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BIGF exit exam questions and answers — Set 2

Set 2 of the Basic Training for Ships subject to the IGF Code (BIGF) exit exam bank — 30 of 181 questions, with the correct option marked, and 29 of them also carry a one-line explanation. Read it end to end, jump to a single set, or search it — then sit the same bank as a timed paper. The real DG Shipping exit exam is 30 marks with 15 to pass.

These are the bank's original groupings. Practising deals the whole bank out again every time you reshuffle, so a practice “Set 3” is a different 30 questions each time — the set numbers below are the source file's, and are only used here so the key stays navigable. Options are listed in their original order with fixed letters; when you practise, those move too.

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Set 2 — 30 BIGF exit exam questions with answers

1. _________ is the primary petrochemical building blocks

  • A. kerosene
  • B. none of the above
  • C. Ethylene
  • D. chlorine
Answer: C — Ethylene
Ethylene (C2H4) is the world's primary organic chemical building block, serving as the base precursor for polyethylene plastics, ethylene glycol, and vinyls.

2. Ethane is obtained by cracking____________

  • A. ethane
  • B. naphtha
  • C. none of the above
  • D. both (a) and (b)
Answer: D — both (a) and (b)
Ethane is extracted from natural gas streams or refinery off-gases and thermal cracked in petrochemical plants to produce ethylene.

3. Products obatined from ethylene are

  • A. polyethylene
  • B. polyvinyl chloride
  • C. All of the above
  • D. rubber
Answer: C — All of the above
Ethylene is the primary precursor for polyethylene (HDPE, LDPE), ethylene dichloride (EDC for PVC), ethylene oxide, and synthetic alcohols.

4. Propylene is a petrochemical intermediate used to make which product

  • A. All of the above
  • B. Acetone
  • C. Phenol
  • D. Detergent
Answer: A — All of the above
Propylene is a key chemical intermediate used to synthesize polypropylene plastics, acrylonitrile (acrylic fibers), propylene oxide, and cumene.

5. Butadiene is a _______________ petrochemical intermediaste.

  • A. medium reactive
  • B. none of the above
  • C. high reactive
  • D. low reactive
Answer: C — high reactive
1,3-Butadiene is a highly reactive, flammable conjugated diene petrochemical intermediate that requires polymerization inhibitors during marine transport.

6. Butadiene is used in

  • A. binders
  • B. intermediate in plastics
  • C. paints
  • D. All of the above
Answer: D — All of the above
Butadiene is primarily utilized in the production of synthetic elastomers, styrene-butadiene rubber (SBR) for vehicle tires, and ABS engineering plastics.

7. What are the products from Butadiene?

  • A. Synthetic rubbers
  • B. Polybutadiene
  • C. All of the above
  • D. Styrene
Answer: C — All of the above
Key industrial end-products derived from butadiene include polybutadiene rubber, nitrile rubber (NBR), neoprene, and nylon intermediates.

8. Vinyl Chloride is an easily ___________ used in the manufacture of polyvinyl chloride

  • A. chlorinated gas
  • B. none of the above
  • C. liquefiable
  • D. both (a) and (b)
Answer: D — both (a) and (b)
Vinyl Chloride Monomer (VCM) is a chlorinated gas that is readily liquefied under mild pressure or refrigeration, used to manufacture polyvinyl chloride (PVC).

9. _______________ is an easily liquefiable and chlorinated gas used in the manufacture of polyvinyl chloride

  • A. oxygen
  • B. none of the above
  • C. florine
  • D. Vinyl Chloride
Answer: D — Vinyl Chloride
Vinyl Chloride Monomer (VCM) is an organochloride gas essential to the global plastics industry for manufacturing PVC pipes and construction materials.

10. Vinyl Chloride has a ____________ boiling point at - 14 deg C.

  • A. high
  • B. low
  • C. zero
  • D. medium
Answer: A — high
Vinyl Chloride Monomer has an atmospheric boiling point of -13.8°C (approx. -14°C), allowing it to be transported in semi-pressurized or fully refrigerated gas carriers.

11. Vinyl Chloride has a ____________specific gravity much denser than other common gas.

  • A. 0.67
  • B. 0.87
  • C. 0.57
  • D. 0.97
Answer: D — 0.97
Vinyl Chloride Monomer vapor has a high liquid specific gravity (approx. 0.97 at boiling point) and a heavy vapor density (2.15 times heavier than air).

12. Gas shipping began in which year?

  • A. 1920
  • B. 2000
  • C. 1520
  • D. 2019
Answer: A — 1920

13. In which year fully refrigerated ships for Liquified Petroleum Gas, Liquified Natural Gas and certain chemical gases.

  • A. 2010
  • B. 2019
  • C. 1963
  • D. 1900
Answer: C — 1963
The era of modern fully refrigerated ocean-going LNG and LPG carriers began in the early 1960s with purpose-built insulated containment systems.

14. Absolute pressure is the total of ___________

  • A. pressure of surrounding atmosphere
  • B. gauge pressure
  • C. both (a) and (b)
  • D. none of the above
Answer: C — both (a) and (b)
Absolute pressure is defined as the total pressure exerted on a surface, equal to gauge pressure plus local atmospheric pressure (P_abs = P_gauge + P_atm).

