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1/which of the following dryer involve movement of the solid particles ?

A- Tray dryer

B-freeze drryer

C- Moving bed dryer

D- B&C



2/Which of following flow pattern that produce by propeller with three blades?

A- Radial

B-Tangential

C- Axial

D- All of above



3/Which of following mixers represented the most suitable mixer of wet solids (large quantity ) ?

A- Zig zag

B-Sigma-Blade

C- double-cone

D-pipe tube


4/the most suitable mill to obtain free-flowing spherical dried particles:

A- Hammer mill

B- Ball mill at low speed operation

C- Cutter mill

D Colloidal mill



5/What is mechanism of particle size reduction by ball mill?

A- Impaction

B- Attrition

C- Compression

D- Impaction &Attrition



6/Calculate LOD if exactly 10 g of moist solid granules was dried by try dryer to dry

weight of 6 g?

A-0.4

B-0.67

C- 0.04

D- 0.067



7/Impeller is a continuous solid mixer.

A Truc

B- False



8/Mechanism of roller mill is impaction.

A- True

B- False



9/Spray dryer is example ofdryer.

A- Static bed

B- Moving bed

C Pneumatic

D- None of above



10/Scale of segregation is a measure of the variation in composition among the various portions of the mixtures.

A- True

B- False



11/When considering particle size reduction of a soft waxy substance such as 2 points stearic acid, which of the following statements is true?

A-Stearic acid is capable of absorbing large amounts of energy through elastic and plastic deformation and more easily reduced in size by lowering the temperature below the glass transition point of the material

B-Stearic acid is capable of absorbing large amounts of energy through elastic and plastic deformation

C-Stearic acid can be more easily reduced in size by lowering the temperature below the glass transition point of the material

D-Stearic acid can be more easily reduced in size by decreasing the moisture content of the material




12/Which of the following statements is incorrect in the case of milling drug powders?

Milling can result in changes to the bioavailability of a drug

A-Decreased surface area results in an increased dissolution rate

B-Increased particle size results in a decreased surface area

C-Milling can result in changes in polymorphic forms of a drug

D-Milling can result in degradation of thermolabile drugs



13/Hammer mill is a type of only wet mill.

A-False

B-True


14/The most suitable mill for fresh Siena leafs

A-Colloidal

B-Cutter

C-Hammer

D-Fluid energy



15/Which of the following mixer is a static solid mixer?

A- Fluid jet

B- Ribbon

C- Double cone

D- Barrel


16/Which of the following sttatements is (are) true regarding ribbon mixer?

A- is more likely to cause segregation than a tumbling mixer

B- is inefficient in mixing poorly flowing powders

C- is easy to clean

D- eliminates 'dead spots'


17/Paste can be successfully mixed by Fluid i jet mixer.

A- True

B- False


18/What is the most suitable mechanism of dissimilar liquids?

A- Convective

B- Laminar

C-A&B

D- None of above


19/Which of the following dryer is used for drying granular solids, as each particle is

urrounded by the drying gas?

A- Fluidized-Bed Systems

B- Static- bed dryer

C- Moving-bed dryer

D- None of above


20/Which of following dryer don't applying heat externally to a material?

A- Spray dryer

B- Tray dryer

C- Microwave dryer

D- Turbo tray dryer



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