Master Brewer Certification Sensory Evaluation & Beer Styles 1 — Questions and Answers
Question 1: What is the primary purpose of a trained sensory panel in a professional brewery?
- To design new label artwork
- To detect off-flavors and ensure consistent product quality before release (Correct answer)
- To set retail pricing strategy
- To audit hop contracts
Correct answer: To detect off-flavors and ensure consistent product quality before release
Sensory panels use trained tasters to identify flavor defects and verify that beer matches its target profile before it reaches consumers.
Question 2: Which off-flavor compound, produced by bacterial contamination or poor yeast health, smells like butter or butterscotch in beer?
- Acetaldehyde
- Diacetyl (Correct answer)
- DMS (dimethyl sulfide)
- Isoamyl acetate
Correct answer: Diacetyl
Diacetyl is a vicinal diketone produced during fermentation that, at elevated levels, imparts an undesirable buttery flavor and aroma.
Question 3: The BJCP (Beer Judge Certification Program) style guidelines are primarily used in the US to:
- Set federal labeling standards
- Define and judge beer styles in amateur and professional competitions (Correct answer)
- Establish minimum alcohol content laws
- Certify hop growers
Correct answer: Define and judge beer styles in amateur and professional competitions
BJCP guidelines provide detailed descriptions of beer style parameters—color, aroma, flavor, bitterness, strength—used by judges at homebrew and professional competitions.
Question 4: In sensory science, what does 'threshold' refer to when discussing flavor compounds in beer?
- The maximum legal limit of alcohol by volume
- The minimum concentration at which a taster can detect a substance (Correct answer)
- The color measurement of a finished beer
- The bitterness unit target for a style
Correct answer: The minimum concentration at which a taster can detect a substance
Flavor threshold is the lowest concentration of a compound that a trained taster can reliably detect, which varies by compound and by individual.
Question 5: Which evaluation method presents tasters with two identical samples and one different sample, asking them to identify the odd one out?
- Duo-trio test
- Triangle test (Correct answer)
- Ranking test
- Descriptive analysis
Correct answer: Triangle test
The triangle test is a discrimination method where three samples (two alike, one different) are evaluated to determine if a perceivable difference exists.
Question 6: What does IBU stand for, and what does it measure in beer?
- International Brewing Units — overall beer quality score
- International Bitterness Units — the concentration of iso-alpha acids contributing bitterness (Correct answer)
- Isobaric Brewing Utilization — fermentation pressure balance
- Integrated Batch Uniformity — batch-to-batch consistency
Correct answer: International Bitterness Units — the concentration of iso-alpha acids contributing bitterness
IBU measures milligrams of iso-alpha acids per liter of beer, providing a standardized scale for perceived bitterness.
Master Brewer Certification Sensory Evaluation & Beer Styles 1
What is the primary purpose of a trained sensory panel in a professional brewery?