To remove all the moisture from a wet solid it requires exposure to _____________ air?

Related Mcqs:

1. 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

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. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant______________________?

   A. Humidity
   B. Velocity
   C. Temperature
   D. All A., B. & C.

4. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________?

   A. Humidity
   B. Velocity
   C. Temperature
   D. All A., B. & C.

5. 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)

6. 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

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

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

8. 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

9. The vapour pressure exerted by the moisture contained in a wet solid depends upon the____________________?

   A. Nature of the moisture
   B. Temperature
   C. Nature of the solid
   D. All A., B. and C.

10. If moisture content of solid on dry basis is X, then the same on wet basis is____________________?

    A. X/(X + 1)
    B. X/(1 – X)
    C. (1 + X)/X
    D. (1 – X)/X