Master Brewer Certification Brewer Brewing Equipment & Technology 3 — Questions and Answers
Question 1: What is the role of a pressure relief valve (PRV) on a conditioning or serving tank?
- To inject CO2 to maintain carbonation levels
- To automatically release gas if internal pressure exceeds a safe threshold (Correct answer)
- To measure dissolved CO2 in the beer
- To equalize pressure between two connected tanks
Correct answer: To automatically release gas if internal pressure exceeds a safe threshold
A PRV is a safety device that vents gas when tank pressure exceeds the preset limit, preventing vessel failure or rupture.
Question 2: In a direct-fire brew kettle, what is 'kettle caramelization' and why must a brewer control it?
- The Maillard reaction between amino acids and sugars that produces color and flavor; excessive heat can create off-flavors (Correct answer)
- The precipitation of calcium oxalate that forms a scale on heating surfaces
- The volatilization of hop alpha acids at boiling temperatures
- The conversion of starch to fermentable sugars by residual enzymes
Correct answer: The Maillard reaction between amino acids and sugars that produces color and flavor; excessive heat can create off-flavors
Kettle caramelization involves Maillard and caramelization reactions that develop desirable color and flavor, but excess localized heat causes harsh off-flavors and excessive darkening.
Question 3: A centrifuge is used in a commercial brewery primarily to:
- Filter out hop pellet material before the boil
- Remove yeast and particulates from beer to improve clarity without filtration media (Correct answer)
- Separate water from spent grain after lautering
- Blend beers of different gravities to hit a target ABV
Correct answer: Remove yeast and particulates from beer to improve clarity without filtration media
A centrifuge uses centrifugal force to separate suspended yeast and particles from beer rapidly, reducing filtration load and improving clarity.
Question 4: What does 'dissolved oxygen (DO) pickup' refer to in a packaging line, and why is it critical?
- The amount of O2 intentionally added to promote yeast growth before pitching
- Unintended oxygen absorption into beer during filling, which accelerates staling and shortens shelf life (Correct answer)
- The measurement of O2 levels in the empty can before fill
- The transfer of O2 from CO2 supply lines into conditioning tanks
Correct answer: Unintended oxygen absorption into beer during filling, which accelerates staling and shortens shelf life
DO pickup occurs when beer absorbs oxygen during transfers or filling, promoting oxidation reactions that produce stale cardboard or papery off-flavors.
Question 5: Which heat exchanger design is most common in large commercial breweries for wort cooling?
- Shell-and-tube heat exchanger
- Plate heat exchanger (Correct answer)
- Immersion coil chiller
- Jacketed pipe heat exchanger
Correct answer: Plate heat exchanger
Plate heat exchangers are preferred in commercial breweries for their high efficiency, compact footprint, and ease of cleaning compared to shell-and-tube designs.
Question 6: What is the purpose of glycol jacketing on a fermenter?
- To allow steam injection for in-place sterilization
- To circulate chilled glycol solution for precise temperature control of fermentation (Correct answer)
- To provide insulation against ambient temperature fluctuations
- To allow direct fire heating during cold-temperature fermentations
Correct answer: To circulate chilled glycol solution for precise temperature control of fermentation
Glycol jacketing circulates chilled propylene glycol solution around the vessel to remove fermentation heat and maintain precise temperature control.
Question 7: In brewing, what does a 'bright beer tank' (BBT) primarily serve?
- It is the first vessel where yeast is pitched after the boil
- It is a pressure-rated serving or conditioning vessel that holds clarified, carbonated beer ready for packaging (Correct answer)
- It is an open vessel used for dry hopping additions
- It functions as the whirlpool vessel for separating hot break
Correct answer: It is a pressure-rated serving or conditioning vessel that holds clarified, carbonated beer ready for packaging
A bright beer tank holds finished, clarified, and carbonated beer under pressure prior to packaging, acting as a buffer between production and the packaging line.
Master Brewer Certification Brewer Brewing Equipment & Technology 3
What is the role of a pressure relief valve (PRV) on a conditioning or serving tank?