Pick out the wrong statement?

Related Mcqs:

1. Pick out the wrong statement ?

   A. Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure
   substance
   B. In case of gas absorption, HETP is equal to HTU, when both the operating line & the
   equilibrium lines are parallel
   C. Hatta number is important in case of gas absorption with chemical reaction
   D. In actual practice, absorption is an endothermic process, while stripping is an exothermic
   process

2. Pick out the wrong statement ?

   A. Mechanical agitation is required, if the system has low interfacial tension
   B. Sieve tray towers are generally used for systems having low interfacial tension
   C. When Henry’s law constant is very small, then the mass transfer rate is controlled by the gas
   film resistance
   D. Taylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar
   and turbulent layers

3. Pick out the wrong statement?

   A. Mass transfer co-efficient does not account for gas-liquid diffusion
   B. Diffusion co-efficient and mass transfer co-efficient are not same in any mass transfer
   operation
   C. Contacting cold vapor-gas mixture with hot liquid exemplifies humidification process
   D. Contacting cold liquid with warm vapor-gas mixture exemplifies dehumidification process

4. Pick out the wrong statement ?

   A. In solvent extraction, the distribution co-efficient should be as large as possible for solvent
   economy
   B. With increase in pressure, the solubility of gases in solvent increases at a fixed temperature
   C. Decrease in Murphree plate efficiency is an indication of entrainment in distillation column
   D. The capacity of a distillation column is maximum at total reflux

5. Pick out the wrong statement pertaining to the analogy between equations of heat and mass_________________?

   transfer operations.
   A. Sherwood number in mass transfer is analogous to Nusselt number in heat transfer
   B. Prandtl number in heat transfer is analogous to Schmidt number in mass transfer
   C. Reynolds number in mass transfer is analogous to Grashoff number in heat transfer
   D. Reynolds number remains the same in both heat and mass transfer

6. Pick out the wrong statement. Raoult’s law does not apply, when the______________________?

   A. Size of component molecules are not equal
   B. Attractive forces between like and unlike molecules in the solution are approximately equal
   C. Component molecules are non-polar
   D. Chemical combination or molecular association between unlike molecules takes place in the
   formation of solution

7. Pick out the wrong statement?

   A. Change in barometric pressure does not affect the relative humidity
   B. In case of a packed tower, the operating velocity is about half of the flooding velocity,
   generally
   C. ‘Elution’ means the desorption of the adsorbed solute by a solvent
   D. The equilibrium moisture content of the solid can be reduced by increasing the absolute
   humidity

8. Pick out the wrong statement?

   A. Packed towers are preferred for vacuum operation, because the pressure drop through the
   packing is less and they (packings) also lessen the possibility of tower wall collapse
   B. Packed towers are preferred over plate towers for handling corrosive and foamy liquids
   C. Diameter of randomly packed tower is normally more than 1.2 metres
   D. Due to uneven supply and improper distribution of liquid, problem of channelling, loading &
   flooding is generally encountered in packed towers

9. Pick out the wrong statement ?

   A. Cellulose acetate membranes are used in dialysis process
   B. Elutriation process refers to when the soluble material is largely concentrated on the surface of
   an insoluble solid and is simply washed off by the solvent
   C. ‘Cascade’ means a group of stages interconnected so that various streams flow from one to
   another
   D. Zirconia probe is used for the humidity measurement

10. Pick out the wrong statement?

    A. The operating line always lies above the equilibrium solubility curve in case of a single
    component absorber
    B. The operating line always lies below the equilibrium solubility curve in case of a single
    component stripper
    C. The operating pressure in solvent extraction system should be below vapor pressures of all
    components
    D. The solubility of a particular gas in ideal solution in any solvent is always the same