LQ4 Old Test

Question 1

What is the byproduct of biodiesel

Answer 1

Glycerin

Question 2

What is transesterification?

Answer 2

Exchanging the organic alkyl group of an ester with the organic group alkyl of an alcohol

Question 3

What is the primary feedstock for production of biodiesel in the Philippines?

Answer 3

Coconut oil

Question 4

What is the other name for biodiesel?

Answer 4

Methyl ester

Question 5

It cannot be used as feedstock in biodiesel production

Answer 5

Wool

Question 6

What is the common catalyst used in biodiesel production?

Answer 6

Base catalyst

Question 7

What is the statement regarding the alcohol as feed in biodiesel production?

Answer 7

Higher alcohols such as propanol and butanol results in less efficient esterification reaction

Question 8

What is glycerolysis?

Answer 8

Esterification of glycerine with free fatty acids

Question 9

What happens to biodiesel at cold temperatures?

Answer 9

Gels

Question 10

What is the sequence in trans esterification reaction?

Answer 10

Methyl ethanoate + ethanol = ethyl ethanoate + methanol

Question 11

In the production of biodiesel, what causes the formation of soap instead of biodiesel?

Answer 11

Presence of water in feed

Question 12

What happen in transesterification reaction?

Answer 12

It is a reversible reaction

Question 13

What is the typical time and temperature of sterilization using steam?

Answer 13

15 minutes, 121 degrees celsius

Question 14

In fish canning, fish head and tails are removed at vacuum using a ____ machine

Answer 14

Nobbing machine

Question 15

Pasteurization or pasteurization is a process in which packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to?

Answer 15

Less than 100 degree celsius

Question 16

It can prolong the shelf life of food products

Answer 16

Aluminum

Question 17

Preservatives are chemical substances that are added to the food to

Answer 17

Help prevent spoiling, maintain the food’s nutritional quality, and improve appearance

Question 18

In fish canning, the grading machine is used to

Answer 18

Sort fish according to size

Question 19

The process of pasteurization was discovered by

Answer 19

Sir Louis Pasteur

Question 20

Which of the following is not a food preservative?

Answer 20

Sodium bicarbonate

Question 21

Canned foods are sometimes spoiled despite efforts to eliminate spoilage during canning. This could be due to

Answer 21

1. Spoilage before canning
2. Leakage of contaminated water through the can seams during cooling
3. Under-processing during canning

Question 22

A food product that bears the label “Best Before” indicates that

Answer 22

The food product is stable at ambient temperature

Question 23

Sterilizing food can extend its shelf life up to ___ months more even without cold storage

Answer 23

4

Question 24

What makes fermentation a possible technique to prolong the shelf life of food?

Answer 24

Formation of alcohols and acids which are natural preservatives

Question 25

Sardines are pre-cooked in cans at 85 degrees celsius for 12 minutes to

Answer 25

1. Prevent fluid from the fish to leave 2. Maintain quality and flavor of finished product 3. Partially dehydrate the fish

Question 26

Concentration of cane juice is done in two-stages of evaporators. What is the heating medium used in the second evaporator?

Answer 26

Water evaporated from the first evaporator

Question 27

How is clarification done in raw sugar production?

Answer 27

Heat and lime

Question 28

In sugar production, seeding is done in the crystallization process. What is the seed used?

Answer 28

Low grade cane sugar with syrup

Question 29

It is the process of separating the soluble non-sugar materials from sugar cane juice

Answer 29

Carbonation

Question 30

Which part of the process in sugar production is prone to bacterial attack and thus affect the quality of the product?

Answer 30

Extraction

Question 31

What is a massecuite in sugar production?

Answer 31

Mixture of sugar crystals and mother liquor

Question 32

The moister content of dried sugar crystals is about

Answer 32

0.02%

Question 33

Which country is the top producer of sugar cane?

Answer 33

Brazil

Question 34

What is the proper sequence of steps used to prepare sugarcane for extraction?

Answer 34

Crushed, shred, sliced, soaked in hot water

Question 35

What are used to crystallize sugar?

Answer 35

Vacuum pans

Question 36

Which of the following is considered dairy sugar?

Answer 36

Lactose

Question 37

These are small chips or slices of beets in sugar making

Answer 37

Cossette

Question 38

Which of the following is not a product of fermentation? A. Carbon dioxide B. Oxygen C. Lactic acid D. Alcohol

Answer 38

Oxygen

Question 39

It is the product of a lactic acid fermentation

Answer 39

Yogurt

Question 40

It is the microorganisms that is used in ethanol fermentation

Answer 40

Saccharomyces cerevisiae

Question 41

In the production of beer, which of the following processes encourage grain germination?

Answer 41

Malting

Question 42

Where does fermentation take place in the cell?

Answer 42

Cytoplasm

Question 43

Under what condition does yeast produce ethanol

Answer 43

Acidic, 30-40 degrees celsius

Question 44

Alcoholic fermentation takes place in

Answer 44

Fungi and bacteria

Question 45

What is the effect over fermentation in the production of yogurt?

Answer 45

Very sour taste

Question 46

At what concentration does ethanol exhibit product inhibition?

Answer 46

Greater than 18% (v/v)

Question 47

It contribute to the aroma and bitterness of beer

Answer 47

Hops

Question 48

The process of fermentation is

Answer 48

Anaerobic

Question 49

At what temperature does the azeotrope of ethanol and water boil, and what is the concentration of ethanol at this condition?

Answer 49

78.4 degrees celsius, close to 96%

Question 50

In fermentation, what is formed when NADH is reduced to pyruvate?

Answer 50

Lactic acid

Question 51

What are the mechanical separation process for animal fats?

Answer 51

Settling, grinding, and cetrifugation

Question 52

Rudolf diesel uses ___ oil in its diesel engine. This oil is regarded as the first “biofuel” used for engines

Answer 52

Peanut oil

Question 53

Majority of the vegetable oils globally comes from

Answer 53

Palm oil

Question 54

The recovery of fats through cooking that uses water in the process is called

Answer 54

Wet rendering