a cargo tank


132.  In oil tankers, there are __ foam boxes on the cargo deck

a)   Two

b)   Three

c)   Four

d)   Five


133.  In IG system, ideally the blower casing should be ____ split with split bearings

a)   Horizontally

b)   Vertically

c)   Angularly

d)   None of the above


134.  Before arriving in a port where it is intended to crude oil wash the tank washing system should be pressure tested to ____

a)   150% of the working pressure

b)   125% of the normal working pressure

c)   75% of the normal working pressure

d)   The normal working pressure


135.  LOT is defined as both a procedure and a practice

a)   Load on Top

b)   Load on tanks

c)   Load on Transverse

d)   Load on Table


136.  The minimum oxygen required for combustion

a)   5%

b)   16%

c)   8%

d)   21%


137.  The __ should be fitted with suitable inspection & drainage arrangements

a)   Mast riser

b)   PV valve

c)   PV breaker

d)   All the above


138.  According to the regulations in force, one of the following stripping devices is a demand on a product oil/crude oil tankers having Cargo Oil pumps in the pump room. Which one?

a)   Stripping pump

b)   Ejector

c)   Not any particular

d)   Vacuum stripping system


139.  The tank washing machines can deliver sprays of water at various temperatures and pressures that are dictated by the type of cargo carried, reasons for cleaning are as follows:

a)   Quick bottom wash through gas-freeing and tank entry for hot work.

b)   Removed residue when used as COW machine while carrying crude in a smaller tanker.

c)   Both of the above (A) and (B)

d)   None of the above.


140.  How can you determine which grades of cargo a tank vessel is permitted to carry?

a)   Check the loading order

b)   Ask the supervisor or terminal representative

c)   Examine the cargo tanks and fittings

d)   Refer to the Vessel’s Certificate of Inspection


141.  Which safety device fitted on the insert gas scrubber tower to monitor the efficient operation of the plant?

A.   The inert gas low flow alarm

B.   The scrubber tower high level alarm

C.   The scrubber tower low pressure &non flow alarm of cooling tower

D.   Both of B & C


142.  The tank washing machines for crude oil washing shall be ________ mounted and shall be of a design acceptable to the administration.

a)   Temporarily

b)   Permanently

c)   Portable

d)   None of the above


143. The type of remote-controlled valves most commonly used on product oil/crude oil tanker are

a)   Ball valves and discharging valves

b)   Gate valves, globe valves and butterfly valves

c)   Globe valves, suction valves and draining valves

d)   Butterfly valves


144.  In pump rooms and pipe tunnels “flameproof” electric light fittings are generally fitted. This means that

a)   The fitting is completely gas tight and no gas can enter into contact with the bulb and electric connections

b)   Gas may enter but even if an explosion takes place the fitting is so strong that the explosion will be contained within it and will not blow out

c)   The electrical supply will disconnect automatically in case of fire

d)   Even if fire occurs it will not consume the fitting


145. The procedure of introducing an appropriate liquid into a vessels tank to test for hydrocarbon, color and other contaminants. This test is done by physically pouring the liquid down vessel tank bulkheads and trapping a portion on filter paper. This test is also done on vessels, steam coils and sumps.

a)   Washing of walls

b)   Clean sediment test

c)   Wall wash test

d)   Cargo residue test.


146.  Fixed foam monitors having a locking angle position for every _____

a)   10

b)   9

c)   8

d)   7


147.  Inert Gas System (IGS): A mechanical method of introducing inert gas into a vessels tank in all types of tankers

a)     True

b)   False


148.  A ship with an IAPP (International Air Pollution Prevention Certificate)

a)     Does not need an IEE Certificate

b)    The IAPP and IEE Certificates both are needed when applicable and the existence of one does not eliminate the need for the other one.

c)     Both IAPP and IEE Certificates should be issued by the same Recognized organization

d)    None of the above



149. To ensure proper seating when closing a valve on a tank, what position should the valve be in?

a)     Closed opened a half turn and then closed again

b)    Set up as tight as possible by hand

c)     Set up tight using a valve wrench

d)    Closed against the stop and the locking pin inserted


150.  The use of steam driven ejectors for ventilation of cargo tanks having flammable vapor in them is not recommended now a days due to;

a.    Steam at high velocity may generate static electricity which might cause incentive sparks?

b.   It being not a very effective system for tank ventilation?

c.    It is rather expensive to waste steam?

d.   It might cause burns to unwary personnel?

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