Pharmacy Sciences Quiz

What is the basic idea behind the drum dryer method of drying?

• Immersing the drum into the slurry

• Pouring the slurry over the drum surface

• Spraying the slurry in fine droplets

• Heating the slurry to high temperatures

Which feeding method is used for heavy suspensions in the drum dryer?

• Top feeding

• Splash feeding

• Feeding under vacuum

• Dip feeding

What is the purpose of the cold air zone in the spray dryer?

• To increase the drying time

• To minimize the hot zone and prevent adherence of particles

• To cool down the product quickly

• To reduce the efficiency of the drying process

Which type of nozzle is used for spraying low viscous liquids in the spray dryer?

• Pneumatic nozzle

• Ultrasonic nozzle

• Centrifugal nozzle

• High-pressure nozzle

What is the main advantage of using freeze dryers for drying materials?

• Low initial and maintenance cost

• Quick drying process

• Prevention of aggregation during drying

• High hygroscopic nature of the product

What is the process of converting solid ice into vapor without passing through the liquid phase called?

• Sublimation

• Condensation

• Evaporation

• Melting

Which materials are typically dried using freeze dryers?

• Highly viscous liquids

• Heat-sensitive materials

• Inorganic compounds

• Solid metals

What is the function of the triple point in the freeze drying process?

• To ensure equilibrium of the three phases of water

• To maintain a constant temperature

• To increase the pressure inside the dryer

• To prevent sublimation

Which type of product is produced by the centrifugal nozzle in the spray dryer?

• Needle-shaped crystals

• Granular particles

• Hollow spheres

• Amorphous powder

What is the main disadvantage of using spray dryers for drying materials?

• High initial and maintenance cost

• Limited drying capacity

• Excessive foaming during the drying process

• Inability to dry heat-sensitive materials