Related Questions

Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.
A Molal
B Relative
C Percentage
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
The percentage humidity is less than the relative humidity only at __________ percent humidity.
A Zero
B Hundred
C Both zero and hundred
D None of these
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
A Increases
B Decreases
C Does not affect
D Exponentially increases
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
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?
A Flow rate of inlet air
B Relative humidity of outlet air
C Humidity of inlet air
D Temperature of the solid
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.
A 100
B 0
C 50
D Between 0 and 100
Critical humidity of a solid salt means the humidity
A Above which it will always become damp
B Below which it will always stay dry
C Both A and B
D Above Which it will always become dry and below which it will always stay damp
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
A Mean radiant temperature
B Effective temperature
C Dew point temperature
D None of these

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