PROPERTIES OF AB MATERIALS (MODULE 2.2& 2.3)

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MIDTERM EXAMINATION VDC

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Grace Balahay

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PROPERTIES OF AB MATERIALS (MODULE 2.2& 2.3)


PROPERTIES OF AB MATERIALS (MODULE 2.2& 2.3)Version en ligne MIDTERM EXAMINATION VDC par Grace Balahay 1 Sharpness of the corners. Grains and Fruits and similar products Written answer 2 as a characteristic shape of a solid object relative to that of a sphere Written answer 3 separation of a mixture of various sizes of solid into two or more fractions by passing over a screen. Written answer 4 is a surface containing a number of equally size apertures. Written answer 5 the space between the individual wires of a wire mesh screen Written answer 6 number of wire per linear inch Written answer 7 the relationship between successively decreasing openings in a standard screen series. Written answer 8 This is widely used series based on a 200 mesh screen having 0.0021 in diameter wires and a screen aperture of 0.0029 in. diameter wires and a screen aperture of 0.0029 in. consecutive screens is (2)½ . Written answer 9 This screen series is based on B.S. 410: 1969 “Ten sieves”. A 170 mesh screen will have a nominal aperture size of 90 m and there is a screen interval of approximately (2)¼ between neighboring screens. Written answer 10 This series is based on an 18 mesh screen with a 1.0-mm aperture and a screen interval of (2)¼ standard sieve opening. Written answer 11 Mass or number fraction in each size increment is plotted as a function of average particle size Written answer 12 Individual increments are added starting with that containing the smallest particles. Plotting the cumulative sums against the maximum particle diameter in the increment. Written answer 13 It indicates the uniformity of grind in the resultant product. It is defined as the sum of the weight fractions retained above each sieve divided by 100. Written answer 14 It indicates the relative amounts of coarse, medium, and fine particles in a sample given in % Written answer 15 It is obtained by dividing each component value of the UI by 10. Each value should be rounded to the nearest whole number. The sum of the three numbers is always equal to 10 Written answer 16 It refers to the overall average size of the materials or grain expressed either in inches or millimeters Written answer 17 Porosity is determined from the difference of bulk volume of a piece of porous material and its volume after destruction of all voids by means of compression. (for soft material) Written answer 18 Porosity is determined from the microscopic view of a section of the porous medium. Written answer 19 Porosity can be measured directly by measuring the volume fraction of air using the air comparison pycnometer. Written answer 20 is the volume of the solid material (including water) excluding any interior pores that are filled with air. Written answer 21 is the volume of a substance including all pores within the material (internal pores). Written answer 22 is the volume of a material when packed or stacked in bulk. It includes all the pores enclosed within the material (internal pores) and also the void volume outside the boundary of individual particles when stacked in bulk (external pores). Written answer 23 depends on temperature and the temperature dependence of densities of major food components [pure water, carbohydrate (CHO), protein, fat, ash and ice] Written answer 24 It is the ratio of the volume fraction of the air or the void fraction in the sample Written answer 25 is an important physical property characterizing the texture and the quality of dry and intermediate moisture foods. Written answer 26 It is an important parameter in predicting diffusional properties of cellular foods. Written answer 27 Volume of ______ can be measured directly. Written answer 28 Volume of objects with _______ can be obtained by calculation from their characteristic dimensions. Written answer 29 Volume of _______ can be estimated experimentally and through image processing. Written answer 30 Gas displacement method measures the _______ of a material. Written answer 31 Calculation from the characteristic dimensions, solid and liquid displacement methods, and image analysis provides the Written answer 32 Direct measurement and, in some cases, calculation from the characteristic dimensions, provides the ________ of a material. Written answer 33 is decrease in volume of the food usually due to moisture loss during processing. Written answer 34 can be measured as the ratio of apparent volume at a given moisture content to the initial apparent volume of materials before processing Written answer

PROPERTIES OF AB MATERIALS (MODULE 2.2& 2.3)

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PROPERTIES OF AB MATERIALS (MODULE 2.2& 2.3)Version en ligne

par Grace Balahay

Sharpness of the corners. Grains and Fruits and similar products

as a characteristic shape of a solid object relative to that of a sphere

separation of a mixture of various sizes of solid into two or more fractions by passing over a screen.

is a surface containing a number of equally size apertures.

the space between the individual wires of a wire mesh screen

number of wire per linear inch

the relationship between successively decreasing openings in a standard screen series.

This is widely used series based on a 200 mesh screen having 0.0021 in diameter wires and a screen aperture of 0.0029 in. diameter wires and a screen aperture of 0.0029 in. consecutive screens is (2)½ .

This screen series is based on B.S. 410: 1969 “Ten sieves”. A 170 mesh screen will have a nominal aperture size of 90 m and there is a screen interval of approximately (2)¼ between neighboring screens.

This series is based on an 18 mesh screen with a 1.0-mm aperture and a screen interval of (2)¼ standard sieve opening.

Mass or number fraction in each size increment is plotted as a function of average particle size

Individual increments are added starting with that containing the smallest particles. Plotting the cumulative sums against the maximum particle diameter in the increment.

It indicates the uniformity of grind in the resultant product. It is defined as the sum of the weight fractions retained above each sieve divided by 100.

It indicates the relative amounts of coarse, medium, and fine particles in a sample given in %

It is obtained by dividing each component value of the UI by 10. Each value should be rounded to the nearest whole number. The sum of the three numbers is always equal to 10

It refers to the overall average size of the materials or grain expressed either in inches or millimeters

Porosity is determined from the difference of bulk volume of a piece of porous material and its volume after destruction of all voids by means of compression. (for soft material)

Porosity is determined from the microscopic view of a section of the porous medium.

Porosity can be measured directly by measuring the volume fraction of air using the air comparison pycnometer.

is the volume of the solid material (including water) excluding any interior pores that are filled with air.

is the volume of a substance including all pores within the material (internal pores).

is the volume of a material when packed or stacked in bulk. It includes all the pores enclosed within the material (internal pores) and also the void volume outside the boundary of individual particles when stacked in bulk (external pores).

depends on temperature and the temperature dependence of densities of major food components [pure water, carbohydrate (CHO), protein, fat, ash and ice]

It is the ratio of the volume fraction of the air or the void fraction in the sample

is an important physical property characterizing the texture and the quality of dry and intermediate moisture foods.

It is an important parameter in predicting diffusional properties of cellular foods.

Volume of ______ can be measured directly.

Volume of objects with _______ can be obtained by calculation from their characteristic dimensions.

Volume of _______ can be estimated experimentally and through image processing.

Gas displacement method measures the _______ of a material.

Calculation from the characteristic dimensions, solid and liquid displacement methods, and image analysis provides the

Direct measurement and, in some cases, calculation from the characteristic dimensions, provides the ________ of a material.

is decrease in volume of the food usually due to moisture loss during processing.

can be measured as the ratio of apparent volume at a given moisture content to the initial apparent volume of materials before processing