The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to___________________?

Related Mcqs:

1. Black liquor is converted into white liquor by __________________________?

   A. Evaporation and burning the concentrate followed by causticisation of products
   B. Multi-effect evaporation only
   C. Selective liquid extraction
   D. Extractive distillation

2. Tall oil obtained as a by-product from the black liquor recovery is________________?

   A. A black, sticky & viscous liquid
   B. Used in the manufacture of greases, emulsions & soaps
   C. Composed mainly of rosin & fatty acids
   D. All A , B. & C.

3. The major constituent of black liquor generated during paper manufacture is sodium___________________?

   A. Sulphate
   B. Carbonate
   C. Hydroxide
   D. Bi-carbonate

4. In sulphate pulp manufacture, the pressure and temperature in the digestor is____________________?

   A. 10 atm., 800 °C
   B. 10 atm., 170-180°C
   C. 1 atm., 170 – 180°C
   D. 1 atm., 800°C

5. Which of the following is the main constituent of the mother liquor produced in salt industry ?

   A. Quick lime
   B. Glauber’s salt
   C. Salt petre
   D. Bromine

6. In Kraft process of paper manufacture, white cooking liquor consists of caustic soda________________?

   A. Sodium sulphide & sodium carbonate
   B. Sodium sulphite & sodium carbonate
   C. Sodium sulphite & sodium sulphide
   D. None of these

7. Bromides contained in hot mother liquor is treated with ______________ during manufacture of bromine from sea water ?

   A. SO3
   B. Cl2
   C. NH3
   D. SO2

8. Cooking liquor in case of sulphite process is _____________________?

   A. Sodium sulphite and sodium bisulphite
   B. Magnesium sulphite and free SO2 in acid medium
   C. Magnesium sulphate and magnesium bicarbonate
   D. None of these

9. Liquor poisoning generally occurs due to the presence of _________________ in it ?

   A. Ethyl alcohol
   B. Impurities
   C. Methyl alcohol
   D. Carbonic acid

10. Sizing material is incorporated in paper to___________________?

    A. Impart resistance to penetration by liquids
    B. Increase its thickness
    C. Increase its flexibility & opacity
    D. Increase its brightness