Equilibrium-moisture curves of different solids ____________________ ?

Related Mcqs:

1. Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?

   A. Anthracite coal
   B. Rag paper
   C. Bamboo
   D. Inorganic solids

2. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?

   A. M(Xo – XF)
   B. M(Xo/XF)
   C. M ln(Xo/XF)
   D. MXo ln(Xo/XF)

3. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))_____________?

   A. M(Xo – XF)
   B. M(Xo/XF)
   C. M ln(Xo/XF)
   D. MXo ln(Xo/XF)

4. It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?

   A. 15 min
   B. 51 min
   C. 71 min
   D. 94 min

5. Moisture contained by a substance in excess of the equilibrium moisture is called the _______________ moisture?

   A. Unbound
   B. Free
   C. Critical
   D. Bound

6. Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively ?

   A. II, III
   B. II, IV
   C. IV, III
   D. IV, II

7. Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______________ moisture?

   A. Free
   B. Unbound
   C. Equilibrium
   D. Bound

8. Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the ___________________ moisture ?

   A. Unbound
   B. Critical
   C. Free
   D. Bound

9. Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the _______________ moisture?

   A. Bound
   B. Unbound
   C. Critical
   D. None of these

10. Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is_________________?

    A. Not possible in the second case unless vacuum is applied
    B. Not possible in the second case unless high pressure is applied
    C. More readily done in the second case compared to first one
    D. None of these