OCTCO/OCTF - Oil and Chemical Tanker Cargo Operations Exit Exam Questions - Set 1

Question 1

What MARPOL Annex regulates prevention of oil pollution from tankers?

Accepted Answer

A: MARPOL Annex I

Answer

B: MARPOL Annex II

Answer

C: MARPOL Annex V

Answer

D: MARPOL Annex III

Question 2

What is the maximum oxygen content allowed in inert gas supplied to cargo tanks?

Accepted Answer

B: 5% by volume (max 8% inside tanks)

Answer

A: 21%

Answer

C: 0%

Answer

D: 15%

Question 3

What operation uses crude oil jets to clean sludges from tank walls during discharge?

Accepted Answer

A: Crude Oil Washing (COW)

Answer

B: Water flushing

Answer

C: Steam cleaning

Answer

D: Solvent soaking

Question 4

What condition is mandatory before starting Crude Oil Washing (COW)?

Accepted Answer

D: Cargo tank must be inerted with O2 < 8%

Answer

A: Boiler off

Answer

B: Tank open to air

Answer

C: Dry dock

Question 5

What system monitors and controls oily water discharge overboard from slop tanks?

Accepted Answer

D: Oil Discharge Monitoring and Control System (ODMCS)

Answer

A: Salinometer

Answer

B: OWS 15 ppm alarm

Answer

C: Echo sounder

Question 6

What is the maximum instantaneous rate of oil discharge allowed outside Special Areas under MARPOL Annex I?

Accepted Answer

C: 30 liters per nautical mile

Answer

A: 100 L/nm

Answer

B: Zero

Answer

D: 15 ppm

Question 7

What device stops hydrocarbon gas backflowing from cargo tanks into the machinery space?

Accepted Answer

B: Deck Water Seal and Non-Return Valve

Answer

A: Butterfly valve

Answer

C: Fan

Answer

D: Flame screen

Question 8

What instrument measures flammable vapor concentration as a percentage of LEL?

Accepted Answer

A: Explosimeter (Combustible Gas Indicator)

Answer

B: Dip tube

Answer

C: Oxygen Analyzer

Answer

D: Refractometer

Question 9

What is Reid Vapor Pressure (RVP)?

Accepted Answer

A: Standard measure of crude oil vapor pressure at 100°F (37.8°C)

Answer

B: Air pressure

Answer

C: Hydraulic pressure

Answer

D: Steam pressure

Question 10

What device protects oil cargo tanks against overpressure or vacuum structural damage?

Accepted Answer

A: High-velocity Pressure/Vacuum (P/V) valve

Answer

B: Gate valve

Answer

C: Quick closing valve

Answer

D: Storm valve

Question 11

Under STCW Code Table A-V/1-1-1, what is the mandatory requirement regarding regulatory compliance and STCW code requirements during Basic Oil & Chemical Tanker operations?

Accepted Answer

A: Strict compliance with approved safety procedures and flag state regulations

Answer

B: Optional adherence based on vessel size

Answer

C: Applicable only during drydock operations

Answer

D: Verbal recommendation without documentation

Question 12

What specific safety precaution must be observed when managing regulatory compliance and STCW code requirements for Basic Oil & Chemical Tanker on board?

Accepted Answer

B: Conducting a thorough risk assessment and briefing all involved personnel prior to starting work

Answer

A: Proceeding without informing the officer on watch

Answer

C: Disabling automated safety alarms to save time

Answer

D: Delegating tasks exclusively to untrained crew members

Question 13

What does ISGOTT stand for?

Accepted Answer

A: International Safety Guide for Oil Tankers and Terminals

Answer

B: Integrated Offshore Safety

Answer

C: Indian Safety Group

Answer

D: System for Gas Safety

Question 14

What is the function of an Inert Gas Scrubber tower?

Accepted Answer

A: Cool flue gas and remove soot and SO2 particles

Answer

B: Generate oxygen

Answer

C: Separate oil and water

Answer

D: Heat oil

Question 15

What is Load on Top (LOT) procedure?

Accepted Answer

D: Decanting clean water under settled slops and loading fresh crude directly on top

Answer

A: Pumping without sounding

Answer

B: Overfilling tanks

Answer

C: Heavy cargo over light cargo

Question 16

What risk occurs if static electricity accumulates during initial filling of an un-inerted tank?

