Chapter 2 |Milling

Which method of size reduction involves the material being gripped between two surfaces and crushed by the application of pressure?

What is the main mechanism involved in cutting for size reduction?

In which method of size reduction do the surfaces move relative to each other, resulting in shear forces breaking the particles?

What are the basic parts that make up a mill according to the text?

Which method of size reduction involves the material being reduced to the desired size by passing it once through the mill?

What happens in the impact method of size reduction?

What is the mechanism of size reduction in a roller mill?

How are the rolls in a roller mill rotated?

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

What is the function of the screen in a hammer mill?

Which processing variable is important for hammer mills?

In a roller mill used for milling ointments, pastes, and suspensions, how are the rolls driven?

What is the primary mechanism by which the particle size is reduced in fluid-energy mills?

Why is air commonly used in fluid-energy mills?

What are two important machine-related factors mentioned for fluid energy mills?

In addition to the cost of the mill, what other factors should be considered when selecting fluid energy mills for production?

What drawback is associated with the potential build-up of compressed product in fluid-energy mills?

What justifies the high capital and running costs in the pharmaceutical industry related to fluid-energy mills?

What is the key factor in the operation of a ball mill?

What type of action is responsible for most size reduction in a ball mill at higher speeds?

What is the purpose of the coarse screen at the outlet of a ball mill?

Which of the following statements about hammer mills is true?

What is the advantage of a continuous ball mill over a batch-operated ball mill?

What is the purpose of the balls or pebbles in a ball mill?

What is the primary reason for recycling larger particles during milling?

Which factor determines the choice between wet and dry milling?

What is the typical lower limit for particle size achievable by wet grinding?

Which type of mill is typically used for wet grinding of pharmaceutical materials?

Which factor is NOT considered when selecting a mill for pharmaceutical materials?

What is the primary reason for considering dust control when selecting a mill?

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

Which processing variable is crucial for determining the particle size achieved in hammer mills?

What type of mill uses a combination of compression and shearing action for size reduction?

What is the primary mechanism involved in size reduction by cutting?

In which method of size reduction does the material experience shear forces due to the relative movement of surfaces?

In a roller mill used for milling ointments, pastes, and suspensions, what is the main method of size reduction?

What is the principle of operation in most mills dependent on?

Which factor plays a key role in determining the choice between wet and dry milling for pharmaceutical materials?

In open-circuit milling, how is the material reduced to the desired size?

What contributes significantly to the size reduction in a ball mill at higher speeds?

Which part of a mill delivers the material into the grinding mechanism?

What is the main action involved in the impact method of size reduction?

Which of the following is NOT a benefit of increasing the surface area of a material through milling?

Which of the following statements is TRUE regarding the mixing or blending of solid ingredients in pharmaceutical manufacturing?

Which of the following statements about the mechanism of size reduction in a ball mill is INCORRECT?

In the context of milling pharmaceutical materials, what is the primary reason for recycling larger particles?

Which of the following statements regarding the selection of a mill for pharmaceutical materials is INCORRECT?

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

What is the main factor that contributes to reducing the particle size in fluid-energy mills?

Why is air commonly used in fluid-energy mills for milling pharmaceuticals?

What is a significant drawback associated with the build-up of compressed product in fluid-energy mills?

Why might high capital and running costs be less of a concern in the pharmaceutical industry when using fluid-energy mills?

What plays a crucial role in selecting fluid energy mills for production, apart from the cost of the mill itself?

In fluid-energy mills, what is primarily responsible for reducing particle size apart from interparticular attrition?

What is the primary advantage of using a hammer mill for size reduction in the pharmaceutical industry?

Which statement best describes the relationship between hammer tip speed and particle size reduction in a hammer mill?

What is the primary reason for using a thicker screen in a hammer mill?

Which statement best describes the relationship between particle size and impact energy during milling?

Which of the following statements regarding the use of fluid-energy mills in the pharmaceutical industry is true?

Which factor is NOT mentioned in the text as important for selecting a mill for pharmaceutical materials?