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BIGF exit exam questions and answers — Set 1

Set 1 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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30 of 30 shown · Set 1

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Set 1 — 30 BIGF exit exam questions with answers

1. IMO means ____________

  • A. International Main Oraganisation
  • B. Indian Marine Organisation
  • C. International Maritime Oraganisation
  • D. Indian Maritime Organisation
Answer: C — International Maritime Oraganisation
IMO stands for International Maritime Organization, the specialized agency of the United Nations responsible for regulating shipping safety, maritime security, and marine environmental protection.

2. A liquefied gas is the liquid form of a substance, which at _________________would be a gas.

  • A. both (a) and (b)
  • B. ambient temperature
  • C. none of the above
  • D. atmospheric pressure
Answer: A — both (a) and (b)
A liquefied gas is defined by the Gas Codes as the liquid form of a substance which, at ambient temperature and atmospheric pressure, would exist in a gaseous state.

3. The most important property of a liquified gas, in relation to pumping and storage is _____________

  • A. none of the above
  • B. low vapour pressure
  • C. high vapour pressure
  • D. saturated vapour pressure
Answer: D — saturated vapour pressure
Saturated Vapor Pressure (SVP) is the most critical physical property of a liquefied gas regarding pumping, storage, and tank pressure management.

4. Saturated vapour pressure is the ___________ pressure exerted when liquid is in equlibrium with its own vapour at a given temperature.

  • A. flexible
  • B. partial
  • C. relative
  • D. absolute
Answer: D — absolute
Saturated vapor pressure is the absolute pressure exerted by a vapor in thermodynamic equilibrium with its liquid phase at a given temperature in a closed system.

5. The most important property of a liquified gas, in relation to ___________ is saturated vapour pressure

  • A. storage
  • B. both (a) and (b)
  • C. pumping
  • D. none of the above
Answer: B — both (a) and (b)
Saturated vapor pressure directly governs both cargo pumping cavitation limits and fuel tank pressure containment requirements for liquefied gases.

6. Saturated vapour pressure is the absolute pressure exerted when _______ is in equlibrium with its own vapour at a given temperature.

  • A. vapour
  • B. liquid
  • C. solid
  • D. gas
Answer: B — liquid
Saturated vapor pressure is the absolute equilibrium pressure exerted by the evaporated vapor above the liquid surface at a specified temperature.

7. Saturated vapour pressure is the absolute pressure exerted when liquid is in ___________ with its own vapour at a given temperature.

  • A. none of the above
  • B. equlibrium
  • C. stability
  • D. tranquility
Answer: B — equlibrium
Thermodynamic equilibrium occurs when the rate of liquid evaporation equals the rate of vapor condensation at a constant temperature and pressure.

8. Liquid with a vapour pressure exceeding ________absolute at a temperature of 37.8 deg C.

  • A. 2.0 bar
  • B. 2.9 bar
  • C. 2.5 bar
  • D. 2.8 bar
Answer: D — 2.8 bar
Under the IMO IGC and IGF Codes, a liquefied gas is defined as a liquid having a saturated vapor pressure exceeding 2.8 bar absolute at a temperature of 37.8°C.

9. Liquid with a vapour pressure exceeding 2.8 bar absolute at a temperature of __________.

  • A. 38.8 deg C
  • B. 37.8 deg C
  • C. 36.8 deg C
  • D. 37.0 deg C
Answer: B — 37.8 deg C
The standard reference temperature defined in the IMO Gas Codes for classifying liquefied gases by vapor pressure (exceeding 2.8 bar absolute) is 37.8°C (100°F).

10. What are the cargoes carried on Liquified Gas Tankers?

  • A. Liquified Petroleum Gas
  • B. none of the above
  • C. Liquified Natural Gas
  • D. both (a) and (b)
Answer: D — both (a) and (b)

11. ____________ is transported either by pipeline as a gas or by sea in its liquified form as Liquified Natural Gas.

  • A. Natural gas
  • B. Ethane gas
  • C. Chemical gases
  • D. none of the above
Answer: A — Natural gas
Natural gas is transported either overland via pressurized pipeline grids or across oceans by specialized gas carriers in liquefied form as Liquefied Natural Gas (LNG).

12. Natural gas comes from ________________

  • A. heating mixtures
  • B. rocks
  • C. cold climate
  • D. underground deposits
Answer: D — underground deposits
Natural gas is a naturally occurring fossil fuel extracted from underground geological hydrocarbon reservoirs and gas fields.

13. In natural gas what is the range of methane ?

  • A. 50%
  • B. 70 to 99 %
  • C. 100%
  • D. 60 to 88%
Answer: B — 70 to 99 %
Methane (CH4) is the predominant component of raw and commercial natural gas, typically comprising 70% to 99% of the total gas volume.

14. Which is the major constituent of natural gas?

  • A. oxygen
  • B. ethane
  • C. methane
  • D. octane
Answer: C — methane
Methane is the lightest and primary constituent of natural gas, typically making up between 85% and 95%+ of Liquefied Natural Gas.

