Q.1
Which of the following processes is not an example of adsorption applied to gaseous separations?
Q.2
If f is defined as above, then which of the following applies to a feed at dew point?
Q.3
The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
Q.4
Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?
Q.5
A coalescer in a mixer-settler liquid-liquid extraction coloumn
Q.6
Tower diameter may be decreased by
Q.7
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.
Q.8
Which of the following is a suitable absorbent for removal of H₂S from natural gas?
Q.9
Which of the following solutions will follow Raoult's law most closely?
Q.10
Design calculation for multiple component distillation is done by
Q.11
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)
Q.12
In batch distillation with constant reflux, overhead product composition __________ with time.
Q.13
Pick out the wrong statement.
Q.14
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?
Q.15
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
Q.16
Flash distillation is suitable for the separation of components
Q.17
Make up water is required in a cooling tower to replace the water lost by
Q.18
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,
Q.19
The most common packing used in industrial operations is __________ rings.
Q.20
Wetted wall tower experiment determines the
Q.21
Separation of __________ employs gaseous diffusion process.
Q.22
Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in
Q.23
Which of the following mixtures does not form an azeotrope at atmosheric pressure?
Q.24
Physical absorption is
Q.25
Pick out the wrong statement
Q.26
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is
Q.27
Which of the following is used for the concentration of rubber latex?
Q.28
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the
Q.29
Extraction of coffee from its seed is done by
Q.30
During drying of a solid, the critical moisture content increases with
Q.31
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.
Q.32
Plate efficiency
Q.33
Reboiler is considered as one theoretical plate, because
Q.34
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in
Q.35
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,
Q.36
The minimum number of theoretical plates is required for achieving a given separation in distillation column with
Q.37
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)
Q.38
Which of the following is not a batch drier?
Q.39
Separation of two or more components of a liquid solution can not be achieved by
Q.40
In stripping section of continuous distillation column, the
Q.41
In rectifying section of a continuous distillation column, the
Q.42
Ordinary diffusion process is also called __________ diffusion.
Q.43
Which of the following is not a continuous leaching equipment?
Q.44
The slope of 9-line is determined by the
Q.45
The falling rate period in the drying of a solid is characterised by
Q.46
With the lowering of equiliDrium pressure, at a given temperature, the amount of ad-sorbate on the adsorbent
Q.47
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the
Q.48
Which of the following operations does not involve leaching?
Q.49
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as
Q.50
In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.
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