drying

Which one of the following is pneumatic dryer

• drum dryer

• fluidized dryer

• freeze dryer

• spraydryer

Why direct heating by hot air can not be done in some cases

• The meterialcan degrade

• High temperature not required

• Low temperature not required

• Conduction gives best result

In a fluidized bed dryer prefiltering is included for filtering one of the following

• air

• fines

• moisture

• particles

Eutectic point is an important factor for one of the following drying process

• Drum drying

• fluidized bed drying

• Freeze drying

• Tray drying

High vacuum is applied in one of the following drying process

• Drum drying

• Freeze drying

• Spray drying

• Traydrying

Low temperaturedrying is obtained in one of the following drying process

• Drum drying

• Fluidised bed drying

• lyophillization

• Tray dring

Which one of the following is an example of static bed dryer

• Drum dryer

• Fluidized bed dryer

• Spray dryer

• Tray dryer

After critical moisture content ............... starts

• Saturated drying region

• Unsaturated drying region

• Constant drying region

• None of the mentioned

After the unsaturated drying completed ............ starts to evaporate

• Bound

• unbound

• Equilibrium

• None of the mentioned

Dryer must only eliminate the

• Water in material

• Water vapour

• Residual water

• All the above