Related Questions

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 drying period, vaporisation rate per unit drying surface area
A Decreases with time
B Increases with time
C Does not change with time
D Does not affect the moisture content of the wet solid
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
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
During the constant rate period of drying of a solid,
A Increased air humidity decreases the rate of drying
B Increasing the air temperature decreases the drying rate
C Surface evaporation of unbound moisture occurs
D None of these
A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
A v
B 2v
C 4v
D 8v
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.
A Unsaturated surface
B Constant rate
C Both A & B
D Neither A nor B
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?
A 0.5
B > 0.6
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is
A 0.2
B 0.4
C 0.6
D 0.8

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