Cicerone Certified Beer Server Practice Exam 2026 – All-in-One Resource to Pass with Confidence!

Question: 1 / 400

Which of the following is a common fault in beer resulting from poor sanitation?

Oxidation

Skunky flavor

Diacetyl

The common fault in beer that is closely associated with poor sanitation is diacetyl. Diacetyl is a compound that can produce a buttery flavor in beer, which is often perceived as a defect. This compound is typically produced by yeast during fermentation, especially when the yeast is stressed or when fermentation conditions are not optimal. Poor sanitation can lead to the introduction of unwanted microorganisms that can produce diacetyl, especially if infected with specific bacteria or wild yeast strains.

In well-sanitized environments, yeast can properly carry out fermentation without the influence of these contaminants, thereby minimizing the risk of diacetyl production and other off-flavors. Maintaining sanitary practices throughout the brewing process, from equipment to ingredient handling, is crucial to avoid such faults.

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Acidity

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