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Question 1
Methane’s vapor density relative to air is 0.55, indicating it is lighter than air. What does this imply about its buoyancy compared with air?
Correct Answer:
It is lighter than air
Explanation:
Buoyancy depends on density relative to the surrounding air. If a gas is lighter than air, it displaces air that weighs more than the gas itself, producing a net upward force. Methane having a density of 0.55 times that of air means it is lighter than air, so it experiences positive buoyancy and rises. It will generally move upward and disperse, rather than sinking or staying at the same level. The other ideas don’t fit because a heavier-than-air gas would sink, a gas with the same density would be neutrally buoyant, and gases do mix with air rather than staying completely separate.
Question 2
If the flammable range for LNG is above 15% range, what does this mean?
Correct Answer:
Too rich to burn
Explanation:
The concept here is the flammable range, which is the range of vapor concentrations in air that can sustain combustion. For LNG (primarily methane), that range is roughly from 5% to 15% by volume in air. If the concentration is above the upper limit—about 15%—the mixture is too rich to burn because there isn’t enough oxygen to support the flame. So, a vapor cloud with LNG concentration higher than 15% won’t ignite or sustain combustion. The other options describe concentrations outside the range differently (too lean would be below the lower limit; being able to burn at any concentration isn’t true; non-flammable is too vague).
Question 3
What are mutagens?
Correct Answer:
Effects genetic cells both egg and sperm
Explanation:
Mutagens are agents that cause changes in DNA, producing mutations. They can affect many cell types, but mutations in germ cells—the eggs and the sperm—are the ones that can be passed to offspring. That’s why describing mutagens as affecting genetic cells in eggs and sperm best captures their potential to create heritable changes. The other statements are incomplete: mutagens are not limited to somatic cells, nor to plant cells, and while they can influence viral DNA in some contexts, their defining idea is DNA mutations in any organism, especially germ cells that can be inherited.
Question 4
What is the specific gravity of LNG?
Correct Answer:
0.45
Explanation:
Specific gravity tells you how heavy LNG is compared with water. LNG is kept cryogenically cold and mainly consists of methane, giving it a density around 450 kg per cubic meter. With water at about 1000 kg per cubic meter, the LNG specific gravity is roughly 0.45. Because it’s less dense than water, LNG would float on a water surface as a liquid, which influences how it behaves in spills and how cargo tanks affect buoyancy during loading and unloading. The exact value can vary with the gas blend and temperature, but 0.45–0.50 is a typical range used in practice; exams often use 0.45 as the standard figure. Values like 0.60 would be much denser than LNG usually is, and 0.30 would be too light for this liquid.
Question 5
Which term is used to measure heat energy in English units?
Correct Answer:
BTU (British Thermal Unit)
Explanation:
In LNG practice, measuring heat energy in English units uses the British Thermal Unit. A BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. It’s the standard energy unit in the English engineering system for fuels and heating calculations, which is why it’s the appropriate choice here. Watt reflects power (rate of energy transfer), not total energy. Joule is an SI unit of energy, not an English unit. Calorie is also an energy unit but is mainly used in nutrition and some scientific contexts, not the typical English engineering standard for fuel energy content.
Question 1
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About this Exam

Prepare with the Tanker Familiarization Liquefied Natural Gas (LNG) Practice Exam practice quiz. This question bank includes 10 questions covering range, methane, vapor, tanker, and familiarization. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Tanker Familiarization Liquefied Natural Gas (LNG) Practice Exam

This practice set contains 10 questions from the matching question bank and focuses on range, methane, vapor, tanker, and familiarization. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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