15. In practical calculations for Celcius to Kelvin _____________ is added

  • A. 373
  • B. 473
  • C. 73
  • D. 273
Answer: D — 273
To convert temperatures from the Celsius scale to the absolute thermodynamic Kelvin scale, 273.15 (commonly rounded to 273) is added to the Celsius value.

16. Absolute zero is the temperature at which the volume of gas theoretically becomes _____________

  • A. high
  • B. low
  • C. medium
  • D. zero
Answer: D — zero
Absolute zero (0 Kelvin or -273.15°C) is the theoretical thermodynamic state where molecular kinetic energy reaches its minimum and gas volume theoretically extrapolates to zero.

17. Absolute zero is _____________

  • A. being -473.16 deg C
  • B. being -273.16 deg C
  • C. none of the above
  • D. being -373.16 deg C
Answer: B — being -273.16 deg C
Absolute zero corresponds to exactly -273.15°C (or -273.16°C in early thermometry definitions relative to the triple point of water).

18. Activated Alumina a desiccant medium which operates by adsorption of ___________

  • A. gauge pressure
  • B. water molecules
  • C. pressure of surrounding atmosphere
  • D. gas
Answer: B — water molecules
Activated alumina is a highly porous desiccant adsorbent used in gas carrier dehumidifiers to remove moisture by physical adsorption of water molecules.

19. Adiabatic is an ideal process undergone by a gas in which__________ occurs

  • A. no loss of heat
  • B. no gain of heat
  • C. both (a) and (b)
  • D. none of the above
Answer: C — both (a) and (b)
An adiabatic process is an idealized thermodynamic process in which no heat energy is transferred into or out of the working fluid system (Q = 0).

20. Aerating means the introduction of fresh air into a tank with the object of removing

  • A. toxic
  • B. inert gas
  • C. All of the above
  • D. flamamable
Answer: C — All of the above
Aerating or gas-freeing is the controlled introduction of fresh air into a purged cargo or fuel tank to displace inert gas and restore a safe, breathable atmosphere.

21. Aerating means _____________ the oxygen content by 21 percent by volume.

  • A. decreasing
  • B. increasing
  • C. maintaining
  • D. none of the above
Answer: B — increasing
Aerating tank spaces increases the oxygen content back to normal atmospheric levels (20.9% to 21.0% oxygen by volume) before personnel entry.

22. Air lock is used to maintain _____________ areas at a pressure differential.

  • A. adjacent
  • B. non adjacent
  • C. none of the above
  • D. opposite
Answer: A — adjacent
Air locks maintain a positive overpressure barrier between non-hazardous gas-safe spaces (such as accommodation or control rooms) and adjacent hazardous deck zones.

23. __________ is the lowest temperature to which a liquid or gas requires to be raised to cause self- sustained spontaneous combustion

  • A. Boiling Point
  • B. Absolute Zero
  • C. Auto-Ignition Temperature
  • D. Absolute Temperature
Answer: C — Auto-Ignition Temperature
Auto-ignition temperature (AIT) is the lowest temperature at which a flammable vapor-air mixture will spontaneously ignite without an external spark or flame.

24. BLEVE means

  • A. Boiling Liquid Expanding Vapour Explosion
  • B. Boiling Liquid Exploring Vapour Explosion
  • C. Boil-off Liquid Expanding Vapour Explosion
  • D. Boil-off Liquid Exploring Vapour Explosion
Answer: A — Boiling Liquid Expanding Vapour Explosion
BLEVE stands for Boiling Liquid Expanding Vapor Explosion, a catastrophic structural failure of a pressure vessel containing a superheated liquefied gas.

25. BLEVE is associated with _________of pressure vessel containing liquified gas

  • A. rupture
  • B. under fire conditions
  • C. none of the above
  • D. both (a) and (b)
Answer: C — none of the above
A BLEVE occurs when external heat weakens a pressurized vessel containing liquefied gas, causing catastrophic tank rupture and rapid explosive vaporization.

26. ___________ is the vapour produced above the surface of a boiling cargo due to evaporation.

  • A. BLEVE
  • B. Boiling Point
  • C. Absolute Temperature
  • D. Boil-off
Answer: D — Boil-off
Boil-off gas (BOG) is the continuous vapor generated above the liquid surface inside cryogenic fuel tanks due to unavoidable ambient heat ingress.

27. Boil-Off is caused by

  • A. none of the above
  • B. both (a) and (b)
  • C. heat ingress
  • D. drop in pressure
Answer: B — both (a) and (b)
Boil-off gas formation is primarily caused by heat ingress through tank insulation and changes in atmospheric or tank vapor pressure.

28. Boiling point varies with

  • A. drop in pressure
  • B. discharge pressure
  • C. exerted pressure
  • D. none of the above
Answer: C — exerted pressure
The boiling point of any pure liquid is directly dependent upon the external pressure exerted upon its liquid surface.

29. Boil-Off varies with

  • A. discharge pressure
  • B. high pressure
  • C. exerted pressure
  • D. drop in pressure
Answer: D — drop in pressure
The rate of boil-off vapor generation increases whenever there is a drop in tank pressure or an increase in thermal heat transmission into the cargo.

30. Booster pump used to

  • A. exerted pressure
  • B. increase the discharge pressure from another pump
  • C. high pressure
  • D. drop in pressure
Answer: B — increase the discharge pressure from another pump
Methane boils at -161.5°C at atmospheric pressure and has a molecular weight of 16.04 g/mol, making cold methane vapor lighter than air once warmed above approx. -110°C.

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