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February 2019

With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ?

Mass Transfer /
With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ?

A. Increases
B. Decreases
C. Remain same
D. Increases linearly

With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ? Read More »

Mass Transfer

In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed____________________?

Mass Transfer /
In distillation where q is defined as the moles of liquid flow in the stripg section per mole of feed introduced, for saturated liquid feed____________________?

A. q > 1
B. q < 1
C. q = 1
D. q = 0

In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed____________________? Read More »

Mass Transfer

Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?

Mass Transfer /
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?

A. Lower than
B. Higher than
C. Same as
D. Either same or higher than

Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption? Read More »

Mass Transfer

In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?

Mass Transfer /
In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?

A. Greater than
B. Smaller than
C. Equal to
D. Either A., or B.; depends on the type of packing

In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing? Read More »

Mass Transfer

Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be__________________?

Mass Transfer /
Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be__________________?

A. Cooled
B. Humidified
C. Both A. & B.
D. Dehumidified

Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be__________________? Read More »

Mass Transfer