MILLING

Question 1

What is the role of aspirators?

Answer 1

To remove husks

Aspirators are commonly used in grain processing to separate unwanted materials.

Question 2

What is the mass stored in the chamber after five seconds if the feed rates are 500 kg/sec and 600 kg/sec, and the output stream rate is 800 kg/s?

Answer 2

300 kg

Mass stored = (500 + 600 - 800) * 5 = 300 kg.

Question 3

What is the output rate in kg/hr if the feed rates are 4000 kg/hr and 6000 kg/hr with 2000 kg accumulated material?

Answer 3

9000

Output rate = feed rates - accumulated material.

Question 4

What makes a multi-pass rice mill distinct from a single-pass rice mill?

Answer 4

Whitener

Multi-pass rice mills often include additional components for better processing.

Question 5

What type of rice is palay from which only the hull has been removed?

Answer 5

Brown rice

Brown rice retains the bran layer after milling.

Question 6

What is the outer covering of the corn kernel removed during the milling process?

Answer 6

Pericarp

The pericarp is the protective outer layer of the corn kernel.

Question 7

These are corn grits with particle size from 0.842 mm to 1.00 mm.

Answer 7

Corn grits no. 14

Sizes of corn grits are categorized based on their sieve size.

Question 8

The maximum allowable noise level in a corn mill shall be ____.

Answer 8

92 db

Noise regulations are important for workplace safety.

Question 9

What is the ratio of the weight of milled rice to the total weight of paddy called?

Answer 9

Milling Recovery

This ratio is often expressed in percentage.

Question 10

Pieces of grains smaller than 75% of the average length of the whole grain are called?

Answer 10

Broken Grains

Broken grains affect the quality of the final product.

Question 11

Rice grain from which the hull, germ, and outer bran layer have been removed but may still have streaks of bran is called?

Answer 11

Undermilled rice

This classification indicates incomplete milling.

Question 12

Type of whitening machine consisting of a cylinder or cone coated with abrasive material is called?

Answer 12

Abrasive type

Abrasive machines are used in the whitening process to improve rice quality.

Question 13

Reduction of grain into meal or flour, including size reduction, is called?

Answer 13

Milling

Milling is a key process in food processing industries.

Question 14

What is the maximum temperature measured from the coconut oil expeller under Philippine Standard?

Answer 14

71 deg C

Maintaining the right temperature is crucial for oil extraction.

Question 15

What is the measure of the ability of the machine to remove the hulls?

Answer 15

Coefficient of hulling

This coefficient indicates the efficiency of hulling machines.

Question 16

A 1000 g grain sample produces 750 g milled rice, with 500 g being 6.4 mm long. What is the head rice percentage grain milling recovery?

Answer 16

75%

Head rice percentage is a critical quality metric in rice milling.

Question 17

What is the Jatropha cake production rate if 2.2 tons of dried Jatropha seeds produce 600 kg of crude oil in 4 hours?

Answer 17

700 kg/h

This calculation helps assess the efficiency of the oil extraction process.

Question 18

What is the ratio of the weight of grains with a size of three-fourths or more of the whole grain to the total weight of milled rice?

Answer 18

Percent head rice

This metric is essential for evaluating milling performance.

Question 19

The device of a rice mill that removes the remaining bran on the milled rice is called?

Answer 19

Polisher

Polishers enhance the appearance and quality of the rice.

Question 20

What is the minimum hulling efficiency of an impeller type rice mill for milled rice?

Answer 20

62%

Efficiency ratings are important for assessing machine performance.

Question 21

What type of micromill has an input capacity of 100-250 kg/h?

Answer 21

Household model

Household models are designed for small-scale processing.

Question 22

Dried coconut meat from which oil is extracted is called?

Answer 22

Copra

Copra is a primary raw material for coconut oil production.

Question 23

What is the classification system that indicates the uniformity of grind in the resultant product?

Answer 23

Fineness Modulus

This system helps in evaluating the consistency of ground materials.

Question 24

What is the minimum grinding recovery percentage for peanut grinder under Philippine standard?

Answer 24

96

Standards ensure quality and efficiency in food processing.

Question 25

What law states that energy required to reduce size of particle is proportional to the ratio of initial size to final size?

Answer 25

Kick's Law ## Footnote Kick's Law applies to the initial stages of size reduction processes.

Question 26

Who introduced the Bond’s Law of size reduction?

Answer 26

Frank Bond ## Footnote Bond's Law is widely used in the field of material processing.

Question 27

Rittinger’s Law was introduced by Peter Rittinger in what year?

Answer 27

1867 ## Footnote This law focuses on size reduction based on surface area.

Question 28

What is the average particle size for coffee grinder under Philippine standard?

Answer 28

1 mm ## Footnote Particle size affects brewing quality and flavor extraction.

Question 29

What is the overall heat transfer coefficient based on the inner surface area of the tube?

Answer 29

250 𝑊/ 𝑚2 ∙°𝐶 ## Footnote This value is crucial for calculating heat transfer rates in thermal systems.

Question 30

What is the specific heat of water used in the heat transfer calculations?

Answer 30

180 𝐽/ 𝑘𝑔∙°𝐶 ## Footnote This value is essential for determining the amount of heat absorbed or released by water.

Question 31

Using the LMTD method, what is the rate of heat transfer for the water?

Answer 31

498 kW ## Footnote This value indicates the total heat energy transferred to or from the water.

Question 32

What is the mass flow rate of water calculated in the scenario?

Answer 32

3.41 kg/s ## Footnote This measurement represents the amount of water flowing per second in the system.

Question 33

What is the heat transfer area on the inner side of the tube?

Answer 33

74 m² ## Footnote This area is critical for effective heat exchange between the fluids.

Question 34

What temperature does the steam in the condenser condense at?

Answer 34

50°C ## Footnote This temperature is crucial for understanding the heat exchange process in the condenser.

Question 35

What is the inlet temperature of the cooling water in the condenser?

Answer 35

10°C ## Footnote This temperature affects the overall heat transfer efficiency in the condenser.

Question 36

What is the outlet temperature of the cooling water in the condenser?

Answer 36

30°C ## Footnote This temperature is important for calculating the heat absorbed by the cooling water.

Question 37

What is the total length of the tube in the condenser?

Answer 37

720 m ## Footnote The length of the tube influences the overall heat exchange area.

Question 38

What is the diameter of the tube used in the condenser?

Answer 38

2 cm ## Footnote The diameter is relevant for calculating the flow characteristics and heat transfer areas.

Question 39

What is the overall heat transfer coefficient for the condenser?

Answer 39

2,100 𝑊/ 𝑚2 ∙°𝐶 ## Footnote A higher coefficient indicates a more efficient heat exchange process.

Question 40

What is the mass of the cooling water needed for an hour of operation?

Answer 40

122.58 tons ## Footnote This mass is derived from the heat transfer calculations and the specific heat of water.

Question 41

Fill in the blank: The one with the most votes will earn no point while the one with the least votes will receive a _______.

Answer 41

20-point bonus ## Footnote This rule adds a competitive element to the voting process.

Question 42

Who are the two competitors for Bryan’s heart?

Answer 42

Jan and Rey ## Footnote The competition is based on attractiveness as perceived by Bryan.