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WorksheetsDrying Week 4 Quiz for 27/3 Attendance
Total questions: 15
Worksheet time: 8mins
What is the primary objective of the drying process?
Increase moisture content in solids
Remove all or most liquids by supplying latent heat
Add organic solvents to solids
Decrease temperature of solids
Which type of water is mainly held in the voids of a solid and can be removed by drying?
Bound water
Adsorbed water
Free water
Capillary water
At 100% relative humidity, what type of water remains in the solid?
Bound water
Free water
Capillary water
None of the above
Which of the following dryers is NOT mentioned in the content?
Rotary dryer
Spray dryer
Drum dryer
Freeze dryer
In drying processes, the equilibrium moisture content of a solid exposed to moist air varies with:
Temperature
Pressure
Relative Humidity (RH)
Time
What does a psychrometric chart provide information on?
The rate of evaporation of water in solids
Properties of dry and moist air
Moisture content in liquids
Solubility of solids in water
What is the purpose of determining the moisture content of air in drying processes?
To calculate the amount of energy needed
To control the drying temperature
To predict the drying rate
To achieve the target moisture level in the final product
Which dryer is best suited for heat-sensitive biological products like vaccines?
Vacuum-shelf dryer
Spray dryer
Freeze dryer
Vacuum-rotary dryer
How does a vacuum-shelf dryer remove moisture from the product?
By blowing hot air
By applying vacuum to lower the boiling point
By freezing the product
By tumbling the product
What is a disadvantage of a vacuum-shelf dryer?
High cost
Case/surface hardening
Slow drying speed
Complex design
In a vacuum-rotary dryer, how is heat transferred to the solids?
By direct flame contact
Through a rotating double-cone drum with a heating jacket
By microwave radiation
By infrared heating
What is the purpose of atomization in a spray dryer?
To freeze the liquid
To break the liquid into small droplets for rapid drying
To increase viscosity
To separate solids from liquids
How long does a typical freeze-drying process take?
1-2 hours
4-6 hours
24-48 hours
5 minutes
What is removed during the primary drying phase in freeze drying?
Bound water
Unbound water
Solvents
Impurities
In a spray dryer, what controls the particle size of the final powder?
Temperature of the air
Type of atomizer
Color of the liquid
Humidity of the air
