Mass Transfer Quiz 10

1 / 50

**The efficiency of a plate column will be maximum, when the flow is ideal ___________ the plate?**

2 / 50

**The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the__________?**

3 / 50

**The equipment used in the extraction of highly corrosive radioactive liquids is_________?**

4 / 50

**The drying time between fixed moisture content within diffusion controlled ?falling rate period? is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?**

5 / 50

**The dew point of an unsaturated gas-vapor mixture does not depend upon the ______ of the mixture?**

6 / 50

**The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is__________?**

7 / 50

**The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture?**

8 / 50

**Steam distillation is used for separation of high boiling ______?**

9 / 50

**The critical moisture content in case of drying indicates the _________ rate period?**

10 / 50

**The expression, ln(F/W) = ?xF xW [dx/y* ? x)] is_______?**

11 / 50

**Swenson-Walker crystalliser is a ___________ unit ?**

12 / 50

**The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ?**

13 / 50

**Stefan?s law describes the mass transfer by_________?**

14 / 50

**The binary diffusivity in gases at atmospheric conditions is about _____?**

15 / 50

**Tea percolation employs______?**

16 / 50

**The binary diffusivity in gases and liquids vary respectively as__________?**

17 / 50

**Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the _________ temperature?**

18 / 50

**The drying time between fixed moisture contents within the ?constant rate period? is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?**

19 / 50

**Sticky material can be dried in a _________ dryer ?**

20 / 50

**The boiling points of pure components of a binary system _________ with increase in total pressure of the system ?**

21 / 50

**The cooling effect in a cooling tower can be speeded up by _________?**

22 / 50

**The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________?**

23 / 50

**Surface renewal model of mass transfer was enunciated by_____?**

24 / 50

**The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by ___________?**

25 / 50

**The critical moisture content in case of drying indicates the ________ rate period?**

26 / 50

**The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or ?outgassed? adsorbent to from a definite concentration of adsorbate is called its_______?**

27 / 50

**Steam distillation is used to___________?**

28 / 50

**The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is_____?**

29 / 50

**Stacked packing compared to dumped packing__________?**

30 / 50

**The ?shanks system? of leaching (i.e., counter-current multiple contact leaching) is used for______?**

31 / 50

**The dew point of a saturated gas phase equals the _________ temperature?**

32 / 50

**The cooling effect in a cooling tower cannot be increased by_______?**

33 / 50

**The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is_____?**

34 / 50

**The adiabatic saturation curve for a vapour-gas mixture is___________?**

35 / 50

**Steam distillation is not recommended to be used, if the _______?**

36 / 50

**The binary diffusivity in gases does not depend upon the _____?**

37 / 50

**The dimension of diffusivity is same as that of the___________? The dimension of diffusivity is same as that of the**

38 / 50

**The commonly used solvent in supercritical extraction is_______?**

39 / 50

**The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of_________?**

40 / 50

**The expression, y(1 ? x)/x(1 ? y) is for_______?**

41 / 50

**Steady state equimolal counter diffusion occurs in case of ______?**

42 / 50

**The diffusivity D. in a binary gas mixture is related to the temperature (T) as__________?**

43 / 50

**The drying time between fixed moisture content within diffusion controlled ?falling rate period? is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?**

44 / 50

**The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 ? PA2) is for_________?**

45 / 50

**The caking of crystals can be prevented by _______?**

46 / 50

**The equation, NA = (DAB . Pt /RTZ) (y1 ? y2) is for _________?**

47 / 50

**The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an _____?**

48 / 50

**Steady state equimolal counter diffusion is encountered in_______?**

49 / 50

**The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are ___________?**

50 / 50

**The diffusivity D. in a binary gas mixture is related to the pressure (P) as_____?**

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