Q.1
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using
Q.2
Pick out the wrong statement.
Q.3
Plate efficiency in a distillation column is reduced due to the __________ of liquid.
Q.4
Relative humidity is the ratio of the
Q.5
Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method?
Q.6
Absorption factor method is used to calculate the number of ideal stages, when
Q.7
During constant rate drying period, vaporisation rate per unit drying surface area
Q.8
During the constant rate period of drying of a solid,
Q.9
Inside the distillation column, the
Q.10
The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law.
Q.11
Leaching of coffee from coffee beans is done by
Q.12
The Hatta number is important in
Q.13
With increase in temperature, the rate of leaching increases, because the
Q.14
Stage efficiency in a leaching process depends on the
Q.15
Berl saddle made of carbon cannot be used for
Q.16
During constant rate period, the rate of drying decreases with the
Q.17
Drift in a cooling tower is
Q.18
Pick out the correct statement.
Q.19
Flooding in a column results due to
Q.20
The operating line for an absorber is curved, when plotted in terms of
Q.21
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
Q.22
Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?
Q.23
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:
(i) Reflux stream is completely liquid and is at its bubble point.
(ii) Reflux stream is below its bubble point.
Q.24
In the constant rate period of the rate of drying curve for batch drying,
Q.25
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.
Q.26
At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbant
Q.27
Leaching rate is independent of the
Q.28
Which of the following remains constant during sensible cooling process ?
Q.29
The cooling effect in a cooling tower can be speeded up by
Q.30
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).
Q.31
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is
Q.32
Sticky material can be dried in a __________ dryer.
Q.33
In steam distillation, the
Q.34
The commonly used solvent in supercritical extraction is
Q.35
Gaseous diffusion co-efficient increases with increase in the
Q.36
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas
Q.37
Which of the following has the same dimension as mass diffusivity?
Q.38
Priming in a distillation column
Q.39
A packed tower compared to a plate tower for a particular mass transfer operation
Q.40
An ideal tower packing should not
Q.41
Drying of refractory is normally carried out in a __________ dryer.
Q.42
Which of the following quantities need not be fixed before starting the design of a co-current absorber?
Q.43
Pick out the wrong statement.
Q.44
Stacked packing compared to dumped packing
Q.45
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
Q.46
In case of unsaturated air
Q.47
Water entrained by circulating air in cooling towers is termed as
Q.48
In saturated gas, the
Q.49
The Knudsen diffusivity is dependent on the
Q.50
Separation of the isotopes of helium for scientific investigations is done by
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