CFPS Draft Beer Systems and Technology 3

Question 1

What technology does a long-draw draft system use to maintain beer quality when the cooler is far from the bar?

Accepted Answer

Insulated trunk lines with circulating glycol coolant from a remote walk-in cooler

Answer

Very high CO2 pressure to push beer quickly through warm lines

Answer

Multiple kegs connected in series to maintain continuous flow

Answer

Exclusive use of nitrogen to prevent temperature-related carbonation changes

Question 2

What line material is recommended for modern draft beer systems over traditional vinyl tubing?

Accepted Answer

Polyethylene barrier tubing

Answer

Copper tubing

Answer

Standard PVC hose

Answer

Vinyl tubing

Question 3

What is the function of a trunk line in a long-draw draft system?

Accepted Answer

To bundle and insulate beer lines and glycol lines running together from the cooler to the bar

Answer

To carry CO2 from the gas cylinder to the kegs

Answer

To connect multiple pressure regulators to a single gas source

Answer

To regulate individual keg flow rates

Question 4

Which of the following is a sign that draft beer is being dispensed at too low a temperature?

Accepted Answer

Beer appearing cloudy or icy in the glass

Answer

Excessive foaming at the tap

Answer

Flat beer with low perceived carbonation

Answer

Sour or acetic off-flavors in the beer

Question 5

How many gallons does a standard US half-barrel keg hold?

Accepted Answer

15.5 gallons

Answer

5 gallons

Answer

7.75 gallons

Answer

31 gallons

Question 6

Why is nitrogen used in blended-gas draft systems for standard (non-nitro) beers served through long draw lines?

Accepted Answer

Nitrogen provides additional pushing pressure without significantly raising carbonation because it is poorly soluble in beer

Answer

Nitrogen adds carbonation similar to CO2

Answer

Nitrogen is used to sanitize lines between pours

Answer

Nitrogen lowers the serving temperature of the beer

Question 7

According to proper draft service practices, what should be done with a newly delivered keg before tapping it for service?

Accepted Answer

Allow it to rest undisturbed at serving temperature for at least 24 hours before tapping

Answer

Tap it immediately and pour until foam stops, then serve

Answer

Shake it gently to equalize internal pressure before connecting the coupler

Answer

Run CO2 at double normal pressure for 10 minutes to re-carbonate it