Drying Quiz 1

If the moisture content present in 100 kg of dry solid is 10 kg. Identify the moisture content in wet basis.

• 10/100

• 10/110

• 100/10

• 110/10

If the moisture content present in 100 kg of dry solid is 10 kg. Identify the moisture content in dry basis.

• 10/100

• 10/110

• 100/10

• 110/10

The moisture contained by a material in excess of the equilibrium moisture content

• Equilibrium moisture content

• Bound moisture content

• Free moisture content

• Unbound moisture content

Rate of drying curve is plotted under

• Equilibrium drying conditions

• Warming up drying conditions

• Constant drying conditions

• Constant moisture conditions

The conditions under which the temperature, humidity, velocity and direction of flow of the hot air or gas across the drying surface are constant during drying operation.

• Equilibrium drying conditions

• Constant drying conditions

• Constant velocity drying conditions

• Falling rate drying conditions

That part of the drying process during which the rate of drying varies with time and the instantaneous drying rate expressed as the amount of moisture evaporated per unit time per unit area of drying surface continuously decreases

• Warming up period

• Cooling down perion

• Constant rate drying period

• Falling rate drying period

In the graph above the segment BC represents

• Constant rate drying period

• Falling rate drying period

• Warming up period

• Second falling rate period

In the graph above the segment CD represents

• Saturate surface drying

• Unsaturated surface drying

• Internal movement of moisture controls

• Excess moisture controls

Identify all regions of a drying rate curve.

• Warming up period

• Constant rate period

• First falling rate period

• Second falling rate period

• None of the above

Define critical moisture content.

• It is the moisture content of a material at which the constant rate period ends and the falling rate period starts

• It is the moisture contained by a material in excess of the equilibrium moisture content

• It is the moisture content of a substance that is in equilibrium with its vapour in the gas phase under the specified humidity and temperature

• It is the moisture content in a material which exerts a vapour pressure less than that of the pure liquid at the same temperature.