TEST 1

What it consists the drying of solids?
1. The elimination of moisture transfer of heat by convection, by conduction and radiation.
2. The elimination of moisture using chemical substances.
3. The elimination of moisture using another dry solid.
4. The elimination of moisture without heat transfer.
Mark the correct affirmation:
1. In the critical period ahead the drying rate is not constant.
2. In the critical period post the drying rate is constant.
3. In the critical period ahead the drying rate is constant.
4. In the critical period post drying rate corresponds to initial rate.
One type of dryer that work scan be continued:
1. Rotary dryer at atmospheric pressure or vacuum.
2. Tray dryer at atmospheric pressure or vacuum.
3. Spray dryer
4. Agitated batch dryer at atmospheric pressure or vacuum.
Mark the correct affirmation:
1. The critical period ahead was from a initial value of moisture until the critical moisture.
2. The critical period ahead was from a value of initial moisture until the balance moisture.
3. The critical period ahead was from a critical value of moisture up to a value of equilibrium moisture.
4. The critical period ahead was from a value of critical moisture to a final value of humidity.
What happens to the moisture of the solid with respect to time?
1. Increases gradually as the drying progresses.
2. The humidity is constant during the drying process.
3. The humidity decreases during the drying process.
4. The moisture of the solid during the drying process, increases and decreases on.
What behaviour is the absolute humidity of the air respect time?
1. The absolute humidity of the air must be decreasing as time passes.
2. The absolute humidity of the air must be increasing as time passes.
3. The absolute humidity of the air must be increased as the absolute humidity of air should be constant during the drying process.
4. The absolute humidity of the air must be zero during the drying process, as time passes.
When you finish the drying process?
1. When the outlet temperature of the air begins to decrease.
2. When the outlet temperature of the air begins to increase.
3. When the air humidity remained constant.
4. When the weight of the solid remained constant.

TEST 1

SOLID DRYER