Rubber Roll for Rice Mill PAES 214-215: 2004

Question 1

cylinder where rubber is bonded

Answer 1

metal drum core

Question 2

component of rice mill made of rubber bonded to an inner metal drum core use for hulling

Answer 2

rubber roll

Question 3

depth of the rubber bonded on the metal drum core

Answer 3

rubber thickness

Question 4

specified by the width, by the outside diameter and by the core diameter of the rubber roll

Answer 4

size

Question 5

longitudinal dimension of a roll in right angle to the diameter

Answer 5

width

Question 6

The rubber roll shall be classified as:

Answer 6

Centered , Off-centered

Question 7

The rubber shall have a minimum thickness of ___

Answer 7

15 mm

Question 8

The rubber hardness shall be between ___ shore in the case of elastomers and __ shore for press-cured rubber mixes.

Answer 8

80 shore to 90, 85

Question 9

When the rubber is subjected to heating test, the minimum value of hardness shall be ____ with maximum hardness drop of ___

Answer 9

70 shore, 10 shore

Question 10

The tensile stress of the rubber roll shall be ____.

Answer 10

6200 kPa to 8268 kPa.

Question 11

The specific gravity of the rubber shall be ____.

Answer 11

1.2 to 1.3.

Question 12

The modulus of elasticity of the rubber shall be ____.

Answer 12

482 kPa to 689 kPa.

Question 13

When the iron sheet is used for the drum core, it shall be at least ___ cold rolled carbon steel.

Answer 13

0.6 mm

Question 14

The rubber roll when tested in accordance with PAES 215 shall have hulling efficiency of at least ___.

Answer 14

80%.

Question 15

Rubber roll input capacity (Size mm x mm x mm , Input capacity kg/h )

Answer 15

64 x 152 x 60/73… 350 – 400

Question 16

Rubber roll input capacity (Size mm x mm x mm , Input capacity kg/h )

Answer 16

102 x 165/222… 450 – 700

Question 17

Rubber roll input capacity (Size mm x mm x mm , Input capacity kg/h )

Answer 17

152 x 222 x 174….. 850 – 1000

Question 18

Rubber roll input capacity (Size mm x mm x mm , Input capacity kg/h )

Answer 18

203 x 220/254….. 1100 – 1400

Question 19

Rubber roll input capacity (Size mm x mm x mm , Input capacity kg/h )

Answer 19

254 x 254 …..1700 - 2200

Question 20

For every ___ reduction in weight of the rubber roll, the brown rice processed shall be at least ___.

Answer 20

2 g , 60 kg.

Question 21

rice grain that breaks in the process of dehulling which has a size of less than eighth-tenth (8/10) of the average length of the whole grain

Answer 21

broken brown

Question 22

dehulled paddy with bran layer still intact

Answer 22

brown rice

Question 23

grain which show signs of fissures or fractures or splinters

Answer 23

cracked grain

Question 24

measure the ability of the huller to remove the hull

Answer 24

coefficient of hulling

Question 25

measure the ability of the huller to remove the hull without breaking the grain

Answer 25

coefficient of wholeness

Question 26

grain which is heat damaged, weather damaged, sprouted or distinctively damaged by insects, water, fungi, and/or any means

Answer 26

damaged grain

Question 27

all matters other than paddy such as sand, gravel, dirt, pebbles, stones, metal fillings, lumps of earth, clay, mud, chaff, straw, weed seeds and other crop seeds

Answer 27

foreign matter

Question 28

outermost rough covering of the palay grain (palea and lemma) consisting of the empty glumes, floral glumes, and awn

Answer 28

hull husk

Question 29

quantity of paddy that the huller can dehulled per total hulling time, expressed in kilogram per hour

Answer 29

hulling capacity

Question 30

product of the coefficient of hulling and coefficient of wholeness, expressed in percentage

Answer 30

hulling efficiency

Question 31

paddy which are light green and chalky with soft texture

Answer 31

immature grain

Question 32

amount of moisture in the grain expressed as percentage of the total mass of the sample (wet basis)

Answer 32

moisture content

Question 33

unhulled grain of Oryza sativa l., that is grain with hull enclosing the grain

Answer 33

paddy palay rough rice

Question 34

amount of rice grains free of foreign matter expressed as percentage of the total weight of the sample

Answer 34

purity

Question 35

or a fraction of grain with its length equal to or greater than eighth-tenth (8/10) of the average length of the whole grain

Answer 35

whole brown rice grain

Question 36

Moisture Content : dried to a uniform moisture content of

Answer 36

14 % + 1 %

Question 37

Purity :

Answer 37

98 %, minimum

Question 38

Type :

Answer 38

Long and slender grains

Question 39

This is carried out to obtain actual data on rubber roll performance, operating accuracy, work quality and adaptability to various paddy varieties for at least ___ of continuous operation or until there is a ___ reduction in the thickness of the rubber roll on test.

Answer 39

2 h, 50 %

Question 40

Start the test run and record the speed (rpm) of both rubber rolls with and without load. One roll should rotate ___ faster than the other.

Answer 40

25 %

Question 41

Clearance adjustment between the two hullers should be maintained at about __ the thickness of the paddy/rough rice. Adjust and record the clearance of the rubber rolls before and after each test trial.

Answer 41

½

Question 42

Record the changes in rubber roll dimension and weight every __ of continuous operation. Weigh and record the amount of paddy processed.

Answer 42

2 h