Postest Mikromeritik

Factors affecting the sieving process, except

• sieving time or length

• sample mass

• vibration intensity

• sieve area

The following are weaknesses of the microscopy method, except

• Only two-dimensional particles

• Must be calculated (300 - 500) for good distribution

• A bit long and tiring

• Particles do not aggregate or agglomerate

An example of a pharmaceutical dispersion system with sieve numbers 325 – 140 is on

• Lower limit of sight, lower limit of sieving distance, fine powder distance

• Suspension, fine emulsion, bacteria, red blood granules (8µm)

• The upper limit of the smallest sieving distance (subsieve range), coarse emulsion particles, white blood granules (25µm), flocculated suspension particles

• Average granule size

Berikut yang bukan merupakan penggunaan mikroskopi optik yaitu

• Untuk pengukuran partikel 0,2 µm – 100 µm

• Persentase kumulatif bobot diplotkan pada skala probabilitas terhadap logaritma ukuran rata-rata aritmatik

• Hasilnya berupa jumlah partikel dalam tiap kelas, yang disebut frekuensi

• Suspensi ditaruh pada slide atau “ruled cell” dan diletakkan dibawah mikroskop

The particle size requirement can be determined by applying gravity

1) Can fall freely without resistance at a constant rate

2) The flow of the medium is laminar or streamline

3) Particles aggregate or agglomerate

4) There is no turbulence flow

The correct statement is the number:

• 1,2,3

• 1,2,4

• 2,3,4

• All choices are correct

A pharmacist is sifting a powder with sieve numbers 40, 60, 80, and 100 mesh. Which has the largest sieve holes?

• 40 mesh

• 60 mesh

• 80 mesh

• 100 mesh

The following are disadvantages of the microscopy method, except

• Must be calculated (300 - 500) for good distribution

• A bit long

• Exhausting

• Only three particle dimensions: length, width, and height.

All of the following are methods for determining particle size, except

• Microscopy method

• Sieving method

• Method of deposition (sedimentation)

• Method of determining the surface area of the particles.

Berikut ini merupakan faktor-faktor yang mempengaruhi pengayakan, kecuali

• Waktu dan lama pengayakan

• Intensitas Getaran

• Massa Sampel

• Ukuran Partikel

A sample has a particle size of 0.4 m. Which is the most appropriate method for measuring the particle size distribution of the sample?

• Sifting

• Optical microscope

• Precipitation

• Determination of particle volume