A. Maintaining high critical humidity
B. Maintaining low critical humidity
C. Coating the product with inert material
D. Both A. and C.
Related Mcqs:
- Powdery materials can be guarded against caking tendency on storage by___________________?
A. Providing irregular grain size
B. Providing minimum percentage of voids
C. Having maximum possible points of contact
D. None of these - Powdery materials can be guarded against caking tendency on storage by_________________?
A. Providing irregular grain size
B. Providing minimum percentage of voids
C. Having maximum possible points of contact
D. None of these - 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is________________________?
A. 0.4
B. 0.25
C. 0.2
D. 0.175 - In steam distillation, the _____________________?
A. Temperature is 100°C
B. Temperature is more than 100° C
C. Product must be immiscible with water
D. Temperature is higher than the boiling point of either component - With increase in temperature, the leaching rate increases because of the _____________________?
A. Increased diffusivity
B. Decreased viscosity of liquid
C. Both A. and B.
D. Neither A. nor B. - Leaching of coarse solid lumps is also termed as _____________________?
A. Decoction
B. Dissolution
C. Percolation
D. Agitation and settling - Steam distillation is not recommended to be used, if the _____________________?
A. Azeotropic mixture is to be separated and the final product is miscible with water
B. Liquids decompose, if distilled directly at atmospheric pressure
C. Material cannot be distilled by indirect heating even under low pressure, because of the high
boiling temperature
D. Material to be distilled is thermally unstable or has the tendency to react with other
components associated with it, at the boiling temperature - Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?
A. 2
B. 8
C. 12
D. 18 - During constant rate drying period, vaporisation rate per unit drying surface area _____________________?
A. Decreases with time
B. Increases with time
C. Does not change with time
D. Does not affect the moisture content of the wet solid - Penetration model (theory) for mass transfer was enunciated by _____________________?
A. Danckwerts
B. Toor and Marcello
C. Higbie
D. Kissinevskii
