Q.1
Steam distillation is used to
Q.2
For water-ethanol system, the minimum reflux ratio
Q.3
Channelling in a packed tower results from the
Q.4
Pick out the wrong statement. Generally for physical adsorption, a gas of
Q.5
Dew point of a gas-vapour mixture
Q.6
Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
Q.7
Overall efficiency of the distillation column is
Q.8
A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)
Q.9
The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.
Q.10
Which of the following equipments is not used for gas dispersion?
Q.11
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are
Q.12
__________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.
Q.13
In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
Q.14
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
Q.15
Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
Q.16
Which of the following equipments is not used in liquid-liquid extraction?
Q.17
Laboratory determination of the dif-fusivity of vapor is done by __________ method.
Q.18
'Absorption with chemical reaction' is involved in the removal of
Q.19
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.
Q.20
The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.
Q.21
In case of a desorber (stripper), the
Q.22
In case of an absorber, the operating
Q.23
The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is
Q.24
In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of
Q.25
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.
Q.26
With increase in temperature, the solubility of gases in liquids, at fixed pressure
Q.27
Dryer widely used in a textile industry is __________ dryer.
Q.28
Which of the following employs an accessory known as 'drift eliminator' ?
Q.29
Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
Q.30
Ponchan-Savarit method analyses the fractional equipment based on
Q.31
The solvent used in liquid extraction should not have high latent heat of vaporisation, because
Q.32
Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if
Q.33
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect
Q.34
The recovery of pencillin from the acidified fermentation broth is done by
Q.35
Powdery materials can be guarded against caking tendency on storage by
Q.36
Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn.
Q.37
If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)
Q.38
For absorbers, high pressure drop results in
Q.39
The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity Dsub>BA (for component B diffusing in A) for a binary mixture of
Q.40
Co-current absorbers are usually used when the gas to be dissolved in the liquid is
Q.41
The overall mass transfer co-efficient for the absorption of SO₂ in air with dilute NaOH solution can be increased substantially by
Q.42
Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be
Q.43
The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is
Q.44
When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.
Q.45
Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
Q.46
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.
Q.47
All moisture in a non-hygroscopic material is the __________ moisture.
Q.48
In physical terms, Schmidt number means
Q.49
The diffusion co-efficient in m² /s. of acetic acid in benzene (liquid in liquid) is
Q.50
The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.
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