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LGTCO/LGTF exit exam questions and answers — Set 6

Set 6 of the Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF) exit exam bank — 9 of 159 questions, with the correct option marked and a one-line explanation for every one. 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 6 — 9 LGTCO/LGTF exit exam questions with answers

1. Running two identical centrifugal cargo pumps in parallel will result in:

  • A. Almost double the discharge pressure with the same discharge rate
  • B. Almost double the discharge flow rate with discharge pressure largely unchanged
  • C. Double discharge rate and double discharge pressure simultaneously
  • D. The exact same discharge pressure and rate as running one pump
Answer: B — Almost double the discharge flow rate with discharge pressure largely unchanged
Operating centrifugal pumps in parallel increases the total volumetric discharge flow rate (nearly double, depending on system backpressure) while the total discharge head/pressure remains approximately constant.

2. Whether cargo tanks are of Type 'A', 'B' or 'C', a complete double hull is required for carriage of liquefied gas cargoes below what temperature?

  • A. -88°C
  • B. -55°C
  • C. -104°C
  • D. -162°C
Answer: B — -55°C
Under the IGC Code, a complete double hull and double bottom structure surrounding the cargo hold spaces is mandatory for vessels carrying liquefied gases at carriage temperatures below -55°C.

3. What is the minimum water application rate of the fixed water spray system for fire protection purposes on horizontal deck surfaces?

  • A. 10 litres/m² per minute
  • B. 4 litres/m² per minute
  • C. 20 litres/m² per minute
  • D. 15 litres/m² per minute
Answer: A — 10 litres/m² per minute
The IGC Code Chapter 11 requires deck fixed water spray systems to deliver a minimum uniform application rate of 10 litres/m² per minute over horizontal surfaces.

4. What is the minimum water application rate of the fixed water spray system for fire protection purposes on vertical surfaces?

  • A. 8 litres/m² per minute
  • B. 4 litres/m² per minute
  • C. 12 litres/m² per minute
  • D. 15 litres/m² per minute
Answer: B — 4 litres/m² per minute
The IGC Code specifies a minimum water spray delivery rate of 4 litres/m² per minute for vertical surfaces, accommodation bulkheads, and tank domes.

5. In fixed gas-detection systems on board gas carriers, the Gas Codes mandate that sampling intervals from any one space must not exceed:

  • A. 60 minutes
  • B. 30 minutes
  • C. 45 minutes
  • D. 20 minutes
Answer: B — 30 minutes
Where sequential gas sampling systems are used on gas carriers, the interval between consecutive samplings from any individual monitored location must not exceed 30 minutes.

6. What is the name of the statutory certificate issued by a Flag Administration confirming that a gas carrier complies with the IGC/GC Gas Code?

  • A. Certificate of Construction
  • B. Load Line Certificate
  • C. Safety Construction Certificate
  • D. International Certificate of Fitness for the Carriage of Liquefied Gases in Bulk
Answer: D — International Certificate of Fitness for the Carriage of Liquefied Gases in Bulk
The statutory document certifying full compliance with the International Gas Carrier Code regarding structure, containment, safety systems, and piping is the International Certificate of Fitness for the Carriage of Liquefied Gases in Bulk (COF).

7. Which space is defined as the space enclosed by the ship's structure in which a cargo containment system is situated?

  • A. Interbarrier space
  • B. Hold space
  • C. Void space
  • D. Cofferdam
Answer: B — Hold space
Under the IGC Code, a 'Hold Space' is the enclosed space bounded by the ship's primary hull structure within which a cargo containment system is located.

8. Which petroleum gases does commercial LPG mainly consist of?

  • A. Ethane & Pentane
  • B. Butadiene & Ammonia
  • C. Chlorine & Ethylene
  • D. Propane & Butane
Answer: D — Propane & Butane
Liquefied Petroleum Gas (LPG) consists predominantly of propane (C3H8), butane (C4H10), or mixtures of both hydrocarbons.

9. What is the primary purpose of inerting on a liquefied gas carrier?

  • A. To prevent flammable vapour/air mixtures in cargo tanks and associated piping
  • B. To increase oxygen content in vapour/air mixtures in tanks
  • C. To increase hydrocarbon concentration in vapour/air mixtures
  • D. To pressurize cargo tanks for deepwell pump suction
Answer: A — To prevent flammable vapour/air mixtures in cargo tanks and associated piping
The primary objective of inerting is to displace oxygen or flammable gas with an inert medium (such as nitrogen or flue gas) to ensure that the atmosphere in tanks and piping remains non-flammable at all times.

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