Master Brewer Certification Brewer Brewing Equipment & Technology 5

Question 1

What is the purpose of 'underletting' in a mash or lauter tun?

Accepted Answer

Adding cold water below the grain bed to lift and float the bed for vorlauf or to assist lautering

Answer

Injecting CO2 beneath the mash to strip dissolved oxygen

Answer

Pumping wort back through the bottom plates to recirculate the mash

Answer

Introducing sparge water above the grain bed for rinsing

Question 2

In high-gravity brewing with dilution, a brewery uses a 'de-aeration' system on its dilution water. Why?

Accepted Answer

To remove dissolved oxygen from dilution water before it contacts beer, preventing oxidation

Answer

To raise the pH of dilution water to match target wort pH

Answer

To chill dilution water to fermentation temperature before blending

Answer

To strip chloramine from municipal water before it enters the system

Question 3

What is 'thermal mass' in a brew kettle context, and how does it influence the brewing process?

Accepted Answer

The amount of heat energy stored in the kettle material and wort, affecting how quickly the system responds to heating or cooling inputs

Answer

The weight of the kettle vessel when full of wort, which determines forklift capacity needed

Answer

The surface area of the kettle's heating element in contact with wort

Answer

The insulation rating of the kettle jacket measured in BTUs per hour

Question 4

A compressed air-driven diaphragm pump is sometimes used in breweries for which specific application?

Accepted Answer

Transferring viscous or shear-sensitive materials like yeast slurry without damaging cells

Answer

Wort transfer from kettle to fermenter at high flow rates

Answer

Pressurizing CO2 headers for carbonation

Answer

Recirculating glycol through fermentation jackets

Question 5

What does 'Total Dissolved Solids' (TDS) measured in brewing water indicate, and why does it matter for equipment?

Accepted Answer

The concentration of dissolved minerals and salts, which affects scale buildup in heat exchangers and can impact flavor

Answer

The amount of hop-derived bittering compounds in the water supply

Answer

The level of dissolved CO2 available for carbonation without supplemental gas

Answer

The turbidity of water entering the mash, which predicts filtration load

Question 6

What is the function of a 'vorlauf' step during lautering, and which piece of equipment performs it?

Accepted Answer

Recirculating the first cloudy wort back over the grain bed until it runs clear, using the lauter tun's underlet or recirculation line

Answer

Sparging with hot water to rinse residual sugars from the grain; performed by the sparge arm

Answer

Measuring wort specific gravity at the start of runoff using an inline refractometer

Answer

Cooling the first wort to prevent enzyme activity from continuing; performed by the wort chiller

Question 7

When specifying a steam-heated brew kettle, what does 'steam pressure' determine about the system's heating capacity?

Accepted Answer

Higher steam pressure increases the temperature of the steam, raising the heat flux delivered to wort through the jacket

Answer

Higher steam pressure lowers the boiling point of wort, reducing energy needed to maintain a boil

Answer

Steam pressure controls the rate at which condensate drains from the jacket, not the temperature

Answer

Lower steam pressure is preferred because it produces drier steam that transfers heat more efficiently