15. Methane is a petrochemical stock leading to the production of _________

  • A. acetic acid
  • B. acetaldehyde
  • C. methonal
  • D. ethanol
Answer: C — methonal
Methane is an essential petrochemical feedstock used in chemical synthesis plants for the commercial production of methanol and ammonia.

16. ____________ is a petrochemical stock leading to the production of methonal

  • A. Octane
  • B. Methane
  • C. Acetic acid
  • D. Ethane
Answer: B — Methane
Methane is reacted with steam (steam reforming) to produce synthesis gas, which is the primary feedstock for manufacturing methanol.

17. Methanol is a feedstock to ___________

  • A. both (a) and (b)
  • B. none of the above
  • C. Methyl tetra chloride
  • D. Formaldehyde
Answer: A — both (a) and (b)
Methanol is a versatile petrochemical intermediate widely used in the production of formaldehyde, acetic acid, solvents, and alternative marine fuels.

18. Associated gas found in combination with __________ comprises mainly methane and Natural Gas Liquids

  • A. gas
  • B. crude oil
  • C. diesel
  • D. petroluem
Answer: B — crude oil
Associated gas is natural gas found in reservoir contact with crude oil, containing methane along with heavier Natural Gas Liquids (NGLs).

19. Associated gas found in combination with crude oil comprises mainly ______________

  • A. none of the above
  • B. methane
  • C. both (a) and (b)
  • D. Natural Gas Liquids
Answer: C — both (a) and (b)
Associated petroleum gas consists of a mixture of methane and heavier fractions known as Natural Gas Liquids (ethane, propane, butane, pentane).

20. Natural Gas Liquids are made up of __________

  • A. Liquified Petroleum Gas
  • B. none of the above
  • C. ethane
  • D. both (a) and (b)
Answer: D — both (a) and (b)
Natural Gas Liquids (NGL) comprise the heavier hydrocarbon fractions of natural gas, primarily ethane, propane, butane, isobutane, and natural gasoline.

21. Natural Gas Liquids are carried at- _________ at atmospheric pressure

  • A. 37oC
  • B. 35oC
  • C. 36oC
  • D. 80oC
Answer: D — 80oC
Heavier Natural Gas Liquid fractions can be refrigerated and carried as liquids at temperatures down to -80°C at atmospheric pressure.

22. Natural Gas Liquids are carried at- _________ at atmospheric vapour pressure of 5 bar

  • A. 135degc
  • B. 400degC
  • C. 45degc
  • D. 550degc
Answer: C — 45degc
Semi-pressurized carriage allows certain liquefied gas fractions to be transported at temperatures around -45°C under a vapor pressure of approximately 5 bar.

23. Natural Gas Liquids are carried at -45deg C at vapour pressure of __________

  • A. 15 bar
  • B. 7 bar
  • C. 5 bar
  • D. 25 bar
Answer: C — 5 bar
Carriage of liquefied petroleum gases in semi-refrigerated tanks is commonly maintained at -45°C with a designed working vapor pressure of about 5 bar.

24. Liquified Petroleum Gas is a comprise of ________________

  • A. propane
  • B. none of the above
  • C. butane
  • D. both (a) and (b)
Answer: D — both (a) and (b)
Liquefied Petroleum Gas (LPG) consists primarily of propane (C3H8), butane (C4H10), or commercial mixtures of both hydrocarbons.

25. What is the use of bottled gas?

  • A. none of the above
  • B. both (a) and (b)
  • C. cooking in remote loctions
  • D. fuel for heating
Answer: B — both (a) and (b)
Commercial bottled gas (LPG cylinders) is widely utilized for domestic heating, commercial cooking, automotive fuel (autogas), and industrial cutting.

26. Which is an important octane enhancer for motor gasoline?

  • A. kerosene
  • B. crude oil
  • C. water
  • D. butane
Answer: D — butane
Commercial butane and isobutane are critical blending agents and octane enhancers utilized in the refining of motor gasoline.

27. Which is used as bottled gas in cold climates?

  • A. ammonia
  • B. both (a) and (b)
  • C. propane
  • D. none of the above
Answer: C — propane
Propane has a lower boiling point (-42°C) than butane (-0.5°C), allowing it to vaporize easily and serve as bottled gas in cold climates.

28. Liquified Petroleum Gas is mainly used in ________

  • A. power generation
  • B. All of the above
  • C. petrochemical feedstock
  • D. metal cutting
Answer: B — All of the above
LPG is utilized globally as domestic cooking fuel, industrial heating fuel, automotive autogas, and as petrochemical cracker feed.

29. Used as Petrochemical feedstock for the production of ________

  • A. both (a) and (b)
  • B. none of the above
  • C. acetic acid
  • D. acetaldehyde
Answer: A — both (a) and (b)
LPG fractions (propane and butane) are vital petrochemical feedstocks for steam cracking into olefins like ethylene and propylene.

30. ____________ accounts the large for the third largest sea borne trade in liquified gases after Liquified Natural Gas and Liquified Petroleum Gas

  • A. Urea
  • B. Ammonia
  • C. both (a) and (b)
  • D. none of the above
Answer: B — Ammonia
Anhydrous ammonia (NH3) represents the third largest seaborne trade volume among liquefied gases, following LNG and LPG, primarily used for agricultural fertilizers.

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