pharmaceutical technology 4 Flashcard 2

Front

Which of the following factors contributes the most to energy loss during size reduction? Elastic deformation of particles, Heat and sound dissipation, Friction between particles, Crack initiation

Back

Heat and sound dissipation

Front

Which parameter has the greatest impact on the final particle size distribution in a ball mill? Options: Ball-to-powder weight ratio, Material density, Viscosity of the medium, Airflow rate

Back

Ball-to-powder weight ratio

Front

How does increasing the roller speed in a roller mill affect particle size?

Back

Leads to uncontrolled particle size variation

Front

Which of the following is NOT a contributing factor to percolation segregation? Differences in particle size, Air turbulence, Gravity-induced movement, Differences in particle density

Back

Air turbulence

Front

In elutriation, what determines the critical particle size that will remain suspended? Options: Surface roughness, Upward fluid velocity, Cohesion forces, Particle shape

Back

Upward fluid velocity

Front

What factor has the greatest impact on the efficiency of sedimentation-based size separation?

Back

Viscosity of the medium

Front

What is the primary mechanism of size reduction in a pin mill?

Back

Impact and shear

Front

The efficiency of a hammer mill decreases significantly when: The material contains excess moisture

Back

The material contains excess moisture

Front

Which material property most influences energy efficiency in size reduction? Options: Hardness, Brittleness, Viscosity, Cohesion

Back

Brittleness

Front

What is the effect of excessive residence time in a fluid energy mill?

Back

Increase in particle aggregation