Which three fuels are used to power a generator? (Choose three.)

Question

Options

• AGlycol
• BDiesel
• CGasoline
• DMethanol
• ENatural gas

• A
  3% (1)
• B
  84% (27)
• C
  9% (3)
• D
  3% (1)

Explanation

Generators are commonly powered by diesel (B), gasoline (C), and natural gas (E) - these three are the standard fuel sources you will encounter on exams and in real-world equipment. Glycol (A) is a coolant and antifreeze fluid used in cooling systems, not a combustion fuel, so it cannot power a generator engine. Methanol (D) is a type of alcohol that can serve as a fuel in specialized applications like racing or fuel cells, but it is not a standard generator fuel and is typically excluded from this category in certification exams.

Memory tip: Think of the three fuels as covering the main delivery types - a liquid stored on-site (diesel), a liquid from a pump (gasoline), and a piped-in gas (natural gas). If you can picture how fuel is delivered to a generator, you can eliminate glycol (it goes in the radiator, not the tank) and methanol (too specialized).

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