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Which gaseous fuel is largely methane?

  • A.Compressed natural gas
  • B.Liquefied petroleum gas, which is a mixture of propane and butane recovered during the refining of crude oil
  • C.Hydrogen
  • D.Natural gas, whose principal constituent is methane and which is stored on the vehicle at a high pressure

Answer: A

Natural gas is mostly methane and is stored at around two hundred bar. The last option explains exactly that, which makes it a correct and more detailed version. Liquefied petroleum gas is a different mixture. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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