2nd midterm

Question 1

cold bottles entering tunnel pasteurizier is used to cool the

Answer 1

water that is used to cool the bottles at the discharge end

Question 2

flash pasteurizer is heated to

Answer 2

70 C for a very short amount of time

Question 3

cooling section of a flash pasteurizer

Answer 3

has no impact on the heat up section of the in-coming beer

Question 3

cooling section of a flash pasteurizer

Answer 3

has no impact on the heat up section of the in-coming beer

Question 4

hollow fibre hydrophobic membranes both

Answer 4

add and removes gasses from beer

Question 5

total pressure equals the sum of partial pressure of individual components.

Answer 5

Daltons Law

Question 6

At a constant temperature(for a given mass of gas) volume is inversely proportional to pressure.

Answer 6

Boyle’s Law

Question 7

Nitrogen is 120x

Answer 7

less soluable than CO2

Question 8

solution for long draft lines are

Answer 8

Installation of beer pump
Mixed gas of nitrogen and CO2

Question 9

balanced draft system is when

Answer 9

resistance to the flow from keg to tap is appox equal

Question 10

Properly adjusted system should pour at

Answer 10

1 gal/ min

Question 11

In a flash pasteurizer as much as ____% of the heat content is recovered

Answer 11

94-95%

Question 12

The last heating zone in a tunnel pasteurizer before the holding section is

Answer 12

Superheat Zone

Question 13

Henry’s Law P=H*X

Answer 13

p=pressure of gas
h=henry;’s constant for a given gas
x=molar fraction of gas

Question 14

Henry’s law defines in which a gas distributes itself between the gas phase and the solution phase

Answer 14

true

Question 15

At a constant pressure (for a gven mass of a gas) the volume of gas is directly proportional to the temperature.

Answer 15

Gay-Lussac’s Law

Question 16

Nitrogen is significantly

Answer 16

less dense than CO2

Question 17

The purpose of a choker line is

Answer 17

to equal the gas pressure and distance to make pouring a beer easy/ without foam

Question 18

properly adjusted draft system should take ____sec to fill a 1.89L growler

Answer 18

30 seconds

Question 19

Peak production temperature achieved in a tunnel pasteurizer is

Answer 19

around 60 C

Question 20

failure pressure for tunnel pasteurizer with small packages

Answer 20

non return bottle=10 bar
Cans= 6 bars
Returnable bottle=12 bar

Question 21

P x V = n x R x T

Answer 21

Combined gas law

Question 22

Decimal reduction time(D) is the time needed at a given temperature to

Answer 22

inactivate 90 % of the viable microbrail population

Question 23

why things can’t grow in beer

Answer 23

anaerobic environment

Question 24

beer spoilage orangisms are

Answer 24

not pathogenic

Question 25

rank the pressure drop in common beer lines from low to high

Answer 25

1=Barrier tubing
2=polyethylene
3=polypropylene(vinyl)

Question 26

two main componets to tunnel pasteurizers

Answer 26

• water spray and circulation systems
• package transport

Question 27

cold spot in a bottle and can is

Answer 27

the centre bottom quarter

Question 28

two transfer systems for tunnel p

Answer 28

• walking beams(used in the past)= lift move forward and down. less common due to the containers stability to stay upright
• continuous belt= plastic polypropylene conveyor, more precise control

Question 29

pasteurizer prone to

Answer 29

corrosion and slime growth

Question 30

advantages of tunnel pasteurizer

Answer 30

most reliable and efficient, minimal effecot on product, no risk of reinfection

Question 31

adverse effect of flavour
high internal pressure
high operating cost(energy and water)
high capital and installation
large floor area

Answer 31

Disadvantage to tunnel pasteurizer

Question 32

flash P= bread like flavour can develop when

Answer 32

high temperature occurs

Question 33

Design of Flash P

Answer 33

Heat regeneration
heating
holding cell
final cooling

Question 34

Plate failure can occur and you must protect…

Answer 34

pasteurizer from un pasteurized, use of pump to increase pressure on the pasteurized side is possible (0.5 bar higher min)

Question 35

typical range to keep gas in solution is

Answer 35

1-1.5 bar

Question 36

Wetting pressure is

Answer 36

2-8psi

Question 37

BBT for nitro beer require at least

Answer 37

2 bar or 30 psi

Question 38

beer must be stored and served at the

Answer 38

right temp and idela gas pressure to provide correct carb level