Brewing fermentation and packaging

Question 1

What yeast is used for ales?

Answer 1

Saccharomyces cerevisiae

Question 2

What yeast is used for larger?

Answer 2

Saccharomyces pastorianus

Question 3

What do yeast need to grow?

Answer 3

Wort

Question 4

When is yeast added?

Answer 4

To wort when it has been cooled and oxygenated

Question 5

How does fermentation effect viscosity?

Answer 5

Decrease

Question 6

Why does fermentation decrease viscosity?

Answer 6

Conversion of sugar to alcohol

Question 7

What does fermentation produce?

Answer 7

Ethanol
CO2
Aldehydes
Esters
Organic acids

Question 8

How is fermentation ended?

Answer 8

Yeast is cropped and stored
Diluted if alcohol is too high

Question 9

What helps wort to spoil?

Answer 9

Sugar
Amino acids
Oxygen
pH

Question 10

How is beer spoilage reduced?

Answer 10

Low carbohydrate level
Lower pH
High ethanol and CO2
Low oxygen

Question 11

How are cask or bottle beers different to brewery beers?

Answer 11

Cask or bottle are not filtered and packaged with fermentable sugars to carry on fermentation

Question 12

What is rapid conditioning?

Answer 12

All yeast steps occur in primary fermentation
No low temperature needed
Stabilisation aids can be added to promote haze

Question 13

What is filtration?

Answer 13

Removal of particles down to 0.5 microns

Question 14

What is beer preserved from?

Answer 14

Oxygen, UV

Question 15

Steps of beer bottling

Answer 15

Bottle washing
Filling and capping
Pasteurisation
Packaging

Question 16

How are kegs packaged?

Answer 16

Valve is sealed shut by spring which is depressed by gas to release beer