Related Questions

The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation
A Increases with pressure rise
B Decreases with increasing pressure
C Becomes zero at the critical point
D Both B & C
For water evaporating into usaturated air under adiabatic conditions and at constant pressure, the __________ remains constant throughout the period of vaporisation.
A Dry bulb temperature
B Wet bulb temperature
C Humidity
D Relative saturation
In the constant rate period of the rate of drying curve for batch drying,
A Cracks develop on the surface of the solid
B Rate of drying decreases abruptly
C Surface evaporation of unbound moisture occurs
D None of these
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )
A $$\sqrt {\text{T}} $$
B T
C T1.5
D T3
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
A Humidity
B Velocity
C Temperature
D All of the above
During constant rate period, the rate of drying decreases with the
A Decrease in air temperature
B Increase in air humidity
C Both A & B
D Neither A nor B
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 Remains same
D Increases linearly
Which of the following assumes constant molal vaporisation and overflow?
A McCabe-Thiele method
B Ponchan-Savarit method
C Enthalpy concentration method
D Plate absorption column
When vaporisation takes place directly at the heating surface, it is called
A Film boiling
B Nucleate boiling
C Vapour binding
D None of these
Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).
A Entropy
B Internal energy
C Enthalpy
D Gibbs free energy

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