Canadian Entry To Practice (CETP) Practice Test

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HD-5 propane is frequently used as a motor fuel due to the maximum level of propylene being limited to what percentage?

  1. 2%

  2. 5%

  3. 10%

  4. 15%

The correct answer is: 5%

The maximum level of propylene in HD-5 propane is limited to 5% because this specification is designed to ensure that the fuel maintains optimal performance and safety standards for use in motor vehicles. Propylene, while a useful compound in many applications, can alter combustion characteristics if present in higher concentrations. By restricting propylene to 5%, HD-5 propane ensures that engines operate efficiently and reduces the likelihood of engine knocking or other performance issues that could arise with higher levels of propylene. This limitation also helps in maintaining compliance with environmental regulations, as excessive propylene could contribute to increased emissions.

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