Accepted Answer

B: Electrostatic spark ignition causing tank explosion

Answer

A: Corrosion

Answer

C: Freezing

Answer

D: Cavitation

Question 17

What is the max initial loading rate velocity for static accumulator oils before inlet pipe is submerged?

Accepted Answer

B: 1 meter per second

Answer

A: No limit

Answer

C: 10 m/s

Answer

D: 50 m/s

Question 18

What safety system automatically shuts down cargo pumps and closes valves in emergencies?

Accepted Answer

A: Emergency Shutdown System (ESD)

Answer

B: Windlass brake

Answer

C: Boiler valve

Answer

D: Bilge valve

Question 19

What equipment measures hydrocarbon vapor concentration in zero-oxygen inert atmospheres?

Accepted Answer

D: Tankscope / Infrared Gas Analyzer

Answer

A: Catalytic explosimeter

Answer

B: Hydrometer

Answer

C: Litmus paper

Question 20

What is total oil discharge limit for existing tankers during ballast voyage under MARPOL Annex I?

Accepted Answer

D: Max 1/30,000 of total cargo carried on previous voyage

Answer

A: 1/1,000

Answer

B: 100 m3

Answer

C: Zero everywhere

Question 21

What is the function of stripping pumps during cargo discharge?

Accepted Answer

A: Drain remaining oil liquid from tank bottoms and suction lines

Answer

B: Cool main deck

Answer

C: Generate steam

Answer

D: Pump ballast into fuel tanks

Question 22

What safety document is signed by ship officer and shore representative prior to cargo transfer?

Accepted Answer

D: Ship / Shore Safety Checklist (SSSCL)

Answer

A: Waybill

Answer

B: Crew Agreement

Answer

C: Custom Clearance

Question 23

Which international regulation specifies the minimum standard for regulatory compliance and STCW code requirements concerning Basic Oil & Chemical Tanker?

Accepted Answer

C: STCW Code Section A-V/1-1-1 and relevant SOLAS/MARPOL conventions

Answer

A: Port State Control advisory note only

Answer

B: International Load Line Certificate Annex 3

Answer

D: Tonnage Measurement Convention 1969

Question 24

In the event of an emergency involving regulatory compliance and STCW code requirements during Basic Oil & Chemical Tanker tasks, what immediate action is required?

Accepted Answer

D: Raise the alarm, notify the Officer of the Watch, and execute assigned muster list duties

Answer

A: Wait until the end of the watch to log the issue

Answer

B: Evacuate the vessel immediately without informing the bridge

Answer

C: Attempt to resolve the incident silently without raising the alarm

Question 25

What gas present in crude oil vapor is highly toxic with rotten egg smell at low levels?

Accepted Answer

C: Hydrogen Sulfide (H2S)

Answer

A: Methane

Answer

B: Nitrogen

Answer

D: Carbon Dioxide

Question 26

What is modern TLV-TWA exposure limit for Hydrogen Sulfide (H2S)?

Accepted Answer

A: 1 ppm to 5 ppm

Answer

B: 1000 ppm

Answer

C: 5000 ppm

Answer

D: 100 ppm

Question 27

What device isolates cargo tank vapor space while maintaining pressure control?

Accepted Answer

C: Pressure/Vacuum (P/V) breaker or P/V valves

Answer

A: Sounding cap

Answer

B: Open stack

Answer

D: Scupper plug

Question 28

What requirement applies to double hull tankers under MARPOL Annex I?

Accepted Answer

D: Double bottom and wing ballast tanks separating cargo tanks from outer hull

Answer

A: Wood lined hold

Answer

B: Single skin side

Answer

C: Open bilge

Question 29

What action is taken if inert gas oxygen content exceeds 8% during cargo discharge?

Accepted Answer

B: Stop cargo discharge immediately and rectify IG plant fault

Answer

A: Open tank lids

Answer

C: Drain scrubber

Answer

D: Double discharge speed

Question 30

What is purging on an oil tanker?

Accepted Answer

C: Introducing inert gas into an inerted tank to reduce hydrocarbon concentration before gas freeing

Answer

A: Pumping oil to shore

Answer

B: Ballasting

Answer

D: Washing with seawater

Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF) (Set 1)

What MARPOL Annex regulates prevention of oil pollution from tankers?

Questions in OCTCO/OCTF Set 1

Question Discussion & Notes

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