Q.1
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when
Q.2
With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux
Q.3
For an absorber, both equilibrium and operating line will be straight for
Q.4
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )
Q.5
A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?
Q.6
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because
Q.7
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler
Q.8
Pick out the wrong statement.
Q.9
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
Q.10
For stripping of a gas in a counter current stripper, the operating line
Q.11
In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be
Q.12
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)
Q.13
Which of the following remains constant during evaporative cooling process with recirculated water supply?
Q.14
Which of the following increases during evaporative cooling process with recirculated water supply?
Q.15
(NRe . NSc) is termed in mass transfer operation as the __________ number.
Q.16
Detergent solution is dried to a powder in a
Q.17
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.
Q.18
Free flowing granular materials can be best dried in a __________ drier.
Q.19
Which of the following equipments is not used for liquid dispersion?
Q.20
Pick out the wrong statement pertaining to the cooling towers.
Q.21
Which of the following decreases during evaporative cooling process with recirculated water supply?
Q.22
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.
Q.23
With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)
Q.24
Tea percolation employs
Q.25
In McCabe-Thiele method, at infinite reflux ratio
Q.26
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.
Q.27
Rotary dryers cannot handle __________ materials.
Q.28
The unit of volumetric diffusivity is
Q.29
When an unsaturated air-water mixture is heated at constant pressure, then
Q.30
Pick out the wrong statement pertaining to leaching.
Q.31
For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.
Q.32
Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.
Q.33
Pick out the wrong statement.
Q.34
Large quantity of silica gel is normally dried in a __________ dryer.
Q.35
Refractory bricks are usually dried in a __________ dryer.
Q.36
Adsorption is an unit operation which generally involves __________ systems.
Q.37
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be
Q.38
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
Q.39
At minimum reflux ratio for a given separation
Q.40
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
Q.41
With increase in pressure, the relative volatility for a binary system
Q.42
Dimension of mass diffusivity is the same as that of
Q.43
Milk is dried usually in a __________ dryer.
Q.44
Molarity is defined as the number of gm moles of solute per __________ of solvent.
Q.45
Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
Q.46
The adiabatic saturation curve for a vapour-gas mixture is
Q.47
An azeotropic mixture is a __________ mixture.
Q.48
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.
Q.49
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
Q.50
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
0 h : 0 m : 1 s